CN204805656U - Valve is diffused to gas pipeline safety - Google Patents

Abstract

The utility model discloses a valve is diffused to gas pipeline safety, including valve body, valve gap, diaphragm, load dish, stifle, spring, pressure adjusting screw, the valve body is bowl form component, and there is the air inlet in bead department for the flange on the lateral wall, and the inner chamber has the drum structure, and the drum wall is valve port, internal chamber of hole junction valve and export with diaphragm contact department, valve gap one end is the flange, and the other end is the screw hole, flexible diaphragm presss from both sides the dress between valve body and valve gap, the spiral -lock has the load dish in band -pass hole on the diaphragm, the spring force can be adjusted by pressure adjusting screw on being used in the load dish, stifle and sealing washer can seal and prevent that the foreign matter gets into. During the use, the air inlet connects by the protection pipeline, and the export communicates with each other with the atmosphere, exceed predeterminedly when diffusing pressure as line pressure, diffuse the valve and open, the pipeline pressure release, drop to when diffusing pressure as line pressure, diffuse the valve and close. The utility model discloses the reaction is sensitive, diffuse fast, the precision is high, through the test, the speed of diffusing improves 70%, and the precision is superior to 3%.

Description

A kind of fuel gas pipeline Safety relief valve

Technical field

The utility model belongs to gas transmission and distribution technical field, is specifically related to a kind of fuel gas pipeline Safety relief valve.

Background technique

In the transmission & distribution process of pipeline gas, when the downstream no user use combustion gas of pressure governor, then pressure governor can cut out automatically, and making by the gas flow of pressure governor is zero, and now, the downstream pipe of pressure governor is in air-tight state; Under this sealing state, if there is rising in the ambient temperature around downstream pipe or pressure governor leaks between upstream and downstream, then the pressure of downstream pipe can constantly raise, thus the safety of the gas equipment on downstream pipe is on the hazard, for this reason, need after pressure increase to certain value, to carry out automatic relief to the combustion gas of downstream pipe, to maintain the pressure of downstream pipe within safety range.

Summary of the invention

For above-mentioned situation, the purpose of this utility model is to provide simple, with low cost, the sensitive fuel gas pipeline Safety relief valve of a kind of structure.

For achieving the above object, the utility model by the following technical solutions:

A kind of fuel gas pipeline Safety relief valve, it comprises valve body, valve gap, diaphragm, force bearing disk, stifle, spring, tension adjusting screw; Described valve body is circular bowl structure, its bead place is flange arrangement, within it there is a cylindrical structure bottom in chamber along shaft axis, one end by body cavity on cylindrical wall is shaped with valve mouth structure, it is a through hole in cylinder, its one end is connected with body cavity, and the other end is connected with the external world as outlet, and its inner space is outlet plenum; The sidewall of valve body is provided with suction port; One end of described valve gap is disc-shaped structure, and its bead place is the flange arrangement matched with valve body, and its other end is interior threaded hole structure, and disk and interior threaded hole structure are on the same axis; Described diaphragm is flexible disc-shaped component, is installed between valve body and the flange of valve gap; A back pressure cavity is formed between diaphragm and valve gap; Side spiral-lock relative with valve port on diaphragm has a circular force bearing disk, makes diaphragm between force bearing disk and valve port; Being connected firmly and sealing between force bearing disk and diaphragm; Apply a suitable active force at the center of force bearing disk to valve port direction and just can cut off runner between diaphragm and valve port, thus make the inner chamber of valve body be in air-tight state; At the tubular structure having a projection towards outlet side on the central position of described force bearing disk, the through hole on tubular structure can make mutual UNICOM between outlet plenum and back pressure cavity; Outside thread on described tension adjusting screw and the internal thread on valve gap match, and are installed on valve gap, and rotary pressure adjusting screw can make it move up and down on valve gap; Tension adjusting screw is provided with location hole of the spring towards the side of force bearing disk, spring by location and installation between tension adjusting screw and force bearing disk; Rotary pressure adjusting screw can the decrement of Regulation spring, thus the size of Regulation spring power; Tapped hole port outside valve gap is provided with a stifle in case foreign matter enters, is sealed by seal ring between valve gap and stifle.

