CN107606260A - Fuel gas pipeline Safety relief valve - Google Patents

Abstract

The invention discloses a kind of fuel gas pipeline Safety relief valve, including valve body, bonnet, diaphragm, force bearing disk, boring cover, spring, tension adjusting screw；Valve body is bowl-like member, is flange at bead, there is air inlet in side wall, and there is cylindrical structure inner chamber, and cylindrical wall is with being valve port, endoporus connection body cavity and outlet at film contact；Bonnet one end is flange, and the other end is screwed hole；Flexible diaphragm is installed between valve body and bonnet；Spiral-lock has the force bearing disk with guide vane on diaphragm；Spring-force driven dual can be adjusted on force bearing disk by tension adjusting screw；Boring cover can prevent foreign matter from entering.Communicated in use, air inlet connects by protection pipeline, outlet with air；When by the pressure of protection pipeline exceed it is default diffuse pressure when, diffusion valve open, pipeline pressure release；When loine pressure, which drops to, diffuses pressure, diffusion valve is closed.The present invention is simple in construction, and installation, maintenance is convenient, diffuses precision height；By actual test, precision is diffused better than ± 3%.

Description

Fuel gas pipeline Safety relief valve

Technical field

The invention belongs to fuel gas transmission ＆ distribution technology field, and in particular to a kind of fuel gas pipeline Safety relief valve.

Background technology

During the transmission ＆ distribution of pipe gas body, when the downstream no user of pressure regulator uses fuel gas, then pressure regulation Device can close automatically, and it is zero to make by the fuel gas flow of pressure regulator, and now, the downstream pipe of pressure regulator is in sealed shape State；Under this sealing state, if rise or pressure regulator occur for the environment temperature around downstream pipe between upstream and downstream Leaking, then the pressure of downstream pipe can be raised constantly, so that the safety of the gas equipment on downstream pipe is on the hazard, For this reason, it may be necessary to automatic relief is carried out to the fuel gas of downstream pipe after pressure rises to certain value, to maintain downstream pipe Pressure within safe range.

The content of the invention

For the above situation, it is an object of the invention to provide one kind is simple in construction, cost is cheap, sensitive combustible gas Body pipeline Safety relief valve.

To reach above-mentioned purpose, the present invention uses following technical scheme：

A kind of fuel gas pipeline Safety relief valve, it includes valve body, bonnet, diaphragm, force bearing disk, boring cover, spring, pressure Adjusting screw；Described valve body is circular bowl structure, is flange arrangement at its bead, has in the bottom of its inner chamber along axial line One cylindrical structure, one end on cylindrical wall by body cavity are formed with valve mouth structure, are a through hole, its one end and valve body in cylinder Intracavity inter-connection, the other end are connected as outlet with the external world；Air inlet is provided with the side wall of valve body；One end of the bonnet Be the flange arrangement to match with valve body at its bead for disc-shaped structure, its other end is internal thread hole structure, disk with it is interior Thread pore structure on the same axis, is formed with the spiracle of a ventilation in the side wall of internal thread hole；Described diaphragm is soft The disc-shaped component of property, is installed between valve body and the flange of bonnet；The side spiral-lock relative with valve port has one on diaphragm Individual circular force bearing disk, makes diaphragm between force bearing disk and valve port；Being connected firmly between force bearing disk and diaphragm and seal； Apply an appropriate active force can to valve port direction at the center of force bearing disk and cut off runner between diaphragm and valve port, from And the inner chamber chamber of valve body is set to be in air-tight state；On described force bearing disk one is radially being distributed with towards outlet plenum side Group quantity is no less than the guide vane of three；Cooperation between this group of guide vane and valve opening is accurate and loosens, its effect be While ensureing that motion of membrane is flexible, it is ensured that remain at same position between valve port and diaphragm when diffusion valve is closed repeatedly Contact；The internal thread on external screw thread and bonnet on described tension adjusting screw matches, and is installed on bonnet, rotation pressure Power adjusting screw can be such that it is moved up and down on bonnet；Determine on tension adjusting screw towards the side of force bearing disk provided with spring Position hole, spring are positioned between tension adjusting screw and force bearing disk；Rotational pressure adjusting screw can adjust spring Decrement, so as to adjust the size of spring force；One boring cover is installed on the screwed hole port on the outside of bonnet to prevent foreign matter to enter Enter.

