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    So far, traced the history of gas solenoid valve. From the principle of domestic gas is divided into three categories (ie: direct acting, pilot-step child) and from the valve on the different structures and materials with the principle difference between Class is divided into six branches (straight action diaphragm structure, step by step re-sheet structure, membrane structure, pilot, direct-acting piston structure, step by step direct-acting piston structure, pilot piston structure)
    Pilot gas solenoid valve: gas solenoid valve to open the pilot hole, gas solenoid valve works: When power. Quick landing on the chamber pressure, closed lower on the pieces formed around a high pressure, fluid pressure to promote the closure parts move up, the valve opens; energized, the spring forces the pilot hole closed, the inlet pressure chamber through the bypass Kong Minjie formed around the valve off on the high-low under the pressure, fluid pressure to promote the closure of parts down, closed the valve.
    Can be any installation (to be customized), but must meet the conditions of fluid pressure. Solenoid valve features: higher maximum fluid pressure areas.
     Distribute gas solenoid valve direct-acting: when there is no pressure at the inlet of imports, gas solenoid valve works: a direct-acting and pilot-phase joint principle. Power, the electromagnetic force directly to the pilot valve and main valve closed small pieces followed by lift, the valve opens. When the import and export to start pressure, the power, the electromagnetic force small pilot valve, main valve pressure chamber under increased pressure on the cavity landing, so the use of pressure to open up the main valve; power, the pilot valve with a spring force or pressure to promote the closure of media pieces, moving down, the valve closed but the power is larger, the solenoid valve features: zero pressure or vacuum, high pressure can also be action. Request the necessary level of equipment.
    Gas solenoid valve direct-acting: the electromagnetic force electromagnetic coil occurred pieces from the seat to lift the closure, gas solenoid valve works: When power. Valve open; power, the dissipation of the electromagnetic force, the spring pressure of the closure pieces on the seat, the valve closed.
 But not more than 25mm diameter valve features: vacuum, negative pressure, zero pressure to work properly.