CN2544149Y

CN2544149Y - Check switch valve

Info

Publication number: CN2544149Y
Application number: CN 02222835
Authority: CN
Inventors: 袁明刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-04
Filing date: 2002-06-04
Publication date: 2003-04-09
Anticipated expiration: 2012-06-04

Abstract

A check switching valve comprises a valve body, a valve core installed in the valve body to control the valve to open or close, an operation element that is coordinated with the valve core and a check mechanism positioned in the valve body which can be positioned either in the inlet section or in the outlet section. The valve is mainly used in gas pipe system, and can be used by being matched with gas facilities. Due to the check mechanism positioned in the valve body, fuel gas of the gas facilities can be opened or closed normally and air supply block caused by heterogeneous fluid in particular to water that enters gas transportation pipe through the valve can be effectively prevented.

Description

The non-return switch valve

One, technical field

The utility model belongs to the valve of control gaseous break-make, particularly a kind of switch valve with check function that is used on the fuel gas pipeline.

Two, background technique

Through understanding, the existing switch valve that is used on the fuel gas pipeline comprises ball valve (ball face sealing) and gate valve (plane sealing), and they all only have unlatching or closing function to combustion gas, and behind the valve opening, combustion gas can be through the valve two-way flow.Given this, to be connected with water pipe with the suction tude of gas facility if user or maintenance man are wrong when mounted, for example, the suction tude of water heater has been received on the outlet pipe, water will be along entering fuel gas transportation pipeline blocking-up source of the gas with the gas facility by switch valve during use.In case this situation occurs, the lighter causes the user of a certain unit all to stop the supple of gas or steam, and weight person can cause the user of entire building even whole sub-district all to stop the supple of gas or steam.And to recover normal air feed, and then must cut off tracheae, with dedicated pump water is pumped, so not only influence people's normal life and work, but also can cause no small economic loss.

Three, summary of the invention

The utility model provides a kind of non-return switch valve at the deficiency that prior art exists, and this kind valve can be blocked the path that foreign peoples's fluid, particularly water enter gas pipeline automatically when opening state.

The technical solution of the utility model is: set up non-return mechanism in the valve body of existing switch valve.This non-return mechanism both can be arranged on the air inlet section of valve body, also can be arranged on the section of giving vent to anger of valve body.Because existing switch valve has ball valve and two kinds of fundamental types of gate valve, thereby the non-return switch valve that the utility model provides also has two types.

First type is to set up non-return mechanism on the basis of ball valve, and in this type, the spool that control valve is opened or closed is the ball face sealing spool, and this spool and the valve seat that is complementary with it constitute the ball face sealing pair; Non-return mechanism is plane sealing valve seat and the plane sealing pair that constitutes with the plane sealing spool of its coupling.

Second type is to set up non-return mechanism on the basis of gate valve.In this type, the spool that control valve is opened or closed is the plane sealing spool, mainly is made up of with the valve rod that is connected with valve block valve block, and the valve seat of this spool and its coupling constitutes the plane sealing pair.The plane sealing auxiliary structure that non-return mechanism still will utilize control valve to open or close, in other words, above-mentioned plane sealing auxiliary structure is the element of non-return mechanism, sets up check spring on this basis and then forms non-return mechanism by the diversion cavity that valve body forms; Check spring is sleeved on the valve rod in the plane sealing pair, its precompressed adjusted value is determined according to the working pressure of combustion gas, so that when valve is in opening state, the valve block of forming spool in the plane sealing pair was pasted mutually with valve seat, combustion gas can be entered by valve use the gas facility; Valve seat in the plane sealing pair is positioned at the diversion cavity bottom, so that make the foreign peoples's fluid closing plane sealing pair that imports diversion cavity, blocks it enters gas pipeline by valve path.

The utlity model has following advantage and beneficial effect:

1, owing on the basis of existing switch valve, set up non-return mechanism, thereby can normally open or close combustion gas, can prevent effectively that again foreign peoples's fluid, particularly water from entering the source of the gas blocking-up that fuel gas transportation pipeline causes by valve with the gas facility.

2, simple in structure, be easy to make.

