Triple eccentric metal hard seal butterfly valve door using the structure of the problem

Content hint: triple eccentric metal hard seal butterfly valve door has a high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the sealing performance of the butterfly valve gate and prolong the service life of the advantages. But its still have structural problems. Currently, as a kind of used to implement the on-off and flow control components, piping system has been used in petroleum, chemical industry, metallurgy, water and electricity is widely used in many fields such as extremely. In butterfly valve gate technology is known, the dense form with seal structure, sealing materials for rubber, etc. Because of the limitation of structural features is not adapt to the high temperature, high pressure and corrosion resistance, wear resistance, etc. Present a more advanced butterfly valve door is triple eccentric metal hard seal butterfly valve, the valve body and valve seat component is connected, the valve seat sealing surface layer welding heat resistance, corrosion resistant alloy material. Multilayer soft fold type sealing ring fixed in the valve plate, the butterfly valve door compared with the traditional butterfly valve door has a high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the sealing performance of the butterfly valve gate and prolong the service life of the advantages. Triple eccentric metal sealing butterfly valve gate structure characteristics of triple eccentric metal sealing butterfly valve door butterfly plate rotary center ( The valve gate shaft center) And disc sealing surface to form A size A bias, and with the center line of the valve body to form A B bias; The center line of the sealing surface and the center line of the valve seat valve body ( The center line of valve body) Form a perspective for & beta; The angular position. But, this kind of butterfly valve door in use process still exist the following problems: first, because of the multilayer soft fold type sealing ring fixed in the valve plate, when the valve 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. Second, restricted by conditions of structure under the structure does not adapt to do path DN200 valves door, the reason is that the valve plate overall structure is too thick, large flow resistance. Third, because of the principle of triple eccentric structure, between the sealing surface of valve plate and valve seat sealing is to rely on drive torque to make pressure to the valve seat valve plate. Is flow state, the higher the medium pressure seal compression tight. When countercurrent flow medium with the increase of medium pressure between the valve plate and valve seat unit is less than the pressure medium, the positive pressure sealing began to leak. High-performance triple eccentric two-way hard seal butterfly valve gate, whose character is: described the valve seat sealing ring composed of soft t-shaped sealing ring on both sides of the multi-layer stainless steel sheet. The valve 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 the shaft sleeve and the valve body and the elastic deformation of the valve rod under medium pressure, solved the valve door in 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. 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 produced by the function of the valve plate. Positive medium pressure valve plate oblique cone surface and the valve seat sealing surface squeezed tight, sealing the better the results. When the current state, the valve plate and valve seat seal by the drive torque between the valve plate pressure to the valve seat. With the increase of reverse medium pressure, the positive pressure between the valve plate and valve seat unit is less than the medium pressure, adjust the 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. Therefore the utility model is not like the existing technology, the valve plate installed on the hard and soft multi-layer sealing ring, but directly installed on the valve body, in the middle of the plate and valve seat add adjustable ring is the ideal way of two-way hard seal. It will be able to replace gate valve gate, globe valve and ball valve.