ISO 22435:2024 outlines the 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. These are additional requirements beyond those specified in relevant closure standards, such as ISO 10297 for cylinder valves, ISO 17871 for quick-release cylinder valves, ISO 17879 for self-closing cylinder valves, or ISO 23826 for ball valves. For ISO 17871, these requirements only apply to quick-release cylinder valve types B, C, D, and E.
Note 1: If the pressure regulating system of a VIPR acts as the primary valve operating mechanism, it is covered by the relevant closure standard, such as ISO 10297, ISO 17871, ISO 17879, and ISO 23826. This also includes designs where the primary valve operating mechanism of a VIPR is obtained by closing the seat of the pressure regulating system.
Note 2: 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, such as ISO 10297, ISO 17871, ISO 17879, and ISO 23826.
Note 3: 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:
a) medical applications (see ISO 10524-3);
b) liquefied petroleum gas (LPG);
c) cryogenic applications.
Note 4: Additional requirements for a VIPR with a residual pressure device (RPD) are specified in ISO 15996.
Note 5: Additional requirements for pressure relief valves can exist in international/regional regulations/standards.
