Classification and working principle of solenoid valve in co

Classification and working principle of solenoid valve in cold drawing three-way machine

What is the classification and working principle of the solenoid valve in the cold drawing three-way machine?

First, direct action solenoid valve

Principle: when energized, the electromagnetic coil produces electromagnetic force to lift the closing part from the valve seat, and the valve is opened;Power, the electromagnetic force disappears, the spring to close the pressure on the seat, the valve is closed.

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

Two, the distribution of direct acting solenoid valve:

Principle: it is a combination of direct action and pilot principle, when there is no pressure difference between the inlet and outlet, after the power, the electromagnetic force directly to the pilot small valve and the main valve closed parts in turn up, the valve is opened.When the inlet and outlet to start the pressure difference, after the power, the electromagnetic force pilot small valve, the lower chamber pressure of the main valve rises, the upper chamber pressure drops, so as to use the pressure difference to push the main valve upward;When the power is off, the pilot valve uses the spring force or medium pressure to push the closing part, moves down, so that the valve is closed.

Features: at zero differential pressure or vacuum, high pressure can also be reliable action, but the principle of large power solenoid valve

Three, pilot solenoid valve:

Principle: electrified, the electromagnetic force to open the pilot hole, the pressure of the upper chamber rapidly drops, the formation of a high pressure difference around the closing part, the fluid pressure to promote the closing part moves up, the valve is opened;Power, the spring force to close the pilot hole, the inlet pressure through the bypass hole rapid chamber in the valve parts around the formation of low on high pressure difference, fluid pressure to promote the closure of the parts to move down, close the valve.

Features: high upper limit of fluid pressure range, can be arbitrarily installed but must meet the fluid pressure differential conditions.

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