"The solenoid valve is divided into three categories:

Direct solenoid valve

Principle: When energizing, the electromagnetic coil generates an electromagnetic force to lift the closure from the valve seat; the valve opens; when the power is powered off, the electromagnetic force disappears, and the spring is pressed against the valve seat, the valve is closed.

Features: In vacuum, negative pressure, and zero pressure can work normally, but the path is generally not more than 25mm.

Step-by-step straight solenoid valve

Principle: It is a straightforward principle. When the inlet is not differential pressure in the inlet and the exit, the electromagnetic force directly puts the pilot small valve and the main valve closure upward, the valve opens. When the inlet and the exit reaches the fixed pressure difference, the electromagnetic force pilot pneumatic valve, the main valve is rising, the upper cavity pressure is lowered, so that the main valve is pushed up by the pressure difference; when power off, the pilot valve utilizes the spring Force or media pressure push the closing piece, move down to close the valve.

Pilot type solenoid valve

Principle: When energizing, the electromagnetic force opens the pioneering hole, the upper chamber pressure drops rapidly, and the low-low high pressure difference is formed around the closing member, the fluid pressure drives the shutdown member upward moves, the valve opens; when the power is turned on, the spring force is piloted The hole is closed, the inlet pressure is formed by the bypass holes to form a low high differential pressure around the shutter member, and the fluid pressure is pushed down downward, and the valve is turned off. "

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