Sealing structure of threaded valve cover

A technology of sealing structure and threaded valve, applied in the direction of valve shell structure, engine sealing, valve details, etc., can solve problems such as failure, increased weld stress, unfavorable valve sealing, etc., to reduce the length of the cantilever beam and reduce the deflection The amount is beneficial to the sealing effect of the disc

Pending Publication Date: 2019-09-20
SUFA TECH IND CNNC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The outer circle of the valve clack is guided in the inner hole matched with the bonnet on the upper part of the valve clack. 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

Method used

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  • Sealing structure of threaded valve cover
  • Sealing structure of threaded valve cover

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing, the application is further described:

[0015] as attached figure 2 As shown, a threaded bonnet sealing structure, the bottom of the bonnet is flat, and there is a large gap between the valve body and the relief groove; a gasket is added between the valve body and the bonnet; the outer circle of the valve disc and the valve body The hole in the body cooperates with the guide, and the diameter of the inner hole of the valve cover is 0.5-1mm larger than the outer circle of the valve disc.

[0016] The technical features of the present invention are as follows: a sealing gasket is designed at the upper part of the valve body and the threaded step of the bonnet. Since there is a large gap between the valve body undercut and the valve body at the lower part of the bonnet, the gap makes the The thread relaxation caused by temperature and pressure changes will not affect the sealing effect of the gasket between the valve body a...

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Abstract

The invention belongs to the technical field of valves, and particularly relates to a sealing structure of a threaded valve cover. The sealing structure of the threaded valve cover comprises a valve clack, a valve body, the valve cover, a valve rod and a sealing gasket, wherein the sealing gasket is arranged between the valve body and the valve cover, the bottom of the valve cover is a plane, and a large gap is reserved between the bottom of the valve cover and a valve body cutter withdrawal groove. The sealing structure has the remarkable effects that the conical surface sealing of the valve body and the valve cover is cancelled, the sealing gasket is additionally arranged between the upper part of the valve body and a valve cover threaded step, and due to the fact that the large gap is reserved at the part, between the valve body cutter withdrawal groove and the valve body, of the lower part of the valve cover, the sealing effect of the sealing gasket between the valve body and the valve cover cannot be influenced by the thread looseness caused by temperature and pressure changes by means of the gap; and the diameter of an inner hole of the valve cover is larger than the outer circle of the valve clack by 0.5-1 mm, the inner hole of the valve cover does not play a guiding role, the inner hole of the valve body, instead of the outer circle of the valve clack, plays a guiding role, the length of a guiding cantilever beam of 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. 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 in the inner hole matched with the bonnet on the upper part of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K27/02F16K27/08F16J15/06
CPCF16K27/0254F16K27/08F16J15/062
Inventor 李军业彭新英刘毅
Owner SUFA TECH IND CNNC
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