Standards Development

Scope

This document specifies design, type testing and marking requirements for:

a) cylinder valves intended to be fitted to refillable transportable gas cylinders;

b) main valves (excluding ball valves) for cylinder bundles;

c) cylinder valves or main valves with integrated pressure regulator (VIPR);

NOTE 1 This includes the following specific VIPR designs where:

1) the pressure regulating system of a VIPR is acting as the primary valve operating mechanism. This also includes designs where closure of the primary valve operating mechanism of a VIPR is obtained by closing the seat of the pressure regulating mechanism.;

2) the primary valve operating mechanism of a VIPR is located at the low pressure side of the pressure regulator or pressure reduction system.

d) valves for pressure drums and tubes; which convey compressed, liquefied or dissolved gases.

NOTE 2 Where there is no risk of ambiguity, cylinder valves, main valves, VIPR and valves for pressure drums and tubes are addressed with the collective term “valves” within this document. This document covers the function of a valve as a closure.

This document does not apply to

— valves for cryogenic equipment, portable fire extinguishers and liquefied petroleum gas (LPG), and — quick-release cylinder valves (e.g. for fire-extinguishing, explosion protection and rescue applications), self-closing cylinder valves or ball valves.

NOTE 3 Requirements for valves for cryogenic vessels are specified in ISO 21011 and at a regional level, e.g. in EN 1626. Requirements for LPG valves are specified in ISO 14245 or ISO 15995.

Requirements for quick-release cylinder valves are specified in ISO 17871. Requirements for selfclosing cylinder valves are specified in ISO 17879. Requirements for ball valves are specified in ISO 23826. Requirements for valves for portable fire extinguishers at a regional level are specified e.g. in EN 3 series.

NOTE 4 Requirements for manufacturing tests and examinations of valves covered by this document are given in ISO 14246.

NOTE 5 Certain specific requirements for VIPR in addition to those that are given in this document are specified in ISO 22435 for industrial applications or ISO 10524 3 for medical applications. Similarly, certain specific requirements for residual pressure valves with or without a non-return function in addition to those that are given in this document are given in ISO 15996.

NOTE 6 Certain specific requirements for valves for breathing apparatus in addition to those that are given in this document are specified at a regional level, e.g. in EN 144 series. 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.

NOTE 7 Additional requirements for pressure-relief devices can exist in international/regional regulations/standards.

Purpose

During the preparation of the revision of ISO 22435 it was noted that a clearer separation is necessary regarding which requirements are to be given in a closure standard (like ISO 10297) and which specific requirements are to be given in the VIPR standard ISO 22435. Such a restructuring will make both standards more user friendly because it will eliminate several instances of cross-referencing, and it will be a step forward in the direction of a possible harmonization of ISO 22435 as standard for industrials VIPR and ISO 10524-3 as standard for medical VIPR, thus also creating benefit for the users, the test houses and the manufacturers.

As a result, a revision of both standards, ISO 10297 and ISO 22435, was believed necessary. WG 6 unanimously agreed that the revision of both documents shall be performed in parallel. For both documents drafts were developed by WG 6, and it was also unanimously agreed by WG 6 that after successful adoptions as new work items both document should go immediately for CD ballot.

Consider the following: Is there a verified market need for the proposal? What problem does this standard solve? What value will the document bring to end-users? See Annex C of the ISO/IEC Directives part 1 for more information. See the following guidance on justification statements on ISO Connect:

https://connect.iso.org/pages/viewpage.action?pageId=27590861