Pilot proportional solenoid valve TM1002605 excavator accessories

Direct acting solenoid valve:
Principle: When energized, the electromagnetic force generated by the electromagnetic coil lifts the closing part from the seat, and the valve opens; When the power is off, the electromagnetic force disappears, the spring presses the closing part on the seat, and the valve is closed.
Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25mm.
Distributed 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 the outlet, after the power is turned on, the electromagnetic force directly lifts the pilot small valve and the main valve closing part in turn, and the valve opens. When the inlet and outlet reach the starting pressure difference, after power, the electromagnetic force pilot small valve, the main valve lower chamber pressure rises, the upper chamber pressure drops, so that the pressure difference is used to push the main valve upward
Open; When the power is off, the pilot valve uses spring force or medium pressure to push the closing part and moves downward to close the valve.
Features: It can also be operated at zero pressure difference or vacuum and high pressure, but the power is large, and it must be installed horizontally.
Pilot operated solenoid valve:
Principle: When energized, the electromagnetic force opens the pilot hole, the upper chamber pressure drops rapidly, forming a low and high pressure difference around the closing part, the fluid pressure pushes the closing part to move upward, and the valve opens; When the power is off, the spring force closes the pilot hole, and the inlet pressure forms a low and high pressure difference around the valve closing part through the bypass hole rapidly, and the fluid pressure pushes the closing part to move downward and Close the valve.

Features: The upper limit of the fluid pressure range is high, can be installed arbitrarily (need to be customized), but must meet the fluid pressure difference conditions.