Industrial valves - Actuators - Part 3: Pneumatic part-turn actuators for industrial valves - Basic requirements

This document specifies basic requirements for pneumatic part-turn valve actuators, both double acting and single acting, used for on-off and modulating control duties.
It includes guidelines, recommendations and methods for enclosure and corrosion protection, control and testing.
It does not apply to pneumatic actuators which are integral parts of control valves and to pneumatic actuators designed for permanent immersion in fresh or sea water.
Other requirements, or conditions of use, different from those indicated in this document, are expected to be subject to negotiations, between the purchaser and the manufacturer/supplier, prior to order.

Industriearmaturen - Antriebe - Teil 3: Pneumatische Schwenkantriebe für Industriearmaturen - Grundanforderungen

Dieses Dokument legt Grundanforderungen sowohl an in beide Richtungen als auch an in eine Richtung wirkende pneumatische Schwenkantriebe für Armaturen für Auf-Zu- und Modulations-Regelfunktionen fest.
Es enthält Leitlinien, Empfehlungen sowie Verfahren für Gehäuse- und Korrosionsschutz, Kontrollen und Prüfungen.
Es ist nicht anwendbar für pneumatische Stellantriebe, die integraler Bestandteil von Regelventilen sind, oder für pneumatische Stellantriebe, die für ständiges Eintauchen in Süß- oder Meerwasser ausgelegt sind.
Es wird erwartet, dass andere Anforderungen oder Anwendungsbedingungen als die, die in diesem Dokument angegebenen sind, vor Auftragserteilung zwischen dem Käufer und dem Hersteller/Lieferanten verhandelt werden.

Robinetterie industrielle - Actionneurs - Partie 3 : Actionneurs pneumatiques à fraction de tour pour robinetterie industrielle - Prescriptions de base

Le présent document spécifie les prescriptions de base pour les actionneurs pneumatiques à fraction de tour d’appareil de robinetterie à double et à simple effet, utilisés pour les fonctions tout ou rien et les fonctions de régulation.
Il comprend des lignes directrices, des recommandations et des méthodes pour la protection de l’enceinte et contre la corrosion, le contrôle et les essais.
Il ne s’applique pas aux actionneurs pneumatiques qui font partie intégrante de robinets de régulation, ni aux actionneurs pneumatiques, conçus pour une immersion permanente dans l’eau douce ou l’eau de mer.
Des prescriptions ou conditions relatives à l’utilisation, autres que celles mentionnées dans le présent document, sont prévues pour être négociées entre l’acheteur et le fabricant/fournisseur, avant la commande.

Industrijski ventili - Pogoni - 3. del: Pnevmatični pogoni z delnim zasukom za industrijske ventile - Osnovne zahteve

General Information

Status
Published
Publication Date
29-Apr-2023
Withdrawal Date
29-Apr-2023
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
23-Dec-2022
Completion Date
19-Oct-2022

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SLOVENSKI STANDARD
SIST EN 15714-3:2023
01-januar-2023
Nadomešča:
SIST EN 15714-3:2011
Industrijski ventili - Pogoni - 3. del: Pnevmatični pogoni z delnim zasukom za
industrijske ventile - Osnovne zahteve

Industrial valves - Actuators - Part 3: Pneumatic part-turn actuators for industrial valves -

Basic requirements
Industriearmaturen - Antriebe - Teil 3: Pneumatische Schwenkantriebe für
Industriearmaturen - Grundanforderungen

Robinetterie industrielle - Actionneurs - Partie 3 : Actionneurs pneumatiques à fraction de

tour pour robinetterie industrielle - Prescriptions de base
Ta slovenski standard je istoveten z: EN 15714-3:2022
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
SIST EN 15714-3:2023 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 15714-3:2023
---------------------- Page: 2 ----------------------
SIST EN 15714-3:2023
EN 15714-3
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 23.060.20 Supersedes EN 15714-3:2009
English Version
Industrial valves - Actuators - Part 3: Pneumatic part-turn
actuators for industrial valves - Basic requirements

Robinetterie industrielle - Actionneurs - Partie 3 : Industriearmaturen - Antriebe - Teil 3: Pneumatische

Actionneurs pneumatiques à fraction de tour pour Schwenkantriebe für Industriearmaturen -

robinetterie industrielle - Prescriptions de base Grundanforderungen
This European Standard was approved by CEN on 19 September 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15714-3:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
Contents Page

European foreword ............................................................................................................................................ 4

1 Scope .......................................................................................................................................................... 5

2 Normative references .......................................................................................................................... 5

3 Terms and definitions ......................................................................................................................... 5

4 Classification/Designation ................................................................................................................ 8

4.1 Duty classification ................................................................................................................................ 8

4.1.1 General...................................................................................................................................................... 8

4.1.2 On-off duty ............................................................................................................................................... 8

4.1.3 Modulating duty .................................................................................................................................... 8

4.2 Action ........................................................................................................................................................ 8

4.2.1 Double Acting (DA) ............................................................................................................................... 8

