oSIST prEN 13828:2023
(Main)Building valves - Manually operated copper alloy and stainless steel ball valves for potable water supply in buildings -Tests and requirements
Building valves - Manually operated copper alloy and stainless steel ball valves for potable water supply in buildings -Tests and requirements
This document applies primarily to copper alloy and stainless steel ball valves with dimensions DN 6 to DN 100, for installations in buildings for potable water supply up to PN16 and a maximum distribution temperature of 65 °C. Occasional excursions up to 90 °C are permitted for a period of 1 h maximum.
The ball valves are classified by their nominal pressure being either PN10 or PN16.
This document specifies:
- the requirements of the materials and the design of ball valves;
- the mechanical, hydraulic and acoustic requirements of ball valves;
- the test methods to verify the requirements of ball valves;
- the marking requirements of ball valves.
Gebäudearmaturen - Handbetätigte Kugelhähne aus Kupferlegierungen und nicht rostenden Stählen für Trinkwasseranlagen in Gebäuden - Prüfungen und Anforderungen
Diese Europäische Norm gilt vorwiegend für Kugelhähne aus Kupferlegierungen und Edelstahl der Nennweiten DN 6 bis DN 100 für Installationen zur Trinkwasserversorgung in Gebäuden bis PN16 und eine höchste Verteilungstemperatur von 65 °C. Zeitweilige Abweichungen bis 90 °C sind für die Dauer von höchstens 1 h zulässig.
Die Kugelhähne werden nach ihrem Nenndruck, entweder PN10 oder PN16, klassifiziert.
Diese Europäische Norm legt fest:
- die Anforderungen an die Werkstoffe und die Konstruktion von Kugelhähnen,
- die mechanischen und hydraulischen Anforderungen sowie die Anforderungen an das Geräuschverhalten von Kugelhähnen,
- die Prüfverfahren, mit denen die Erfüllung der Anforderungen an Kugelhähne nachgewiesen wird,
die Anforderungen an die Kennzeichnung von Kugelhähnen.
Robinetterie de bâtiment - Robinets d’arrêt à tournant sphérique actionnés à la main en alliage de cuivre et en acier inoxydable pour la distribution d’eau potable dans les bâtiments - Essais et exigences
Le présent document s’applique principalement aux robinets d’arrêt à tournant sphérique en alliage de cuivre et en acier inoxydable, de diamètre compris entre DN 6 et DN 100, destinés à être installés dans les bâtiments pour la distribution d’eau potable jusqu’à PN 16 et à une température maximale de distribution de 65 °C. Des écarts de température occasionnels jusqu’à 90 °C sont autorisés pendant une durée maximum de 1 h.
Les robinets d’arrêt à tournant sphérique sont classés selon leur pression nominale, à savoir PN 10 ou PN 16.
Le présent document spécifie :
- les exigences relatives aux matériaux et à la conception des robinets d’arrêt à tournant sphérique ;
- les exigences mécaniques, hydrauliques et acoustiques applicables aux robinets d’arrêt à tournant sphérique ;
- les méthodes d’essai permettant de vérifier le respect des exigences applicables aux robinets d’arrêt à tournant sphérique ;
- les exigences de marquage applicables aux robinets d’arrêt à tournant sphérique.
