Pneumatic valve pneumatic seat for joint components new butterfly valve advantages and disadvantages

at present, the pneumatic valve adjustment, as a kind of used to realize 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 had known the pneumatic butterfly valve, the sealing structure is used in its seal form 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 control pneumatic valve is triple eccentric metal hard seal butterfly valve, pneumatic valve body and seat for the Siamese components, pneumatic valve seat sealing surface layer welding temperature resistant and 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.
but, this kind of butterfly pneumatic valve in use process still exist the following problems:
a, due to multi-layer soft fold type sealing ring on the pneumatic valve plate, when the pneumatic 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, restricted by structure condition of the structure does not adapt to do diameter DN pneumatic valves, the following reason is pneumatic valve plate overall structure is too thick, large flow resistance.
3, due to the principle of triple eccentric structure, pneumatic sealing face of valve plate and between the pneumatic valve seat seal is to rely on actuator 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.
high performance triple eccentric two-way pneumatic valve, hard seal butterfly 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 heat resistance, corrosion resistant alloy material; Fixed between the adjusting ring clamp spring together with the clamp on adjusting bolt assembly structure.
this structure effectively compensate the body between the collar and pneumatic tolerance zone and pneumatic valve stem under medium pressure elastic deformation, 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.
pool are tested for flow state ( Medium flow direction and disc rotating at the same time, the direction of the sealing surface pressure is the drive torque and the medium pressure in the role of the pneumatic valve plate. Positive pressure medium pneumatic valve plate oblique cone surface and pneumatic valve seat sealing surface squeezed tight, sealing the better the results. When the current state, pneumatic valve plate and seat sealing between by the drive torque pneumatic valve plate pressure to the pneumatic valve seat. , with the increase of reverse medium pressure pneumatic valve plate and the positive pressure pneumatic seat between units is less than the medium pressure, adjust the ring after the loading of the spring deformation energy stored by compensation pneumatic 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 pneumatic valve plate directly installed on the pneumatic valve body, in the middle of the clamp and pneumatic seat add adjustable ring is the ideal way of two-way hard seal. It will replace the brake pneumatic valve, globe pneumatic valve and ball valve.