Self-holding type solenoid valves

摘要

A self-holding type solenoid valve has an exciting coil 1 and an exciting circuit that switches the direction of flow of exciting current passing through the coil. When a positive exciting current flows through the coil, a movable iron core is attracted to a stationary iron core and held in the attracted position by a self-contained permanent magnet. When a reversed current flows through the coil, a return spring releases the movable iron core away from the stationary iron core.