FprEN ISO 5211
(Main)Industrial valves - Part-turn actuator attachments (ISO/FDIS 5211:2025)
Industrial valves - Part-turn actuator attachments (ISO/FDIS 5211:2025)
This document specifies requirements for the attachment of part-turn actuators, with or without gearboxes, to industrial valves.
The attachment of part-turn actuators to control valves in accordance with the requirements of this document is subject to an agreement between the supplier and the purchaser.
This document specifies:
— flange dimensions necessary for the attachment of part-turn actuators to industrial valves [see Figures 1 a) and 1 c)] or to intermediate supports [see Figures 1 b) and 1 d)];
— driving component dimensions of part-turn actuators necessary to attach them to the driven components;
— reference values for torques for interfaces and for couplings having the dimensions specified in this document.
The attachment of the intermediate support to the valve is out of the scope of this document.
Industriearmaturen - Anschlüsse von Schwenkantrieben (ISO/FDIS 5211:2025)
Robinetterie industrielle - Raccordement des actionneurs à fraction de tour (ISO/FDIS 5211:2025)
Le présent document spécifie les spécifications pour le raccordement des actionneurs à fraction de tour, avec ou sans réducteur, aux appareils de robinetterie industrielle.
Le raccordement des actionneurs à fraction de tour aux robinets de régulation conformément aux spécifications du présent document est soumis à accord entre le fournisseur et l'acheteur.
Le présent document spécifie:
— les dimensions des brides nécessaires pour le raccordement des actionneurs à fraction de tour aux appareils de robinetterie industrielle [voir Figures 1 a) et 1 c)] ou aux supports intermédiaires [voir Figures 1 b) et 1 d)];
— les dimensions des éléments d'entraînement des actionneurs à fraction de tour nécessaires pour les raccorder aux éléments entraînés;
— les valeurs de référence des couples pour les interfaces et les éléments d'accouplement dont les dimensions sont spécifiées dans le présent document.
Le raccordement du support intermédiaire à l'appareil de robinetterie ne relève pas du domaine d'application du présent document.
Industrijski ventili - Priključki zasučnih pogonov na ventilih (ISO/FDIS 5211:2025)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 5211:2025
01-april-2025
Industrijski ventili - Pritrditve zasučnih pogonov na ventilih (ISO/DIS 5211:2025)
Industrial valves - Part-turn actuator attachments (ISO/DIS 5211:2025)
Industriearmaturen - Anschlüsse von Schwenkantrieben (ISO/DIS 5211:2025)
Robinetterie industrielle - Raccordement des actionneurs à fraction de tour (ISO/DIS
5211:2025)
Ta slovenski standard je istoveten z: prEN ISO 5211
ICS:
23.060.01 Ventili na splošno Valves in general
oSIST prEN ISO 5211:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN ISO 5211:2025
oSIST prEN ISO 5211:2025
DRAFT
International
Standard
ISO/DIS 5211
ISO/TC 153
Industrial valves — Part-turn
Secretariat: AFNOR
actuator attachments
Voting begins on:
Robinetterie industrielle — Raccordement des actionneurs à
2025-02-21
fraction de tour
Voting terminates on:
ICS: 23.060.01 2025-05-16
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
Reference number
ISO/DIS 5211:2025(en)
oSIST prEN ISO 5211:2025
DRAFT
ISO/DIS 5211:2025(en)
International
Standard
ISO/DIS 5211
ISO/TC 153
Industrial valves — Part-turn
Secretariat: AFNOR
actuator attachments
Voting begins on:
Robinetterie industrielle — Raccordement des actionneurs à
fraction de tour
Voting terminates on:
ICS: 23.060.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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Published in Switzerland Reference number
ISO/DIS 5211:2025(en)
ii
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Maximum flange torques . 2
5 Flange dimensions . 2
6 Designation . 5
7 Dimensions and torques . 6
7.1 General .6
7.2 Drive by key(s) .6
7.3 Drive by parallel or diagonal square head .8
7.4 Drive by flat head .9
7.5 Drive by improved flat head .11
7.6 Drive by involute spline . 12
7.7 Drive by bi-square . 13
8 Position of driven components at interface below part-turn actuator . 14
8.1 Drive by key(s) .14
8.2 Drive by parallel or diagonal square head or bi-square .16
8.3 Drive by flat head .17
9 Dowel pins . 17
Annex A (informative) Explanation of calculations . 19
Annex B (normative) Dimensions of keys and keyways .21
Bibliography .27
iii
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 153, Valves, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 69, Industrial valves, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 5211:2023), which has been technically
revised.
