solenoid valve for step-by-step actions directly guiding type solenoid valve, but according to power outages, in condition of different, can be divided into often closed solenoid valve and often open the electromagnetic valve. Normally closed electromagnetic valves, after electrify coil, armature vice valve under the effect of electromagnetic force to drive the valve plug, fluid by the deputy valve on the main valve cup run, reduce the pressure effect on the main valve cup, when the main valve cup pressure was reduced to a certain value, the armature drives the main valve cup, and by using pressure difference and make the main valve cup opening, medium circulation. Coil after power, the electromagnetic force disappears, armature due to falling weight reduction. Depend on medium pressure at the same time, the main valve to close shut. Normally open solenoid valve and coil electricity due to the suction effect, after moving iron core down, the deputy valve plug pressure, the deputy valve closed, pressure rise within the main valve cup, when the pressure rises to a certain value, the main valve cup of fluctuation pressure difference, due to the electromagnetic effect, promote the main valve cup of moving iron core, the pressure the main valve seat, the valve closed. Coil power, electromagnetic suction is zero, the deputy valve plug and due to the spring action of moving iron core lift, vice valve is opened, the fluid by the deputy Industrial Valves on the main valve cup run, reduce the pressure effect on the main valve cup, when the main valve cup pressure was reduced to a certain value, the use of differential pressure push the main valve cup, the main valve opens, medium circulation.

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