the main valve disc fully open or fully closed or is in regulation

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solenoid valve air the same working principle of the hydraulic control valve diaphragm and piston type two types of valves are more than the downs tream pressure difference â–³ P as the driving force, controlled by the pilot valve, the diaphragm (piston) hydraulic differential operation, fully automatically by the hydraulic regulation, so that the main valve disc fully open or fully closed or is in regulation.direct acting solenoid valve