4.2.2 Single Acting (SA) .................................................................................................................................. 8

5 Motive energy ......................................................................................................................................... 8

5.1 Operating medium................................................................................................................................ 8

5.2 Quality ....................................................................................................................................................... 8

5.3 Pressure ................................................................................................................................................... 9

6 Actuator performance data ............................................................................................................... 9

6.1 Minimum moving pressure ............................................................................................................... 9

6.2 Operating time ....................................................................................................................................... 9

6.3 Displacement volume .......................................................................................................................... 9

7 Basic design requirements ................................................................................................................ 9

7.1 Safety requirements ............................................................................................................................ 9

7.2 Actuator attachment ............................................................................................................................ 9

7.3 Angular stroke ..................................................................................................................................... 10

7.4 Endurance of part-turn actuators ................................................................................................. 10

7.5 Leakage ................................................................................................................................................... 11

7.6 Environmental conditions ............................................................................................................... 11

7.6.1 Ambient temperature........................................................................................................................ 11

7.6.2 Enclosure protection ......................................................................................................................... 11

7.6.3 Corrosion protection ......................................................................................................................... 11

7.7 Pressure connections ........................................................................................................................ 12

7.7.1 General.................................................................................................................................................... 12

7.7.2 Remotely mounted pilot valves ..................................................................................................... 13

7.7.3 Direct mounted pilot valves ............................................................................................................ 14

7.8 Pressure connections for single acting actuators ................................................................... 15

7.9 Fail safe direction for single acting actuators .......................................................................... 15

7.10 Structural safety factors ................................................................................................................... 15

7.11 Position indication ............................................................................................................................. 16

8 Optional equipment ........................................................................................................................... 16

8.1 Ancillaries .............................................................................................................................................. 16

8.2 Manual operation ................................................................................................................................ 19

8.3 Mechanical end stop adjustment ................................................................................................... 19

9 Conformity assessment ..................................................................................................................... 19

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SIST EN 15714-3:2023
EN 15714-3:2022 (E)

9.1 General ................................................................................................................................................... 19

9.2 Type tests ............................................................................................................................................... 19

9.3 Control of production process ....................................................................................................... 20

10 Marking .................................................................................................................................................. 21

10.1 Basic requirements on marking .................................................................................................... 21

10.2 Optional information ........................................................................................................................ 22

11 Documentation .................................................................................................................................... 22

12 Part-turn actuator selection guidelines ..................................................................................... 22

Annex A (normative) Actuator type test procedure ............................................................................ 23

A.1 General ................................................................................................................................................... 23

A.2 Test equipment.................................................................................................................................... 23

A.3 Test conditions .................................................................................................................................... 23

A.4 Test procedure .................................................................................................................................... 23

A.4.1 Initial tests ............................................................................................................................................ 23

A.4.2 Endurance test ..................................................................................................................................... 24

A.4.3 Final tests............................................................................................................................................... 24

A.5 Acceptance criteria ............................................................................................................................ 24

Annex B (informative) Actuator selection guidelines ........................................................................ 25

B.1 General ................................................................................................................................................... 25

B.2 Selection parameters ........................................................................................................................ 25

B.2.1 General ................................................................................................................................................... 25

B.2.2 Valve questions ................................................................................................................................... 25

B.2.3 Actuator questions ............................................................................................................................. 25

B.2.4 Ancillary questions ............................................................................................................................ 26

B.2.5 Environmental conditions ............................................................................................................... 26

B.3 Actuator selection .............................................................................................................................. 26

B.3.1 General ................................................................................................................................................... 26

B.3.2 Torque characteristics for rack and pinion or vane actuators .......................................... 27

B.3.3 Torque characteristics for scotch yoke actuators (e.g. symmetric system) .................. 28

Bibliography ....................................................................................................................................................... 30

---------------------- Page: 5 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
European foreword

This document (EN 15714-3:2022) has been prepared by Technical Committee CEN/TC 69 “Industrial

valves”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by April 2023, and conflicting national standards shall be

withdrawn at the latest by April 2023.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 15714-3:2009.

In comparison with the previous edition, the following technical modifications have been made:

— addition of new terms and definitions;

— improvement of the classification and the designation with on-off and modulating duty classification;

— addition of a new Clause 5 on motive energy;
— enhancement of the basic design requirements;

— modification of the conformity assessment with type test indications and control of production

process.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United

Kingdom.
---------------------- Page: 6 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
1 Scope

This document specifies basic requirements for pneumatic part-turn valve actuators, both double acting

and single acting, used for on-off and modulating control duties.

It includes guidelines, recommendations and methods for enclosure and corrosion protection, control

and testing.

It does not apply to pneumatic actuators which are integral parts of control valves and to pneumatic

actuators designed for permanent immersion in fresh or sea water.

