How solenoid valve works

A solenoid is a mechanically simple electromagnetic device that converts electrical energy directly into linear motion. It is a solenoid valve that is controlled by an electromagnetic switch. Solenoid valve working principle:

The solenoid consists of a wire and a coil of a central iron plunger that allows movement through the coil.

Solenoid valve is mainly divided into two categories: normally open and normally closed

Normally open solenoid valve works: When the solenoid is energized, the valve is closed and when the solenoid is de-energized, the valve is opened.

Normally closed solenoid valve works: When the solenoid is energized, the valve is opened and when the solenoid is de-energized, the valve is closed. The

1. Direct-acting solenoid valve: When the power is turned on, the electromagnetic coil generates electromagnetic force, directly sucks the valve core, and the valve core displaces. When the power is turned off, the electromagnetic force disappears and the spool is reset by the spring.

2. The principle of distributed direct-acting solenoid valve: It is a combination of direct-acting and pilot-type. Normally closed type---When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly opens the pilot hole to connect the main valve and then the piston lifts upward and the valve opens. When the inlet and outlet reach the starting differential pressure, after the power is turned on, the electromagnetic force first When the pilot hole is opened, the pressure in the upper chamber of the main valve piston drops, so that the main piston is pulled by the pressure difference and the electromagnetic force, and the valve opening is opened; when the power is turned off, the pilot hole is closed by the spring return, the upper chamber of the main piston is pressurized, and the main piston is pushed downwards Move, valve closes. Normally opened and normally closed.

3, pilot solenoid valve working principle: normally closed type --- power, the electromagnetic force suction pilot valve core, the pilot hole is open, the main valve piston cavity pressure drop, in the upper and lower chamber of the main piston formed on the lower High pressure, so that the lower chamber pressure pushes the main piston to open the valve; when the power is turned off, the spring force resets and closes the pilot hole, the upper chamber of the main piston pressurizes, the upper chamber and the lower chamber of the main piston form a high and low pressure, medium pressure And the spring force pushes the main piston and the valve closes. Normally opened and normally closed.