The electromagnetic principle of pneumatic valve

the history of the pneumatic valve, electromagnetic pneumatic valve at home and abroad so far, in principle can be divided into three categories: ( I. e. , straight acting, direct acting and pilot operated step by step, and from the pneumatic valve structure and material of different and the difference on the principle is divided into six branches small class ( Diaphragm structure, step by step of moving membrane structure, membrane structure, the forerunner of moving straight moving piston structure, step by step piston structure, the forerunner of moving piston structure.



a, direct acting solenoid pneumatic valve
principle: electricity, electromagnetic coil to produce electromagnetic force to shut off pneumatic seat, pneumatic valve open; Power, the electromagnetic force disappears, the spring force closure pressure in the pneumatic seat, pneumatic valve shut off.
characteristics: in a vacuum, negative pressure, can work properly when the zero pressure, but size is generally not more than the mm.
2, step by step direct acting solenoid pneumatic valve
principle: it is a direct acting and pilot operated the principle of combining, when the inlet and outlet no pressure difference, after electrify, electromagnetic force the lead directly to the small pneumatic valve and main valve closed, in turn, lift, pneumatic valve to open. When the inlet and outlet at startup pressure difference, after electrify, electromagnetic force to open the first pilot small pneumatic valve, the main pneumatic valve inferior vena pressure rising, the cavity pressure drop, which using the differential the main pneumatic valve opened up; Power outages, the forerunner of pneumatic valve and the main pneumatic valve using the spring force or medium pressure push off, move down, to close the pneumatic valve.
features: on the zero differential pressure or vacuum and high pressure, can work reliably, but power is larger, requirements must be installed level.
3,
principle guiding type solenoid pneumatic valve: electricity, 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, pneumatic valve open; Power off, the spring force to close the guide hole, inlet pressure through by-pass hole quickly into the chamber in closing using pneumatic valves forms around the high pressure difference, fluid pressure push close move down, close the pneumatic valve.


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