The principle and structure of the pneumatic valve the introduction of knowledge

diaphragm structure, heavy piece structure step by step, the forerunner, straight moving piston structure, membrane structure step by step piston structure, the forerunner of moving piston structure. 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, press on the pneumatic valve seat, spring to close the pneumatic valve is closed. Features: in a vacuum, negative pressure, can work properly when the zero pressure, but size one. 。 。
date back the history of the pneumatic valve, electromagnetic pneumatic valve at home and abroad so far, in principle can be divided into three categories: ( Namely: straight acting, children's guiding type 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 heavy piece of membrane structure, the structure, the forerunner in straight moving piston structure, step by step piston structure, the forerunner of moving piston structure. 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, press on the pneumatic valve seat, spring to close the pneumatic valve is closed. Features: 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 pneumatic 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 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, forerunner of the electromagnetic force 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 using the spring force or medium pressure push off, move down, to close the pneumatic valve. Features: when the zero differential pressure or vacuum and high pressure can reliable action, but power is larger, requirements must be installed level. Guiding type electromagnetic principle of 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 chamber through the bypass hole quickly shut in pneumatic valve using a form around on high pressure difference, fluid pressure push close move down, close the pneumatic valve. Features: high fluid pressure range limit, can be arbitrary installation ( Need to customize but fluid differential pressure conditions must be met.