CN2573792Y

CN2573792Y - High-pressure double seal stop valve

Info

Publication number: CN2573792Y
Application number: CN 02276349
Authority: CN
Inventors: 张明兴
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-03
Filing date: 2002-09-03
Publication date: 2003-09-17
Anticipated expiration: 2012-09-03

Abstract

The utility model provides a high-pressure double seal stop valve, which is mainly composed of a valve body, a valve cover and a valve rod. A raised head of a valve clack is extruded and assembled in a concave hole of the valve rod, a valve seat is combined and assembled in the valve body, and the top part of the valve seat is provided with a conical convex ring body. The conical convex ring body and a polyphenyl ester sealed gasket are formed into flexible seal, and the conical surface of the conical convex ring body and the inner ring edge angle of a hole cavity of the valve clack are formed into hard seal. The utility model is characterized in that the valve seat provided with a rigid sealing surface and the valve clack are separated to singly make into unit parts and then assembled into the combined valve body and the valve rod. The requirement of the high-accuracy quality of the valve seat and the valve clack can be ensured, and manufacturing difficulty is reduced. The valve seat and the valve clack as wearing consumption unit parts can be singly replaced, the reliable performance of seal is ensured, and the service life of the valve is effectively prolonged.

Description

The high pressure double-sealed stop valve

Technical field:

The utility model relates to the stop valve that a kind of pilot line is opened or closed, specifically a kind of high pressure double-sealed stop valve.

Background technique:

We know: in industry, agricultural, oil, in numerous production fields such as chemical industry, stop valve is to use the most a kind of valve series products, traditional stop valve is mainly by having done into, go out the valve body of pipe, valve gap, valve rod and stuffing box that handle is installed constitute, handle with sleeve is mentioned or is depressed valve rod, make the flap closure or openness valve pocket of doing on the valve rod, realize the purpose of pilot line closure or openness, prevent the seepage of medium in the pipeline by the preload pressure of stuffing box, the sealability of stuffing box directly influences the operating life of stop valve, in the course of the work, stuffing box should bear reciprocating mechanical wear, bear washing away and chemical erosion of the interior high-speed motion medium of pipeline again, its work condition environment is very abominable, the stop valve that particularly in high-pressure duct system, uses, the working environment of stuffing box is more abominable, stuffing box also will bear the strong extruding of high-pressure medium, having aggravated the mechanical friction wearing and tearing to stuffing box greatly, is to have the stop valve that uses now to damage the main cause of scrapping in high pressure pipe system because the mechanical friction of stuffing box wearing and tearing cause seal failure.Recently, the valve production industry has been released the double-sealing technology of soft or hard two seals, it is on the basis that keeps traditional soft sealing that is made of seal washer, between valve base, set up rigid seal again at flap, this soft or hard double-sealing technology is to improving the sealability of valve, the Acceptable life that prolongs valve has positive role, but the technical requirements of this soft or hard double-sealing processes the difficult mill of hard in narrow valve body, the rigidity hard sealing surface that surface accuracy is high, the manufacturing and detection difficulty are very big, manufacture process requirement is high, cost of production also sharply rises, in the actual production manufacture process, because manufacturing and detection difficulty are very big, in fact this class valve in actual use, the soft or hard two seals is difficult to play simultaneously seal action sometimes, make this soft or hard double-sealing technology really play the function of double-sealing simultaneously, and can in the valve series products, promote the use of at large, must improve manufacturing process from structure, reduce the difficulty and the actual detected difficulty of machining, can guarantee that just the soft or hard two seals really can play seal action simultaneously, produce low cost of manufacture, the quality height, the double-sealed stop valve truly of long service life satisfies Subscriber Unit to the high-quality requirement of valve series products.

Summary of the invention:

