The structure and working principle of the solenoid valve
The solenoid valve is composed of a valve body, a valve cover, an electromagnetic component, a spring and a sealing structure. The sealing block at the bottom of the moving iron core closes the valve body inlet by the pressure of the spring. After being energized, the electromagnet is sucked, and the sealing block with a spring on the upper part of the moving iron core closes the exhaust port, and the airflow enters the film head from the air inlet to play 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 the spring force, moves downward, opens the exhaust port, blocks the air inlet, and the airflow of the film head is discharged through the exhaust port, and the diaphragm is restored. Original location. In our oxygen plant, there is an application in the emergency shut-off of the inlet regulator valve of the turboexpander.
When a current passes through the coil, an exciting action is generated, the fixed iron core sucks the moving iron core, and the moving iron core drives the spool and compresses the spring, changing the position of the spool, thereby changing the direction of the fluid. When the coil loses power, the spool is pushed by the spring force of the spring, and the core is pushed back to make the fluid flow in the original direction. In our oxygen production, the molecular sieve switching system forced valve is controlled by a two-position four-way solenoid valve, and the air flow is supplied to both ends of the piston of the forced valve. Thereby controlling the opening and closing of the forced valve.