Ventili v stavbah - Ročni krogelni ventili iz bakrene zlitine in krogelni ventili iz nerjavnega jekla za oskrbo s pitno vodo v stavbah - Preskusi in zahteve
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 13828:2023
01-april-2023
Ventili v stavbah - Ročni krogelni ventili iz bakrene zlitine in krogelni ventili iz
nerjavnega jekla za oskrbo s pitno vodo v stavbah - Preskusi in zahteve
Building valves - Manually operated copper alloy and stainless steel ball valves for
potable water supply in buildings -Tests and requirements
Gebäudearmaturen - Handbetätigte Kugelhähne aus Kupferlegierungen und nicht
rostenden Stählen für Trinkwasseranlagen in Gebäuden - Prüfungen und Anforderungen
Robinetterie de bâtiment - Robinets d’arrêt à tournant sphérique actionnés à la main en
alliage de cuivre et en acier inoxydable pour la distribution d’eau potable dans les
bâtiments - Essais et exigences
Ta slovenski standard je istoveten z: prEN 13828
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
91.140.60 Sistemi za oskrbo z vodo Water supply systems
oSIST prEN 13828:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 13828:2023
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oSIST prEN 13828:2023
DRAFT
EUROPEAN STANDARD
prEN 13828
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2023
ICS 23.060.20 Will supersede EN 13828:2003
English Version
Building valves - Manually operated copper alloy and
stainless steel ball valves for potable water supply in
buildings - Tests and requirements
Robinetterie de bâtiment - Robinets d'arrêt à tournant Gebäudearmaturen - Handbetätigte Kugelhähne aus
sphérique actionnés à la main en alliage de cuivre et en Kupferlegierungen und nicht rostenden Stählen für
acier inoxydable pour la distribution d'eau potable Trinkwasseranlagen in Gebäuden - Prüfungen und
dans les bâtiments - Essais et exigences Anforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13828:2023 E
worldwide for CEN national Members.
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oSIST prEN 13828:2023
prEN 13828:2023 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Designation. 7
5 Design characteristics . 8
5.1 Materials . 8
5.1.1 General . 8
5.1.2 Body materials . 8
5.1.3 Corrosion resistance . 8
5.1.4 Anti corrosive layer of the ball . 8
5.2 Connection ends . 8
5.2.1 General . 8
5.2.2 Special cases .11
5.3 Operation .11
5.3.1 Closing direction .11
5.3.2 Operating devices .11
5.3.3 Connection between valve and actuator .11
5.4 Stops .11
5.5 Flow way area .12
5.5.1 Full bore .12
5.5.2 Reduced bore .12
5.6 Test and/or drainage points (design and position) .12
6 Performance characteristics .13
6.1 Test sequence .13
6.2 General .14
6.3 Operating torque .14
6.4 Resistance against torque .14
6.5 Resistance against bending .16
6.6 Torque test of the captive rotating nuts/tail pieces .18
6.7 Stop resistance .19
6.8 Leak-tightness .19
6.9 Hydraulic strength .20
6.10 Replenish of water stored in space between ball and body .20
6.11 Resistance against pressure jumps .21
6.12 Angular seal .23
7 Acoustic characteristics .23
7.1 General .23
7.2 Principle .23
7.3 Procedure.24
7.4 Determination of acoustic group .24
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8 Mechanical endurance characteristics . 24
8.1 Resistance against 90 °C water . 24
8.2 Mechanical endurance of the control device . 25
9 Marking . 27
Bibliography . 28
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oSIST prEN 13828:2023
prEN 13828:2023 (E)
European foreword
This document (prEN 13828:2023) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13828:2003.
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oSIST prEN 13828:2023
prEN 13828:2023 (E)
Introduction
With respect to potential adverse effects on the quality of water intended for human consumption, caused
by the product covered by this document:
— This document provides no information as to whether the product may be used without restriction
in any of the member states of the EU or EFTA;
— It should be noted that, while awaiting the adoption of the verifiable European criteria, existing
national regulations concerning the use and/or the characteristics of this product remain in force.
— The requirements with regard to the drinking water quality are specified in national regulations.
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oSIST prEN 13828:2023
prEN 13828:2023 (E)
1 Scope
This document applies primarily to copper alloy and stainless steel ball valves with dimensions DN 6 to
DN 100, for installations in buildings for potable water supply up to PN16 and a maximum distribution
temperature of 65 °C. Occasional excursions up to 90 °C are permitted for a period of 1 h maximum.
The ball valves are classified by their nominal pressure being either PN10 or PN16.
This document specifies:
— the requirements of the materials and the design of ball valves;
— the mechanical, hydraulic and acoustic requirements of ball valves;
— the test methods to verify the requirements of ball valves;
— the marking requirements of ball valves.
