Direct acting solenoid valve

Principle: power, the electromagnetic force of the electromagnetic force to the closure of the valve from the valve seat, the valve is open; power, the electromagnetic force disappears, the spring put off the pressure on the valve seat, the valve closed.

Distributed direct acting solenoid valve

Principle: it is a direct acting and pilot combination of theory, when there is no inlet and outlet pressure, electricity, the electromagnetic force directly to the pilot valve and main valve off pieces in order to lift the valve open. When the entrances and exits to start pressure, the electricity, the electromagnetic force pilot a small valve, main valve cavity pressure increased, the chamber pressure drops, thus the use of pressure to push up the main valve; power, the pilot valve by the spring force or medium pressure to promote the closure of parts, moving down, so that the valve is closed.

Features: the zero pressure or vacuum, high pressure can also be a reliable operation, but the power is larger, the requirements must be horizontal.

Pilot type solenoid valve

Principle: power, the electromagnetic force to open the pilot hole, the chamber pressure to drop rapidly, in close formed around the low high pressure, fluid pressure to promote the closure of parts moving up, the valve open; power, the spring force the pilot hole closed, the inlet pressure through the bypass hole quickly the chamber around the valve off on the formation of low on the high pressure, fluid pressure to promote the closure of parts moving down, close the valve.