CN2475885Y

CN2475885Y - Single surface sealing ball valve

Info

Publication number: CN2475885Y
Application number: CN 01211105
Authority: CN
Inventors: 张刚
Original assignee: Shanghai Hongsheng Special Valve Manufacturing Co ltd
Current assignee: Shanghai Hongsheng Special Valve Manufacturing Co ltd
Priority date: 2001-03-14
Filing date: 2001-03-14
Publication date: 2002-02-06
Anticipated expiration: 2011-03-14

Abstract

A single-side-sealed ball valve is provided. The valve includes a valve body, a valve base, a valve rod and a sphere connecting to the valve rod by a ball. A L-shaped float valve base is provided on the position where the valve body contacts to the sealing surface of the sphere. The bottom of the L-shaped float valve base is connected to the valve body by an elastic gasket and cooperates with a limited-location pressing bush. The positive seal and the reverse seal can be insured because of the improvement on the disadvantage of the orbit swing ball valve which cannot be sealed when the medium flow reversely.

Description

A kind of single face seal ball-valve

The utility model relates to a kind of ball valve, especially a kind of single face seal ball-valve.

In industrial processes, ball valve is rapid because of opening and closing, the breathing sealing surface does not have wearing and tearing, flow resistance is low, so be used widely.And, along with the development of China's oil and rock gas cause, a kind of novel ball valve---track-type swing ball valve has appearred, and this ball valve is applied in the petroleum and natural gas pipeline more and more.This ball valve has many advantages, but a structural fatal shortcoming is an one-way sealing, promptly in pipeline when MEDIA FLOW to flow to shown in the valve when consistent, valve can play good sealing effect, and MEDIA FLOW to flow to shown in the valve when opposite, valve then can not be realized effective sealing, often follows phenomenons such as leakage occur.The reason that causes leakage is, what this valve structurally adopted is fixed valve seat, thrust compressing spheroid when seal action mainly leans on media flow is near valve seat, produce certain seal pressure and realize, and when MEDIA FLOW to flow to shown in the valve when opposite, the thrust during media flow makes the direction of spheroid away from fixed valve base, normal this in the past, form the gap between spheroid and valve seat, tightness reduces, and occurs leakage phenomenon inevitably.

Figure 1 shows that the sectional view of prior art middle orbit formula swing spherical ball valve.The track-type swing spherical ball valve is mainly by valve body 1, spheroid 4, form by the valve rod 2 that ball 3 acts on mutually with spheroid 4, when MEDIA FLOW when consistent with direction shown in the ball valve, when flowing to left as shown in the figure, the thrust of media flow is pressed on the sealing surface 9 of spheroid on the fixed valve base 5, produce certain sealing and recently reach, and when MEDIA FLOW to the right the time, because the thrust of medium, spheroid 4 is pushed away sealing surface 9, can't produce enough seal pressures, do not reach sealing effect thereby make on the sealing surface.

In view of problems of the prior art, the purpose of this utility model provides a kind of single face seal ball-valve, and its valve seat improves at the deficiency of track-type swing ball valve, can prevent from effectively to leak.

To achieve these goals, the utility model comprises the spheroid that ball valve comprises valve body, valve seat, valve rod, is connected by ball with valve rod, with a L shape floating valve seat is set on the contacted valve body of the ball seal face position, establish a resilient pad between the base of L shape floating valve seat and the valve body, floating valve seat matches with a spacing gland.

Compared with prior art, the utility model has only been done architecture advances to the valve seat part of track-type swing spherical ball valve, to change floating structure into the valve seat that valve body is fixed, lower surface at valve seat is provided with a gland that cooperates with floating valve seat simultaneously, its forward sealing principle is constant, and when reverse, though the pressure of medium spheroid from sealing surface, but the thrust of media flow makes floating valve seat and sealing surface keep good face to contact, and reaches sealing effect.

Below, in conjunction with the accompanying drawings, by the detailed description to a preferred embodiment of the utility model, characteristic of the present utility model, advantage and purpose will be apparent.

Fig. 2 is an embodiment's of the utility model single face seal ball-valve a sectional view;

Fig. 3 is a utility model single face seal ball-valve embodiment's shown in Figure 2 partial section.

Please refer to structure shown in Figure 2, general configuration of the present utility model is similar to the track-type swing spherical ball valve.It is fixed valve base position at the swing type spherical ball valve, the structure that adopts L shape floating valve seat 10 to cooperate with L shape gland 6, one resilient pad 8 is set between the base of L shape floating valve seat 10 and the valve body 1, the another side of L shape floating valve seat 10 contacts with the horizontal plane of valve body 1, on this side L shape valve seat, some grooves are arranged, place seal ring 7 in the groove, its effect is to produce sealing between floating valve seat 10 and valve body 1.When the medium forward flow, be illustrated as left, sealing principle is same as above.When medium oppositely flowed to the right, though the pressure of medium pushes away sealing surface 9 to spheroid 4, because the position-limiting action of valve rod 2 is arranged, the reverse displacement to the right of spheroid 4 was very little.But this moment, on the one hand, the resilient pad 8 of compression between floating valve seat 10 and the valve body 1 promoted floating valve seat 10 displacement to the right, especially when pressure medium is low, mainly also can produce enough big seal pressure by this resilient pad concerning floating valve seat 10; On the other hand, the media flow active force promotes floating valve seat 10 to the right simultaneously, the effect of this both direction unanimity promotes floating valve seat 10 to spheroid 4, and the displacement that produces is bigger than spheroid 4 reverse displacement to the right, therefore, the pressure that fluid acts on the semifloating valve seat 10 can be pressed on semifloating valve seat 10 on the spheroid 4, thereby produces enough seal pressures, makes to keep good face to contact between floating valve seat 10 and the sealing surface 9 reaching sealing effect.Floating valve seat 10 lower ends are provided with a L shaped gland 6 and cooperatively interact with it, and an end of gland 6 can be fixing with valve body 1 by welding, by the maximum displacement of its long margin system floating valve seat 10.

Above in conjunction with a description that preferred embodiment is carried out the utility model of the present utility model, but those of ordinary skill in the art is appreciated that, in the utility model design scope, can also carry out multiple changes and improvements to above-mentioned preferred embodiment, will be understood that all conversion and improvement all should fall into the scope of appended claims.

Claims

1. single face seal ball-valve, the spheroid that described ball valve comprises valve body, valve seat, valve rod, is connected by ball with valve rod, it is characterized in that, be provided with a L shape floating valve seat with the contacted valve body of ball seal face position, the base of described L shape floating valve seat is connected with valve body by a resilient pad, and described floating valve seat matches with a spacing gland.

2. single face seal ball-valve according to claim 1 is characterized in that, described floating valve seat is provided with several grooves with the surface that described valve body directly contacts, and places seal ring in the groove.

3. single face seal ball-valve according to claim 1 and 2 is characterized in that, described gland one end and valve body are fixed.