How Solenoid Valves Work

Solenoid valve is an automatic basic component used to control fluids. It belongs to the actuator. It is a valve that relies on the electromagnetic force generated by the power supply coil to drive the movable iron core to open and close the valve disc. It is an electromagnetically controlled industrial equipment and is used in industrial control systems. Adjust the direction, flow, speed and other parameters of the medium. In principle, it can be divided into three categories (direct-acting, distributed direct-acting, and pilot-operated). 1. Direct-acting water solenoid valve: Principle: When the power is turned on, the solenoid coil generates an electromagnetic force to lift the closing member from the valve seat, and the valve opens; when the power is off, the electromagnetic force disappears, and the spring presses the closing member on the valve seat, The valve is closed. Features: It can work normally in vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm. 2. Distributed direct-acting water solenoid valve: Principle: It is a combination of direct-acting and pilot-operated valves. When there is no pressure difference between the inlet and the outlet, after electrification, the electromagnetic force directly closes the pilot valve and the main valve. The parts are lifted 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: The upper limit of the fluid pressure range is high, which can be customized for any installation but must meet the fluid pressure differential conditions. A pressure difference is formed around the closing member, and the fluid pressure pushes the closing member to move upwards, and the valve opens; when the power is cut off, the spring force closes the pilot hole, and the inlet pressure passes through the bypass hole to rapidly form a lower pressure around the valve closing member. With a high differential pressure, the fluid pressure pushes the closing member down, closing the valve.
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