Four, description of drawings

Fig. 1 is a kind of structural drawing according to non-return switch valve provided by the utility model, and this valve is in opening state;

Fig. 2 is the structural drawing that the non-return switch valve among Fig. 1 is in closed condition;

Fig. 3 is another structural drawing according to non-return switch valve provided by the utility model.

Five, embodiment

Embodiment 1:

The structure of the non-return switch valve in the present embodiment as shown in Figure 1 and Figure 2, on the basis of existing switching ball, set up non-return mechanism, mainly by valve body 1, be installed in valve body inner control opening of valves or the spool 3 of closing, form with the control member 2 of spool 3 assembly and the non-return mechanism that is arranged on valve body air inlet section.Valve body 1 is threaded by two sections tubulose class A of geometric unitA and forms, and body cavity is provided with the ball face sealing valve seat 4 that the spool 3 of opening or closing with control valve is complementary; The spool 3 that control valve is opened or closed is the ball face sealing spool, and the valve seat 4 that this spool is complementary with it constitutes ball and sealing pair; With the control member 2 of spool 3 assembly be rocking bar, this rocking bar is connected with the threaded stem of forming spool 3; Non-return mechanism is a plane sealing pair, and its valve seat 5 is installed in the air inlet section of valve body, is threaded with valve body 1, and its spool 6 is combined with valve seat 5.During use, the inlet end of this non-return switch valve connects source of the gas by pipe fitting, the outlet side connects by pipe fitting and uses the gas facility, if water is through entering the non-return switch valve with the gas facility, as shown in Figure 1 and Figure 2, be arranged on non-return mechanism on the valve body air inlet section and will block the path of water, prevent that it from entering the combustion gas gas pipeline.

Embodiment 2:

The structure of the non-return switch valve in the present embodiment has been set up non-return mechanism as shown in Figure 3 on the basis of existing switch gate valve.Difference from Example 1 is: 1, the control valve spool 3 of opening or closing and be arranged on body cavity and the valve seat of this spool coupling 4 formation plane sealing pairs, and spool 3 mainly is made up of with the valve rod 10 that is connected with valve block valve block 11; 2, be swing arm with the control member 2 of spool 3 assembly, this swing arm be installed on the valve body by coupling head 9 and with valve rod 10 suits of composition spool 3; 3, the non-return mechanism plane sealing pair of opening or closing by control valve, be sleeved on the check spring 8 on the valve rod 10 in the plane sealing pair and form by the diversion cavity 7 that valve body forms, the plane sealing pair is positioned at bottom the diversion cavity; 4, valve body 1 is an overall structure.

The utility model on being applied in fuel gas pipeline, also can be widely used on the similar fluid circuit.

Claims

1, a kind of non-return switch valve, comprise valve body (1), be installed in valve body inner control opening of valves or the spool (3) of closing, be arranged on body cavity and this spool coupling valve seat (4) and with the control member (2) of this spool assembly, it is characterized in that also being provided with in the valve body non-return mechanism.

2, non-return switch valve according to claim 1 is characterized in that:

1) the control valve spool (3) of opening or closing be the ball face sealing spool, this spool and valve seat (4) the formation ball face sealing pair that is complementary with it,

2) non-return mechanism is plane sealing valve seat (5) and the plane sealing pair that constitutes with the plane sealing spool (6) of its coupling.

3, non-return switch valve according to claim 2 is characterized in that the control member (2) of spool (3) assembly of opening or closing with control valve is a rocking bar.

4, non-return switch valve according to claim 1 is characterized in that:

1) the control valve spool (3) of opening or closing be the plane sealing spool, mainly form with the valve rod that is connected with valve block (10) by valve block (11), this spool and with valve seat (4) the formation plane sealing pair of its coupling,

2) the non-return mechanism plane sealing pair of opening or closing by control valve, be sleeved on the check spring (8) on the valve rod (10) in the plane sealing pair and the diversion cavity (7) that formed by valve body is formed.

5, non-return switch valve according to claim 4 is characterized in that the control member (2) of spool (3) assembly of opening or closing with control valve is a swing arm.