The utility model is to propose a kind of manufacturing process that improves hard seal combination structure on the basis of existing technology, the valve seat that is provided with hard rigid seal face and flap are separated from valve body and valve rod respectively be processed into assembly of elements separately, refill the high pressure double-sealed stop valve that is made into combined type valve body and valve rod, it can reduce the difficulty of machining, detection greatly, can reduce the manufacturing cost of hard sealing greatly, it is reliable and stable to guarantee that the soft or hard two seals really can play the effect and the sealability of double-sealing simultaneously.The said high pressure double-sealed stop valve of the utility model, it is mainly by valve body, be fitted to the valve gap on the valve body, bonnet nut constitutes with the valve rod that is installed with handle, the one group of packing ring that is set in valve rod is press-fited in valve gap by Stem Mut, the plush copper extruding that it is characterized in that doing at the flap top is fitted in the shrinkage pool that stem bottom does, device has polyphenyl fat sealing gasket in the vestibule that do the flap bottom, connect combination at the valve body internal thread and be fitted with valve seat, be provided with the circular cone convex ring body at the opposite position place of the top of valve seat and the flap of device polyphenyl fat sealing gasket.The polyphenyl fat sealing gasket of the circular cone convex ring body that the top of valve seat is provided with in being installed on the flap vestibule constitutes soft sealing; The conical surface of circular cone convex ring body constitutes the hard sealing with the interior ring corner angle of flap vestibule.Because valve seat and flap are to separate independent manufacturing processing respectively from valve body and valve rod, with regard to mechanical processing technique and detection means, all be easy to guarantee to reach the high-precision requirement of valve seat and flap, and greatly reduce the difficulty of the manufacturing, the valve seat and the flap that are provided with hard rigid seal face consume single-piece as the wearing and tearing rapid wear, when sealability decline in use occurring, only need replacing valve seat and flap to get final product, and whole stop valve do not scrapped, reduce operating cost greatly.

Description of drawings:

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

Fig. 2 is a double sealing structure partial enlarged drawing of the present utility model.

Embodiment:

The high pressure double-sealed stop valve that the utility model proposes, it is mainly by valve body 1, be fitted to the valve gap 6 on the valve body 1, bonnet nut 7 and constitute by the valve rod 11 that bolt 9 is installed with handle 10, the one group of packing ring 5 that is set in valve rod 11 is press-fited in valve gap 6 by Stem Mut 8, the plush copper 4 that do at flap 3 tops is fixedly to be fitted in the shrinkage pool of doing valve rod 11 bottoms 14 with the cold hobbing mode, the internal projecting ring limit 16 that do in the aperture of shrinkage pool 14 is stuck in the necking down 17 under the plush copper 4 of flap 3, device has polyphenyl fat sealing gasket 2 in the vestibule 15 that do flap 3 bottoms, connect combination at valve body 1 internal thread and be fitted with valve seat 12, pad is equipped with polytetrafluoroethylsealed sealed pad 13 between valve seat 12 and the valve body 1, opposite position place at the top of valve seat 12 and the flap 3 of device polyphenyl fat sealing gasket 2 is provided with circular cone convex ring body 19, the circular cone convex ring body 19 that the top of valve seat 12 is provided with is after the mode of employing built-up welding is piled into, again through heat treatment, the cone shape that tapering is 60 degree is processed in machine cut, and the polyphenyl fat sealing gasket 2 of the vertex of a cone bulge loop 21 of circular cone convex ring body 19 in being installed on flap 3 vestibules 15 constitutes soft sealing; The cone face 20 of circular cone convex ring body 19 constitutes the hard sealing with the interior ring corner angle 18 of flap 3 vestibules 15, because valve seat 12 and flap 3 are to separate independent manufacturing processing respectively from valve body 1 and valve rod 11, with regard to mechanical processing technique and inspection means, all be easy to guarantee to reach valve seat 12 and flap 3 high-precision requirements, greatly reduce the difficulty of making and detecting, the valve seat 12 and the flap 3 that are provided with hard rigid seal face consume single-piece as the wearing and tearing rapid wear, in use if sealability when descending, can change valve seat 12 and flap 3 at any time, and can not cause whole stop valve to scrap, prolong working life effectively, can reduce operating cost greatly.

Claims

1. high pressure double-sealed stop valve, it is mainly by valve body (1), be fitted to the valve gap (6) on the valve body (1), bonnet nut (7) and the valve rod (11) that is installed with handle (10) constitute, the one group of packing ring (5) that is set in valve rod (11) is press-fited in valve gap (6) by Stem Mut (8), it is characterized in that plush copper (4) extruding of doing at flap (3) top is fitted in the shrinkage pool of doing valve rod (11) bottom (14), device has polyphenyl fat sealing gasket (2) in the vestibule (15) that do flap (3) bottom, connect combination at valve body (1) internal thread and be fitted with valve seat (12), be provided with circular cone convex ring body (19) at the opposite position place of the top of valve seat (12) and the flap (3) of device polyphenyl fat sealing gasket (2).