Principle of Parker two-position solenoid valve

Solenoid valve is an automatic basic element used to control fluid, which belongs to the actuator and is not limited to hydraulic and pneumatic. Used in industrial control system to adjust the direction, flow rate, speed and other parameters of medium. The solenoid valve can cooperate with different circuits to realize the expected control, and the control accuracy and flexibility are guaranteed. There are many kinds of solenoid valves. Different solenoid valves play a role in different positions of the control system. The most commonly used are one-way valve, safety valve, direction control valve and speed control valve.

When electrified, the electromagnetic force opens the pilot hole, and the pressure in the upper cavity drops rapidly, forming a pressure difference between the upper and lower parts around the closing part, and the fluid pressure pushes the closing part to move upwards, thus opening the valve; When power is cut off, the pilot hole is closed by the spring force, and the inlet pressure quickly forms a lower and higher pressure difference around the closing valve through the bypass hole, and the fluid pressure pushes the closing piece to move downward, thus closing the valve.

There is a closed cavity in the solenoid valve, and there are through holes in different positions. Each hole is connected with a different oil pipe. There is a piston in the middle of the cavity and two electromagnets on both sides. When the electromagnetic coil on which side is energized, the valve body will be attracted to which side. By controlling the movement of the valve body, different oil discharge holes will be opened or closed, while the oil inlet hole is always open. Hydraulic oil will enter different oil discharge pipes, and then the piston of the oil cylinder is pushed by the oil pressure, which in turn drives the piston rod, which drives the mechanical device. In this way, the mechanical movement is controlled by controlling the on-off of the electromagnet.