vacuum butterfly valve product features: 1, the line type disc plate and short structure, a new type of structure design and manufacture of the steel plate welding, compact structure, light weight, easy installation, small flow resistance, big circulation, avoid the influence of high temperature expansion, convenient operation. 2, no the connecting rod, bolts, etc. , reliable operation, long service life. Can be installed in a transfer, not affected by the medium flow direction. Usage: this butterfly valve is a kind of closed type butterfly valve, widely used in building materials, metallurgy, mining, power and other production process of medium temperature & le; 300 ℃ nominal pressure of 0. A line 1 mpa, to connect and open/close or adjusting medium quality. Structure features: this butterfly valve is adopted the midline type disc plate and short structure is a new type of structure design and manufacture of the steel plate welding, compact structure, light weight, easy installation, small flow resistance, big circulation, avoid the influence of high temperature expansion, convenient operation. The body without connecting rod, bolts, etc. , reliable operation, long service life. Can be installed in a transfer, not affected by the medium flow direction. Working principle: this butterfly valve actuator driven by a motor to drive, make the disc plate in 90 & deg; Within the scope of free rotation to achieve the goal of open/close or adjusting medium flow. At present, fluorine-butterfly butterfly valve, as a kind of used to implement the line with rubber butterfly Industrial Valves on-off and flow control components, piping system has been in the 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 valve 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. A, vacuum butterfly valve in use process there are still some problems: 1, due to multi-layer soft fold type sealing ring is fixed on the valve plate, when the Industrial Valves plate normally open state media on the sealing surface to form positive scour, soft sealing strip of metal sandwich after flushing, directly affect the sealing performance. 2, restricted by structure conditions the structure does not adapt to do under the path DN200 valves, because the valve plate structure is too thick, large flow resistance. 3, due to the principle of the line with rubber butterfly valve, sealing surface of valve plate and valve seat on drive torque is the seal between the valve plate pressure to the valve seat. Is flow state, the higher the medium pressure seal compression tight. When the countercurrent flow medium with the increase of medium pressure valve plate and valve seat unit is less than the pressure medium, the positive pressure between seal began to leak. 4, high performance ventilation butterfly valve whose character is: seat sealing described by soft t-shaped sealing ring on both sides of the multi-layer pieces of stainless steel. plate and valve seat sealing surface for the oblique cone structure, the valve plate oblique cone surface welding heat 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 tolerance zone between sleeve and body and the elastic deformation of the stem under medium pressure, solve the valves in the process of the two-way exchange medium conveying the sealing problems. 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. Trials show that pool is flow state ( Medium flow direction is same as the rotation direction of the butterfly plate) When the sealing surface pressure is the drive torque and medium pressure in the valve plate. Positive medium pressure valve plate oblique cone surface and valve seat sealing surface squeezed more tightly, sealing effect is better. Between the current state, the valve plate and Industrial Valves seat sealing pressure on drive torque make the valve plate to the seat. As the reverse medium pressure increases, the unit is pressure between the valve plate and valve seat is less than the pressure of medium, the adjusting ring after the loading of the spring deformation energy stored by compensating valve plate and valve seat sealing surface of the tight pressure automatic compensation effect. So the utility model is not like the existing technology, soft hard multi-layer sealing ring, installed in the valve plate directly installed on the valve body, in the middle of the plate and seat add adjustable ring is the ideal way of two-way hard seal. It will replace gate, and the spherical valve.

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