The operation principle of diffusion valve is：When body cavity does not have Fluid pressure, positioned at tension adjusting screw and hold Diaphragm is pushed to valve port, diaphragm is close to valve port by the spring-force driven dual caused by spring between power disk on force bearing disk；When When body cavity has certain Fluid pressure, this Fluid pressure acts on caused fluid force on diaphragm, makes diaphragm There is the trend for departing from valve port；A sealing is produced under the collective effect of spring force and fluid matasomatism knife, between diaphragm and valve port Power；The spring force of diffusion valve is once set up, and the size of sealing force is dependent on the size of fluid force, i.e., depending in valve body The Fluid pressure of chamber：The Fluid pressure of body cavity is bigger, and sealing force is smaller, conversely, the Fluid pressure of body cavity is smaller, it is close Feng Liyue is big；When the Fluid pressure of body cavity is smaller, and sealing force is more than the minimum sealing force that can keep sealing valve port state, Diffusion valve is at closed mode；When the Fluid pressure of body cavity is gradually increasing, fluid force can become larger, sealing Power will be gradually reduced, and when sealing force is less than the minimum sealing force that can keep sealing valve port state, diffusion valve is switched on；With The unlatching of diffusion valve, the fluid just outwards discharge of body cavity；As fluid constantly outwards discharges, the Fluid pressure of body cavity It is gradually reduced, the sealing force between diaphragm and valve port gradually increases, and sealing valve port state can be kept when sealing force increases to again Minimum sealing force more than when, diffusion valve is just re-closing off；Guide vane is being repeated by the guide effect diffusion valve of valve opening Contact condition during closing between valve port and diaphragm is stablized constant, avoids influence of the valve port impression to closing on diaphragm, really The reliability closed is protected；The fluid pressure value for making diffusion valve start to open is exactly that diffusion valve diffuses pressure；Adjust spring force The regulation of size can diffuse the size of pressure value.

During actual use, by protection pipeline, outlet connection is specific to diffuse pipeline or directly and air for air inlet connection It is connected, rotational pressure adjusting screw, the pressure of diffusing for making diffusion valve is by the safety margins pressure of protection pipeline；When being protected When pressure in pipeline is risen to more than safety margins pressure, diffusion valve is switched on, and just passes through valve by the fluid in protection pipeline To specifically diffusing pipeline or being discharged directly to the atmosphere, the pressure for making to be protected in pipeline declines runner between mouth and diaphragm, Reach the purpose of safeguard protection；When pressure in by protection pipeline drops to below safety margins pressure, diffusion valve is with regard to automatic Close.

Present invention has the advantages that：Simple in construction, processing, installation, maintenance are convenient, most importantly diffuse precision height；Through Actual use test is crossed, diffuses precision better than ± 3%.

Brief description of the drawings

Fig. 1 is schematic structural view of the invention；

It is 1- valve bodies to be marked in figure, 2- bonnets, 3- diaphragms, 4- force bearing disks, 5- boring covers, 6- springs, 7- pressure regulation spiral shell Nail.

Embodiment

In order that those skilled in the art more fully understands technical scheme, it is below in conjunction with the accompanying drawings and specific real Applying example, the present invention is described in further detail.

The embodiment of the present invention is described as follows with reference to Fig. 1：

A kind of fuel gas pipeline Safety relief valve, it includes valve body 1, bonnet 2, diaphragm 3, force bearing disk 4, boring cover 5, spring 6th, tension adjusting screw 7；Described valve body 1 is circular bowl structure, is flange arrangement at its bead, on the bottom edge of its inner chamber Axial line has a cylindrical structure, leans on one end of the inner chamber of valve body 1 to be formed with valve mouth structure on cylindrical wall, is a through hole in cylinder, its One end and the intracavity inter-connection of valve body 1, the other end are connected as outlet with the external world；One end of the bonnet 2 is disc-shaped structure, It is the flange arrangement to match with valve body 1 at its bead, its other end is internal thread hole structure, and disk exists with internal thread hole structure On same axis, the spiracle of a ventilation is formed with the side wall of internal thread hole；Described diaphragm 3 is flexible disc-shaped structure Part, it is installed between the flange of valve body 1 and bonnet 2；The side spiral-lock relative with valve port has one circular to hold on diaphragm 3 Power disk 4, being connected firmly between force bearing disk 4 and diaphragm 3 and is sealed；Apply one to valve port direction at the center of force bearing disk 4 Runner between appropriate active force can cut-out diaphragm 3 and valve port, so that the inner chamber of valve body 1 is in air-tight state；Institute Guide vane of the one group of quantity no less than three is radially being distributed with towards outlet plenum side on the force bearing disk 4 stated；The group Cooperation between guide vane and valve opening is accurate and loosened that it is while guarantee motion of membrane is flexible that it, which is acted on, it is ensured that Same position is remained at when diffusion valve is closed repeatedly between valve port and diaphragm to contact；On described tension adjusting screw 7 External screw thread matches with the internal thread on bonnet 2, is installed on bonnet 2, and rotational pressure adjusting screw 7 can make it in bonnet 2 On move up and down；Location hole of the spring is provided with towards the side of force bearing disk on tension adjusting screw 7, spring 6 is positioned installation Between tension adjusting screw 7 and force bearing disk 4；Rotational pressure adjusting screw 7 can adjust the decrement of spring 6, so as to adjust Spring force T size；One boring cover 5 is installed on the screwed hole port in the outside of bonnet 2 to prevent foreign matter to enter.

