High life characteristics of stainless steel butterfly pneumatic valve (3)

at present, as for on-off and flow control components of the pipeline system of butterflies, has been in the oil, chemical industry, metallurgy, water, electricity, has been very widely used in many areas. In pneumatic butterfly valve has publicly technology, its sealing form sealing structure, sealing materials for rubber, ptfe etc. As the limit characteristics of the structure is not suitable for high temperature, high pressure, corrosion resistance, wear resistance, and other industries use. Existing a more advanced control pneumatic valve is triple eccentric metal hard seal butterfly valve, pneumatic valve and pneumatic seat components, pneumatic valve seat sealing surface layer welding heat resistance, corrosion resistant alloy material. Multilayer soft fold in pneumatic valve plate retaining ring, the traditional high temperature, convenient operation, opening and closing without friction, the relatively closed butterfly pneumatic valve actuator torque increases to compensate for sealing, improve the pneumatic butterfly valve sealing performance and prolong the service life of the advantages.
however, this is still a butterfly in the process of the following problems:
in the first place, soft and hard fold type sealing ring on the pneumatic valve plate, when the pneumatic valve plate normally open state media form, before the sealing surface erosion of sandwich with soft seal directly affect the sealing performance of coating metal plate.
second, the structure of the structural constraints do not comply with the following DN pneumatic valve diameter, thick because of CD, the overall structure of the flow resistance is big.
the third, because the three eccentric structure, pneumatic sealing face of valve plate and seat sealing principle on the torque transmission between the pneumatic valve board seats. Is flow state, the higher the medium pressure seal compression tight. With medium pressure pneumatic valve plate and seat unit pressure shelter-forest flow ratio between the medium pressure, sealing began to leak.
high performance three partial hardness seal butterfly pneumatic valve, its characteristic is: soft soil layer, as described in T pneumatic valve seat seal inside on both sides of the stainless steel sheet. Pneumatic valve plate and for the oblique cone structure, pneumatic valve seat sealing surface, in the pneumatic valve plate oblique cone surface welding heat resistance, corrosion resistant alloy material; Between the ring plate and the adjusting screw fixed leaf spring assembly structure adjustment. This structure effectively compensation between the collar and pneumatic valve stem in the central and elastic deformation under pressure, to solve the sealing problems in communication in the process of the transmission medium of two ventilation valve tolerance. In these two by T Soft stainless steel plate of polycyclic, with metal sealing and soft sealing both low and high temperature under the condition of double advantage, both sides with zero leakage sealing performance. Trials show that pool is flow state ( The medium flow direction at the same rotating direction) , the sealing surface pressure is medium pressure and torque transmission effect of pneumatic valve plate. Positive media pressure pneumatic valve plate oblique cone surface and pneumatic valve seat sealing surface squeezed tight, sealing the better the results. When the counter, pneumatic valve plate and seat between the drive torque pneumatic valve plate to the pneumatic seat tightness. As reverse medium pressure, pneumatic valve plate and the positive pressure pneumatic seat between units is less than the medium pressure, depending on the load adjusting ring in the spring, to make up for in to the pressure of pneumatic valve plate and seat stored in the sealing surface deformation by 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 but is installed directly on the body, in the middle of the clamp and pneumatic seat add adjustable ring is a two-way sealed very good method. It can replace the brake pneumatic valve and ball valve. Keywords:
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