The two-way pilot diaphragm solenoid valve has normally closed and normally open types. The solenoid valve is composed of a pilot valve, a main valve, and a diaphragm assembly that are connected to form a channel. The normally closed solenoid valve is closed when it is not energized. When the coil is energized, electromagnetic force is generated to make the moving iron core and the static iron core attract, the pilot valve port opens, and the medium flows to the outlet. At this time, the pressure in the upper cavity of the main valve core (diaphragm assembly) decreases rapidly, lower than the inlet side The pressure formed by the pressure difference, overcomes the spring force, and then moves upward to achieve the purpose of opening the main valve port, and the medium flows. When the coil is powered off, the electromagnetic force disappears, and the movable iron core resets and closes the pilot port under the action of the spring force. At this time, the medium flows in from the balance hole, and the pressure in the upper cavity of the main valve port (diaphragm group) increases, forming pressure At the same time, under the action of spring force, the diaphragm assembly moves downward to close the main valve port. The working principle of the normally open type is just the opposite.

The pilot diaphragm solenoid valve has a reasonable design structure and reliable action. It can work normally under the action of a small pressure difference (about 0.5bar). The solenoid valve can be designed with a large flow diameter, low cost, and solenoid power It is small, but due to the limitation of the diaphragm made of rubber material as the main valve port seal, and the solenoid valve should work for a long time, so the solenoid valve working pressure is up to 50 bar during the design. The conventional one is generally up to 20 bar, such as three Lixin products include SLP large-diameter series solenoid valves.
Solenoid valve application is based on the parameters of various media, temperature, pressure, flow, etc., the material of the main valve is selected, usually copper, stainless steel, cast iron, engineering plastics, etc., and sealing materials include NBR, HNBR, VITON, EPDM, Teflon, etc., And the corresponding connection, size and flow diameter; flow diameter from DN10 to DN200 mm.

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