The operation principle of diffusion valve is：When there is no Fluid pressure in the inner chamber of valve body 1, positioned at tension adjusting screw 7 The spring force T caused by spring 6 between force bearing disk 4 is acted on force bearing disk 4, and diaphragm 3 is pushed to valve port, makes diaphragm 3 It is close to valve port；When diffusing valve insertion and having certain Fluid pressure, this Fluid pressure acts on caused fluid on diaphragm Directed force F, diaphragm 3 is set to have the trend for departing from valve port；Under spring force T and fluid force F collective effect, diaphragm 3 and valve A sealing force is produced between mouthful, its size is T-F；Once setting up, the size of sealing force is dependent on the spring force T of diffusion valve Fluid force F size, the i.e. Fluid pressure depending on the inner chamber of valve body 1：The Fluid pressure of the inner chamber of valve body 1 is bigger, sealing force Smaller, conversely, the Fluid pressure of the inner chamber of valve body 1 is smaller, sealing force is bigger；When the Fluid pressure of the inner chamber of valve body 1 is smaller, sealing force During more than the minimum sealing force that can keep sealing valve port state, diffusion valve is at closed mode；When the fluid pressure of the inner chamber of valve body 1 When power is gradually increasing, fluid force F can be become larger, and sealing force will be gradually reduced, and valve port can be kept when sealing force is less than During the minimum sealing force of sealing state, diffusion valve is switched on；With the unlatching of diffusion valve, the fluid of the inner chamber of valve body 1 is just outwards arranged Put；As fluid constantly outwards discharges, the Fluid pressure of the inner chamber of valve body 1 is gradually reduced, the sealing force between diaphragm 3 and valve port by Cumulative big, when sealing force increases to again can keep more than the minimum sealing force of sealing valve port state, diffusion valve just closes again Close；Contact condition of the guide vane by the guide effect diffusion valve of valve opening when repeating to close between valve port and diaphragm is stable It is constant, avoid influence of the valve port impression to closing on diaphragm, it is ensured that the reliability of closing；Diffusion valve is set to start what is opened Fluid pressure value is exactly that diffusion valve diffuses pressure；The size of pressure value is diffused in regulation spring force T size can regulation.

During actual use, by protection pipeline, outlet connection is specific to diffuse pipeline or directly and air for air inlet connection It is connected, rotational pressure adjusting screw 7, the pressure of diffusing for making diffusion valve is by the safety margins pressure of protection pipeline；When being protected When pressure in pillar road is risen to more than safety margins pressure, diffusion valve is switched on, and is just passed through by the fluid in protection pipeline To specifically diffusing pipeline or being discharged directly to the atmosphere, the pressure for making to be protected in pipeline declines valve port, reaches safeguard protection Purpose；When pressure in by protection pipeline drops to below safety margins pressure, diffusion valve is just automatic to close.

It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair The limitation of the present invention, protection scope of the present invention should be defined by claim limited range.For the art For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change Enter and retouch and also should be regarded as protection scope of the present invention.

Claims (4)

1. a kind of fuel gas pipeline Safety relief valve, it includes valve body (1), bonnet (2), diaphragm (3), force bearing disk (4), boring cover (5), spring (6), tension adjusting screw (7)；It is characterized in that valve body (1) is circular bowl structure, it is flange knot at its bead Structure, there is a cylindrical structure along axial line in the bottom of its inner chamber, lean on one end of valve body (1) inner chamber to be formed with valve port knot on cylindrical wall Structure, interior cylinder is a through hole, its one end and valve body (1) intracavity inter-connection, and the other end is connected as outlet with the external world；In valve body (1) side wall is provided with air inlet；One end of bonnet (2) is disc-shaped structure, is the method to match with valve body (1) at its bead Blue structure, its other end are internal thread hole structure, disk with internal thread hole structure on the same axis, in the side wall of internal thread hole It is formed with the spiracle of a ventilation；Diaphragm (3) is flexible disc-shaped component, is installed in the method for valve body (1) and bonnet (2) Between orchid；The side spiral-lock relative with valve port has a circular force bearing disk (4) on diaphragm (3)；In direction on force bearing disk (4) The guide vane that one group of quantity is no less than three is radially distributed with outlet plenum side.

2. the fuel gas pipeline Safety relief valve according to claims 1, it is characterised in that tension adjusting screw (7) is logical The external screw thread to match with the internal thread on bonnet (2) crossed thereon is arranged on bonnet (2), and turning adjusting screw (7) can make It is moved up and down on bonnet (2)；The center of tension adjusting screw (7) is provided with a bullet in the orientation towards force bearing disk (4) Spring positioning hole.

3. the fuel gas pipeline Safety relief valve according to claims 1 or 2, it is characterised in that spring (6) passes through pressure Positioning hole location and installation in power adjusting screw (7) is between tension adjusting screw (7) and force bearing disk (4).

4. the fuel gas pipeline Safety relief valve according to claims 1 or 2, it is characterised in that the spiral shell on the outside of bonnet One boring cover (5) is installed on pit port.