The rotary center of the flange butterfly valve disc ( That is the center of the valve stem) Located in the centerline of the body and disc sealing surface on the cross section. Seat is synthetic rubber. Closing butterfly plate the cylindrical seal face extrusion synthetic rubber seat, make produce elastic deformation and form elastic force as seating pressure to ensure that the butterfly valve sealing. Flange butterfly valve main characteristics as follows: 1, small and light, easy disassembling and maintenance, and can be installed in any position. 2, simple and compact structure, small operation torque, 90 ° rotating open quickly. 3, flow characteristic is straight line. Excellent regulation performance. 4, be used between the butterfly plate and the valve stem structure without pin, overcome the possible leak point. 5, butterfly plate adopts the cylindrical spherical shape, improves the sealing performance and prolong the service life of the valve, with pressure opening and closing more than 50000 times remain zero leakage. Flange butterfly valve 6, seal can be replaced, and reliable sealing achieve two-way sealing. 7, the butterfly plate spray coating according to user requirements, such as nylon or ptfe. 8, the valve can be designed as flange connection and connection to the clamp. 9, can choose manual, electric or pneumatic drive way. Flange butterfly valve is suitable for the temperature of 120 ℃ or 150 ℃ or less, or less nominal pressure 1 or less. 6 mpa water supply and drainage, sewage, food, heating, gas, shipping, water and electricity, metallurgy, energy systems, and textile industries, especially suitable for two-way sealing and body easy to rust, to adjust flow and intercepting medium. Flange butterfly valve sealing structure using ptfe and synthetic rubber compound seat, its characteristic is that the flexibility of the Industrial Valves is provided by the synthetic rubber and using low friction coefficient of ptfe and not easy to wear, not easy ageing, thus to improve the life of the butterfly valve. Flange butterfly valve in its seal principle and structure characteristics with ordinary linear butterfly valves are the same. The soft sealing butterfly valve with flange feature 1, the structure of the design is novel, the overall size is small, light weight. 2, the butterfly plate adopts double eccentric, opening and closing fast, convenient operation. 3, no sliding friction between the butterfly plate and the sealing ring, sealing surface wear resistance, long service life, reliable sealing, easy to adjust. Flange hard seal butterfly valve has the following characteristics 1, the disc sealing ring is hard and soft cascading sheet metal, has the dual advantages of metal hard seal and elastic sealing, no matter in the case of low and high temperature, has excellent sealing performance. 2, using three-dimensional eccentric structure, seat and disc almost frictionless, have the close tight sealing function. 3, valve sealing surface surfacing welding stainless steel, cobalt base carbide, sealing surface wear resistance, long service life. 4, unique structure, flexible operation, energy saving, convenient and not affected by medium pressure high, low, sealed performance is reliable. Flange characteristics of hard seal butterfly valve flange hard seal butterfly valves, as a kind of used to implement the on-off and flow control components, piping system in petroleum, chemical industry, metallurgy, water and electricity is widely used in many fields such as extremely. In butterfly valve technology has been known, its seal form with seal structure, sealing materials for rubber, ptfe, etc. Because of the limitation of structural features is not adapt to the high temperature, high pressure and corrosion resistance, wear resistance, etc. Existing a more advanced butterfly valve is a triple eccentric metal hard seal butterfly valve, the valve body and seat for the Siamese components, valve seat sealing surface layer welding temperature resistant, corrosion resistant alloy material. Multilayer soft fold type sealing ring is fixed on the Industrial Valves plate, the butterfly valve and the traditional butterfly valve compared with high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the butterfly valve sealing performance and prolong the service life of the advantages.
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