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 248, Sanitary tapware - General specification for electrodeposited coatings of Ni-Cr
EN 1254 (all parts), Copper and copper alloys - Plumbing fittings
EN ISO 3822-1, Acoustics - Laboratory tests on noise emission from appliances and equipment used in water
supply installations - Part 1: Method of measurement (ISO 3822-1)
EN ISO 3822-3, Acoustics - Laboratory tests on noise emission from appliances and equipment used in water
supply installations - Part 3: Mounting and operating conditions for in-line valves and appliances (ISO 3822-
3)
EN ISO 5211, Industrial valves - Part-turn actuator attachments (ISO 5211)
EN ISO 6509, Corrosion of metals and alloys - Determination of dezincification resistance of brass
(ISO 6509)
EN ISO 9227, Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227)
ISO 65, Carbon steel tubes suitable for screwing in accordance with ISO 7-1
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
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3.1
ball valves
valves in which a ball, operated manually or via an actuator, rotates around an axis perpendicular to at
least one of the directions of flow; the ball has a hole where in open position the water will flow through,
in a straight or angled line
Note 1 to entry: Ball valves have a normal operating position of either fully open or fully closed. Ball valves will be
opened or closed by a single turn through 90°.
Note 2 to entry: The following types are covered:
— straight pattern ball valves;
— angle pattern ball valves;
— three way valves (1 inlet, 2 outlets).
3.2
nominal size
DN
nominal size of the ball valves is related to the size of the connection ends
Note 1 to entry: See Table 1.
Note 2 to entry: For valves provided with connection ends in different sizes, the nominal size (DN) of the smallest
connection end is leading and determines the minimum bore of the ball (Table 2 and Table 3).
4 Designation
The designation of a ball valve comprises:
— Design of the body (straight, angled or three way);
— type and material;
— nominal size (DN);
— bore (full or reduced);
— nominal pressure (PN);
— end connections;
— acoustic group (if applicable);
— number of this document, i.e. prEN 13828.
EXAMPLE Straight pattern ball valve (S) of copper alloy, DN 25, PN 16, with threads Rp 1 on both sides,
acoustic group 1, according to prEN 13828.
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5 Design characteristics
5.1 Materials
5.1.1 General
All materials coming into contact with water intended for human consumption shall present no health
risk nor cause any change to the water in terms of quality, appearance, smell or taste.
NOTE It should be noted that while awaiting the adoption of verifiable European criteria for testing materials
in contact with water intended for human consumption, existing national regulations concerning the use and/or the
characteristics of these products remain in force.
5.1.2 Body materials
5.1.2.1 General
All parts of the body shall be made of a copper alloy or stainless steel.
5.1.2.2 Dezincification resistant copper alloy
Copper-zinc alloys containing more than 15 % zinc are subjected to dezincification when submitted to
water capable of dezincification. In the countries where the use of products made of dezincification
resistant materials is required, the materials used shall guarantee a dezincification depth less than
200 µm in any direction. For this purpose, materials shall be tested in accordance with EN ISO 6509 and
the product shall be marked in compliance with the indications according to Clause 9.
5.1.3 Corrosion resistance
The materials shall be corrosion resistant or protected against corrosion. The materials used shall not
have an adverse effect on each other.
When tested to the neutral salt spray (NSS) test according the EN ISO 9227 for a duration of (96 ± 1) h,
no corrosion which could impair the device’s operation shall be revealed by visual examination
(disregarding possible salt deposits). After the test, the valve shall not show any internal and/or external
leakage when being tested according 6.8.
5.1.4 Anti corrosive layer of the ball
Applied metallic anticorrosive protection layers shall fulfil the requirements of EN 248.
For this purpose, a separate ball shall be tested.
5.2 Connection ends
5.2.1 General
Connection ends shall comply with EN 1254 (all parts), with the exception of EN 1254-1 and EN 1254-5
(ends for capillary soldering or capillary brazing to copper tubes). Examples of connection ends are
defined in Table 1.
