Traced the history of the electromagnetic wafer butterfly valve, so far, at home and abroad from the principle of the electromagnetic valve is divided into three categories (ie: direct acting, pilot operated step-children), and from the disc structure and the different materials and the difference principle is divided into six branches subclass (direct-acting diaphragm structure, step by step re-sheet structure of the pilot membrane structure, direct-acting piston structure, direct-acting piston structure step by step, the pilot piston structure.)
     
     Direct acting solenoid valve
     
     Principle: power, the electromagnetic coil of electromagnetic force to close the piece is lifted from the valve seat, the valve opens; power, the electromagnetic force disappears, the spring pressure in the valve seat to close the piece, the valve closes.
     Features: In the vacuum, negative pressure, zero pressure when working properly, but the path is generally not more than 25mm.
     
     Distribution of direct-acting solenoid valve
     
     Principle: It is a direct-acting and pilot combination of theory, there is no pressure when the inlet and outlet, the power, the electromagnetic force directly to the pilot valve and main valve lift off pieces in order, the valve opens. When the entrances and exits to start pressure, the power, the electromagnetic force pilot valve, main valve chamber under increased pressure, the chamber pressure drops, thus using up the pressure to open the main valve; power, the pilot gate valve with a spring or to medium pressure to promote off pieces, moving down, the valve closes.

     Features: zero pressure or vacuum, high pressure can also be * action, but the power is larger, the request must be installed level.

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