Principle of Direct Acting Solenoid Valve

Figure 1 is a direct-acting solenoid valve. When the power is off, the solenoid valve is closed. When the solenoid valve coil is energized, the electromagnetic force generated makes the moving iron core and the static iron core attract, and the valve port is directly opened, and the medium is imported from the inlet. Flow to the outlet, when the coil is de-energized, the moving iron core is reset under the action of the return spring, and the valve port is directly closed, thereby cutting off the flow of the medium.

Direct-acting solenoid valves such as solenoid valves, regulating valves, electric valves

Features: simple structure, reliable action, can work normally under zero pressure difference or vacuum, can be installed in any direction, but generally suitable for diameters below 25mm.

Principle of step-by-step direct-acting solenoid valve

?????? Figure 2 shows a stepwise direct-acting piston solenoid valve. After the coil is energized, the moving iron core first drives the small valve to lift under the action of electromagnetic force, reducing the pressure on the main valve piston, and then driving the main valve. The valve piston uses the pressure difference to open the main valve piston and the medium flows. After the coil is powered off, the electromagnetic force disappears, and the moving iron core is reset due to its own weight and spring force. At the same time, depending on the medium pressure, the large and small valves can be closed tightly.

Step-by-step direct-acting piston solenoid valve such as: solenoid valve regulating valve electric valve

Step-by-step direct-acting diaphragm solenoid valve such as: solenoid valve, regulating valve, electric valve

Features: It can operate reliably even when there is zero pressure difference and vacuuming, but the power consumption is large, and the diameter is limited.

Pilot working principle

????? Figure 3 shows the pilot solenoid valve, which is composed of a pilot valve and a main valve. The two have a channel connection. When the solenoid valve coil is energized, the moving iron core and the static iron core attract to open the pilot valve hole. The pressure of the core back cavity flows to the outlet through the pilot valve hole. At this time, the pressure of the valve core back cavity is lower than the inlet pressure. The pressure difference is used to make the valve core separate from the main valve port, and the medium flows from the inlet to the outlet. When the coil is de-energized, the moving iron core is separated from the static iron core and the pilot valve hole is closed. The pressure in the back cavity of the spool is gradually balanced with the inlet due to the supplement of the inlet pressure. The valve spool closes the valve tightly due to the spring force.

Pilot piston solenoid valve such as: solenoid valve regulating valve electric valve

Pilot diaphragm solenoid valve such as: solenoid valve, regulating valve, electric valve

Features: low power consumption, large diameter, simple structure, arbitrary installation direction, but can only be used in occasions where there is a certain pressure difference between the two ends of the solenoid valve.

Two-position three-way principle

?????? Figure 4 shows a two-position three-way solenoid valve. This type of solenoid valve has three external ports A, P, O. There are two operating conditions. ① Reversing: When the coil is energized, the core is moved The gas of the static iron core is connected from P to A. When the coil is de-energized, the moving iron core closes the valve port on the valve body under the action of the spring force, and the gas communicates from A to O; ②Split: When the coil is energized, it moves The iron core sucks and connects the static iron core gas from A to P. When the coil is powered off, the moving iron core closes the valve port on the valve body under the action of the spring force, and the gas communicates from A to O.

Two-position three-way solenoid valve such as: solenoid valve, regulating valve, electric valve

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