How does a pneumatic solenoid valve work?

There is a closed cavity in the pneumatic solenoid valve, and there are through holes in different positions, each hole of the pneumatic solenoid valve leads to different oil pipes, the middle of the cavity is the valve, and the two sides are two electromagnets, and the magnet coil energized valve body on which side will be attracted to which side;

The pneumatic solenoid valve stops or leaks different oil discharge holes by controlling the movement of the valve body, and the oil inlet hole is normally open, the hydraulic oil will enter different oil discharge pipes, and then the oil pressure of the pneumatic solenoid valve pushes the piston of the oil gang, so that the mechanical movement of the entire solenoid valve is controlled by the current of the solenoid iron that controls the pneumatic solenoid valve.

The operating principle of pneumatic solenoid valves.

When we talk about the working position of the pneumatic solenoid valve (the solenoid valve is open or closed), we actually refer to the position of the valve core of the pneumatic solenoid valve.

The spool is in position A when the ring is not energized, and the ring is in position B when it is energized. When the valve core of the pneumatic solenoid valve is in different positions, the interfaces on the valve body are either connected or closed. For example, the two-position solenoid valve means that the valve core of the solenoid valve has two different working positions (open or closed), which is the live state and the lost state of the solenoid valve for pneumatic solenoid valves; For the valve it controls, it is the opening and closing of the valve.

Two-way and three-way solenoid valves refer to the valve body of pneumatic solenoid valves with two or three channel ports. The two-position two-way solenoid valve has two channels of one input and one exit, which is the most common pneumatic solenoid valve; The two-position three-way solenoid valve is one in and two out of three channels, of which the two outlet channels are respectively normally open and normally closed. Similarly, the tee, four-way, and five-way also refer to the number of fluid channels on the valve body.

The working principle of the solenoid valve, Boshun solenoid valve has a closed cavity, and there are through holes in different positions, and each hole leads to a different one.

In the middle of the oil pipe cavity is the valve, and there are two electromagnets on both sides, and the magnet coil on which side is energized will be attracted to which side and pass through.

Control the movement of the valve body to block or leak different drain holes, and hydraulic oil with normally open oil will enter different.

The oil drain pipe then pushes the piston of the oil through oil pressure, and the piston drives the piston rod, and the piston rod drives the mechanical device.

In this way, the mechanical movement is controlled by controlling the current of the electromagnet.

So far, solenoid valves at home and abroad are divided into three categories in principle.

Namely: direct-acting, step-by-step child pilot).

From the difference in the structure and material of the disc and the difference in principle, it is divided into six branch subcategories.

Direct-acting diaphragm structure, step-by-step heavy film structure, pilot diaphragm structure, direct-acting piston structure, step-by-step direct-acting piston structure, pilot piston structure).

It is the basic element of automation used to control the fluid, which belongs to the actuator; It is not limited to hydraulics, pneumatics. Used to control the direction of hydraulic flow, the mechanical devices of the factory are generally controlled by hydraulic cylinders, so it will use its working principle, there are closed cavities, there are through holes in different positions, each hole leads to different oil pipes, the middle of the cavity is a valve, two electromagnets on both sides, which side of the magnet coil energized valve body will be attracted to which side, by controlling the movement of the valve body to block or leak out different oil discharge holes, and the oil inlet hole is normally open, hydraulic oil will enter different oil discharge pipes, Then the pressure of the oil is used to push the piston of the oil rigid, and the piston drives the piston rod, and the piston rod drives the mechanical device to move. In this way, the mechanical movement is controlled by controlling the current of the electromagnet.

Tracing the history of development, so far, the principle at home and abroad is divided into three categories (namely: direct-acting, step-by-step child pilot-operated type), and from the difference in valve disc structure and material and the difference in principle, it is divided into six branch sub-categories (direct-acting diaphragm structure, step-by-step heavy film structure, pilot membrane structure, direct-acting piston structure, step-by-step direct-acting piston structure, pilot piston structure).

Direct-acting: Principle: When energized, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat and the valve opens; When the power is off, the electromagnetic force disappears, and the spring presses the shut-off against the valve seat and closes.

Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25mm.

DistributionDirect Acting:

Principle: It is a combination of direct action and pilot operated principle, when there is no pressure difference between the inlet and the outlet, after the power is on, the electromagnetic force directly lifts the pilot valve and the main valve closure up in turn, and the valve opens. When the inlet and outlet reach the starting pressure difference, after the power is applied, the pressure of the lower chamber of the electromagnetic pilot valve and the main valve rises, and the pressure of the upper chamber decreases, so as to use the pressure difference to push the main valve upward; When the power is off, the pilot valve uses the spring force or medium pressure to push the shut-off and move it downwards to make it close.

Features: It can also operate when there is zero pressure difference or vacuum and high pressure, but the power is large, and it must be installed horizontally.

Pilot type: principle: when energized, the electromagnetic force opens the pilot hole, the pressure of the upper chamber drops rapidly, and a low and high pressure difference is formed around the closing piece, and the fluid pressure pushes the closing part to move up and open; When the power is cut off with caution, the spring force closes the pilot hole, and the inlet pressure quickly forms a low and high pressure difference around the closing valve through the bypass hole, and the fluid pressure pushes the closing part to move down and close.

Features: The upper limit of the residual range of fluid pressure is high, and it can be installed arbitrarily (needs to be customized) but must meet the fluid pressure difference conditions.