Triple eccentric metal hard seal butterfly pneumatic valve structure characteristics

butterfly pneumatic valve has been in the chemical industry, metallurgy, oil and other industries widely used. Of course, soft seal butterfly pneumatic valve is in the majority. But in recent years, and in some high temperature; High pressure, strong corrosion, triple eccentric metal hard seal butterfly pneumatic valve application more widely. Triple eccentric metal hard seal butterfly pneumatic valve structure is characterized by pneumatic valve and pneumatic seat components are connected, pneumatic valve seat sealing surface layer welding temperature resistant, corrosion resistant alloy material. Multilayer soft fold type sealing ring on the pneumatic valve plate, the butterfly pneumatic valve compared with the traditional butterfly pneumatic valve with high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the regulating pneumatic valve sealing performance and prolong the service life of the advantages. Of course, this triple eccentric metal seal butterfly pneumatic valve has its inherent disadvantages: thick, pneumatic valve plate structure, flow resistance is big, therefore not suitable for small diameter pipe under the DN; , normally open pipe, pneumatic valve seat sealing surface by positive scour, affect on the pneumatic valve plate with multi-level hard fold sealing ring, long time will affect the sealing performance; , the principle of triple eccentric structure, pneumatic sealing face of valve plate and between the pneumatic valve seat seal is to rely on transmission torque pneumatic valve plate pressure to the pneumatic valve seat. Is flow state, the higher the medium pressure seal compression tight. When the countercurrent flow medium pneumatic valve plate and with the increase of medium pressure pneumatic seat unit is less than the pressure medium, the positive pressure between seal began to leak. Now have a new type of triple eccentric butterfly pneumatic valve, whose character is: pneumatic seat sealing described by soft t-shaped sealing ring on both sides of the multi-layer pieces of stainless steel. Pneumatic valve plate and seat sealing surface for the oblique cone structure, in the pneumatic valve plate oblique cone surface welding temperature resistance, corrosion resistant alloy material; Fixed between the adjusting ring clamp spring together with the clamp on adjusting bolt assembly structure. This structure can effectively compensate the body between the collar and pneumatic tolerance zone and pneumatic valve stem under medium pressure elastic change shape, solved the pneumatic valve in the two-way exchange medium sealing problems exist in the process of delivery. Soft T on both sides of the multi-layer stainless steel pieces of sealing ring, with metal sealing and soft sealing the dual advantages of under low temperature and high temperature circumstances, all with zero leakage sealing performance. With the development of mechanical technology, pneumatic valve adjustment of space is becoming more and more widely used, many disadvantages are also improved.