A kind of double-seat regulating valve with regulating rod and its assembling method

Abstract

The invention relates to a double-base adjusting valve with an adjusting rod and an assembly method thereof. The assembly method comprises the following steps: (1) a valve body is assembled with upperand lower valve bases; (2) an upper valve rod, a lower valve rod, an upper valve part, a lower valve part and an adjusting rod are assembled; (3) a module finished in the step (1) and a module finished in the step (2) are assembled; (4) a transverse pin, an adjusting sleeve and a locking device are assembled; (5) a valve cover, a bracket and a driving device are assembled; (6) pressure testing: an air pressure sealing test is performed: the valve is closed; then, air is transmitted from an inlet channel; the testing pressure is slowly increased to; and the leakage of an outlet channel is observed; and (7) a qualified double-base adjusting valve is dried by blowing, and the outer surface thereof is painted for storage. The assembly method has the advantages of simplicity, speediness and high assembly pass percent.

Description

technical field [0001] The invention relates to a regulating valve, in particular to a double-seat regulating valve with a regulating rod and an assembly method thereof. Background technique [0002] The double-seat regulating valve mainly includes: valve body, upper valve seat, lower valve seat, upper valve disc, lower valve disc, the valve body is equipped with inlet channel and outlet channel, the inlet channel is arranged horizontally, and the outlet channel is in a horizontal Y-shaped structure Set, between the inlet channel and the outlet channel, there is a cavity wall with a horizontal U-shaped structure, the upper valve seat is set on the upper part of the cavity wall, the lower valve seat is set on the lower part of the cavity wall, and the upper ends of the upper and lower valve seats are respectively provided with upper and lower valve seats. The sealing surface of the lower valve seat, the upper and lower valve discs are fixed in series at the lower part of the ...

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Problems solved by technology

[0002] The double-seat regulating valve mainly includes: valve body, upper valve seat, lower valve seat, upper valve disc, lower valve disc, the valve body is equipped with inlet channel and outlet channel, the inlet channel is arranged horizontally, and the outlet channel is in a horizontal Y-shaped structure Set, between the inlet channel and the outlet channel, there is a cavity wall with a horizontal U-shaped structure, the upper valve seat is set on the upper part of the cavity wall, the lower valve seat is set on the lower part of the cavity wall, and the upper ends of the upper and lower valve seats are respectively provided with upper and lower valve seats. The sealing surface of the lower valve seat, the upper and lower valve discs are fixed in series at the lower part of the valve stem, the lower valve stem is set between the upper and lower valve discs, the upper valve disc is set on the upper part of the outlet channel, and the lower valve disc is set on the inlet channel. There are upper and lower valve disc sealing surfaces in the middle of the upper and lower valve discs respectively. By moving the upper valve stem up and down, the distance between the upper and lower valve disc sealing surfaces and the upper and lower valve seat sealing surfaces can be controlled respectively, thereby The function of regulating the outlet pressure and flow of the valve is that due to the influence of processing errors and assembly, when the upper valve stem is moved, the distance between the sealing surface of the upper disc and the sealing surface of the upper valve seat cannot be compared with that of the lower disc. The distance between the sealing surface and the sealing surface of the lower valve seat is the same. When the valve needs to be closed, the fully sealed state cannot be achieved, and the leakage is large. At the same time, the upper valve disc and the lower valve disc are fixedly arranged, which is difficult to process and high in cost. technical flaws

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