CN201335194Y

CN201335194Y - Stop valve for corrugated pipe

Info

Publication number: CN201335194Y
Application number: CNU2008202201931U
Authority: CN
Inventors: 黄剑峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-03
Filing date: 2008-12-03
Publication date: 2009-10-28
Anticipated expiration: 2018-12-03

Abstract

The utility model relates to a stop valve for a corrugated pipe, in particular to a device used for petroleum industries and chemical industries for controlling the medium circulation in a pipeline. The stop valve is designed aiming to solve the problems of short corrugated pipe, small expansion coefficient, easy damage and medium leakage of the prior stop valve for the corrugated pipe. The stop valve comprises a valve body, a valve cap, a valve flap, an upper valve rod, a lower valve rod, a packing material, a stuffing box, a corrugated pipe and a hand wheel, wherein, the valve cap is lengthened, the lengthened valve cap is welded together with the valve body to form a longer inner cavity, the lengthened corrugated pipe is installed in the inner cavity, the lower valve rod is installed in the corrugated pipe, the lower end of the corrugated pipe is seal welded to the lower end of the lower valve rod, and the upper end of the corrugated pipe is seal welded to the stuffing box. The utility model has the advantages that the expansion coefficient of the corrugated pipe is high, the fracture is not easy to occur and the service life is long; and the stop valve not only prevents the upper part of the lower valve rod from leaking, but also eliminates the leakage at the middle part of the lower valve rod, realizes the zero leakage and achieves the purposes of safe fire protection and explosion protection.

Description

A kind of bellows stop valve

Technical field:

The utility model relates to a kind of device that is used for oil, the circulation of chemical industry controlling plumbing fixtures medium.

Background technique:

Existing bellows stop valve is not because valve gap has inner chamber, and bellows only is contained in the body cavity, so bellows is short, joint number is few, and expansion coefficient is little, and is fragile, causes dielectric leakage; And valve rod top and the also easily leakage of valve body middle part, the easy breaking out of fire of inflammable and explosive medium or the blast of leakage.

Summary of the invention:

Technical problem to be solved in the utility model provides that a kind of bellows is not fragile, long service life, and medium is difficult for leaking bellows stop valve safe in utilization.

The purpose of this utility model is achieved in that same as the prior art is that it comprises valve body, valve gap is housed on the valve body, flap be contained in lower valve rod the lower end and with valve body sealing surface contact seal, filler is contained in the stuffing box, upper valve rod is contained in the top of valve gap, connect with splitting guide plate between the upper and lower valve rod, handwheel is contained on the upper valve rod; Different is, we extend valve gap, form an inner chamber, valve gap and the valve body that extends welded together, form long inner chamber jointly, thereby the length that adds lengthy bellows, increase joint number, bellows is contained in the inner chamber of valve body and valve gap composition, lower valve rod is contained in the bellows, bellows lower end and lower valve rod lower end welded seal, the upper end of bellows and stuffing box welded seal.

The utility model has the advantages that: be linked to be long inner chamber because valve gap lengthening forms inner chamber with body cavity, bellows is extended, joint number is many, so expansion coefficient is big, and easy-rupturing not in the reciprocal opening-closing process, long service life; Again because bellows lower end and lower valve rod lower end welded seal with the stuffing box welded seal, prevent that leaking from appearring in lower valve rod top on the bellows; Because valve body and valve gap weld together, eliminated the middle part and leaked again,, reached the explosion-proof purpose of fire safety so the utility model has been realized zero leakage.

Description of drawings:

Accompanying drawing is a structural representation of the present utility model.

Embodiment:

With reference to accompanying drawing, valve gap 2 is housed on the valve body 1, flap 3 be contained in lower valve rod 4 the lower end and with valve body 1 sealing surface contact seal, filler 5 is contained in the stuffing box 9, upper valve rod 8 is contained in the top of valve gap 2, connects with splitting guide plate 10 between the upper and lower valve rod, and handwheel 7 is contained on the upper valve rod 8; Valve gap 2 lengthenings form an inner chamber, the valve gap and the valve body of lengthening are welded together, the common inner chamber of forming one than length, bellows 6 is contained in the inner chamber of valve body 1 and valve gap 2 compositions, lower valve rod 4 is contained in the bellows, bellows 6 lower ends and lower valve rod 4 lower end welded seals, the upper end of bellows 6 and stuffing box 9 welded seals.

Claims

1, a kind of bellows stop valve, valve gap (2) is housed on the valve body (1), flap (3) be contained in lower valve rod (4) the lower end and with valve body (1) sealing surface contact seal, filler (5) is contained in the stuffing box (9), upper valve rod (8) is contained in the top of valve gap (2), connect with splitting guide plate (10) between the upper and lower valve rod, handwheel (7) is contained on the upper valve rod (8); It is characterized in that valve gap (2) lengthening forms an inner chamber, the valve gap and the valve body of lengthening are welded together, the common inner chamber of forming one than length, bellows (6) is contained in the inner chamber of valve body (1) and valve gap (2) composition, lower valve rod (4) is contained in the bellows, bellows (6) lower end and lower valve rod (4) lower end welded seal, the upper end of bellows (6) and stuffing box (9) welded seal.