What is a solenoid valve? do you know?

by:Lianke Valve     2022-08-22
Solenoid valves are precisely actuators, which control the direction and speed of fluids in industry. The solenoid valve can work with different circuits to control the fluid. Because it is an electromagnetically controlled valve, its precision and flexibility are very good. And there are many types of solenoid valves. Different solenoid valves play a role in different positions of the control system, the most commonly used are check valves, safety valves, directional control valves, speed control valves, etc. Working principle The solenoid valve has a closed cavity with through holes in different positions. Each hole is connected to a different oil pipe. The middle of the cavity is a piston, and the two sides are two electromagnets. The magnet coil on which side is energized will attract the valve body. Where to go, by controlling the movement of the valve body to open or close different oil discharge holes, and the oil inlet hole is normally open, the hydraulic oil will enter different oil discharge pipes, and then push the piston of the oil cylinder through the pressure of the oil, The piston drives the piston rod, which drives the mechanical device. In this way, the mechanical movement is controlled by controlling the current on and off of the electromagnet. Main classification 1. Solenoid valves are divided into three categories in principle: 1) Direct-acting solenoid valves: Principle: When the power is turned on, the solenoid coil generates an electromagnetic force to lift the closing part from the valve seat, and the valve opens; when the power is off, the electromagnetic The force disappears, the spring presses the closing member against the valve seat, and the valve closes. Features: It can work normally in vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm. 2) Step-by-step direct-acting solenoid valve: Principle: It is a combination of direct-acting and pilot-operated type. When there is no pressure difference between the inlet and the outlet, after the power is turned on, the electromagnetic force directly closes the pilot valve and the main valve. Lift up one by one and the valve opens. When the inlet and outlet reach the starting pressure difference, after the power is turned on, the electromagnetic force pilots the small valve, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber drops, so that the main valve is pushed up by the pressure difference; when the power is off, the pilot valve uses a spring The force or medium pressure pushes the closing member, moving downward, causing the valve to close. Features: It can also act safely under zero pressure difference or vacuum and high pressure, but the power is large and it must be installed horizontally. 3) Pilot solenoid valve: Principle: When the power is turned on, the electromagnetic force opens the pilot hole, the pressure of the upper chamber drops rapidly, and a pressure difference between upper and lower parts is formed around the closing part, and the fluid pressure pushes the closing part to move upward, and the valve opens; When electrified, the spring force closes the pilot hole, the inlet pressure through the bypass hole quickly forms a pressure difference around the valve closing member, and the fluid pressure pushes the closing member to move down to close the valve. Features: The upper limit of the fluid pressure range is high, which can be installed arbitrarily (need to be customized) but must meet the fluid pressure differential conditions. 2. The solenoid valve is divided into six sub-categories from the difference in valve structure and material and the difference in principle: direct-acting diaphragm structure, step-by-step direct-acting diaphragm structure, pilot diaphragm structure, direct-acting piston structure, Step-by-step direct-acting piston structure and pilot piston structure. 3. Solenoid valves are classified by function: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, micro solenoid valve, Pulse solenoid valve, hydraulic solenoid valve normally open solenoid valve, oil solenoid valve, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve, etc. The above is the explanation of the solenoid valve. Lianke Valve Co.,Ltd. is a company dedicated to valve innovation and valve manufacturing, and strives to bring valves with a wider range of applications to everyone. Although the solenoid valve is controlled by electromagnetic, it is not very different from the ordinary valve.
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