Solenoid valve is one of the fluid flow control system is common, belongs to the automation of basic components, online writing, the working principle of electromagnetic valve are many is uneven, low technical content, head don't pick up the tail, here a while, there came a, silly, let I surprise, today we take six professional solenoid valve technical personnel together at the working principle of electromagnetic valve and reasonable summed up, and let the reader true correctly to understand the working principle of the solenoid valve. Foreword: before understand the working principle of the solenoid valve, you must first understand the kinds of electromagnetic valve, different kinds of electromagnetic valve, its working principle is very different, thus developed hundreds of thousands of kinds of electromagnetic valve, electromagnetic valve can divide the following several types. 1, 2, direct acting solenoid valve, step by step direct acting solenoid valve 3, guiding type solenoid valve 4, piston solenoid valve 5, diaphragm solenoid valve 6, the pulse type solenoid valve developed depending on the type of the above the following nearly hundred kinds of segmentation with solenoid valve solenoid valve water vacuum electromagnetic valve anti-corrosion solenoid valve solenoid valve brass dust removal liquid solenoid valve with high pressure solenoid valve solenoid anticorrosive LNG oil solenoid valve solenoid valve solenoid valve cast iron with high temperature and electromagnetic solenoid valve pneumatic solenoid valve solenoid valve solenoid valve steam temperature of cast steel solenoid valve CNG hydraulic solenoid valve solenoid valve steel explosion-proof solenoid valve solenoid valve air electromagnetic valve solenoid valve proportional electromagnetic valve plastic electromagnetic valve waterproof liquid gas gas solenoid valve solenoid valve solenoid valve inlet electromagnetic valve stainless steel hydrogen gas solenoid valve solenoid valve solenoid valve solenoid valve solenoid valve nitrogen gas emergency ptfe solenoid valve solenoid valve we currently listed above 35 points common electromagnetic valve, the subsequent will also add more categories! With function of 1, 2, manual reset signal feedback 3, explosion-proof solenoid valve plus sign manual reset manually reset mainly is to consider the condition of meet an emergency, at the same time of lost power supply can also use the manual to operate, to prevent the accident. Signal feedback in no other tool can accurately judge whether the electromagnetic valve is opened or closed, signal feedback function can be installed at this time will be open or closed signal transmitted to the central control system. Explosion-proof mark is needed in some inflammable and explosive occasions use installation of explosion-proof device to the solenoid coil, separating detonation model, the Ann model, etc. The first chapter direct acting solenoid valve working principle, ） Direct acting solenoid valve, when the 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. 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 the pilot Industrial Valves and main valve closed, in turn, 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. 1) Normally closed type, energized the electromagnetic coil to produce enough of the electromagnetic force in the moving parts ( By the magnetic core, the valve stem, top and bottom of the diaphragm/seal) From the seat, the valve opens; Power when the spring force to press the moving parts on the seat, the valve closed. 2) Normally open type, the movement direction contrary to the normally closed type. The second chapter step-by-step direct acting solenoid valve working 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 directly to the pilot valve and main valve closed, in turn, lift, the valve opens. When the inlet and outlet at startup pressure difference, after electrify, electromagnetic force to open the first pilot valve, main valve pressure rising, the cavity pressure drop, and the use of spring force or medium pressure push off, move down, to close the valve. Features: can be obtained on the zero pressure or vacuum, high pressure and reliable action, but power is larger, requirements must be installed level. By direct acting solenoid valve as the execution element of industrial process automation control system, can automatically open or close the valve after the power supply, to realize the on-off control of the fluid medium in the pipeline, it is widely used in metallurgical, petrochemical, pharmaceutical, food, medical, water supply and drainage, heating, air conditioning energy saving industry, scientific research, and other fields. Its circulation medium is air, gas, water, oil, preservatives, such as fluid, usually fluid pressure in 0 ~ 0. 6 mpa range. The solenoid valve is mainly composed of electromagnetic coil, valve body, valve cover, the main Industrial Valves core and moving iron core, springs and pressure relief hole and other parts. The third chapter the working principle of the solenoid valve (with ） Guiding type electric solenoid, electromagnetic force open the pilot hole, the chamber pressure drops rapidly, in closed form around the high low differential pressure, fluid pressure push close a mobile, valve opening; Power off, the spring force to close the guide hole, inlet pressure through by-pass hole quickly into the chamber in closing Industrial Valves using a form around the high differential pressure, fluid pressure push close move down, close the valve. Features: high fluid pressure range limit, can be arbitrary installation ( Need to customize) But fluid differential pressure conditions must be met.
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