CN2130977Y

CN2130977Y - Wedge-shaped gate valve capable of auto-regulating levels of two gate plates

Info

Publication number: CN2130977Y
Application number: CN 92214821
Authority: CN
Inventors: 李鹏程; 曾素华
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-16
Filing date: 1992-06-16
Publication date: 1993-04-28
Anticipated expiration: 2002-06-16

Abstract

The utility model relates to a wedge-shaped gate valve capable of auto-regulating levels of two flashboards, comprising a hand wheel, a valve cap nut, a valve rod, a valve cover, and a valve body. The key point of the gate valve lies in that the flashboards with a concave surface and a convex surface can achieve the on-off of a valve, and the flashboards are arranged at the inner cavity of the valve body 5. Since two flashboards can rotate relatively and automatically regulate levels under the action of the valve rod, the angle error caused in the manufacture of the wedge angles of the flashboards and the sealing surface of a valve seat can be efficiently eliminated. The abrasion of the sealing surface in the course of using the valve gate can be efficiently compensated, the reliable seal can be achieved, and the problems of oil-leakage and gas leakage of the gate valve are eliminated.

Description

Wedge-shaped gate valve capable of auto-regulating levels of two gate plates

The utility model relates to the automatic leveling double-flashboard gate valve of a kind of wedge-type.

As everyone knows, existing wedge-type elasticity Single disc gate valve, mainly form by valve body, valve gap, flashboard, Stem Mut, valve rod, Gland, handwheel, bolt, filler (oil immersion asbestos packing), valve body is a cast steel, it is 5 ° valve seat that an angle of wedge respectively is equipped with on the both sides of valve body, flashboard has an angle of wedge, and monolateral 5 °, the degree of agreement whether sealing of valve inserts sealing surface of seat by the stressed back of flashboard fully decides.When cut-off valve, need pull the handwheel rotation, so that moment of torsion is passed to Stem Mut by the key on the Stem Mut, drive it rotates thereupon, move downward thereby drive valve rod, the flashboard that is connected stem lower portion also moves downward thereupon, coincide up to flashboard and valve seat, nonetheless, still can not reach the purpose of sealing fully, also must strengthen strength, pull handwheel, make flashboard continue to move downward, force flashboard to produce a micro-deformation, because of the angular error that processing is produced, flashboard and valve seat are fitted like a glove with compensation, realize sealing, and then reach the purpose of cutting off medium.In fact, when using under the various working condition, owing to temperature, the turbidity test of medium, the influence of factors such as environment, existing product is difficult to reach sealing and does not leak, and is when especially using on gas pipeline, just more difficult.In addition, existing wedge-type elasticity Single disc gate valve, the accuracy of manufacturing height, according to standard code, the degree of finish of flashboard and sealing surface of seat is

, this just needs operations such as grinding, fine gtinding, polishing just can reach.Because when this valve cut out, outer pressure guaranteed that flashboard inserts in the valve seat, can produce very big wedging power at valve base surface, the relative friction between sealing surface is easy to abrade the sealing surface of flashboard and valve seat, leak thereby produce, cause poor sealing, working life is short.In addition, the impurity in the using process medium also abrades sealing surface easily, repair 0.2 to the sealing surface that has abraded, at the scene and the user be difficult to accomplish, so inconvenient maintenance.If existing gate valve is in closed condition for a long time, much bigger when then the opening force moment ratio is closed in the time of opening again, therefore use inconvenience.

It is a kind of simple in structure that the purpose of this utility model is to provide, and switch moment is little, the automatic leveling double-flashboard gate valve of reliable sealing wedge-type.

The purpose of this utility model is to realize like this, that is: the automatic leveling double-flashboard gate valve of this wedge-type is the improvement on former wedge-type elasticity single valve plate gate valve basis, it comprises handwheel, bonnet nut, valve rod, valve gap and valve body, its key be one be contained in body cavity can be with valve rod up and down with the concave, convex face flashboard of the break-make that realizes valve.

The R radius of described concave surface flashboard is greater than the R radius of convex surface flashboard, and the sealing surface of concave, convex face flashboard is with 507 welding rod built-up welding, and sealing surface degree of finish is

The utility model compared with prior art, but because concave, convex face flashboard relative movement under the effect of valve rod, automatically leveling so can eliminate the angular error that the angle of wedge of the sealing surface of flashboard and valve seat produces effectively in manufacture process, reduces the required precision of its processing, make it easily manufactured, also the wearing and tearing of compensating sealing surface effectively improve the durability of its use, have stopped leakage of oil, leak gas or scurried the wet goods phenomenon, it is flexible to have switch in addition, the little characteristics of required keying moment.

Accompanying drawing is a general structure schematic representation of the present utility model.

Below with reference to accompanying drawing concrete structure of the present utility model and working condition are further described.

Referring to accompanying drawing, the automatic leveling double-flashboard gate valve of the utility model wedge-type is by valve body 5, be contained in the concave,

convex face flashboard

6,7 of its inner chamber, by flange plate 8 and bolt and valve body 5 joining valve gaps 4, one end is clamped by concave, convex face flashboard, the other end and Stem Mut 2 joining valve rods 3 are formed by key and the joining handwheel 1 of Stem Mut.The angle of wedge of the sealing surface of valve seat and concave, convex face flashboard matches, and generally be advisable with 5 °, and equal built-up welding has 507 welding rods on its sealing surface, through retrofit, surface finishment is reached

, the Rockwell hardness of flashboard sealing surface generally is advisable for low 5 ° than the Rockwell hardness of sealing surface of seat.As long as turn clockwise handwheel, just it is downward to order about valve rod, and then drives and to make concave, convex face flashboard downward, and make its automatic leveling, thereby reach the purpose of reliable sealing.

As long as the utility model selects for use different materials just can be widely used in the pipeline of carrying all gases, liquid medium.

Claims

1, the automatic leveling double-flashboard gate valve of a kind of wedge-type comprises handwheel, bonnet nut, valve rod, valve gap, valve body, it is characterized in that one be contained in valve body 5 inner chambers, can be with valve rod up and down with the concave, convex face flashboard 6,7 of the break-make that realizes valve.

2,, it is characterized in that the R radius of the R radius of concave surface flashboard greater than the convex surface flashboard according to the automatic leveling double-flashboard gate valve of the described wedge-type of claim 1.