FprEN ISO 23826

SLOVENSKI STANDARD
oSIST prEN ISO 23826:2021
01-marec-2021
Plinske jeklenke - Krogelni ventili - Specifikacija in preskušanje (ISO/DIS
23826:2021)
Gas cylinders - Ball valves - Specification and testing (ISO/DIS 23826:2021)
Gasflaschen - Kugelhähne - Spezifikation und Prüfungen (ISO/DIS 23826:2021)
Ta slovenski standard je istoveten z: prEN ISO 23826
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
oSIST prEN ISO 23826:2021 en,fr,de

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

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be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Valve description .................................................................................................................................................................................................. 4

5 Valve design requirements ........................................................................................................................................................................ 6

5.1 General ........................................................................................................................................................................................................... 6

5.2 Materials ....................................................................................................................................................................................................... 7

5.3 Valve connections ................................................................................................................................................................................. 7

5.4 Mechanical strength ........................................................................................................................................................................... 8

5.4.1 Resistance to hydraulic burst pressure ........................................................................................................ 8

5.4.2 Resistance to mechanical impact ....................................................................................................................... 8

5.5 Valve operating mechanism ......................................................................................................................................................... 8

5.6 Valve operating device ...................................................................................................................................................................... 9

5.7 Leakage .......................................................................................................................................................................................................... 9

5.8 Securing arrangements .................................................................................................................................................................... 9

5.9 Manufacturing tests and examinations ...........................................................................................................................10

6 Type testing.............................................................................................................................................................................................................10

6.1 General ........................................................................................................................................................................................................10

6.2 Documentation ....................................................................................................................................................................................12

6.3 Test samples ...........................................................................................................................................................................................12

6.4 Test report ................................................................................................................................................................................................13

6.5 Test temperatures .............................................................................................................................................................................13

6.6 Test pressures .......................................................................................................................................................................................13

6.6.1 Valve burst test pressure .......................................................................................................................................13

6.6.2 Valve test pressure ......................................................................................................................................................13

6.7 Test gases ..................................................................................................................................................................................................13

6.7.1 Gas quality ..........................................................................................................................................................................13

6.7.2 Leak tightness tests ....................................................................................................................................................14

6.7.3 Endurance tests .............................................................................................................................................................14

6.8 Test schedule .........................................................................................................................................................................................14

6.9 Hydraulic burst pressure test ..................................................................................................................................................15

6.10 Flame impingement test ..............................................................................................................................................................15

6.11 Excessive torque test ......................................................................................................................................................................15

6.12 Leak tightness test ............................................................................................................................................................................16

6.12.1 General...................................................................................................................................................................................16

6.12.2 Internal leak tightness test .................. .................................................................................................................16

6.12.3 External leak tightness test..................................................................................................................................17

6.13 Endurance test .....................................................................................................................................................................................17

6.14 Visual examination ...........................................................................................................................................................................18

7 Marking .......................................................................................................................................................................................................................18

8 Operating instructions ................................................................................................................................................................................19

Annex A (normative) Manufacturing tests and examinations ................................................................................................20

Annex B (normative) Endurance test machine .......................................................................................................................................21

Bibliography .............................................................................................................................................................................................................................23

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

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).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

Any trade name used in this document is information given for the convenience of users and does not

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/

This document was prepared by Technical Committee ISO/TC 58 Gas cylinders, Subcommittee SC 2,

Any feedback or questions on this document should be directed to the user’s national standards body. A

This document covers the function of a ball valve as a closure (defined by the UN Model Regulations).

Additional features of ball valves (e.g. pressure regulators, residual pressure devices, non-return

devices and pressure relief devices) might be covered by other standards and/or regulations.

Ball valves complying with this document can be expected to perform satisfactorily under normal

a) safety (mechanical strength, impact strength, endurance, leak tightness, resistance to acetylene

This document has been written so that it is suitable to be referenced on the UN Model Regulations

[1]. In this document the unit bar is used, due to its universal use in the field of technical gases. It

should, however, be noted that bar is not an SI unit, and that the corresponding SI unit for pressure is Pa

Pressure values given in this document are given as gauge pressure (pressure exceeding atmospheric

This document specifies design, type testing, marking and manufacturing test and examination

NOTE 1 In the course of the document, the term “valve” is used with the meaning of “ball valve”.

• toxic gases (i.e. gases listed in ISO 10298 having an LC value ≤ 5 000 ppm) and

NOTE 2 The reason for the exclusion of oxidizing gases is that the use of ball valves as closures of high

pressure cylinders for oxidizing gases is known to lead to specific ignition hazards that cannot reasonably be

mitigated through the ball valve design or type testing. Safety hazards concern both the ball valve itself and any

NOTE 3 The reason for the exclusion of acetylene for single gas cylinders, pressure drums and tubes is that the

risk of an acetylene decomposition cannot reasonably be mitigated through the ball valve design or type testing.

This document does not apply to ball valves for liquefied petroleum gas (LPG), cryogenic equipment,

NOTE 4 Requirements for valves for cryogenic vessels are specified in ISO 21011 and at a regional level,

e.g. in EN 1626. Requirements for valves for portable fire extinguishers at a regional level are specified e.g. in

NOTE 5 Certain specific requirements for quick-release valves for fixed fire-fighting systems in addition to

those that are given in this document are specified in ISO 16003 and at a regional level e.g. in EN 12094–4.

