Electromagnetic non-return valve for fluctuating pressure pipeline - comprises servo-valve and directly-acting electromagnetic valve with opposed spring-biased armatures, differential piston and disc seal

摘要

A two/two-way valve is assembled from two units working in opposite directions in a common housing (11). The influx (Z) is controlled by a servovalve (15a) with a differential piston (14a) moved by an electromagnet armature (15.1a). The other unit (15b) is a directly-acting electromagnetic valve with a disc (14b) on its armature (15.1b) which prevents any flow in the reverse direction, but does not offer any noteworthy resistance to the forward flow (A). USE/ADVANTAGE - E.g. fresh water supply to hot-water storage system. There is no significant pressure drop across non-return device.