CN101165375A

CN101165375A - Two-way hard seal butterfly valve

Info

Publication number: CN101165375A
Application number: CNA2006100973586A
Authority: CN
Inventors: 张逸芳; 于朝忠; 陆平
Original assignee: NANTONG SHENTONG SPECIAL VALVE ENGINEERING TECHNOLOGY RESEARCH CENTER Co Ltd
Current assignee: NANTONG SHENTONG SPECIAL VALVE ENGINEERING TECHNOLOGY RESEARCH CENTER Co Ltd
Priority date: 2006-10-19
Filing date: 2006-10-19
Publication date: 2008-04-23

Abstract

This invention provides a bidirectional sealing butterfly valve. It includes valve body, butterfly plate, valve support, clamping ring, clamping plate and sealing ring. The inner cavity of the valve body is arranged with projection. The valve support is fixed on the projection through clamping ring. The valve support and valve body are sealed by o shaped ring. The clamping ring and valve body are also sealed by the o shaped ring. The sealing ring is assembled on the butterfly plate through clamping plate. Elastic gasket is arranged between the valve support and projection of valve body. The end face of clamping ring contacting the valve support has pressure groove. Several connecting openings are evenly distributed along the radial direction of the pressure groove. This invention is simple and convenient.

Description

A kind of two-way hard seal butterfly valve

Affiliated technical field

The present invention relates to a kind of butterfly valve, especially a kind of butterfly valve of realizing two-way hard seal.

Background technique

The three eccentric hard seal butterfly valves that present metallurgy industry generally uses, when forward seals, because the existence of three off-centre, butterfly plate is under the effect of pressure medium, to the direction distortion that helps sealing, make seal ring press to valve seat, have the tight more sealing function in pass more, sealing effect is good, but when oppositely sealing, on the one hand because butterfly plate under the effect of pressure medium, orientedly is unfavorable for the direction distortion that seals, on the other hand, owing to when assembling, unavoidably have the gap between valve shaft and the butterfly plate axle bed, under the pressure medium effect, make seal ring that the trend that breaks away from valve seat be arranged, can not realize two way sealed.

Summary of the invention

Can not realize the deficiency of two way sealed for overcoming existing three eccentric hard seal butterfly valves, the invention provides a kind of two-way hard seal butterfly valve.

The technological scheme that its technical problem of solution of the present invention adopts is a kind of two-way hard seal butterfly valve, comprise valve body, butterfly plate, valve seat, trim ring, pressing plate, seal ring, body cavity is processed with boss, valve seat is fixed on the boss of valve body by trim ring, pass through seal with O ring between valve seat and valve body, trim ring and the valve body, seal ring is installed on the butterfly plate by pressing plate, elastic washer also is housed between the boss of valve seat and valve body, the end face that trim ring contacts with valve seat has pressure tank, a plurality of UNICOMs of pressure tank upper edge radial equipartition mouth.

The invention has the beneficial effects as follows simple in structurely, easy to process, can realize reliable two-way hard seal.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is embodiment's a sectional structural map;

Fig. 2 is the partial enlarged drawing at I place among Fig. 1.

Among the figure: 1. valve body; 2. trim ring; 3. pressure tank; 4. UNICOM's mouth; 5. seal ring; 6. pressing plate; 7. butterfly plate; 8. valve seat; 9. elastic washer.

Embodiment

As shown in Figure 1, 2, a kind of bidirectional sealed butterfly valve, comprise valve body 1, butterfly plate 7, valve seat 8, trim ring 2, pressing plate 6, seal ring 5, valve body 1 inner chamber is processed with boss, valve seat 8 is fixed on the boss of valve body 1 by trim ring 2, pass through seal with O ring between valve seat 8 and valve body 1, trim ring 2 and the valve body 1, seal ring 5 is installed on the butterfly plate 7 by pressing plate 6, elastic washer 9 also is housed between the boss of valve seat 8 and valve body 1, the end face that trim ring 2 contacts with valve seat 8 has pressure tank 3, a plurality of UNICOMs of pressure tank 3 upper edge radial equipartitions mouth 4.Exist under the backpressure, be when being the high pressure side on the left of Fig. 1, medium enters the pressure tank 3 of trim ring 2 by the UNICOM's mouth 4 on the trim ring 2, pressure action of medium is at the left surface of valve seat, simultaneously, because the existence of elastic washer 9 moves right valve seat 8, can eliminate distortion and the gap between valve shaft and butterfly plate 7 axle beds the influence of butterfly plate 7 like this, realize reliable two way sealed sealing.

Claims

1. two-way hard seal butterfly valve, comprise valve body, butterfly plate, valve seat, trim ring, pressing plate, seal ring, body cavity is processed with boss, valve seat is fixed on the boss of valve body by trim ring, by seal with O ring, seal ring is installed on the butterfly plate by pressing plate, it is characterized in that: elastic washer also is housed between the boss of described valve seat and valve body between valve seat and valve body, trim ring and the valve body, the end face that described trim ring contacts with valve seat has pressure tank, a plurality of UNICOMs of pressure tank upper edge radial equipartition mouth.