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Solenoid Main Classification
Sep 14, 2017

Electromagnetic valve (Electromagnetic valve) is an electromagnetic control of industrial equipment, is used to control the fluid of the basic components, are actuators, not limited to hydraulic, pneumatic. Adjust the direction, flow, speed and other parameters of the media in an industrial control system. Solenoid valves can be used with different circuits to achieve the desired control, and control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valves, different solenoid valves in different parts of the control system to play a role, the most commonly used is the one-way valve, safety valve, directional control valve, speed control valve.

working principle

The solenoid valve has a closed cavity, in different locations open through holes, each hole to connect a different tubing, the middle of the cavity is the piston, both sides are two electromagnets, which side of the magnet coil valve body will be attracted to where Side, by controlling the movement of the valve body to open or close the different drain holes, and the oil inlet is normally open, the hydraulic oil will enter a different drain pipe, and then through the oil pressure to promote the piston cylinder Driving the piston rod, the piston rod drive mechanism. This controls the mechanical movement by controlling the current on and off of the electromagnet.

Main classification

1, the solenoid valve from the principle is divided into three categories:

Direct acting solenoid valve

Principle: power, the electromagnetic coil to produce electromagnetic force to close the closure from the valve seat, the valve open; power, the electromagnetic force disappears, the spring to close the valve on the valve seat, the valve closed.

Features: in vacuum, negative pressure, zero pressure to work properly, but the diameter is generally not more than 25mm.

Step-by-step solenoid valve

Principle: it is a combination of direct and pilot principle, when there is no pressure between the inlet and outlet, the power, the electromagnetic force directly to the pilot valve and the main valve closing parts in turn lift up, the valve open. When the inlet and outlet to start the pressure difference, the power, the electromagnetic force pilot small valve, the main valve chamber pressure rise, the upper chamber pressure drop, so the use of pressure to push the main valve up; power, the pilot valve using spring Force or medium pressure to push the closing member, move down to close the valve.

Features: In the zero pressure or vacuum, high pressure can also * action, but the power is larger, the requirements must be installed horizontally.

Pilot solenoid valve

Principle: When the electromagnetic force, the electromagnetic force to open the pilot hole, the upper chamber pressure drops rapidly in the closure around the formation of low pressure on the formation of high pressure, fluid pressure to promote the closure of the move up, the valve open; power, Hole closed, the inlet pressure through the bypass hole quickly chamber around the closing valve to form a low pressure on the lower, the fluid pressure to promote the closure of the downward movement, close the valve.

Features: High upper limit of fluid pressure range, can be installed (to be customized) but must meet the fluid pressure conditions.

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

3, the solenoid valve in accordance with the functional classification: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia with solenoid valve, gas solenoid valve, liquid solenoid valve, micro solenoid valve, Pulse solenoid valve, hydraulic solenoid valve normally open solenoid valve, oil with solenoid valve, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve.

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