The valve is a direct step-by-step action of the pilot solenoid valve, according to the power-off where the opening and closing of the different states can be divided into normally closed solenoid valve and normally open solenoid valve. Normally closed solenoid valve, the coil is energized, the armature in the electromagnetic force under the action of the first deputy to bring the valve plug lift, the main valve on the flow of the valve cup flow through the deputy valve to reduce the role of the pressure in the main valve cup, when the main valve When the pressure on the valve cup is reduced to a certain value, the armature will drive the main valve cup and use the pressure differential to open the main valve cup and the medium will flow. After the coil is de-energized, the electromagnetic force disappears and the armature is reset by its own weight. At the same time rely on media pressure, the main valve to be close close. Normally open solenoid valve, the coil energized due to suction, move the iron core down, the deputy valve plug pressed, deputy valve closed, the main valve cup cup pressure rises, when the pressure rises to a certain value, the main valve cup The same pressure up and down, due to the role of electromagnetic force, moving the core to promote the main valve cup, the main valve seat pressure, the valve closed. Coil power, the electromagnetic suction is zero, the deputy valve plunger and moving core uplift due to the action of the spring, the deputy valve is open, the main valve on the flow of the valve cup flow through the deputy valve to reduce the role in the main valve cup Of the pressure, when the pressure on the main valve cup reduced to a certain value, the use of pressure to push the main valve cup, the main valve is open, medium circulation.
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