Threaded valve cover sealing structure with plane elastic sealing groove

Abstract

The invention belongs to the technical field of valves, and particularly relates to a threaded valve cover sealing structure with a plane elastic sealing groove. The threaded valve cover sealing structure comprises a valve clack, a valve body, a valve cover and a valve rod, wherein the bottom of the valve cover is a plane, a plane seal is formed by the bottom of valve cover and corresponding plane of the valve body, a groove which is similar to the omega shape is arranged in the position of the plane seal of the valve cover, a concave arc is arranged on the back surface of the groove, so that an elastic omega-shaped groove is formed. The threaded valve cover sealing structure has the remarkable effects that due to the fact that the plane seal of the bottom of the valve cover is designed into the elastic omega-shaped groove, the elastic groove can automatically compensate for thread relaxation under the change of temperature and pressure, so that the plane seal is kept effective under the change of the temperature and pressure; the pressure of a medium can increase the sealing force, so that the sealing effect of the plane seal can be enhanced; and the diameter of an inner hole of the valve cover is larger than the outer circle of the valve clack 0.5-1 mm, the inner hole of the valve cover does not have a guiding effect, the guide surface of the outer circle of the valve clack is changed into the inner hole of the valve body, so that the length of a cantilever beam guided by the valve clack is reduced, the deflection amount of the valve clack is reduced, and the sealing of the valve clack is facilitated.

Description

technical field [0001] The application belongs to the technical field of valves, and in particular relates to a threaded valve cover sealing structure with a planar elastic sealing groove. Background technique [0002] Small-diameter valves often adopt threaded bonnet sealing structure, and the common threaded bonnet sealing structure is as follows: figure 1 As shown, the bonnet is screwed into the valve body through threads, and there is a conical surface at the lower part of the bonnet. The conical surface forms the first conical surface seal after contacting the valve body. The second seal is formed by sealing welding at the center, the outer circle of the valve disc cooperates with the inner hole of the valve cover to form a guiding structure, and the valve stem drives the valve disc to move up and down through the T-shaped head. [0003] This structure has the following disadvantages: [0004] 1. The outer circle of the valve clack is guided at the place where the upp...

AI Technical Summary

Problems solved by technology

[0004] 1. The outer circle of the valve clack is guided at the place where the upper part of the valve clack matches the inner hole of the valve cover. The guiding position is on the upper side. When the valve is installed tilted or lying down, an obvious cantilever beam will be formed. When the valve clack is in the open state, Under the action of the medium, the deflection of the disc is relatively large, which is not conducive to the sealing of the valve

[0005] 2. When the temperature and pressure change, the thread will often loosen, making the tapered surface seal between the lower part of the valve cover and the valve body invalid, so that the sealing welding between the outer circle of the valve body and the valve cover will directly bear the medium pressure, making The weld is at risk of failure due to increased stress

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