There are many kinds of magnetic valves. Different solenoid valves play a role in different positions of the control system. The most commonly used ones are check valves, safety valves, direction control valves, speed regulating valves, etc.
So first say the working principle of the solenoid valve:
Solenoid valve has a closed chamber, open a through hole in different positions, each hole is connected to different tubing, the middle of the chamber is a piston, two sides are two electromagnets, which side of the magnet coil energized valve body will be attracted to which side, by controlling the movement of the valve body to open or close different oil holes, and the oil inlet hole is often open, hydraulic oil will enter a different oil discharge pipe, Then the pressure of the oil pushes the piston of the cylinder, which in turn drives the piston rod, which drives the mechanism. In this way the mechanical motion is controlled by controlling the current break of the electromagnet.
Solenoid valve is divided into three categories in principle:
1, direct acting solenoid valve
Principle: When energized, the electromagnetic force generated by the electromagnetic coil is lifted from the valve seat to open the valve; Power off, the electromagnetic force disappears, the spring to close the parts on the valve seat, the valve is closed.
Features: In vacuum, negative pressure, zero pressure can work normally, but the diameter is generally not more than 25mm.
2, pilot solenoid valve
Principle: When energized, the electromagnetic force pulls the pilot hole spool, the pilot hole open, the main valve piston chamber pressure drops, the main piston chamber and the lower chamber to form a low high pressure, so that the lower chamber pressure to push the main piston to move up, open the valve; When the power is off, the spring force to close the pilot hole, the upper chamber pressurization, the formation of the upper chamber and the lower chamber, the lower pressure, the medium pressure and the spring force to push the closing parts move down, close the valve.
Features: The upper limit of fluid pressure range is high, can be installed arbitrarily, but must meet the conditions of fluid pressure difference.
3, step by step 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, energized, the electromagnetic force directly to the pilot small valve and the main valve closing parts in turn up, the valve open. When the inlet and outlet reach the starting pressure difference, energized, the electromagnetic force pilot small valve, the main valve chamber pressure 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 spring force or medium pressure to push the closing parts, moving down, so that the valve is closed.
Features: In zero pressure difference or vacuum, high pressure can also be operated, but the power is large, must be installed horizontally.
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