FESTO solenoid valve from the principle divided into three categories

Direct-acting solenoid valve: Principle: power, electromagnetic coil generates electromagnetic force the closure of parts brought from the seat, the valve opens; power, the electromagnetic force disappears, spring to close the pressure in the valve seat, valve The door is closed. Characteristics: in vacuum, negative pressure, zero pressure can work, but the path is generally not more than 25mm.




Step-by-step direct-acting solenoid valves: Principles: It is a direct-acting and pilot - a combination of principle, when no pressure difference between inlet and outlet, the power, the electromagnetic force directly to the pilot valve and main valve to turn off parts in turn lift the valve opens. When the inlet and outlet reaches the start pressure, electricity, electromagnetic force pilot valve, main valve cavity pressure rise on chamber pressure drop, which use differential pressure to the main valve is pushed upwards; power failure, the pilot valve with a spring force or medium pressure to promote off, move down, so that the valve is closed. Features: * action also in the zero pressure or vacuum, high pressure, but the power is larger, the requirements must be mounted horizontally.




Pilot solenoid valve: Principle: power, electromagnetic force pilot hole open on the chamber pressure fell rapidly, close the pieces around the formation of low and high differential pressure, fluid pressure to promote off pieces to move up, the valve opens; energized, the spring force to the pilot hole Close the inlet pressure through the bypass hole quickly chamber off valve formed around a high pressure differential, the fluid pressure to promote the closure of parts moving down, close the valve. Features: higher maximum fluid pressure range can be freely installed (to be customized) but must meet the fluid pressure conditions. Solenoid valve from the valve structure and materials of different and the difference principle, be divided into six branch subclasses: straight diaphragm structure, step straight diaphragm structure, the pilot diaphragm structure, direct acting piston structure, step-by-step direct acting piston structure, the pilot piston structure.