Other requirements, or conditions of use, different from those indicated in this document, are expected

to be subject to negotiations, between the purchaser and the manufacturer/supplier, prior to order.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN ISO 5211, Industrial valves - Part-turn actuator attachments (ISO 5211)
EN 12570, Industrial valves - Method for sizing the operating element
EN 15714-1, Industrial valves - Actuators - Part 1: Terminology and definitions
EN 60529, Degrees of protection provided by enclosures (IP Code)

ISO 5599-2, Pneumatic fluid power — Five-port directional control valves — Part 2: Mounting interface

surfaces with optional electrical connector
ISO 8573-1:2010, Compressed air — Part 1: Contaminants and purity classes
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 15714-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
part-turn actuator

actuator which transmits torque to the valve for less than one revolution; it does not have the capability

of withstanding axial thrust
Note 1 to entry: Part-turn actuators are classified by action and duty.
3.2
stroke
single and complete movement from one end of travel to the other
---------------------- Page: 7 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
3.3
end stop
mechanical part designed to stop the actuator drive train at an end position
Note 1 to entry: End stop can be fixed or adjustable.
3.4
torque
3.4.1
output torque

minimum guaranteed output torque capability of the actuator, in both directions, at specified supply

pressures conditions as provided by the manufacturer/supplier

Note 1 to entry: Where the output torque varies with the stroke, in a linear or nonlinear relationship with pressure,

tabulated data and/or torque versus stroke diagram shall be provided at significant pressure values for each

direction of movement.
3.4.2
rated torque

characterizing figure, indicated by the actuator manufacturer/supplier, used to specify the maximum

actuator operating torque

Note 1 to entry: The rated torque corresponds to the maximum torque value developed by the actuator when

powered with maximum allowable pressure.
3.4.3
nominal torque
3.4.3.1
double acting version

minimum guaranteed output torque of the actuator, at any point of the stroke, with nominal supply

pressure 0,55 MPa (5,5 bar)
3.4.3.2
single acting version

guaranteed output torque of the actuator with pneumatic nominal supply 0,55 MPa (5,5 bar) at the

beginning of the stroke in the direction to compress the spring
3.4.4
start torque

actuator output torque at the beginning of the stroke in the direction of movement

---------------------- Page: 8 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
3.4.5
maximum operating torque
MOT

for double acting version, output torque of the actuator when the pressure of the power supply

corresponds to the maximum allowable pressure; for single acting version the maximum output torque

between the torque at the beginning of the stroke when the pressure of the power supply corresponds to

the maximum allowable pressure and the torque generated by the spring at the end of specified

compression stroke

Note 1 to entry: The maximum torque value shall be indicated by the manufacturer/supplier; the value shall be not

lower than 1,45 times the nominal torque.
3.4.6
Air Starting Torque
AST

output torque, at specified pressure value, at the beginning of the stroke in opposition to the spring

3.4.7
Air Ending Torque
AET

output torque, at specified pressure value, at the end of the stroke when spring is at its maximum

compression
3.4.8
Air Running Torque
ART
any output torque value between AST and AET at specified pressure value
3.4.9
Spring Ending Torque
SET

output torque generated by the spring at the end of its stroke with no air in the cylinder

3.4.10
Spring Starting Torque
SST

output torque generated by the spring at its maximum compression with no air in the cylinder

3.4.11
Spring Running Torque
SRT
any output torque value between SST and SET
---------------------- Page: 9 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
4 Classification/Designation
4.1 Duty classification
4.1.1 General

According to their intended function, two versions of pneumatic part-turn valve actuators are specified

by this document: on-off duty and modulating duty.
4.1.2 On-off duty

The actuator is required to drive the valve through its entire travel from the fully open position to the

fully closed position or vice-versa.
4.1.3 Modulating duty

The actuator is required to continuously drive the valve to any position between fully open and fully

closed or vice.
4.2 Action
4.2.1 Double Acting (DA)

Actuator which requires the supply of motive energy to operate in both travel directions.

4.2.2 Single Acting (SA)

Actuator which requires external power to operate the valve in one direction only, the return stroke being

powered by an alternative form of stored energy (Fail-Safe actuators).

For the purpose of this document, the stored energy shall be supplied by a mechanical spring.

5 Motive energy
5.1 Operating medium

The operating medium shall be compressed air, unless otherwise specified. Other compressed gases may

be used, on agreement between the manufacturer/supplier and purchaser, ensuring they are compatible

with all the parts in contact with the fluid including the lubricants.
5.2 Quality

Humidity of the operating medium shall be Class 2 according to ISO 8573-1:2010, Table 2.

For ambient temperature conditions different from the standard stated at 7.6.1, the dew point shall be at

least 10 °C below the minimum operating ambient temperature.

It is recommended that the content of particles per cubic meter in the operating medium shall not exceed

Class 5 according to ISO 8573-1:2010, Table 1; particles up to a maximum 40 µm size are acceptable in

the operating medium provided that a right analysis of the behaviour of the ancillaries (8.1), when

mounted on the actuator, is done.
---------------------- Page: 10 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
5.3 Pressure
The manufacturer/supplier shall indicate the actuator’s pressure limits.

