CN2048542U

CN2048542U - Stop valve

Info

Publication number: CN2048542U
Application number: CN 89203335
Authority: CN
Inventors: 叶春年
Original assignee: BAOYI LIQUIFIED GAS VALVE FACTORY YONGJIA COUNTY ZHEJIANG PROV
Current assignee: BAOYI LIQUIFIED GAS VALVE FACTORY YONGJIA COUNTY ZHEJIANG PROV
Priority date: 1989-03-21
Filing date: 1989-03-21
Publication date: 1989-11-29

Abstract

The utility model discloses a stop valve used for industry, comprising a valve body, a valve cover, a valve flap, a valve stem, a sealing component, a sealing fixing component a controlling component, etc. A guiding convex block (A) is arranged on the valve body, and a guiding plane (B) is arranged on the valve flap. When the valve stem rotates and moves, the valve flap can move but not rotate, so that the phenomenon of abrasion on a sealing pair basically does not occur at the process of closing a valve gate, the severe wear of the sealing pair caused by the engagement and the erosion of the joint of the valve flap and a valve stem can be avoided, and the service life of the valve gate is prolonged.

Description

Stop valve

The utility model relates to a kind of industrial stop valve.

Stop valve is to be installed on the usefulness of making to open and close medium on the pipeline, with the Placement of pipeline internal thread, outside thread, flange, welding etc. are arranged, structure includes valve body, valve gap, flap, valve rod, Sealing (as polytetrafluoroethylene packing), sealing fixture (as Gland, gland nut) and operator (as handwheel or handle) etc., by rotating operator, driving valve rod rotates and moves up and down, valve rod drives flap and moves up and down, and reaches the purpose that opens and closes medium.Sealability after flap sealing surface and valve body sealing surface compress is the important performance indexes of valve, and its quality is directly connected to the quality and the working life of valve.In the valve using process, the wearing and tearing of sealing surface can make sealability become bad, affect the working life of valve.For reducing the wearing and tearing in the using process, usually the flap and the valve body of stop valve are made disome, become revolute pair to connect, but this wearing and tearing still exist, when flap and generation corrosion of valve rod joint or interlock clamping stagnation, it is just quite serious to wear and tear, and has a strong impact on the working life of valve.In addition, when valve opening, flap can rotate with the rotation of valve rod, and when closing again, flap and valve body produce displacement, have quickened wearing and tearing, and the sealing pair Percent of contact area is descended, and it is bad that sealability becomes, and affects the working life of valve equally.

The purpose of this utility model provides a kind of stop valve of long service life.

The utility model comprises valve body (1), valve gap (4), valve rod (3), flap (2), Sealing, sealing fixture, operator, flap (2) is made disome with valve rod (3), become revolute pair to connect, valve body (1) and flap (2) be corresponding to be provided with or to be shaped on restriction flap (2) and valve body (1) guide structure in relative rotation, make valve rod (3) rotate and move up and down, flap (2) only can move up and down.Guide structure can be realized like this: valve body (1) is a guiding projection (A), and flap (2) is guide surface (B), guide surface (B) and flap (2) parallel axes; Or valve body is guiding projection, and flap is a guiding groove, and projection matches with groove; Or valve body is guiding groove, is equipped with feather key on the flap.Valve body is guiding projection (A), and when flap was guide surface (B), guiding projection (A) and guide surface (B) can respectively be two places, is symmetrically distributed respectively, and guiding projection (A) can be made one with valve body (1), adopts essence to cast type.The material of valve body (1) can be stainless steel, as ZG1Cr 18 Ni, 9 Ti or ZGCr18Ni12 Mo2Ti etc.

The utility model valve body and flap correspondence are provided with or are shaped on and limit the guide structure that the two rotates, make flap when closing, flap and valve seal pair do not produce wear phenomenon substantially, flap is in the switching process, the sealing pair relative position remains unchanged, and has improved the Percent of contact area of sealing pair, favorable sealing property, valve is compared with existing stop valve working life, prolongs greatly.Guide structure is guiding projection (A) on the valve body, adopts smart casting to make one with valve body (1), and guide structure is guide surface (B) on the flap, thereby has reduced the manufacture cost of valve.

Fig. 1 is the utility model embodiment sectional view;

Fig. 2 is the utility model embodiment A-A sectional view;

Fig. 3 is the utility model Embodiment B-B sectional view.

Among the embodiment, Sealing is polytetrafluoroethylene packing (5), operator is handwheel (9), sealing fixture comprises filler gland (6), Stem Mut (7), locking nut (8), Stem Mut (7) is fixedlyed connected with valve gap (4) screw thread, and with valve rod (3) screw thread transmission, filler gland (6) is shaped on help to shoulder heavy thing (C), valve gap (4) is shaped on hole (D), is convenient to change filler.The valve body material is ZG1Cr18Ni9Ti, adopts smart cast to become guiding projection (A), and valve body (1) is connected with the flange that is connected to of pipeline.

Claims

1, a kind of stop valve, comprise valve body (1), valve gap (4), flap (2), valve rod (3), Sealing, sealing fixture, operator, flap (2) is made disome with valve rod (3), become revolute pair to connect, it is characterized in that valve body (1) and flap (2) correspondence arrange or be shaped on restriction flap (2) and valve body (1) guide structure in relative rotation.

2, valve according to claim 1 is characterized in that described guide structure, and valve body (1) is gone up and is that it is guide surface (B) that guiding projection (A), flap (2) are gone up.

3, valve according to claim 2 is characterized in that it respectively is two places that valve body (1) guiding projection (A) and flap (2) are gone up guide surface (B), is symmetrically distributed respectively.

4, according to claim 2 or 3 described valves, it is characterized in that valve body (1) guiding projection (A) and valve body (1) make one, essence is cast type.