The main changes are as follows:
— dimensions and tolerances for keys and keyways were added in a new Annex B;
— a reference to the new Annex B was added in 7.2;
— editorial changes were made.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
Introduction
The purpose of this document is to establish certain basic requirements for the attachment of part-turn
actuators, in order to define the interface between actuator and valve.
This document is, in general, considered in conjunction with the specific requirements which may be agreed
between the parties concerned.
NOTE 1 In this document, the term “valve” can also be understood to include “valve with an intermediate support”
[see Figure 1 b)].
NOTE 2 When a combination of a multi-turn actuator and separate part-turn gearbox is coupled to form a part-turn
1)
actuator, the multi-turn attachment to the gearbox is in accordance with ISO/DIS 5210:2025 , Figures 1 c) and 1 d). A
combination of a multi-turn actuator with integral part-turn gearbox supplied as a part-turn actuator is in accordance
with Figures 1a) and 1b).
a) Direct interface b) Intermediate sup- c) Direct interface d) Intermediate support
port interface (when combination of interface (when combina-
a multi-turn actuator tion of a multi-turn actua-
and a gearbox) tor and a gearbox)
Key
1 part-turn actuator 5 gearbox
2 interface (see this document) 6 interface (see ISO 5210)
3 valve 7 multi-turn actuator
4 intermediate support
Figure 1 — Interface between part-turn actuator and valve
1) Under preparation.
v
oSIST prEN ISO 5211:2025
oSIST prEN ISO 5211:2025
DRAFT International Standard ISO/DIS 5211:2025(en)
Industrial valves — Part-turn actuator attachments
1 Scope
This document specifies requirements for the attachment of part-turn actuators, with or without gearboxes,
to industrial valves.
The attachment of part-turn actuators to control valves in accordance with the requirements of this
document is subject to an agreement between the supplier and the purchaser.
This document specifies:
— flange dimensions necessary for the attachment of part-turn actuators to industrial valves [see
Figures 1 a) and 1 c)] or to intermediate supports [see Figures 1 b) and 1 d)];
— driving component dimensions of part-turn actuators necessary to attach them to the driven components;
— reference values for torques for interfaces and for couplings having the dimensions specified in this
document.
The attachment of the intermediate support to the valve is out of the scope of this document.
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.
ISO 273, Fasteners — Clearance holes for bolts and screws
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology 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
actuator
any device designed for attachment to a general-purpose industrial valve in order to provide for the
operation of the valve
Note 1 to entry: The device is designed to operate using motive energy which may be electrical, pneumatic, hydraulic,
manual, etc., or a combination of these. Movement is limited by travel, torque (3.5) and/or thrust.
3.2
multi-turn actuator
actuator (3.1) which transmits torque (3.5) to the valve for at least one revolution and may be capable of
withstanding thrust
Note 1 to entry: An actuator may be a combination of a multi-turn actuator and multi-turn gearbox (3.4).
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
3.3
part-turn actuator
actuator (3.1) which transmits torque (3.5) to the valve for a rotation of one revolution or less and does not
have to withstand axial thrust
Note 1 to entry: A part-turn actuator may be a combination of a multi-turn actuator (3.2) and part-turn gearbox (3.4).
3.4
gearbox
any mechanism designed to reduce the torque (3.5) required to operate a valve
3.5
torque
turning moment transmitted through the mounting flanges and connection components
Note 1 to entry: Torque is expressed in newton-metres.
4 Maximum flange torques
The flange torque shall comply with the values listed in Table 1 which represent the maximum torques
which can be transmitted through the mounting flange.
Table 1 — Maximum flange torque values
Maximum flange torque
Flange type
[Nm]
F03 32
F04 63
F05 125
F07 250
F10 500
F12 1 000
F14 2 000
F16 4 000
F25 8 000
F30 16 000
F35 32 000
F40 63 000
F48 125 000
F60 250 000
F80 500 000
F100 1 000 000
The values specified in Table 1 have been defined on the basis of bolts in tension only at a stress of 290 MPa
and a coefficient of friction of 0,2 between the mounting interface. All variations in these defined parameters
lead to variations of the transmittable torque values. See Annex A for more details on the calculation method.
The selection of flange types for a particular application should take into account the additional torques that
may be generated because of inertia or other factors.
5 Flange dimensions
Flanges for part-turn actuator attachments shall comply with the dimensions shown in Figure 2 and given in
Table 2. The method of attachment shall be by means of studs, screws or through bolting.
