How many kinds of solenoid valves are there?
The closing piece is lifted from the valve seat and the valve is opened; when the power is cut off, the electromagnetic force disappears
When the entrance and exit to start pressure, the power, the electromagnetic force pilot valve
Principle: it is a direct action and pilot combination of principles, when the inlet and outlet without pressure difference
Features: the vacuum, negative pressure, zero pressure can work normally, but the diameter is generally not more than 25mm.
Principle: when power is on, the electromagnetic coil generates electromagnetic force.