Valves with threaded connection ends shall have flats on the body which, when used for fitting, shall
accommodate commercially available tools.
The connection ends as applied shall be suitable (and approved as such) for the nominal pressure of the
valve.
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oSIST prEN 13828:2023
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Table 1 — End connections and nominal sizes (DN)
Dimen-
Type DN 6 DN 8 DN 10 DN 15 DN 20 DN 25 DN 32 DN 40 DN 50 DN 65 DN 80 DN 100
sion
R or
p
R or R or R or R or R or R or R or R or R or R or
Internal thread to
p p p p p p p p p p
R 7/8
R or R 2
A c
p c
R 1/8 R 1/4 R 3/8 R 1/2 R 3/4 R 1 1/4 R 1 1/2 R 2 1/2 R 3 R 4
EN 10226-1
c c c c c c c c c c
R or R 1
p c
External thread to
A R 1/8 R 1/4 R 3/8 R 1/2 R 3/4 R 1 R 1 1/4 R 1 1/2 R 2 R 2 1/2 R 3 R 4
EN10226-1
Internal thread to
A G 1/8 G 1/4 G 3/8 G 1/2 G 3/4 G 1 G 1 1/4 G 1 1/2 G 2 G 2 1/2 G 3 G 4
ISO 228-1
Union end
G 7/8
connections (nut) to A — G 3/8 G 1/2 G 3/4 G 1 1/4 G 1 1/2 G 2 G 2 1/2 — — —
G 1
ISO 228-1
external thread with
G 2 B
G 1 1/2 B
shoulder to A G 1/8 B G 1/4 B G 3/8 B G 1/2 B G 3/4B G 1 B G 1 1/4 B G 2 1/2 B G 3 B G 4 B
a
G 1 3/4 B
G 2 3/8 B
ISO 228-1
G 2 B
G 1 1/2 B
Flat faced external
A G 1/4 B G 3/8 B G 1/2 B G 3/4B G 1 B G 1 1/4 B G 2 1/2 B G 3 B G 3 1/2 B —
a
thread to ISO 228-1
G 1 3/4 B
G 2 3/8 B
Flat face for sealing
P ≥ 1 ≥ 1 ≥ 1,5 ≥ 1,7 ≥ 2 ≥ 2,2 ≥ 2,5 ≥ 2,5 ≥ 3 ≥ 3 ≥ 3 ≥ 3
purposes
Flanged connection
to ISO 7005-3
DN — — — 15 20 25 32 40 50 65 80 100
(EN 1092-1, -2
and -3)
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oSIST prEN 13828:2023
prEN 13828:2023 (E)
Dimen-
Type DN 6 DN 8 DN 10 DN 15 DN 20 DN 25 DN 32 DN 40 DN 50 DN 65 DN 80 DN 100
sion
Compression end for
copper pipe to A — 10 12 14/15/ 18 22 28 35 42 54 76,1 88,9 108
EN 1254-2
Polyethylene
pipe compression A — — — 20 25 32 40 50 63 75 90 110
joints to EN 1254-3
Press ends for
metallic tubes A — 10 12 14/15/ 18 22 28 35 42 54 76,1 88,9 108
EN 1254-7
Ends for use with
plastics and 12/14/
A /10 18/20 /25/26 /32 /40 /50 /63 /75 /90 /110 /—
multilayer pipes to 15/16
EN 1254-8
a
Although this dimension has not been included in the ISO 228-1 it is used to connect the ball valves to other standardized devices and appliances.
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5.2.2 Special cases
Ball valves intended to be used where dimensional interchangeability is not a requirement, can
incorporate other end connections provided that all other requirements of this document are satisfied.
The manufacturer’s literature and the installation instructions applied (if applicable) shall indicate
clearly that the ball valve is for special application.
5.3 Operation
5.3.1 Closing direction
Ball valves shall close in a clockwise direction. The rotation of the ball from open to close position shall
be 90°.