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
Holes for the studs, screws or bolts shall be equi-spaced and positioned off-centre (see Figure 3 and Table 3)
and shall conform to the requirements of ISO 273.
The flange on the valve shall have a recess corresponding to the diameter d . A spigot on the part-turn
actuator is optional.
The minimum values for dimension h shown in Table 2 apply to flanges having material of proof stress
R ≥ 200 MPa. The minimum values for dimension h applied to flanges having materials of proof stress
e 2
R ≤ 200 MPa shall be agreed between manufacturer and purchaser. The minimum values for dimension h
e 3
shall be at least 1 × d .
Dimension d has been based on providing sufficient landing for the nuts and bolt heads where applicable.
Such landing is defined as a radius from the bolt hole centre with the dimension (d − d ) / 2, and is a
1 3
minimum. The flange shape of both valve and actuator outside these areas of landing is left to the option of
the manufacturer.
The dimensions and bolting material are based on bolts in tension at a maximum stress of 290 MPa. On
agreement, between the manufacturer/supplier and purchaser, bolting material with different tensile
strength can be used, with no dimensional changes but with potential variation of the transmittable torque.
Above flange type F60 alternative dimensions and/or torque ratings may be used on agreement between
manufacturer/supplier and purchaser.
Figure 2 — Flange dimensions
Table 2 — Flange dimensions
Dimensions in millimetres
Flange Dimensions Number of
type screws, studs or
a b c d
d d d d d h h h h h
1 2 3 4 5 1 2 3 4 5
bolts
min. max. min. min. min. min.
n
F03 ∅46 ∅25 ∅36 M5 ∅5,5 3 8 5 6 5 4
F04 ∅54 ∅30 ∅42 M5 ∅5,5 3 8 5 6 5 4
F05 ∅65 ∅35 ∅50 M6 ∅6,6 3 9 6 6 6 4
F07 ∅90 ∅55 ∅70 M8 ∅9 3 12 8 8 8 4
F10 ∅125 ∅70 ∅102 M10 ∅11 3 15 10 10 10 4
F12 ∅150 ∅85 ∅125 M12 ∅13,5 3 18 12 14 12 4
a
d shall be manufactured within the diameter tolerance f8.
b
d clearance holes for bolts and screws according to ISO 273.
c
h based on ISO 4033 – Hexagon high nuts (style 2).
d
h based on 1,0 × d .
5 4
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
TTabablele 2 2 ((ccoonnttiinnueuedd))
Flange Dimensions Number of
type screws, studs or
a b c d
d d d d d h h h h h
1 2 3 4 5 1 2 3 4 5
bolts
min. max. min. min. min. min.
n
F14 ∅175 ∅100 ∅140 M16 ∅17,5 4 24 16 18 16 4
F16 ∅210 ∅130 ∅165 M20 ∅22 5 30 20 22 20 4
F25 ∅300 ∅200 ∅254 M16 ∅17,5 5 24 16 18 16 8
F30 ∅350 ∅230 ∅298 M20 ∅22 5 30 20 22 20 8
F35 ∅415 ∅260 ∅356 M30 ∅33 5 45 30 30 30 8
F40 ∅475 ∅300 ∅406 M36 ∅39 8 54 36 36 36 8
F48 ∅560 ∅370 ∅483 M36 ∅39 8 54 36 36 36 12
F60 ∅686 ∅470 ∅603 M36 ∅39 8 54 36 36 36 20
F80 ∅900 ∅670 ∅813 M42 ∅45 10 63 42 42 42 20
F100 ∅1 200 ∅870 ∅1 042 M42 ∅45 10 63 42 42 42 32
a
d shall be manufactured within the diameter tolerance f8.
b
d clearance holes for bolts and screws according to ISO 273.
c
h based on ISO 4033 – Hexagon high nuts (style 2).
d
h based on 1,0 × d .
5 4
Figure 3 — Position of holes
Table 3 — Position of holes
Flange type α/2
F03 to F16 45°
F25 to F40 22,5°
F48 15°
F60 to F80 9°
F100 5,625°
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
6 Designation
Part-turn valve actuator attachments shall be designated as follows:
— flange designation:
— flange type as per Table 1;
— a capital letter for spigot identification:
— Y with spigot;
— N without spigot;
— drive designation:
— an additional capital letter for drive identification:
— V for single-key drive;
— W for 90° two-key drive;
— X for 180° two-key drive;
— L for parallel square drive;
— D for diagonal square drive;
— H for flat head drive;
— G for improved flat head drive;
— S for involute spline;
— T for bi-square;
— the actual dimensions of the drive (in millimetres):
— dimension d for key drives (see Figure 4 and Table 4);
— dimension s for square or flat drives (see Figure 5 or 6 and Table 5 or Figure 7 and Table 6);
— module m for involute spline (see Figure 9 and Table 8).
