ISO/FDIS 22435

This document specifies design, type test methods, marking and instruction requirements for cylinder valves with integrated pressure regulators (VIPRs) intended to be fitted to gas cylinders, pressure drums or tubes or used as a main valve for bundles of cylinders that convey compressed, liquefied or dissolved gases.

These are requirements for VIPRs that are in addition to those given in the relevant closure standard, for example, in ISO10297 for cylinder valves, in ISO17871 for quick-release cylinder valves, in ISO17879 for self-closing cylinder valves or in ISO23826 for ball valves. For ISO17871, these requirements are only applicable to quick-release cylinder valves types B, C, D and E.

NOTE1 If the pressure regulating system of a VIPR is acting as the primary valve operating mechanism, it is covered by the relevant closure standard, e.g. ISO10297, ISO17871, ISO17879 and ISO23826. 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 system.

NOTE2 If the primary valve operating mechanism of a VIPR is located at the low-pressure side of the pressure regulating system, it is covered by the relevant closure standard, e.g. ISO10297, ISO17871, ISO17879 and ISO23826.

NOTE3 The term “pressure receptacle” is used within this document to cover instances where no differentiation is necessary between gas cylinders, bundles of cylinders, pressure drums and tubes.

This document does not apply to VIPRs for

cryogenic applications.

NOTE4 Additional requirements for a VIPR with a residual pressure device (RPD) are specified in ISO15996.

NOTE5 Additional requirements for pressure relief valves can exist in international/regional regulations/ standards.