Unless otherwise specified the following values shall be considered within the scope of this document:

a) nominal supply pressure: 0,55 MPa (5,5 bar);
b) maximum allowable pressure shall be at least 0,8 MPa (8 bar);

c) design pressure for pressurized parts at least 1,1 times the maximum allowable pressure;

d) the minimum test pressure for pressurized parts shall be 1,5 times the design pressure.

6 Actuator performance data
6.1 Minimum moving pressure

For double acting actuators, the minimum moving pressure, at no load condition and ambient

temperature, shall be made available by the manufacturer/supplier upon request.

For single acting actuators, the minimum starting and release pressure in contrast to the spring at the

beginning and ending of the nominal stroke, at no load condition and ambient temperature, shall be made

available by manufacturer/supplier upon request.
6.2 Operating time

The actuator manufacturer/supplier shall state the minimum operating time in both directions, without

external load, at nominal pressure and without any significant external restriction on supply flow rate

and exhaust.
6.3 Displacement volume

The manufacturer/supplier shall state the internal actuator displaced volumes for each direction,

including the dead volumes, for the maximum stroke without any external limitation.

Displacement volume should be expressed in litres.
7 Basic design requirements
7.1 Safety requirements

Actuators shall be designed to take into account the technical principles and specifications for safety.

The design of spring return actuators shall permit the safe assembly/disassembly, when complying with

the manufacturer/supplier’s instructions.

Provisions shall be taken to avoid that the pressure within the spring enclosure exceeds 0,05 MPa

(0,50 bar) during the actuator operation if the spring is not located in a pressurized enclosure.

7.2 Actuator attachment
Attachment for part-turn actuators shall be as per EN ISO 5211.
---------------------- Page: 11 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
7.3 Angular stroke
Standard angular stroke for part-turn actuators shall be 90°.

For part-turn actuators, without adjustable end-stops, the standard tolerance on 90° angular stroke shall

be 0°/+2° for each end of stroke.

For part-turn actuators, with adjustable end-stop in one or both directions, the adjustment range referred

to 90° angular stroke shall be stated by the manufacturer/supplier but at least not less than ± 3° for each

end where adjustable stroke is provided.

Tolerances on adjustment for any other angular strokes, within the limit of one revolution, are subject to

agreement between the manufacturer/supplier and purchaser.
7.4 Endurance of part-turn actuators

The actuator shall be designed to guarantee a minimum endurance, without maintenance, in accordance

with values given in Table 1; minimum endurance shall be demonstrated by a suitable test.

For double acting actuators the endurance test shall be performed at a load, along the complete stroke,

of at least 60 % of the minimum run torque developed with 0,55 MPa (5,5 bar) nominal supply pressure.

For single acting actuators the endurance test shall be performed at a load, along the complete stroke, of

at least 60 % of the minimum value between the minimum air run torque at 0,55 MPa (5,5 bar) nominal

supply pressure and the minimum spring run torque.

Number of cycles and stroking time for the endurance test shall be selected from Table 1 considering the

range of rated torque (4.1) where the actuator under test falls.

Test endurance shall be performed in accordance with the procedure detailed in Annex A.

Table 1 — Endurance test parameters
Minimum number of Maximum stroking time for testing
Rated torque
based on 90° angular stroke
cycles
Nm s
≤ 125 500 000 3
> 125 to ≤ 1 000 250 000 5
> 1 000 to ≤ 2 000 100 000 8
> 2 000 to ≤ 8 000 50 000 12
> 8 000 to ≤ 16 000 25 000 15
> 16 000 to ≤ 32 000 12 500 20
> 32 000 to ≤ 63 000 5 000 30
> 63 000 to ≤ 125 000 3 200 45
> 125 000 to ≤ 250 000 1 600 60
Range of rated torques based on EN ISO 5211.

Number of cycles based on On-Off duty version; for On-Off duty version one cycle consists of

nominal 90° angular travel in both direction (i.e. 90° to open + 90° to close). For modulating control

duty version, the number of cycles, the angular travel and the moving speed for the endurance test

are agreed between the purchaser and manufacturer/supplier. For angular travel other than 90° the

endurance parameters are agreed between the purchaser and manufacturer/supplier.
---------------------- Page: 12 ----------------------
SIST EN 15714-3:2023
EN 15714-3:2022 (E)
7.5 Leakage

A leakage detection test shall be carried out on static condition, at both end of stroke for double acting

version and with spring compressed for single acting version, on the whole pressure retaining parts of

the actuator.

The test pressure value shall be at 1,1 times the maximum allowable pressure, with a minimum 0,55 MPa

(5,5 bar).
The minimum duration shall be:
a) 30 s for displacement volumes up to and including 10 l;
b) 60 s for displacement volumes up to and including 100 l;
c) 120 s for displacement volumes above 100 l.

The actuator shall have no visible or detectable external leakage for the duration of the test.

Specific procedure to perform this test, even with ancillaries if any, including the percentage of tested

units for mass production, shall be established by the manufacturer/supplier.

