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Electromagnetic valve classification
May 10, 2018

Solenoid valves are divided into three major categories:

Direct acting solenoid valve

Principle: When the power is turned on, the electromagnetic coil generates an electromagnetic force to lift the closing member from the valve seat and the valve opens. When the power is turned off, the electromagnetic force disappears. The spring presses the closing member against the valve seat and the valve closes.

Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.

Step-by-step direct-acting solenoid valve

Principle: It is a combination of direct acting and pilot type. When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closing part and the valve opens. When the inlet and outlet reach the starting differential pressure, after the power is turned on, the electromagnetic force leads the small valve, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber decreases, thereby pushing the main valve upwards by utilizing the pressure difference; when the power is off, the pilot valve utilizes the spring. Force or medium pressure pushes the closure and moves it downwards to close the valve.

Features: In the zero pressure difference or vacuum, high pressure can also be * action, but the power is relatively large, requires a horizontal installation.

Pilot solenoid valve

Principle: When the power is turned on, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the lower part and the upper part is formed around the closing part. The fluid pressure pushes the closing part to move upwards and the valve opens; when the power is turned off, the spring force leads the pilot. The hole is closed and the inlet pressure quickly bypasses the chamber to form a lower, upper high pressure differential around the valve closing member. The fluid pressure pushes the closing member downward and closes the valve.

Features: The upper limit of the fluid pressure range is high and can be installed arbitrarily (customization is required) but the fluid pressure difference must be met.

2. The difference between the valve structure and material and the principle of the solenoid valve is divided into six sub-categories: straight-acting diaphragm structure, step-by-step diaphragm structure, pilot diaphragm structure, direct-acting piston structure, Step-by-step direct-acting piston structure and pilot piston structure.

3, solenoid valve according to function classification: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature solenoid valve, gas solenoid valve, fire solenoid valve, solenoid valve for ammonia, gas solenoid valve, liquid solenoid valve, miniature solenoid valve, Pulse electromagnetic valve, hydraulic solenoid valve normally open solenoid valve, solenoid valve for oil, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve and so on.


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