The principle and types solenoid valve

Solenoid valve principle and type up the history of solenoid valve, so far, both at home and abroad of the electromagnetic valve in principle can be divided into three categories: namely, straight acting, children's guiding type step by step, and from a disc structure and material of the difference between the different and in principle is divided into six branches small class diaphragm structure, step by step of moving heavy piece structure, membrane structure, straight moving piston structure, the forerunner in straight moving piston structure, the guide piston structure step by step. Direct acting solenoid valve principle of electricity, the electromagnetic coil to produce electromagnetic force to shut down from the seat lift, the valve opening; Power, the electromagnetic force disappears, press on the seat, spring to close the valve closed. Characteristics in a vacuum, negative pressure, can work properly when the zero pressure, but size is generally not more than the mm. Distribution principle of direct acting solenoid valve it is a direct acting and pilot operated the principle of combining when the inlet and outlet no pressure difference, after electrify, electromagnetic force directly to combine small pilot valve and main valve closed in lift, the valve opens. When the inlet and outlet at startup pressure difference, after electrify, the electromagnetic pilot valve, main valve inferior vena pressure rising, the cavity pressure drop, which using differential pressure to the main valve opened up; Power cuts, pilot valve using the spring force or medium pressure push off, move down, to close the valve. Characteristics on the zero differential pressure or vacuum and high pressure, to * action, but power is larger, requirements must be installed level. Principle guiding type solenoid valve power, the electromagnetic force open the pilot hole, the chamber pressure drops rapidly, in closed form around the high low differential pressure, fluid pressure push close up, the valve open; Power off, the spring force to close the guide hole, inlet pressure chamber through the by pass hole quickly in closing valve using a form around the high differential pressure, fluid pressure push close move down, close the valve. The upper limit characteristics of the fluid pressure is higher, can be arbitrary installation ( Need to customize) But fluid differential pressure conditions must be met