The working principle of diffusion valve is: when body cavity does not have hydrodynamic pressure, the spring between tension adjusting screw and force bearing disk produce spring-force driven dual on force bearing disk, diaphragm is pushed to valve port, makes diaphragm be close to valve port; When body cavity has certain hydrodynamic pressure time, the fluid force that this fluid pressure action produces on diaphragm, makes diaphragm have the trend departing from valve port; Under the acting in conjunction of spring force and fluid force, between diaphragm and valve port, produce a sealing force; The spring force of diffusion valve is once set up, and the size of sealing force just depends on and the size of fluid force namely depends on the hydrodynamic pressure of body cavity: the hydrodynamic pressure of body cavity is larger, sealing force is less, otherwise the hydrodynamic pressure of body cavity is less, and sealing force is larger; When the hydrodynamic pressure of body cavity is less, when sealing force is greater than the minimum sealing force that can keep valve port sealing state, diffusion valve is just in closed condition; When the hydrodynamic pressure of body cavity rises gradually, fluid force can become large gradually, and sealing force will reduce gradually, and when sealing force is less than the minimum sealing force that can keep valve port sealing state, diffusion valve is just opened; Along with the unlatching of diffusion valve, the fluid of body cavity is just outwards discharged by outlet plenum; In the process of discharge, due to the Venturi effect that the liquid speed around the tubular structure on force bearing disk produces, make back pressure cavity produce a negative pressure, thus the runner between valve port and diaphragm is increased rapidly, ensure that diffusion valve is quick on the draw; Along with fluid constantly outwards discharges, the hydrodynamic pressure of body cavity declines gradually, and the flow of discharge reduces gradually, and the liquid speed around tubular structure reduces, and the negative pressure of back pressure cavity reduces, and the runner between valve port with diaphragm reduces rapidly until diaphragm contacts with valve port; When sealing force between diaphragm and valve port increases to more than the minimum sealing force that can keep valve port sealing state gradually, diffusion valve is just closed again; Make diffusion valve start open fluid pressure value be exactly diffusion valve diffuse pressure; The size of Regulation spring power just can regulate the size of diffusing force value.

During actual use, suction port connects protected pipeline, and outlet plenum connection is specifically diffused pipeline or is directly connected with air, rotary pressure adjusting screw, and what make diffusion valve diffuses the safety margins pressure that pressure is protected pipeline; Time more than the pressure increase in protected pipeline to safety margins pressure, diffusion valve is just opened, fluid in protected pipeline just by the runner between valve port and diaphragm to specifically diffusing pipeline or directly to airborne release, make the pressure drop in protected pipeline, reach the object of safety protection; Time below the pressure drop in protected pipeline to safety margins pressure, diffusion valve is just closed automatically.

The utility model beneficial effect is: structure is simple, and processing, installation, maintenance are convenient, are most importantly quick on the draw, and speed of diffusing is fast, it is high to diffuse precision; Through actual use test, the speed of diffusing can improve 70%, diffuse precision be better than ± 3%.

Accompanying drawing explanation

Fig. 1 is the utility model structural representation

In figure, 1-valve body, 2-valve gap, 3-diaphragm, 4-force bearing disk, 5-stifle, 6-spring, 7-tension adjusting screw, 8-seal ring.

Embodiment

Composition graphs 1 is described as follows embodiment of the present utility model:

A kind of fuel gas pipeline Safety relief valve, it comprises valve body 1, valve gap 2, diaphragm 3, force bearing disk 4, stifle 5, spring 6, tension adjusting screw 7; Described valve body 1 is circular bowl structure, its bead place is flange arrangement, within it there is a cylindrical structure bottom in chamber along shaft axis, one end by valve body 1 inner chamber on cylindrical wall is shaped with valve mouth structure, it is a through hole in cylinder, its one end and valve body 1 intracavity inter-connection, the other end is connected with the external world as outlet, and its inner space is outlet plenum; One end of described valve gap 2 is disc-shaped structure, and its bead place is the flange arrangement matched with valve body 1, and its other end is interior threaded hole structure, and disk and interior threaded hole structure are on the same axis; Described diaphragm 3 is flexible disc-shaped components, between the flange being installed in valve body 1 and valve gap 2, forms a back pressure cavity between diaphragm 3 and valve gap 2; Side spiral-lock relative with valve port on diaphragm 3 has a circular force bearing disk 4, being connected firmly and sealing between force bearing disk 4 and diaphragm 3; Apply a suitable active force at the center of force bearing disk 4 to valve port direction and just can cut off runner between diaphragm 3 and valve port, thus make the inner chamber of valve body 1 be in air-tight state; At the tubular structure having a projection towards outlet plenum side on the central position of force bearing disk 4, the through hole on tubular structure can make mutual UNICOM between outlet plenum and back pressure cavity; Outside thread on described tension adjusting screw 7 and the internal thread on valve gap 2 match, and are installed on valve gap 2, and rotary pressure adjusting screw 7 can make it move up and down on valve gap 2; Tension adjusting screw 7 is provided with location hole of the spring towards the side of force bearing disk, spring 6 by location and installation between tension adjusting screw 7 and force bearing disk 4; Rotary pressure adjusting screw 7 can the decrement of Regulation spring 6, thus the size of Regulation spring power T; Tapped hole port outside valve gap 2 is provided with a stifle 5 in case foreign matter enters, is sealed by seal ring 8 between valve gap 2 and stifle 5.