NOTE “No visible or detectable external leakage” means no weeping or formation of drops or bubbles within

the duration of the test. Other external leakage detection methods are qualified by the manufacturer's quality

system.
7.6 Environmental conditions
7.6.1 Ambient temperature

The actuator shall be designed for operation at an ambient temperature range between – 20°C and

+ 60°C, unless otherwise agreed between the manufacturer/supplier and purchaser.
7.6.2 Enclosure protection

The non-pressure retaining compartments of the actuator shall have a base degree of protection at least

IP 65 according to EN 60529 (excluding the exhaust port); for temporary immersion application the

degree of protection shall be at le
...

SLOVENSKI STANDARD
oSIST prEN 15714-3:2021
01-november-2021
Nadomešča:
SIST EN 15714-3:2011
Industrijski ventili - Pogoni - 3. del: Pnevmatični pogoni z delnim zasukom za
industrijske ventile - Osnovne zahteve

Industrial valves - Actuators - Part 3: Pneumatic part-turn actuators for industrial valves -

Basic requirements
Industriearmaturen - Antriebe - Teil 3: Pneumatische Schwenkantriebe für
Industriearmaturen - Grundanforderungen

Robinetterie industrielle - Actionneurs - Partie 3: Actionneurs pneumatiques à fraction de

tour pour robinetterie industrielle - Prescriptions de base
Ta slovenski standard je istoveten z: prEN 15714-3
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
oSIST prEN 15714-3:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 15714-3:2021
---------------------- Page: 2 ----------------------
oSIST prEN 15714-3:2021
DRAFT
EUROPEAN STANDARD
prEN 15714-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 23.060.20 Will supersede EN 15714-3:2009
English Version
Industrial valves - Actuators - Part 3: Pneumatic part-turn
actuators for industrial valves - Basic requirements

Robinetterie industrielle - Actionneurs - Partie 3: Industriearmaturen - Antriebe - Teil 3: Pneumatische

Actionneurs pneumatiques à fraction de tour pour Schwenkantriebe für Industriearmaturen -

robinetterie industrielle - Prescriptions de base Grundanforderungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 69.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15714-3:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 15714-3:2021
prEN 15714-3:2021 (E)
Contents Page

European foreword ............................................................................................................................................ 4

1 Scope .......................................................................................................................................................... 5

2 Normative references .......................................................................................................................... 5

3 Terms and definitions ......................................................................................................................... 5

4 Classification/Designation ................................................................................................................ 7

4.1 Duty classification ................................................................................................................................ 7

4.1.1 General...................................................................................................................................................... 7

4.1.2 On-off duty ............................................................................................................................................... 8

4.1.3 Modulating duty .................................................................................................................................... 8

4.2 Action ........................................................................................................................................................ 8

4.2.1 Double Acting (DA) ............................................................................................................................... 8

4.2.2 Single Acting (SA) .................................................................................................................................. 8

5 Motive energy ......................................................................................................................................... 8

5.1 Operating medium................................................................................................................................ 8

5.2 Quality ....................................................................................................................................................... 8

5.3 Pressure ................................................................................................................................................... 8

6 Actuator performance data ............................................................................................................... 9

6.1 Minimum moving pressure ............................................................................................................... 9

6.2 Operating time ....................................................................................................................................... 9

6.3 Displacement volume .......................................................................................................................... 9

7 Basic design requirements ................................................................................................................ 9

7.1 Safety requirements ............................................................................................................................ 9

7.2 Actuator attachment ............................................................................................................................ 9

7.3 Angular stroke ....................................................................................................................................... 9

7.4 Endurance of part-turn actuators ................................................................................................... 9

7.5 Leakage ................................................................................................................................................... 10

7.6 Environmental conditions ............................................................................................................... 11

7.6.1 Ambient temperature........................................................................................................................ 11

7.6.2 Enclosure protection ......................................................................................................................... 11

7.6.3 Corrosion protection ......................................................................................................................... 11

7.7 Pressure connections ........................................................................................................................ 12

7.7.1 General.................................................................................................................................................... 12

7.7.2 Remotely mounted pilot valves ..................................................................................................... 12

7.7.3 Direct mounted pilot valves ............................................................................................................ 13

7.8 Pressure connections for single acting actuators ................................................................... 14

7.9 Fail safe direction for single acting actuators .......................................................................... 14

7.10 Structural safety factors ................................................................................................................... 14

7.11 Position indication ............................................................................................................................. 15

8 Optional equipment ........................................................................................................................... 15

8.1 Ancillaries .............................................................................................................................................. 15

8.2 Manual operation ................................................................................................................................ 17

8.3 Mechanical end stop adjustment ................................................................................................... 18

9 Conformity assessment ..................................................................................................................... 18

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9.1 General ................................................................................................................................................... 18

9.2 Type tests ............................................................................................................................................... 18

9.3 Control of production process ....................................................................................................... 19

10 Marking .................................................................................................................................................. 20

10.1 Basic requirements on marking .................................................................................................... 20

10.2 Optional information ........................................................................................................................ 20

11 Documentation .................................................................................................................................... 21

12 Part-turn actuator selection guidelines ..................................................................................... 21

Annex A (normative) Actuator type test procedure ............................................................................ 22

Annex B (informative) Actuator selection guidelines ........................................................................ 24

Bibliography ....................................................................................................................................................... 28

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oSIST prEN 15714-3:2021
prEN 15714-3:2021 (E)
European foreword

This document (prEN 15714-3:2021) has been prepared by Technical Committee CEN/TC 69 “Industrial

valves”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15714-3:2009.

