CN203413222U

CN203413222U - Sealing device for valve shaft of butterfly valve

Info

Publication number: CN203413222U
Application number: CN201320417069.5U
Authority: CN
Inventors: 徐国涛; 许昭庆; 王红松; 常涛强
Original assignee: BEIJING BEIGAO VALVE Co Ltd
Current assignee: Beijing Beigao Valve Group Co ltd
Priority date: 2013-07-12
Filing date: 2013-07-12
Publication date: 2014-01-29
Anticipated expiration: 2023-07-12

Abstract

The utility model relates to a sealing device for a valve shaft of a butterfly valve. The sealing device comprises a bushing (1) which is arranged between a valve body and the valve shaft, wherein sealing rings (2) are arranged on the outer circumference and inner circumference of the bushing (1) respectively. With the adoption of the sealing device, the valve shaft of the butterfly valve can be prevented from leakage, and the strength of the valve shaft can be improved.

Description

Seal arrangement for butterfly valve shaft

Technical field

The utility model belongs to valve seal field, is specifically related to a kind of seal arrangement for butterfly valve shaft.

Background technique

Valve leakage out of steam system phenomenon is that of valve industry is difficult to the problem solving always, leaking outside of butterfly valve mainly concentrates on the outside leakage of valve shaft sealing, most butterfly valve is all to adopt at valve shaft place processing groove, the structure of stuffing box is installed, but this structure, due to technological problems, has not only reduced the intensity of valve shaft, and because stuffing box and valve body all exist error in course of working, can not guarantee the sealing between stuffing box and valve body, stuffing box and valve shaft, for leaking of valve left hidden danger.In this background Xia， our company, through the structural analysis to existing butterfly valve product, find out deficiency, adopted modern designs means to improve the structure of butterfly valve, invented the seal arrangement of structure novel.

Model utility content

For the defect existing in prior art, the utility model provides a kind of seal arrangement of butterfly valve shaft, has not only solved the leakage problem of butterfly valve shaft, has also improved the intensity of valve shaft.

For reaching above object, the technical solution adopted in the utility model is: a kind of seal arrangement for butterfly valve shaft is provided, comprises the lining being arranged between valve body and valve shaft, on the excircle of described lining and inner circumference, be equipped with seal ring.

Further, on the excircle of described lining and inner circumference, be equipped with groove, described seal ring is placed in respectively in corresponding groove.

Further, the seal ring on described excircle from the seal ring on inner circumference on different axial heights.

Further, described seal ring is O RunddichtringO.

Useful technique effect of the present utility model is: by be provided with lining between valve shaft and valve body, on the excircle of lining and inner circumference, be provided with seal ring, guaranteed the double seal between valve shaft and lining, lining and valve body; In addition, adopt this seal arrangement valve shaft place processing groove again, thereby also improved the intensity of valve shaft, extended the working life of valve shaft; Cost is low, lightweight, and sealability is more reliable.

Accompanying drawing explanation

Fig. 1 is the plan view of the utility model seal arrangement;

Fig. 2 is the erection drawing of the utility model seal arrangement.

In figure:

1-lining 2-seal ring 3-valve shaft 4-valve body

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.

As shown in Figure 1, the seal arrangement that the utility model provides, comprises lining 1, and lining 1 adopts 101 less nylon materials of friction factor, is equipped with EPDM seal ring 2 on the excircle of lining 1 and inner circumference, and described seal ring 2 is O type.Wherein, the seal ring on excircle and seal ring on inner circumference can be on identical axial heights, also can be on different axial heights, but for guarantee stressed evenly, preferably on different axis height.

As shown in Figure 2, above-mentioned seal arrangement uses in butterfly valve, is specifically arranged between the valve body 4 and valve shaft 3 of butterfly valve, plays the seal action of valve shaft, prevents that valve shaft from leaking.

Lining 1 adopts 101 less nylon materials of friction factor, like this, when butterfly valve in use, the frictional force producing between lining and valve shaft is little, can reduce the rotation torsion of valve, thereby use less power just can open and close easily valve, reduce the expense of drive unit.

The excircle of lining 1 and inner circumference are provided with EPDM seal ring 2, and EPDM is ethylene propylene diene rubber, have resistance to oxidation, anti-ozone and erosion-resistant ability.The seal arrangement of this structure, can be by the leakage of both direction block media: first the seal ring on inner circumference by elasticity tightly hold valve shaft tightly, thereby stopped medium, from valve shaft, leak; Secondly the seal ring on excircle is through the extruding of lining and valve body, and being close together with valve body, lining tightly, leaks between valve body and lining thereby stopped medium, has guaranteed double seal, has prevented the leakage for the second time of valve.

In addition, butterfly valve of the prior art is all to adopt at valve shaft place processing groove, the structure of stuffing box is installed, reduced thus the intensity of valve shaft, seal arrangement of the present utility model, not be used in valve shaft place processing groove, but be provided with lining between valve shaft and valve body, lining is provided with seal ring, so prevented the leakage of valve shaft, has improved again the intensity of valve shaft.

Butterfly valve mainly uses in pipeline, and the use quality of valve depends primarily on sealability.Experiment showed, seal arrangement of the present utility model under the pressure of 20kg without leakage phenomenon.

Seal arrangement for butterfly valve shaft of the present utility model is not limited to above-mentioned embodiment, and those skilled in the art draw other mode of execution according to the technical solution of the utility model, belongs to equally technological innovation scope of the present utility model.

Claims

1. for a seal arrangement for butterfly valve shaft, it is characterized in that: comprise the lining (1) being arranged between valve body and valve shaft, on the excircle of described lining (1) and inner circumference, be equipped with seal ring (2).

2. the seal arrangement for butterfly valve shaft as claimed in claim 1, is characterized in that: on the excircle of described lining (1) and inner circumference, be equipped with groove, described seal ring is placed in respectively in corresponding groove.

3. the seal arrangement for butterfly valve shaft as claimed in claim 1 or 2, is characterized in that: the seal ring on described excircle from the seal ring on inner circumference on different axial heights.

4. the seal arrangement for butterfly valve shaft as claimed in claim 3, is characterized in that: described seal ring is O RunddichtringO.