Solenoid valve

Principle of direct-acting solenoid valve: When powered, the electromagnetic coil generates an electromagnetic force that lifts the closing element away from the valve seat, thereby opening the valve； When the power is cut off, the electromagnetic force disappears, and the spring presses the closing element against the valve seat, causing the valve to close. Features: It can operate normally under vacuum, negative pressure, or zero pressure, but the diameter generally does not exceed 25 mm. Principle of the pilot-operated solenoid valve: When electricity is applied, electromagnetic force opens the pilot hole, causing the pressure in the upper chamber to drop rapidly. This creates a pressure difference with higher pressure below and lower pressure above the closing element; the fluid pressure then pushes the closing element upward, thereby opening the valve ； When power is lost, the spring force closes the pilot hole; the inlet pressure rapidly creates a pressure difference around the valve closing element, with lower pressure at the bottom and higher pressure at the top. The fluid pressure then pushes the closing element downward, thereby closing the valve. Features: High upper limit for fluid pressure range; can be installed in any position (customization required), but must meet the fluid pressure difference requirements