So far, chasing the history of the development of gas solenoid valve. Domestic and foreign gas solenoid valve from the principle is divided into three categories (ie: direct-acting, step-by-step pilot) from the valve structure and material differences between the different and principle is divided into six sub-categories (Direct acting diaphragm structure, step-by-step rewetting structure, leading diaphragm structure, direct acting piston structure, step direct acting piston structure, pilot piston structure) Direct acting gas solenoid valve: Electromagnetic force occurs in electromagnetic coil Lift the valve seat, gas solenoid valve works: when powered. The valve opens; when the power is off, the electromagnetic force dissipates, the spring presses the closure against the valve seat, and the valve is closed. But the path is generally not more than 25mm Solenoid valve features: vacuum, negative pressure, zero pressure can work normally. Dissemination of direct-acting gas solenoid valve: When there is no pressure difference between the inlet and the inlet, gas solenoid valve works: a direct acting and pilot-based combination of the principle. Power, the electromagnetic force directly to the pilot valve and the main valve closing member in turn lifted up, the valve open. When the import and export to start the pressure difference, the power, the solenoid pilot small valve, the lower pressure in the main valve rises, the pressure drop on the cavity, so that the use of pressure to push the main valve upward; power off, the pilot valve spring Force or media pressure to promote the closure, move down, the valve closed. But the power is larger, the solenoid valve features: zero pressure or vacuum, high pressure can also * action. Request a required level device. Pilot gas solenoid valve: gas solenoid valve to open the pilot hole, gas solenoid valve works: when powered. The pressure on the upper chamber quickly landed, the formation of the upper and lower closure around the high pressure drop, the fluid pressure to promote closure of the upward movement, the valve opens; power failure, the pilot force of the pilot hole closed, the inlet pressure through the bypass hole agile chamber Off the valve around the formation of low pressure on the high pressure, fluid pressure to promote closure of the downward move, closing the valve. Can be installed (to be customized), but must meet the fluid pressure conditions. Solenoid valve features: High fluid pressure limit higher category. This article Keywords: solenoid valve
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