Regulator valve working under high and low temperature abnormal solutions ( 5 ways) 1) Uniform linear expansion method of reducing two-seater valve leakage two-seater 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 valve seat sealing surface linear expansion and different linear expansion caused by the double sealing face of valve core. As a (two-seat valves, valve core is stainless steel, the body for carbon steel, at room temperature using the temperature of 70 ° F, the valve seat sealing surface and the Industrial Valves core sealing surface difference of linear expansion of 0. 6 mm, increase the leakage can be up to 10 times more. Solution: (1) choose the valve body and valve core are all made of the same material, the stainless steel valve. But the price of stainless steel valve than carbon steel valve up more than three times. Economically; Should such consideration; (2), the choice of sleeve valve generation because of the sealing surface on the sleeve, sleeve and the valve plug is the same material. 2) Seat sealing welding when the temperature up to 750 ° F, the threaded connection of the seat with the sealing face of valve body and cause leakage, in thread and thread erosion, produce seat in danger of falling, have this trouble, should think of to seal welding of the seat, to prevent loose and fall off. 3) Lap welding method as the positioning of the sleeve valve core and valve plug, stem guide bushing, the vast majority of occasions is static. Regulator combination indoors, work under high and low temperature, cooperate with tiny diameter changes caused by different linear expansion, bushing with the surplus quantity minimum, occasionally met or bushings and the valve core for foreign bodies stuck under the pull of 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. 4) 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 valve. If the valve of the actual working temperature and conform to the requirements of the valve working temperature, 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 car small 0. 2 to 0. 5 mm, and should try to improve the finish. 5) Packed back to back the installation method of deep frozen low-temperature valve, vacuum formed during cooling due to the line if the discharge from the body filler to, can be part of the upper double packing, or packing to install back to back, to prevent air leakage through the valve stem seal.
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