Classification of solenoid valve electricity

A solenoid valve is an electromagnetically controlled industrial equipment, which is the basic element of automation for controlling fluids. It belongs to the actuator. It is used to adjust the direction, flow, speed, and other parameters of the medium in the industrial control system. Solenoid valves can be matched with different circuits to achieve the required control and ensure the accuracy and flexibility of the control. Solenoid valves can be divided into three principal categories: direct-acting solenoid valves, step-by-step direct-acting solenoid valves, and pilot-operated solenoid valves.

Here is the content list:

• Direct-acting solenoid valve

• Step-by-step direct-acting solenoid valve

• Pilot-operated solenoid valve

Direct-acting solenoid valve

The principle of the direct-acting solenoid valve is that 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 cut off, the electromagnetic force disappears, the spring presses the closing member on the valve seat, and the valve closes. The characteristic of the direct-acting solenoid valve is that it can work normally under vacuum, negative pressure, and zero pressure, but the diameter generally does not exceed 25mm.

Step-by-step direct-acting solenoid valve

The principle of the step-by-step direct-acting Solenoid Valve is a combination of direct-acting and pilot-operated. When there is no pressure difference between the inlet and outlet, the electromagnetic force directly lifts the pilot valve and the main valve closing part upwards in turn after the power is turned on the valve is open. After the power is turned on, when the inlet and outlet reach the starting pressure difference, the electromagnetic force pilots the small valve, the pressure in the lower chamber the pressure of the main valve increases and the pressure of the upper chamber decreases, so that the main valve is pushed up by the pressure difference; the pilot valve is closed by the spring force or the medium pressure the piece, move it down to close the valve. The characteristic of the step-by-step direct-acting Solenoid Valve is that it can also act safely at zero pressure difference or vacuum and high pressure, but the power is large and it must be installed horizontally.

Pilot-operated solenoid valve

The principle of the pilot-operated 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 the 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 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. The pilot-operated Solenoid Valve is characterized by a high upper limit of the fluid pressure range, which can be installed arbitrarily (need to be customized) but must meet the fluid pressure differential conditions.

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