Automatic change-over valves having a maximum outlet pressure of up to and including 4 bar with a capacity of up to and including 100 kg/h, and their associated safety devices for butane, propane or their mixtures

This EN defines the constructional and operational characteristics, the safety requirements and test methods, the marking, of automatic change-over valves with a capacity of less than or equal to 100 kg/h and having a maximum outlet pressure of less than or equal to 4 bar for butane, propane or their mixtures only in the vapour phase and referred to in the body of the text as "change-over valves". NOTE 1 bar = 105 Pa. Liquefied gases containing methylacetylene and propadiene are not covered by this standard.