Adjust the pneumatic valve in the pneumatic valve working under high and low temperature abnormal 5 kinds of solution 1

regulating pneumatic valve pneumatic valve working under high and low temperature abnormal solutions ( Methods) ) Uniform linear expansion method of reducing two-seater pneumatic valve leakage two-seater pneumatic valve in the normal temperature test, the leakage is not too big. However, a surge in leakage used in high temperature. This is because the two-seater fixed on the pneumatic valve pneumatic valve seat sealing surface linear expansion and pneumatic different linear expansion caused by the double sealing face of valve core. As a DN two-seater pneumatic valve, pneumatic valve core is stainless steel, pneumatic valve body for carbon steel, used in the temperature of the room temperature ° F, pneumatic valve seat sealing surface and core pneumatic valve sealing surface difference of linear expansion. Mm, increase leakage can reach more than times. Solution: (1) selecting pneumatic valve and pneumatic valve core are all made of the same material, the stainless steel pneumatic valve. But than carbon steel stainless steel pneumatic valve pneumatic valve prices high. Economically; Should such consideration; (2), the choice of pneumatic valve sleeve generation because of the sealing surface on the sleeve, sleeve and pneumatic valve plug is the same material. ) Pneumatic valve seat seal welding when the temperature as high as ° F, the threaded connection of the pneumatic seat with pneumatic sealing face of valve body and cause leakage, in thread and thread erosion, produce pneumatic seat in danger of falling, have this trouble, should think of the pneumatic valve seat seal welding, in order to prevent loose and fall off. ) Lap welding method as the positioning of the bushing, pneumatic valve, pneumatic valve core plug, pneumatic valve rod guide bushing, the vast majority of occasions is static. Regulating pneumatic valve combination indoors, work under high and low temperature, with tiny diameter changes caused by different linear expansion, bushing with the surplus quantity minimum, occasionally met or bushing with pneumatic valve core for foreign bodies stuck under the pull of pneumatic valve core movement, bush will fall off. This fault is not much, but often happened. That can transform set position welding, to ensure that the bushing will never fall off. ) Increasing the liner guide clearance method under high and low temperature, when the diameter of axle and bushing aperture in different linear expansion, and shaft inflation is greater than the expansion of the bushing hole, shaft's movement or rotation will generate CARDS phenomenon, such as high temperature butterfly pneumatic valve. If at this time of pneumatic valve working temperature and conform to the requirements of the working temperature of pneumatic valve, may be the quality problem of the factory. To solve the problem, nature is increasing guide clearance. Simple solution is to put the guide part of trunnion small car. ~。 Mm, and should try to improve the finish. ) Packed back to back the installation method of deep frozen cryogenic pneumatic valve, vacuum formed during cooling due to the line if the discharge from the body filler to pneumatic, can be part of the upper double packing, or packing to install back to back, to prevent the air through the drain in pneumatic valve stem seal.