Principle of Steam Solenoid Valve

    1. The steam solenoid valve is a multi-stage pilot-operated solenoid valve. Depending on whether it needs to be open or closed when the power is off, it can be divided into normally open vacuum solenoid valves and normally closed vacuum solenoid valves.

    2. For the normally closed steam solenoid valve, when the solenoid coil is energized, the armature moves under the electromagnetic force and first lifts the pilot valve disc. The liquid on the main valve diaphragm flows out through the pilot valve, reducing the pressure on the main valve diaphragm. When the pressure on the main valve diaphragm drops to a certain value, the armature pushes the main valve diaphragm open, allowing the fluid to flow. When the solenoid coil is de-energized, the electromagnetic force disappears, and the armature drops due to its own weight, aligning itself. At the same time, the main and pilot valves are tightly closed with the help of the fluid pressure.

    3. For the normally open steam solenoid valve, when the solenoid coil is energized, the moving core is pressed down by the suction force, pressing down the pilot valve disc and closing the pilot valve. The pressure inside the main valve diaphragm increases. When the pressure rises to a certain value, the pressure difference on both sides of the main valve diaphragm becomes equal. Due to the electromagnetic force, the moving core presses down on the main valve diaphragm, tightly closing the main valve high-pressure gate valve.