5.3.2 Operating devices
The ball valve is operated by applying a manual or mechanical force to the operating device, which can
be, for example:
— lever handle;
— “T” type handle;
— screw driver or key;
— hand wheel;
— gear operated device (e.g. handle or a hand wheel);
— actuator.
In case the operating device is detachable, the end of the operating stem shall be marked to indicate the
open and closed position.
There shall be no play in the fixing of the operation device. In case the operating device is detachable and
provided with a clamp fitting or click fitting, the pull-off strength shall be between 50 N and 200 N.
Ball valves furnished with a gear handle shall complete a turn of at least 270° to close the ball valve from
a completely open position.
Ball valves provided with an actuator shall have a provision for manual operation in case of an emergency.
5.3.3 Connection between valve and actuator
If applicable, the connection between valve and actuator shall comply with the relevant requirements of
EN ISO 5211.
5.4 Stops
Manually operated valves shall be provided with fixed, non-adjustable stops in the positions “open” and
“close”. A manual operating device shall be positioned:
— perpendicular to the direction of the flow for the “close” position;
— parallel to the direction of the flow for the “open” position.
When the operating device is a gear handle or hand wheel, the open and closed positions shall be clearly
indicated on the actuating mechanism.
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5.5 Flow way area
5.5.1 Full bore
A valve is designated as full bore when the cross sectional area of the water pathway throughout the valve
is not less than that of a circular section having a diameter as given in Table 2.
Table 2 — Full bore valves
DN 6 8 10 15 20 25 32 40 50 65 80 100
Minimum bore diameter of
circle equivalent for flow-way 5,4 7,5 9 13 19 24 30 38,5 49 63 75 98
area (mm)
5.5.2 Reduced bore
A valve is designated as reduced bore when the cross sectional area of the water pathway throughout the
valve is less than that of a circular section having an equivalent diameter as given in Table 2 but not less
than that as given in Table 3.
Table 3 — Reduced bore valves
DN 8 10 15 20 25 32 40 50 65 80 100
Minimum bore
diameter of circle
5,9 7,9 9,9 14,8 19,8 24,8 31,7 39,6 49,5 64,4 79,2
equivalent for flow-
way area (mm)
5.6 Test and/or drainage points (design and position)
Ball valve bodies may also include test and/or drain ports, not obstructed by internal parts and with a
plug on the outlet side to facilitate downstream draining in situ.
The ports shall be according to the specifications as shown in Figure 1 and Table 4.
2
The bore of the ports shall have over their full length a minimum cross-section of 12,56 mm , while the
smallest dimensions shall be at least 4 mm.
Figure 1 — Test and drain ports
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Table 4 — Dimensions of test and drain ports
a
a
Nominal size DN Thread size
mm
≤ 15 G1/8 or G1/4 > 6,5
15 < DN ≤ 50 G1/4 or G3/8 > 6,5
> 50 G3/8 or G1/2 > 13
a
Thread shall be in compliance with EN 1254-4.
6 Performance characteristics
6.1 Test sequence
The samples shall be subjected to the test sequence shown in Table 5.
Table 5 — Test sequence
Clause Sample 1 Sample 2 Sample 3 Sample 4
5.3 Operation X
5.4 Stops X
5.5 Ball bore X
5.6 Test and/or drainage points (design
X
and position)
6.12 Angular seal X
6.7 Stop resistance X
6.11 Resistance against pressure jumps X (open) X (closed)
6.9 Hydraulic strength X
5.1.3 Corrosion resistance X
6.8 Leak-tightness X X
6.3 Operating torque X
6.4 Resistance against torque X
(including 6.8)
6.5 Resistance against bending X
(including 6.8)
6.6 Torque test of the captive rotating
X
nuts/tail pieces
6.10 Replenish of water stored in space
X
between ball and body
8.1 Resistance against 90 °C water X
8.2 Mechanical endurance of the control
X
device
NOTE Acoustic testing will require three samples which can be different from the samples mentioned above.