In comparison with the previous edition, the following technical modifications have been made:

— addition of new terms and definitions;

— improvement of the classification and the designation with on-off and modulating duty classification;

— addition of a new Clause 5 on motive energy;
— enhancement of the basic design requirements;

— modification of the conformity assessment with type test indications and control of production

process.
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1 Scope

This document provides basic requirements for pneumatic part-turn valve actuators, both double acting

and single acting, used for on-off and modulating control duties.

It includes guidelines, recommendations and methods for enclosure and corrosion protection, control

and testing.

It does not apply to pneumatic actuators which are integral parts of control valves and to pneumatic

actuators designed for permanent immersion in fresh or sea water.

Other requirements, or conditions of use, different from those indicated in this document, are expected

to be subject to negotiations, between the purchaser and the manufacturer/supplier, prior to order.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ASME B1.20.1, Pipe Threads, General Purpose (Inch)
EN ISO 5211, Industrial valves - Part-turn actuator attachments (ISO 5211)
EN 12570, Industrial valves — Method for sizing the operating element
EN 15714-1, Industrial valves - Actuators - Part 1: Terminology and definitions
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)

ISO 5599-2, Pneumatic fluid power — Five-port directional control valves — Part 2: Mounting interface

surfaces with optional electrical connector
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 15714-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
part-turn actuator

actuator which transmits torque to the valve for less than one revolution; it does not have the capability

of withstanding thrust
Note 1 to entry: Part-turn actuators are classified by action and duty.
3.2
stroke
single and complete movement from one end of travel to the other
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3.3
end stop
mechanical part designed to stop the actuator drive train at an end position
Note 1 to entry: End stop can be fixed or adjustable.
3.4
output torque

minimum guaranteed output torque capability of the actuator, in both directions, at specified supply

pressures conditions as provided by the manufacturer/supplier

Note 1 to entry: Where the output torque varies with the stroke, in a linear or nonlinear relationship with pressure,

tabulated data and/or torque versus stroke diagram shall be provided at significant pressure values for each

direction of movement.
3.4.1
rated torque

characterizing figure, indicated by the actuator manufacturer/supplier, used to define the maximum

actuator operating torque

Note 1 to entry: The rated torque corresponds to the maximum torque value developed by the actuator when

powered with maximum allowable pressure.
3.4.2 Nominal torque
3.4.2.1
double acting version

minimum guaranteed output torque of the actuator, at any point of the stroke, with nominal supply

pressure 0,55 MPa (5,5 bar)
3.4.2.2
single acting version

guaranteed output torque of the actuator with pneumatic nominal supply 0,55 MPa (5,5 bar) at the

beginning of the stroke in the direction to compress the spring
3.4.3
start torque

actuator output torque at the beginning of the stroke in the direction of movement

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3.4.4
maximum operating torque
MOT

for double acting version, output torque of the actuator when the pressure of the power supply

corresponds to the maximum allowable pressure; for single acting version the maximum output torque

between the torque at the beginning of the stroke when the pressure of the power supply corresponds to

the maximum allowable pressure and the torque generated by the spring at the end of specified

compression stroke

Note 1 to entry: The maximum torque value shall be indicated by the manufacturer/supplier; the value shall be not

lower than 1,45 times the nominal torque.
3.5.1
Air Starting Torque
AST

output torque, at defined pressure value, at the beginning of the stroke in opposition to the spring

3.5.2
Air Ending Torque
AET

output torque, at defined pressure value, at the end of the stroke when spring is at its maximum

compression
3.5.3
Air Running Torque
ART
any output torque value between AST and AET at defined pressure value
3.5.4
Spring Ending Torque
SET

output torque generated by the spring at the end of its stroke with no air in the cylinder

3.5.5
Spring Starting Torque
SST

output torque generated by the spring at its maximum compression with no air in the cylinder

3.5.6
Spring Running Torque
SRT
any output torque value between SST and SET
4 Classification/Designation
4.1 Duty classification
4.1.1 General

According to their intended function, two versions of linear valve actuators are defined by this document:

on-off duty and modulating duty.
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4.1.2 On-off duty

The actuator is required to drive the valve through its entire travel from the fully open position to the

fully closed position or vice-versa.
4.1.3 Modulating duty

The actuator is required to continuously drive the valve to any position between fully open and fully

closed or vice.
4.2 Action
4.2.1 Double Acting (DA)

Actuator which requires the supply of motive energy to operate in both travel directions.

