Two-position two-way step-by-step direct-acting piston type solenoid valve, normally closed, adopts a structure that integrates one-time opening and two-time opening. The main valve and pilot valve work step by step, with electromagnetic force and pressure difference. Open the main valve port directly. When the coil is energized, the generated electromagnetic force causes the moving iron core and the static iron core to attract, the pilot valve port is opened, and the pilot valve port is set on the main valve core (piston assembly). The moving iron core and the main valve core (piston assembly) ) Are connected together. At this time, the medium (pressure) in the upper cavity of the main valve (piston assembly) flows out quickly through the pilot valve port, and the pressure decreases rapidly. Under the action of the pressure difference and electromagnetic force, the main valve core (piston assembly) Move upward to open the main valve port and the medium flows. When the coil is de-energized, the electromagnetic force disappears. At this time, the moving iron core and the piston close the pilot valve hole under the action of their own weight and spring force, and the medium enters the upper cavity of the main valve core in the balance hole to make the (main valve) piston assembly upper cavity When the pressure rises, the main valve port is closed under the action of spring reset and pressure, the medium is cut off, and the solenoid valve is closed.

The structure is a direct-acting solenoid valve with a piston type with zero pressure difference. It has a reasonable design structure and reliable action. It is also very reliable under zero pressure difference (including vacuum). It will also increase. The working pressure of the solenoid valve can be up to 25 bar during the design, and the small diameter can be up to 150 bar. The products of Sanlixin include SLQF, ZQDF, SMZ and other solenoid valves.
Solenoid valve application is based on various media, temperature, pressure, flow and other parameters, choose the material of the main valve, usually copper, stainless steel, etc., sealing materials include NBR, HNBR, VITON, EPDM, PTFE, etc., and the corresponding connection , Size and flow diameter; flow diameter from DN6.0 to DN50, can automatically control water, liquid, gas, steam, oil and other media.

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