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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method

ISO 10156, Gas cylinders — Gases and gas mixtures — Determination of fire potential and oxidizing ability

ISO 10298, Gas cylinders — Gases and gas mixtures — Determination of toxicity for the selection of cylinder

ISO 10524-3, Pressure regulators for use with medical gases — Part 3: Pressure regulators integrated with

ISO 11114-1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1:

ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:

ISO 14246, Gas cylinders — Cylinder valves — Manufacturing tests and examinations

ISO 15615:2013, Gas welding equipment — Acetylene manifold systems for welding, cutting and allied

ISO 22435, Gas cylinders — Cylinder valves with integrated pressure regulators — Specification and

For the purposes of this document, the terms and definitions given in ISO 10286 and the following apply.

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

valve which uses the rotation of a ball with a through-passage to allow or shut-off flow through it

valve which is fitted to a cylinder bundle’s manifold isolating it from the main connection(s)

mechanism which rotates the ball and which includes external sealing systems and can

Note 1 to entry: Examples are stop pin and stop plate, mechanical stop in valve body and counterpart in

leak tightness to atmosphere (leakage in and/or leakage out) when the valve is open

leak tightness across the seat (leakage in and/or leakage out) when the valve is closed

settled pressure of a compressed gas at a uniform reference temperature of 15 °C in a full pressure

Note 1 to entry: This definition does not apply to liquefied gases (e.g. carbon dioxide), or dissolved gases (e.g.

lowest settled pressure of the gas(es) for which the ball valve is designed

torque applied to the valve operating device (3.4) in opening and closing direction which the valve

operating mechanism (3.3) and/or stop mechanism (3.5) can tolerate and remain operable

opening or closing torque (whichever is the lower value) applied to the valve operating device (3.4) at

Note 1 to entry: The valve filling connection can be different from the valve outlet connection.

normal temperature and pressure [20,0 °C (293,15 K), 1,013 bar absolute (0,101 3 MPa absolute)]

NOTE 1 The relevant transport regulation can require or forbid pressure relief devices for some gases,

gas mixtures or gas groups. Additional requirements for pressure-relief devices can exist in international/

NOTE 3 Requirements for pressure regulating devices are given in ISO 22435 for industrial applications

Valves shall operate within specification and be leak tight over a range of service temperatures, from at

Closed valves shall be internally leak tight during transport and storage (see test 6 in Table 3) for

Where higher or lower service temperatures are required, any additional requirements and tests shall

For ball valves used in liquefied gas service, a cavity relief system (e.g. a vent through the ball) is

required to prevent trapping of the gas within the ball cavity in the closed condition.

For ball valves with multiple ports, the relevant requirements according to Clause 5 shall be fulfilled for

For ball valves where anti-static and fire safe behaviour is of importance, examples of respective

Metallic and non-metallic materials in contact with the gas shall be chemically and physically compatible

with the gas, according to ISO 11114-1 and ISO 11114-2 under all intended operating conditions. For

all valves, the compatibility of the lubricant(s) and glue(s), if used in gas wetted areas, shall also be

considered. For valves used for dissolved gases, the compatibility of the materials in contact with the

solvent shall also be considered. For valves used with gas mixtures, the compatibility of the gas wetted

When using plated or coated components in gas wetted areas the material compatibility of both

the plating/coating material and the substrate material shall be taken into account. In addition,

consideration should be given to avoid separation of the surface coating or particle generation.

a) a material not showing a ductile to brittle transition (examples of allowed materials are copper

b) a ferritic material (e.g. carbon steel) having an impact value greater than 27 J at −40 °C when

Valve inlet and outlet connections shall conform to an International Standard, other regional or national

standards or proprietary designs that have been qualified to an acceptable industry standard.

NOTE 1 Valve inlet connection standards are for example ISO 11363-1, ISO 15245-1, ISO 228, ISO 6162-1,

NOTE 2 International valve outlet connection standards are for example ISO 5145, ISO 10692-1, ISO 228–1,

ISO 6162-1, ISO 6162-2, ISO 11926-1 and ANSI/ASME B1.20.1. A partial compilation of regional and national

NOTE 3 Qualification procedures for proprietary valve inlet connection designs are for example given in

NOTE 4 Qualification procedures for proprietary valve outlet connection designs are for example given in

If the valve filling connection is separate to the valve outlet connection and not equipped with a closure

device (non-return valve or isolating valve), it shall be provided with a pressure-tight device (e.g. a plug

or cap which can be operated or removed only by the use of a special proprietary tool provided by

the manufacturer). Where applicable, such a pressure-tight device shall be designed to vent gas before

The valve filling connection closure device, if fitted, shall comply with the relevant endurance and

subsequent leakage requirements of ISO 22435 for industrial applications or ISO 10524-3 for medical

Valves shall withstand p (see 6.6.1) without permanent visible deformation or burst.

This document does not include a test to validate that the valve is inherently able to withstand damage

from impact without release of the contents. It is recommended that ball valves are protected during

NOTE Applicable transport regulations normally specify the variety of acceptable means. Main valves used

5.5.1 The valve operating mechanism shall meet the requirements of 5.5.2 to 5.5.5.