4.2.2 Single Acting (SA)

Actuator which requires external power to operate the valve in one direction only, the return stroke being

powered by an alternative form of stored energy (Fail-Safe actuators).

For the purpose of this document, the stored energy shall be supplied by a mechanical spring.

5 Motive energy
5.1 Operating medium

The operating medium shall be compressed air, unless otherwise specified. Other compressed gases may

be used, on agreement between the manufacturer/supplier and purchaser, ensuring they are compatible

with all the parts in contact with the fluid including the lubricants.
5.2 Quality

Humidity of the operating medium shall be Class 2 according to ISO 8573-1:2010, Table 2.

For ambient temperature conditions different from the standard stated at 7.6.1, the dew point shall be at

least 10 °C below the minimum operating ambient temperature.

It is recommended that the content of particles per cubic meter in the operating medium shall not exceed

Class 5 according to ISO 8573-1:2010, Table 1; particles up to a maximum 40 µm size are acceptable in

the operating medium provided that a right analysis of the behaviour of the ancillaries (8.1), when

mounted on the actuator, is done.
5.3 Pressure
The manufacturer/supplier shall indicate the actuator’s pressure limits.

Unless otherwise specified the following values shall be considered within the scope of this document:

a) nominal supply pressure: 0,55 MPa (5,5 bar);
b) maximum allowable pressure shall be at least 0,8 MPa (8 bar);

c) design pressure for pressurized parts at least 1,1 times the maximum allowable pressure;

d) the minimum test pressure for pressurized parts shall be 1,50 times the design pressure.

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6 Actuator performance data
6.1 Minimum moving pressure

For double acting actuators, the minimum moving pressure, at no load condition and ambient

temperature, shall be made available by the manufacturer/supplier upon request.

For single acting actuators, the minimum starting and release pressure in contrast to the spring at the

beginning and ending of the nominal stroke, at no load condition and ambient temperature, shall be made

available by manufacturer/supplier upon request.
6.2 Operating time

The actuator manufacturer/supplier shall state the minimum operating time in both directions, without

external load, at nominal pressure and without any significant external restriction on supply flow rate

and exhaust.
6.3 Displacement volume

Internal actuator displaced volumes for each direction, including the dead volumes, for the maximum

stroke without any external limitation
Displacement volume should be expressed in litres.
7 Basic design requirements
7.1 Safety requirements

Actuators shall be designed to take into account the technical principles and specifications for safety.

The design of spring return actuators shall permit the safe assembly/disassembly, when complying with

the manufacturer/supplier’s instructions.

Provisions shall be taken to avoid that the pressure within the spring enclosure exceeds 0,05 MPa

(0,50 bar) during the actuator operation if the spring is not located in a pressurized enclosure.

7.2 Actuator attachment
Attachment for part-turn actuators as per EN ISO 5211.
7.3 Angular stroke
Standard angular stroke for part-turn actuators shall be 90°.

For part-turn actuators, without adjustable end-stops, the standard tolerance on 90° angular stroke shall

be 0°/+2° for each end of stroke.

For part-turn actuators, with adjustable end-stop in one or both directions, the adjustment range referred

to 90° angular stroke shall be stated by the manufacturer/supplier but at least not less than ± 3° for each

end where adjustable stroke is provided.

Tolerances on adjustment for any other angular strokes, within the limit of one revolution, are subject to

agreement between the manufacturer/supplier and purchaser.
7.4 Endurance of part-turn actuators

The actuator shall be designed to guarantee a minimum endurance, without maintenance, in accordance

with values given in Table 1; minimum endurance shall be demonstrated by a suitable test.

For double acting actuators the endurance test shall be performed at a load, along the complete stroke,

of at least 60 % of the minimum run torque developed with 0,55 MPa (5,5 bar) nominal supply pressure.

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For single acting actuators the endurance test shall be performed at a load, along the complete stroke, of

at least 60 % of the minimum value between the minimum air run torque at 0,55 MPa (5,5 bar) nominal

supply pressure and the minimum spring run torque.

Number of cycles and stroking time for the endurance test shall be selected from Table 1 considering the

range of rated torque (4.1) where the actuator under test falls.

Test endurance shall be performed in accordance with the procedure detailed in Annex A.

Table 1 — Endurance test parameters
Minimum number of Maximum stroking time (s) for
Rated torque (Nm)
testing based on 90° angular stroke
cycles
≤ 125 500 000 3
> 125 to ≤ 1 000 250 000 5
> 1 000 to ≤ 2 000 100 000 8
> 2 000 to ≤ 8 000 50 000 12
> 8 000 to ≤ 16 000 25 000 15
> 16 000 to ≤ 32 000 12 500 20
> 32 000 to ≤ 63 000 5 000 30
> 63 000 to ≤ 125 000 3 200 45
> 125 000 to ≤ 250 000 1 600 60
Range of rated torques based on EN ISO 5211.

