This Standard specifies requirements for valve design, construction and manufacturing, type testing and marking.This Standard applies to valves intended to be fitted to gas cylinders which convey compressed, liquefied or dissolved gases.This Standard does not apply to valves for cryogenic equipment, fire extinguishers, or those with self-closing action.Additional specific requirements for valves fitted with devices, e.g. pressure-reducing, residual pressure-retaining and non-return mechanisms, are not covered by this Standard.NOTE: Correspondence between this Standard and ISO10297 is given in AppendixC.