Pilot solenoid valve working principle

The pilot type two-way solenoid valve is mainly composed of a valve body, a normally closed main valve flap, a normally open main valve flap, a pilot valve flap, an electromagnet and the like. The main disc and the piston are connected by a ram (Fig. 1), which is characterized by an internal spring-free elastic reset element, which completely switches the gas passages by aerodynamic force and electromagnetic force, and controls the gas supply in the normally open chamber and the normally closed chamber. Sealed, maximum working pressure 5.0MPa.

When the electromagnet is in the de-energized state, the inlet gas is divided into two paths, one of which directly acts on the normally open main valve to open it, the solenoid valve normally opens the cavity B to supply air, and the other acts on the pilot valve flap and along the gas The passage enters the normally closed control chamber F to seal the normally closed main valve flap. When the electromagnet is energized, the pilot valve flap is closed, the gas in the normally closed control chamber F is discharged into the atmosphere from the air outlet D, the normally closed control chamber F is released, the normally closed main valve flap is opened, and the solenoid valve normally closes the chamber C to supply air. At the same time, the gas will also enter the normally open control chamber E along the gas passage, and the normally open main valve flap will be tightly sealed.

The pilot type solenoid valve is composed of a pilot valve and a main valve, and the two are connected by a channel. When the solenoid valve coil is energized, the movable iron core and the static iron core are attracted to open the pilot valve hole, and the pressure of the spool back cavity is passed through the pilot valve. The hole flows to the outlet. At this time, the pressure in the back chamber of the valve core is lower than the inlet pressure, and the pressure difference is used to move the valve core away from the main valve port, and the medium flows from the inlet to the outlet. When the coil is de-energized, the moving iron core is separated from the static iron core, and the pilot valve hole is closed. The pressure of the back cavity of the valve core is gradually balanced with the inlet pressure by the inlet pressure, and the valve core is tightly closed by the spring force.

Pilot operated solenoid valve.jpg

Pilot Solenoid Valve Features: The upper limit of the fluid pressure range is high and can be installed arbitrarily (customized) but must meet the fluid pressure difference conditions.

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