Quality is everything! US Walker (WORK) imported direct acting solenoid valves use direct acting and pilot-combining principle, when there is no pressure inlet and outlet, the power, the electromagnetic force directly to the pilot valve and the main valve closure member in turn lifted up, valve is open. When the inlet and outlet reaches the starting pressure, the power, the electromagnetic force pilot valve, the main valve chamber under increased pressure, the chamber pressure drops, to take advantage of the upward pressure of the main valve open; power, the pilot valve with a spring force or medium pressure to promote off pieces, move down, so that the valve is closed. Features: 1, for a long time to stop the action restarted, the action also sensitive, long life 2, direct acting solenoid valve with a gas pilot-bound 3, special plastic coil, and can improve the reliability of the valve waterproof, moisture and difficult to burn 4, the coil spool and pull the piston starts, will work five normal at zero pressure, the valve are stainless steel piston, piston rings will not be stuck impurities in the medium Description: The valve can be in any way installation, forged body, beautifully compact, direct-action principle, responsive, sensitive, membrane structure, affordable, wide range of applications. How it works: NC: When the coil is energized, the electromagnetic force pilot hole first open the main valve piston chamber pressure drops, thereby utilizing the suction pressure and electromagnetic forces move the pilot spool linked the main piston, valve port opening; power outage , by the spring return to close the pilot hole, the main upper chamber pressurized piston, pushing the main piston moves down, the valve is closed. Normally open and normally closed opposite. When ordering, please provide the following information:? A nominal diameter (mm), nominal pressure (MPa), operating temperature range of two straight and before the pressure regulating valve, the valve pressure of 3 media name and status at 4 single seat??? valve supply voltage (220V or 380V, default 220V) 5 Input signal:??? 4-20mA, or 1-5V (default 4-20mA) 6 single-seat control valve body, the trim material requirements seven other special requirements (eg corrosion requirements, proof grade requirements, leakage class limits, etc.) USA Walker (WORK) Valves Chinese agents welcome your inquire and order!