scope:

This standard contains safety requirements for the material, design, manufacture and testing of automatic valves (see Clause 3) used in gaseous hydrogen vehicle fueling stations. This standard applies to newly manufactured

a) Pneumatically actuated valves

b) Check valves

c) Excess Flow valves

d) Electrically actuated valves 

This standard does not apply to:

a) Hydraulically actuated valves

b) Pressure regulating valves

c) Pressure relief valves; or

d) Fueling nozzle valves as covered by the Standards for Compressed Hydrogen Surface Vehicle Refueling Connection Device, SAE J2600, or ISO 17268 

A valve that complies with the requirements for a Class A valve may be used for a Class B valve application, however, a Class B valve may not be substituted for a Class A valve. (see Clause 3). 

All references to pressure throughout this document are to be considered gauge pressures unless otherwise specified. 

All dimensions used in this standard are in metric units [International System of Units (SI)], unless otherwise specified. If a value for a measurement, as given in this standard, is followed by an equivalent value in other units, the first stated is to be regarded as the specification.