Introduces the vacuum butterfly valve gate structure characteristics and working principle

Vacuum butterfly valve door 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 door, is 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 gate system adopts 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. 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 door 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. Currently, fluorine-butterfly butterfly valve gate, line with rubber butterfly valve door, 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 gate 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. 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. A, vacuum butterfly valve door still exists in the process of using the following questions: 1, due to multi-layer soft hard 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. 2, limited by conditions of structure under the structure does not adapt to do path DN200 valves door, the reason is that the valve plate structure is too thick, large flow resistance. 3, due to the principle of the line with rubber butterfly valve gate, between the sealing surface of valve plate and valve seat sealing is to rely on transmission torque 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. 4, high-performance ventilation butterfly valve door 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. 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 door, and the spherical valve. http://www。 nwfamen。 com/news/T1/103。 html