Safety valve has compressed air-operated switching elements at associated points for safety valve if pressures different; valve only switched on again by external compressed air actuation

摘要

The valve has two parallel distributing valves switchable by pilot valves (26a, 26b), with valve plates in bores (36a,36b) connected via crossed channels (46a,46b) connected to pilot control valve seats. Each valve has a compressed air-operated switching element at associated points for blocking the valve for different pressures at these points. The valve is only switched on again by external compressed air actuation of at least one element.