How do Solenoid Valves work？

A Solenoid Valve is an automated basic component used to control fluids, belonging to actuators; it is not limited to hydraulics and pneumatics. A solenoid valve is used to control the direction of hydraulic flow. The mechanical devices in the factory are generally controlled by hydraulic steel, so Solenoid Valve is used. There are many kinds of solenoid valves. Different solenoid valves function at different points in the control system. Let's talk about the working principle of the solenoid valve first.

Here is the content list:

• The principle of ordinary Solenoid Valve

• Principles of other Solenoid Valves

Principles of ordinary Solenoid Valve

The working principle of the Solenoid Valve, is the Solenoid Valve has a closed cavity, and holes are opened at different positions. Each hole leads to a different tubing. The middle of the cavity is a valve, and the two sides are two electromagnets. Which side will the valve body be attracted to when it is energized, by controlling the movement of the valve body, the different oil outlet holes are blocked or leaked, the oil inlet holes are always open, and the hydraulic oil will enter different oil discharge pipes, and then pass through the pressure of the oil pushing the piston In the oil, the piston drives the piston rod, and the piston rod drives the movement of the mechanical device. In this way, the mechanical movement of the Solenoid Valve is controlled by controlling the current of the electromagnet.

Principles of other Solenoid Valves

In fact, according to the temperature and pressure of the flowing medium, for example, there is pressure in the pipeline, and there is no pressure in the self-flowing state. The Solenoid Valve works differently. For example, if the zero-voltage start is required in the self-current state, that is, after the power is turned on, the coil will suck up the gate body. The Solenoid Valve with a pressure state sucks out a pin inserted on the gate body after the coil is energized, and uses the pressure of the fluid itself to push the gate body up. For example, the working principle of the diaphragm type Solenoid Valve is that 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 the power is off, the spring force closes the pilot hole, the inlet pressure through the bypass hole quickly forms a pressure difference around valve closure, fluid pressure pushes the closure down to close the valve. The working principle of the piston-type Solenoid Valve is that after the coil is energized, due to the suction effect, the moving iron core moves down, the auxiliary valve plug is pressed down, the auxiliary valve is closed, and the pressure in the main valve cup rises. When the pressure rises to a certain value, The upper and lower pressure difference of the main valve cup is the same. Due to the action of the electromagnetic force, the moving iron core loses the main valve cup, presses the main valve seat, and the valve closes. When the coil is de-energized, the electromagnetic suction force is zero, the valve plug of the auxiliary valve and the supporting iron core is lifted due to the action under the action of the spring, the auxiliary valve is opened, and the fluid on the main valve cup flows away through the auxiliary valve, which reduces the impact on the valve. valve cup of the main valve. When the pressure on the main valve cup is reduced to a certain value, the main valve cup is pushed up through the pressure difference, the main valve is opened, and the medium flows.

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