CN2309476Y

CN2309476Y - Bellows stop valve

Info

Publication number: CN2309476Y
Application number: CN 97227892
Authority: CN
Inventors: 徐林斌
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-10-05
Filing date: 1997-10-05
Publication date: 1999-03-03
Anticipated expiration: 2007-10-05

Abstract

The utility model relates to a bellows stop valve with stronger sealing performance, and the utility model is mainly used for conveying pipe lines for toxic radioactive media with flammability. A valve rod is arranged in a valve body in the bellows stop valve, and a bellows is sheathed on the valve rod. A hand wheel is connected with the valve rod, and a valve cover is arranged on the upper side of the valve body. The utility model is characterized in that the bellows is a bellows with double layers, a valve flap arranged on the lower end of the valve rod is connected with the valve rod dismountably, the end surface of the valve flap is a plain surface, and a plain surface rolling bearing is arranged between the valve rod nuts and the inner side of the valve cover. The utility model has the advantages of high bellows strength, long service life, flexible operation and good sealing performance.

Description

Bellows stop valve

The utility model relates to the stronger bellows stop valve of a kind of sealing, is mainly used in poisonously, has in the transfer line of radioactivity or inflammable, explosive medium.

Existing bellows stop valve as shown in Figure 1, it mainly is to be with a bellows in the valve rod lower end to strengthen its sealability.What but existing bellows stop valve adopted all is singel-ply bellows, and in use bellows is cracked easily, and leakage phenomenon easily takes place, and its working life is short.Being the conical surface with valve body and contacting of the flap lower end surface that links to each other with the valve rod lower end, its seal is relatively poor, (the flap lower surface is the plane among Fig. 1, is distinguishing characteristics of the present utility model).In addition, handwheel and valve rod are for being threaded, and when pressure was big, the operation handwheel was required great effort very much.

The purpose of this utility model is the working life that prolongs bellows, improves the seal of flap, and makes the operation of handwheel more laborsaving.

The technological scheme that realizes above-mentioned purpose is, valve rod is arranged in valve body, is with bellows on the valve rod, and the handwheel that links to each other with valve rod is valve gap on valve body, it is characterized in that: a, bellows employing double-ply bellows; The flap of b, valve rod lower end is that removable imperial formula is connected with valve rod, and the end face of flap is the plane; C, handwheel are connected on the Stem Mut, at the external diameter of Stem Mut the plane rolling bearing are housed.

The utility model has the advantages that: 1, owing to adopt double-ply bellows, its strength ratio singel-ply bellows height, corresponding long service life.2, flap adopts removable imperial formula to be connected with valve rod, when flap is scrapped because of wearing and tearing, flap can be changed, and will not change by whole stop valve, has more Economy.3, the flap surface design becomes the plane, and it is better than conical surface contact with its seal that contacts of valve body.4, at the Stem Mut external diameter plane rolling bearing is housed, it is very laborsaving that operated by handwheel is got up, and alleviates working strength of workers, the time under reach.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structural representation of existing bellows stop valve.

Fig. 2 is this practical structural representation.

Mark is among the figure: 1. valve body 2. flaps 3. are split annulus 4. stopping shims 5. flap glands 6. valve rods 7. bellowss 8. spirotallic gaskets 9. hexagon nuts 10. stud bolts 11. valve gaps 12. asbestos packings 13. bearing pins 14. cotter pins 15. swing bolts 16. Glands 17. hexagon nuts 18. packing rings 19. limiting boards 20. taper pins 21. asbestos packings 22. Stem Muts 23. grease cups 24. tack keys 25. handwheels 26. round nuts 27. plane rolling bearings.

As shown in Figure 2, the component identical have been omitted among Fig. 2 with Fig. 1.Position and the annexation of bellows 7 in stop valve is identical with existing technology, different is that bellows is an individual layer in the prior art, the utility model changes it into double-ply bellows, improved the intensity of bellows greatly, and it can satisfy the requirement of stretchability fully, and double-ply bellows itself belongs to prior art.

Flap 2 is that removable imperial formula is connected with valve rod 6 lower ends, can pull down flap as required at any time in use and repair or replace.The lower end surface of flap 2 and valve body 1 are designed to plane contact with the surface of contact of flap, the flap surface is made the plane and is also had an advantage, exactly when flap reduces airtight performance because of wearing and tearing, flap can be pulled down and reuse after polishing, and the existing flap of band tapering can only be scrapped after being worn, and can not repair, reuse.

Handwheel 25 links to each other with Stem Mut 22, by the next valve gap upper end installed inside that places plane rolling bearing 27 is arranged at Stem Mut, and when rotating handwheel, bearing can play the labour-saving effect, is particularly useful for the bigger occasion of pressure.

The utility model master is applicable to poisonous, has on the transfer line of radioactivity or flammable medium.

Claims

1, a kind of bellows stop valve has valve rod in valve body, be with bellows on the valve rod, and the handwheel that links to each other with valve rod is valve gap on valve body, it is characterized in that;

A, bellows adopt double-ply bellows;

The flap of b, valve rod lower end is that removable imperial formula is connected with valve rod, and the end face of flap is the plane;

C, the plane rolling bearing is housed at the external diameter of Stem Mut.