Principle of pilot solenoid valve

Principle of pilot solenoid valve

Principle: when the power is on, the electromagnetic force opens the pilot hole, and the pressure of the upper chamber drops rapidly, forming a high and low pressure difference around the closing part. The fluid pressure pushes the closing part upward, and the valve opens; When the power is cut off, the spring force closes the pilot hole, the inlet pressure rapidly forms a pressure difference between the lower and the higher around the valve closing part through the bypass hole, and the fluid pressure pushes the valve closing part downward to close the valve.