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6.2 General
This clause describes the methods of the tests that shall be carried out to verify the performance
characteristics and specifies the requirements.
Unless specified otherwise, all tests shall be carried out at ambient temperatures with water with a
maximum temperature of 30 °C.
The torques and forces to be applied shall be within a positive 5 % tolerance of the specified values.
6.3 Operating torque
6.3.1 Apparatus
A test rig capable of supplying and maintaining the required pressures for the test duration and fixate the
valve under test.
6.3.2 Procedure
a) Carry out one preliminary cycle.
b) Store the valve in the fully open position at ambient temperature for 24 h.
c) Connect the valve to the test rig, vent the air from the sample and close the outlet.
d) Apply a pressure of (PN + 0,1) MPa [(PN + 1) bar] and maintain this pressure throughout the test.
e) Measure the torque while moving the valve, with a speed of rotation of (5 ± 1) rpm, from the fully
open position to the fully closed position.
f) Drain the amount of water necessary to allow the pressure at the outlet drop to atmospheric.
g) Measure the torque while moving the valve, with a speed of (5 ± 1) rpm, from the fully closed position
to the fully open position. The pressure in the valve will drop to atmospheric at this point.
6.3.3 Requirements
The measured operating torque shall not exceed the values given in Table 6.
Table 6 — Operating torque
DN 6 8 10 15 20 25 32 40 50 65 80 100
Operating torque (N·m) 4 4 5 6 8 10 15 20 28 35 45 65
6.4 Resistance against torque
6.4.1 Principle
The principle is to determine the integrity of the body and the resistance against torques to be applied to
the connection ends of valves provided with threaded end connection, not including union end
connections.
For this purpose, the valve is tested with a torque “MT ”, representing the installation conditions and a
1
torque “MT ” representing the conditions during service.
2
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prEN 13828:2023 (E)
6.4.2 Apparatus
A test rig as shown in Figure 2 capable of supplying and maintaining the required torque for the test
duration and fixate the valve under test.
Key
1 pipe clamp
2 test pressure
3 pipe 1
4 pipe 2
5 pipe support
Figure 2 — Example of test rig
The pipes for testing shall conform to ISO 65, medium series, and have length of 1 m.
6.4.3 Procedure
a) Screw pipe 1 with a torque, not exceeding the torque MT indicated in Table 7, into the valve. Clamp
1
pipe 1 at a distance equal to or greater than 2 DN from the valve.
If applicable, the largest connection shall be used for pipe 1.
b) Screw pipe 2 with a torque, not exceeding the torque MT indicated in Table 7, into the valve.
1
c) Support pipe 2 such that no bending moment is applied to the valve.
d) Apply the required torque MT in a clockwise direction, gradually within 5 s to pipe 2, and maintain
1
this torque for (10 + 1) s (see Table 7).
e) Apply, in anti-clockwise direction, gradually a torque to a value capable of unscrewing one of the
connections.
f) Apply the required torque MT in a clockwise direction, gradually within 5 s to pipe 2. Set the valve
2
in the “closed” position, apply a pressure of (PN + 0,1) MPa [(PN + 1) bar] and maintain this pressure
for the rest of the test. Maintain torque MT for 900 s (see Table 7).
2
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g) Measure, with the torque MT applied, the torque needed for moving the valve (operating torque),
2
with a speed of rotation of (5 ± 1) rpm, from the fully closed position to the fully open position and
back.
h) With the stress removed, check the valve visually for any deformation and measure the internal and
external leak-tightness according to 6.8.
Table 7 —Torque
DN 6 8 10 15 20 25 32 40 50 65 80 100
Torque MT (N·m) 15 20 35 75 100 125 160 200 250 300 370 465
1
Torque MT (N·m) 12 16 28 40 68 100 128 160 200 250 290 370
2
6.4.4 Requirements
During and after the test, the valve shall not show any visual, permanent deformation, cracking or failure.
After the test, the valve shall not show any internal and/or external leakage
...
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