Structure and working principle of solenoid valve

Solenoid valve is widely used in our production. First, we have a preliminary understanding of solenoid valve, which is composed of solenoid coil and magnetic core, and is a valve body with one or several holes. When the coil is energized or de energized, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off, so as to change the direction of the fluid. The electromagnetic components of the solenoid valve are composed of fixed iron core, moving iron core, coil and other components; the valve body is composed of slide valve core, slide valve sleeve, spring base, etc. The solenoid is directly installed on the valve body, and the valve body is closed in the sealed pipe, forming a simple and compact combination. The solenoid valves we use in production are two position three-way, two position four-way, two position five-way, etc. Here we first talk about the meaning of two bits: for the solenoid valve, it is charged and de energized, and for the controlled valve, it is on and off.

It is composed of valve body, valve cover, electromagnetic component, spring and sealing structure. The sealing block at the bottom of the moving iron core closes the air inlet of the valve body with the help of spring pressure. After power on, the electromagnet is closed, the sealing block with spring on the upper part of the moving iron core closes the exhaust port, and the air flow enters the membrane head from the air inlet, which plays a control role. When the power is lost, the electromagnetic force disappears, the moving iron core leaves the fixed iron core under the action of spring force, moves downward, opens the exhaust port, blocks the air inlet, the air from the membrane head flows through the exhaust port, and the membrane returns to its original position. In our oxygen production equipment, it is used in the emergency cut-off of the membrane regulating valve at the inlet of the turbine expander

When there is current passing through the coil, the excitation effect is generated. The fixed iron core pulls in the moving iron core. The moving iron core drives the slide valve core and compresses the spring, which changes the position of the slide valve core, thus changing the direction of the fluid. When the coil loses power, push the slide valve core according to the spring force, and push the core back to make the fluid flow in the original direction. In our oxygen production, the switch of the force valve of the molecular sieve switching system is controlled by a two position four-way solenoid valve, and the air flow is respectively supplied to both ends of the piston of the force valve. So as to control the opening and closing of the forced valve.