CN2546698Y

CN2546698Y - Corrugated pipe shutoff valve

Info

Publication number: CN2546698Y
Application number: CN 02217337
Authority: CN
Inventors: 杨平华
Original assignee: ZHENHUA VALVE FACTORY TAIZHOU
Current assignee: ZHENHUA VALVE FACTORY TAIZHOU
Priority date: 2002-05-14
Filing date: 2002-05-14
Publication date: 2003-04-23
Anticipated expiration: 2012-05-14

Abstract

The utility model relates to a stop valve with the function of switching, which is used in medium flow controlling in industrial pipes. The utility model comprises a valve body, a valve core, a valve cover, a valve rod, a hand wheel and a corrugated pipe; the lower part of the corrugated pipe is welded together with the lower part of the valve core or the valve rod; the corrugated pipe clamps a sealing ring between the flanges of the valve body and the valve cover; the sealing ring is composed of a metal plate and flexible graphite that covers both sides of the metal plate; the upper end of the corrugated pipe is welded on the metal plate. Thus, even if the corrugated pipe is damaged or improperly welded which causes leakage, the sealing ring can still effectively ensure the axial sealing of the valve rod. Compared with prior art, the utility model has the advantages of reliable sealing performance, no leakage, convenient maintenance, labour saving, and long service life.

Description

A kind of bellows stop valve

The utility model relates to a kind of stop valve, relates in particular to a kind of stop valve that is used for industrial pipeline control media flow and plays on-off action.

Existing stop valve spool open and pass and aperture thereof by the valve rod realization that moves up and down, but medium can leak into the valve body outside by stuffing box packing along valve rod when opening state, cause valve body to produce the phenomenon of run, drip, leak, particularly along with the increase of pressure medium, the phenomenon of this run, drip, leak is also just more serious.For this reason, people put metal bellows in stem lower portion, the one end is welded on the spool, the other end is fixed on valve gap or the valve body, because stem lower portion is moved in flexible bellows by big envelope, the medium that enters body cavity when making work does not have any space and can let out, the shortcoming of having avoided existing stop valve to leak from the filler fray, but the stop valve of this structure can't guarantee the sealing after bellows damages.

The purpose of the utility model is to provide a kind of bellows stop valve that has double seal.Its technological scheme is such: it comprises valve body, places the valve body inner spool, runs through valve gap and the valve rod of fixedlying connected with spool and be contained in the handwheel of the valve rod the other end and be enclosed within bellows on the valve rod valve pocket section.The lower end of bellows and spool or valve rod lower end weld together, it mainly between the flange of valve body and valve gap clamping seal ring, seal ring is by tinsel and carry out the Expanded graphite layer cover its two sides and constitute; The upper end of bellows is welded on the tinsel.Like this, even bellows is damaged or because of welding the improper leakage that causes, seal ring still can guarantee the axial seal of valve rod effectively.It compared with prior art, it is reliable to have sealability, do not have to leak, easy to maintenance, rapid operation, advantages such as long service life.

Below in conjunction with embodiment shown in the drawings, the utility model is described in further detail.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the enlarged diagram of Figure 1A portion.

Fig. 3 is the enlarged diagram of Figure 1B portion.

Referring to Fig. 1, bellows stop valve is by valve body 8, valve gap 3, spool 7, valve rod 2, handwheel 1 and be enclosed within the metal bellows 6 of valve rod 2 bottoms and the seal ring 5 that is clamped between valve body 8, valve gap 3 flanges is formed.

Metal bellows is to make with the thick Stainless Steel Tube of 0.1-0.5mm, has stretchability, its big I is decided according to the size of stop valve, and the lower end of metal bellows 6 is welded on spool 7 or valve rod 2 lower ends, and the upper end of metal bellows 6 is welded on the tinsel 5b in the seal ring 5; Seal ring 5 is made up of the Expanded graphite layer 5a that tinsel 5b and shoe cover on tinsel 5b two sides, referring to Fig. 2.

In order to guarantee the multi-sealed property of valve rod 2, stuffing box packing 4 is housed in valve rod 2 and valve gap 3 contact position.

The utility model can also be made the conical surface 9 with spool 2 tip edge, correspondingly the valve seat 8a in the valve body 8 is made the inner conical surface 9 that matches, and forms conical surface seal after making spool 2 and valve seat 8a closure, and sealing effect is better, referring to Fig. 3.

Claims

1, a kind of bellows stop valve, by valve body (8), place the spool (7) in the valve body (8), be fixed on the valve gap (3) on valve body (8) flange, the bellows (6) that runs through valve gap (3) and the valve rod (2) of fixedlying connected with spool (7) and be contained in the handwheel (1) of valve rod (2) the other end and be enclosed within valve rod (2) valve pocket section is formed, the lower end of bellows (6) and spool (2) weld together, it is characterized in that: seal ring (5) in clamping between the flange of valve body (8) and valve gap (3), seal ring (5) is by tinsel (5b) and carry out Expanded graphite layer (5a) formation of covering its two sides, and the upper end of bellows (6) is welded on the tinsel (5b).

2, according to the described bellows stop valve of claim 1, it is characterized in that: be the conical surface (9) of working in coordination between the valve seat (8a) on described spool (2) and the valve body (8).