Number of cycles based on On-Off duty version; for On-Off duty version one cycle consists of

nominal 90° angular travel in both direction (i.e. 90° to open + 90° to close). For Modulating

control duty version, the number of cycles, the angular travel and the moving speed for the

endurance test shall be agreed between the purchaser and manufacturer/supplier. For angular

travel other than 90° the endurance parameters shall be agreed between the purchaser and

manufacturer/supplier.
7.5 Leakage

A leakage detection test shall be carried out on static condition, at both end of stroke for double acting

version and with spring compressed for single acting version, on the whole pressure retaining parts of

the actuator.

The test pressure value shall be at 1,1 times the maximum allowable pressure, with a minimum 0,55 MPa

(5,5 bar).
The minimum duration shall be:
a) 30 s for displacement volumes up to and including 10 l;
b) 60 s for displacement volumes up to and including 100 l;
c) 120 s for displacement volumes above 100 l.

The actuator shall have no visible external leakage for the duration of the test.

Specific procedure to perform this test, even with ancillaries if any, including the percentage of tested

units for mass production, shall be established by the manufacturer/supplier.
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7.6 Environmental conditions
7.6.1 Ambient temperature

The actuator shall be designed for operation at an ambient temperature range between – 20°C and

+ 60°C, unless otherwise agreed between the manufacturer/supplier and purchaser.
7.6.2 Enclosure protection

The non-pressure retaining compartments of the actuator shall have a base degree of protection at least

IP 65 according to EN 60529 (excluding the exhaust port); for temporary immersion application the

degree of protection shall be at least IP 65/IP 68 according to EN 60529.
7.6.3 Corrosion protection

Actuators shall be protected against external corrosion by proper surface treatment and/or special

material selection. The actuator manufacturer/supplier shall specify in the technical documentation the

corrosion category, according to Table 2.
Table 2 — Environmental corrosion categories
Typical environments
Corrosion category
Exterior Interior
Atmospheres with low level of Unheated buildings where
C2 (low) pollution. Mostly rural areas. condensation could occur, e.g.
depots, sport halls.
Urban and industrial atmospheres, Production rooms with high
moderate sulphur dioxide pollution. humidity and some air pollution,
C3 (medium)
e.g. food-processing plants,
Coastal areas with low salinity.
laundries, breweries, diaries.
Industrial areas and coastal areas with Chemical plants, swimming pools,
C4 (high)
moderate salinity. coastal ship- and boatyards.
Industrial areas with high humidity and Buildings or areas with almost
C5 (very high) aggressive atmosphere and coastal permanent condensation and
areas with high salinity. with high pollution.
Offshore areas with high salinity and Industrial areas with extreme
industrial areas with extreme humidity humidity and aggressive
CX (extreme)
and aggressive atmosphere and atmosphere.
subtropical and tropical atmospheres.
Categories for water and soil
Category Examples of environments and structures
Im 1 (Immersed in River installations, hydro-electric power plants
fresh water)

Im 2 (Immersed in sea Immersed structures without cathodic protection (e.g. harbour areas with

or brackish water) structures luic gates, locks or jetties)
Im 3 (soil) Burried tanks, steel piles, steel pipes
Im 4 (Immersed in sea
Immersed structures without cathodic protection (off shore structures)
or brackish water)
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Table 5 is based on EN ISO 12944-2. The actuator corrosion protection may also be achieved by

systems/methods which deviate from those specified in EN ISO 12944-5.

Table 5 may be used to define the corrosion category in order to help the actuator manufacturers to

define the surface treatment for corrosion protection. Test assessment and test procedures are the

responsibility of the manufacturer.
7.7 Pressure connections
7.7.1 General

Unless otherwise specified the actuators shall have at least one pressure connection for each chamber of

cylinder, to supply or exhaust the pressure. For single acting versions one of the two connections is

considered the exhaust of the non-active chamber of cylinder.

Connections shall be clearly identified with numbers (2 and 4), in accordance with ISO 5599-2, or using

a manufacturer/supplier identification method clearly described in the installation instructions.

When pressurized, direction of movement shall be in accordance with Table 3, unless otherwise specified.

Table 3 — Identification of the pressure connections
Connection 2 (ISO 5599-2) Connection 4 (ISO 5599-2)
Direction of rotation (when
viewed from the top of the Counter-clockwise Clockwise
actuator interface)
7.7.2 Remotely mounted pilot valves

The recommended dimensions of the pressure connections are specified in Figure 1 and Table 4.

The position, orientation, dimension and form of the pressure connections shall be established by the

manufacturer/supplier and properly identified in the installation instructions.

The actuator shall be properly marked to indicate the form and dimension of thread.

Figure 1 — Dimensions of pressure connections for remotely mounted pilot valves
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prEN 15714-3:2021 (E)

Table 4 — Recommended dimensions of the pressure connections for remotely mounted pilot

valves
b c
Displacement
Diameter D4 (min
...

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