Solenoid valves are divided into three categories in principle:
Direct acting solenoid valve
Principle: when energized, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat and open the valve; When the power is cut off, the electromagnetic force disappears, the spring presses the closing part on the valve seat, and the valve closes.
Distributed direct acting
Features: it can also operate at zero differential pressure or vacuum and high altitude, but the power is large, so it must be installed horizontally.
Pilot operated solenoid valve
Features: the upper limit of fluid pressure range is high, which can be installed arbitrarily (customized), but must meet the conditions of fluid pressure difference.
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