EXAMPLE
ISO 5211 – F05 Y – V – 18, identifies a part-turn valve actuator attachment in accordance with this document,
with F05 flange type, spigot and single-key drive with 18 mm diameter.
NOTE The designation is not a marking requirement.
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
7 Dimensions and torques
7.1 General
To ensure that no interference can occur between the driving component and the driven component, the length
of the driven component above the interface shall be limited so that there is a clearance between both parts.
The depth of engagement of the valve driven component into the actuator drive component and the
surface area of contact between the faces of the actuator drive component and the faces of the valve driven
component should be considered to ensure that the stresses caused by contact do not exceed the capability
of the component materials. In some cases, it may be necessary to use materials with superior mechanical
properties and/or to reduce the output torque of the actuator.
7.2 Drive by key(s)
Dimensions of the drive components for key drive shall meet the requirements of Figure 4 and Table 4.
The values of d , h and l in Table 4 are based on single-key design up to 98 mm shaft diameter.
7 4 5
Where more than one key is required to transmit the torque, the dimensions in Table 4 shall still apply.
The key dimensions shall conform with those given in Annex B or any national standard.
The keyway(s) in the driving component shall correspond to the position of the key(s) supplied on the driven
component as specified in 8.1, Figures 11, 12 or 13.
The key(s) shall be secured in position by suitable means.
Key
1 interface
Figure 4 — Drive by key(s)
oSIST prEN ISO 5211:2025
ISO/DIS 5211:2025(en)
Table 4 — Dimensions and torques for drive by key(s)
Dimensions in millimetres
Max.
Flange flange h l
4 5 a, b, g
d
f 7
type torque max. min.
[Nm]
c
F05 125 3,0 30 ∅12 ∅14 ∅18 ∅22 — — — — — — — — — — — — — — — — —
c
F07 250 3,0 35 — ∅14 ∅18 ∅22 ∅28 — — — — — — — — — — — — — — — —
c
F10 500 3,0 45 — — ∅18 ∅22 ∅28 ∅36 ∅42 — — — — — — — — — — — — — —
c
F12 1 000 3,0 55 — — — ∅22 ∅28 ∅36 ∅42 ∅48 ∅50 — — — — — — — — — — — —
c
F14 2 000 5,0 65 — — — — ∅28 ∅36 ∅42 ∅48 ∅50 ∅60 — — — — — — — — — — —
c
F16 4 000 5,0 80 — — — — — ∅42 ∅48 ∅50 ∅60 ∅72 ∅80 — — — — — — — — —
c
F25 8 000 5,0 110 — — — — — — — ∅48 ∅50 ∅60 ∅72 ∅80 ∅98 ∅100 — — — — — — —
c
F30 16 000 5,0 130 — — — — — — — — — ∅60 ∅72 ∅80 ∅98 ∅100 ∅120 — — — — — —
F35 32 000 5,0 180 — — — — — — — — — — — — — — ∅160 — — — — —
F40 63 000 8,0 200 — — — — — — — — — — — — — — — — ∅180 — — — —
F48 125 000 8,0 250 — — — — — — — — — — — — — — — — — ∅220 — — —
F60 250 000 8,0 310 — — — — — — — — — — — — — — — — — ∅280 — —
F80 500 000 10 455 — — — — — — — — — — — — — — — — — — — ∅350 —
F100 1 000 000 10 655 — — — — — — — — — — — — — — — — — — — — ∅440
Max. transmissible torque
e e e e e e e e
32 63 125 250 500 1 000 1 500 2 000 3 000 4 000 8 000 12 000 16 000
d
Nm
a
For flange types F05 to F30, other dimensions of d between those indicated are permitted.
b
For flange types above F30, the given d values correspond to the maximum and any value up to this maximum is permitted, subject to considerations in footnote d.
c
Indicates the preferred dimension.
d
For flange types F05 to F30, these values are the corresponding torques which can be transmitted by the driving components having the d dimensions. They are based on a maximum allowable torsional stress of 280 MPa for
the driven component.
e
The maximum transmiss
...
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