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
最大出口压力不超过4bar 容量不超过100kg/h的自动转换阀 以及丁烷、丙烷或其混合物的相关安全装置