Various electromagnetic valve works (Dieselpartsworld) 2016-01-22    

Various electromagnetic valve works

Solenoid valve is used to control fluid automation infrastructure components, belonging to the actuator; not limited to hydraulic, pneumatic. Solenoid valve for controlling the flow direction of the hydraulic, mechanical plant are usually controlled by hydraulic cylinder, so it will use the solenoid valve.
It works solenoid valve

Solenoid valve in the closed chamber, at different locations with holes, each hole leads to a different pipeline, the middle chamber is a valve, both sides are two electromagnets, which face the magnet coil is energized the valve will be attracted to which side, by controlling the movement of the valve body to a different file live or leaked oil discharge hole, and into the hole is normally open, the hydraulic oil will enter a different outlet pipe, then through the oil pressure to push oil just pistons, piston and drive the piston rod drive mechanism moving.

Thus by controlling the solenoid current is controlled mechanical movement. Right above the general principle of the solenoid valve is in fact, according to the temperature of the flowing medium, pressure and other conditions, such as pipeline pressure and gravity state without pressure. Solenoid valve works are different.

For example, in the state requires zero gravity pressure to start is energized, the brake coil entire body suck up. The state of the solenoid valve pressure, it is sucked out of the coil is energized inserted in the body of a pin gate, with the brake fluid pressure of their own body top up.

The difference between these two methods is that the solenoid valve gravity state, because the coil to pick up the entire brake body, so bulky and pressurized state of the solenoid valve, just pick up the pins, so the volume can do more small.

Direct acting solenoid valve:
Principle: power, the electromagnetic coil generates an electromagnetic force to the closure member is lifted from the valve seat, the valve opens; when power is off, the electromagnetic force disappears, the spring pressure in the valve closure member, the valve closes.
Features: can work in the vacuum, negative pressure, zero pressure, but the path is generally not more than 25mm.

Distribution of direct-acting solenoid valve:
Principle: It is the principle of a direct-acting and pilot-operated combination, when there is no pressure inlet and outlet, the power, the electromagnetic force directly to the pilot valve and the main valve closure member followed up, and the valve opens. When the inlet and outlet reaches the starting pressure, the power, the electromagnetic force pilot valve, the main valve chamber under increased pressure, the chamber pressure drops, which use pressure to push up the main valve; power, the pilot valve with a spring force or medium pressure to promote off pieces, moving down, the valve closes.
Features: zero pressure or vacuum, high pressure can also be * action, but power is larger, the requirements must be mounted horizontally.

Pilot solenoid valve:
Principle: power, the electromagnetic force open the pilot hole, the upper chamber pressure drops rapidly, around the closure member is formed on the lower high pressure, fluid pressure to promote the closure member is moved upward, the valve opens; when energized, the spring force of the pilot hole is closed, the inlet pressure through the bypass hole quickly shut the valve chamber is formed around the low pressure on the high fluid pressure to promote the closure member is moved downward to close the valve.