The working principle of diffusion valve is: when the inner chamber of valve body 1 does not have hydrodynamic pressure, the spring 6 between tension adjusting screw 7 and force bearing disk 4 produce spring force T act on force bearing disk 4, diaphragm 3 is pushed to valve port, makes diaphragm 3 be close to valve port; When diffusion valve inner chamber has certain hydrodynamic pressure time, the fluid force F that this fluid pressure action produces on diaphragm, makes diaphragm 3 have the trend departing from valve port; Under the acting in conjunction of spring force T and fluid force F, produce a sealing force between diaphragm 3 and valve port, its size is T-F; The spring force T of diffusion valve is once set up, and the size of sealing force just depends on and the size of fluid force F namely depends on the hydrodynamic pressure of valve body 1 inner chamber: the hydrodynamic pressure of valve body 1 inner chamber is larger, sealing force is less, otherwise the hydrodynamic pressure of valve body 1 inner chamber is less, and sealing force is larger; When the hydrodynamic pressure of valve body 1 inner chamber is less, when sealing force is greater than the minimum sealing force that can keep valve port sealing state, diffusion valve is just in closed condition; When the hydrodynamic pressure of valve body 1 inner chamber rises gradually, fluid force F can become large gradually, and sealing force will reduce gradually, and when sealing force is less than the minimum sealing force that can keep valve port sealing state, diffusion valve is just opened; Along with the unlatching of diffusion valve, the fluid of valve body 1 inner chamber is just outwards discharged by outlet plenum; In the process of discharge, due to the Venturi effect that the liquid speed around the tubular structure on force bearing disk 4 produces, make back pressure cavity produce a negative pressure, thus the runner between valve port and diaphragm is increased rapidly, ensure that diffusion valve is quick on the draw; Along with fluid constantly outwards discharges, the hydrodynamic pressure of valve body 1 inner chamber declines gradually, and the flow of discharge reduces gradually, and the liquid speed around tubular structure reduces, the negative pressure of back pressure cavity reduces, and the runner between valve port with diaphragm reduces rapidly until diaphragm contacts with valve port; When sealing force between diaphragm 3 and valve port increases to more than the minimum sealing force that can keep valve port sealing state gradually, diffusion valve is just closed again; Make diffusion valve start open fluid pressure value be exactly diffusion valve diffuse pressure; The size of Regulation spring power T just can regulate the size of diffusing force value.

During actual use, suction port connects protected pipeline, and outlet connects specifically diffuses pipeline or is directly connected with air, rotary pressure adjusting screw 7, and what make diffusion valve diffuses the safety margins pressure that pressure is protected pipeline; Time more than the pressure increase in protected pipeline to safety margins pressure, diffusion valve is just opened, fluid in protected pipeline just by valve port to specifically diffusing pipeline or directly to airborne release, making the pressure drop in protected pipeline, reach the object of safety protection; Time below the pressure drop in protected pipeline to safety margins pressure, diffusion valve is just closed automatically.

Claims (5)

1. a fuel gas pipeline Safety relief valve, it comprises valve body (1), valve gap (2), diaphragm (3), force bearing disk (4), stifle (5), spring (6), tension adjusting screw (7); It is characterized in that valve body (1) is for circular bowl structure, its bead place is flange arrangement, within it there is a cylindrical structure bottom in chamber along shaft axis, one end by valve body (1) inner chamber on cylindrical wall is shaped with valve mouth structure, it is a through hole in cylinder, its one end and valve body (1) intracavity inter-connection, the other end is connected with the external world as outlet; The sidewall of valve body (1) is provided with suction port; One end of valve gap (2) is disc-shaped structure, and its bead place is the flange arrangement matched with valve body (1), and its other end is interior threaded hole structure, and disk and interior threaded hole structure are on the same axis; Diaphragm (3) is flexible disc-shaped component, between the flange being installed in valve body (1) and valve gap (2); A circular force bearing disk (4) is had in the upper side spiral-lock relative with valve port of diaphragm (3); At the tubular structure having a projection towards outlet side on the central position of force bearing disk (4), tubular structure is shaped with a through hole.

2. the fuel gas pipeline Safety relief valve according to claims 1, it is characterized in that tension adjusting screw (7) is arranged on valve gap (2) by the outside thread matched with the internal thread on valve gap (2) on it, turning adjusting screw (7) can make it move up and down on valve gap (2); The center of tension adjusting screw (7) is being provided with a location hole of the spring towards the orientation of force bearing disk (4).

3. the fuel gas pipeline Safety relief valve according to claims 1 or 2, is characterized in that spring (6) by the positioning hole location and installation on tension adjusting screw (7) between tension adjusting screw (7) and force bearing disk (4).

4. the fuel gas pipeline Safety relief valve according to claims 1 or 2, is characterized in that being provided with a stifle (5) on the tapped hole port in valve gap (2) outside.

5. the fuel gas pipeline Safety relief valve according to claims 4, is characterized in that being provided with seal ring (8) between valve gap (2) and stifle (5).