Three partial hardness sealing butterfly valve is widely used in medium temperature of 425 ℃ or less, metallurgy, electric power, petrochemical industry, water supply and drainage, and municipal construction and other industrial pipelines, to adjust flow and cutting fluid used. In previous articles, we introduce you to the sealing principle of all kinds of eccentric butterfly valve, butterfly valve, 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. Single eccentric butterfly valve and double eccentric butterfly valve because of the limitation of structural features is not adapt to the high temperature, high pressure and corrosion resistance, wear resistance, etc. Triple eccentric metal hard seal butterfly valve, the valve body and seat for connecting component and valve seat sealing surface layer welding temperature resistant and 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. Triple eccentric metal hard seal butterfly valve, whose character is: the 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 Industrial Valves 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. When the current state, between the valve plate and valve 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 Industrial Valves, globe valve and ball valve.
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