2/2 Solenoid valve

2/2 Solenoid valve

1. The electromagnetic valve is divided into two categories:

1) direct moving solenoid valve:

Principle: when energized, the electromagnetic coil generates electromagnetic force to lift off the closing part from the seat and the valve opens; When the power is off, the electromagnetic force disappears, the spring closes the closing piece on the seat and the valve closes.

Features: normal working in vacuum, negative pressure and zero pressure, but generally not more than 25mm.

2) step by step solenoid valve:

Principle: it is a direct acting and pilot operated the principle of combining, when the inlet and outlet no pressure difference, after electrify, electromagnetic force directly to the pilot valve and main valve closed, in turn, lift, the valve opens. When the inlet and outlet reach the starting pressure difference, after the power is energized, the electromagnetic force leads the small valve, and the pressure of the lower chamber of the main valve rises, and the upper chamber pressure drops, thereby pushing the main valve upward with the pressure difference. When the power is off, the pilot valve USES the spring force or medium pressure to push the closure and move down to close the valve.