CN220470731U - Diaphragm balance type pressure relief valve - Google Patents
Diaphragm balance type pressure relief valve Download PDFInfo
- Publication number
- CN220470731U CN220470731U CN202321834528.XU CN202321834528U CN220470731U CN 220470731 U CN220470731 U CN 220470731U CN 202321834528 U CN202321834528 U CN 202321834528U CN 220470731 U CN220470731 U CN 220470731U
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- Prior art keywords
- valve
- diaphragm
- pressure relief
- spring
- clack
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- 238000003466 welding Methods 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
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- Safety Valves (AREA)
Abstract
The utility model relates to a diaphragm balance type pressure relief valve which can be used for pressure relief valves in the fields of petrifaction and the like. The diaphragm balance type pressure relief valve consists of a valve body, a valve seat, a fixed rod, a valve clack assembly, a guide sleeve, a diaphragm adapter, a spring cover, a spring, a valve rod, an adjusting screw, a small cover, an upper spring seat, a lower spring seat, a nut, a double-end stud and a pressure relief pipe; the valve body is connected with the valve seat by screw threads and welding, and is connected with the spring cover by a double-end stud and a nut, so as to sequentially compress the diaphragm adapter, the diaphragm and the guide sleeve. The diaphragm replaces the bellows to be arranged on the valve clack assembly, balances the back pressure of the valve cavity, has flexibility than the bellows, reduces the possibility of damage when the valve is opened and closed in a quick circulation mode, prolongs the service life, improves the tripping accuracy, reliability and stability of the pressure relief valve, and reduces the manufacturing and maintenance cost. Meanwhile, the backflushing disc is in spherical contact with the valve clack, and the valve rod is in spherical contact with the backflushing disc, so that manufacturing errors can be eliminated, and the pressure release valve is guaranteed to achieve good tightness.
Description
Technical Field
The utility model relates to a diaphragm balance type pressure relief valve which can be used for pressure relief valves in the fields of petrifaction and the like.
Background
At present, most pressure relief valves arranged on equipment in the petrochemical field have back pressure, and the pressure of the back pressure also fluctuates, so that the tripping accuracy and accuracy of the safety valve are seriously affected. Therefore, pressure relief valves with back pressure conditions typically employ balanced pressure relief valves with bellows.
The fault rate of the corrugated pipe is found to be between 2% and 6% by analyzing the data recorded by 3 ten thousand operation services of different fields and different valve brands. That is, of 1000 pressure relief valve devices, 20 to 60 bellows may be damaged but still running. Bellows failure is mainly due to excessive back pressure and rapid cycling. The rupture of the bellows can lead to fugitive emissions that prevent the valve from operating at a set pressure and also present a risk of overpressure accidents. Meanwhile, the rigidity stability of the corrugated pipe is poor, and the tripping accuracy of the pressure release valve is directly affected. In addition, the bellows is costly to manufacture.
The utility model provides a diaphragm balance type pressure relief valve, which replaces a corrugated pipe, wherein a diaphragm with the same medium effective area as a valve clack is arranged on a valve clack assembly, and the diaphragm is more flexible than the corrugated pipe, so that the service life is greatly prolonged, the tripping precision, reliability and stability of the pressure relief valve are improved, and the manufacturing and maintenance cost of the valve is reduced.
Disclosure of Invention
The utility model provides a diaphragm balance type pressure relief valve, which is long in service life, high in tripping precision, good in reliability and stability and provided with a valve clack assembly with a diaphragm; the recoil disc is in spherical contact with the valve clack, and the valve rod is in spherical contact with the recoil disc, so that manufacturing errors are eliminated, and the pressure release valve is guaranteed to achieve good tightness.
The utility model provides a diaphragm balance type pressure relief valve which consists of a valve body, a valve seat, a fixed rod, a valve clack assembly, a guide sleeve, a diaphragm adapter, a spring cover, a spring, a valve rod, an adjusting screw, a small cover, an upper spring seat, a lower spring seat, a nut, a double-end stud and a pressure relief pipe; the valve body is connected with the valve seat by screw threads and welding, and is connected with the spring cover by a double-end stud and a nut, so as to sequentially compress the diaphragm adapter, the diaphragm and the guide sleeve.
The valve clack assembly comprises a recoil disc, a valve clack, a bottom plate, a diaphragm, a supporting frame, a hexagonal lock nut and a locking gasket, wherein the diaphragm completely isolates the inner cavity of the valve body from the inner cavity of the spring cover, so that a medium with back pressure in the inner cavity of the valve body cannot enter the spring cover, and once the medium enters the spring cover, the medium can be quickly removed through a pressure release pipe arranged on the spring cover. The diaphragm is driven by the valve clack component to perform full-stroke opening and closing movement under the protection and support of the inner hole of the diaphragm adapter and the outer circle of the support frame.
The anti-loose gasket is provided with 1 anti-rotation edge and 6 bent edges, the included angles between the adjacent bent edges are 40 degrees, 70 degrees, 40 degrees, 50 degrees and 50 degrees in sequence, the distance from the anti-rotation edge to the central line of the anti-rotation edge is L, and the excircle of the bent edge is provided with a plurality of anti-rotation grooves which are formed in the same shape as the anti-loose gasketIs smaller than the inner diameter of the supporting frame 45->The inner hole cylindrical surface of the support frame is provided with a groove, the vertical distance from the bottom plane of the groove to the central line of the groove is L1, and the side surface and the inner diameter of the groove of the support frame 45 are as followsThe vertical distance from the intersecting line to the central line of the intersecting line is L2, wherein L is smaller than L1 and larger than L2; bending edge outer circle->Is smaller than the inner diameter of the support frame
The anti-rotation edge width of the anti-loosening gasket is h, the width of the support frame groove is h1, h1 is greater than or equal to h+0.2mm, and h1 is smaller than h+0.5mm.
The anti-rotation edge of the anti-loosening gasket is arranged in the groove of the support frame to prevent the anti-loosening gasket from rotating; after the hexagonal lock nut is screwed, one bending edge of the anti-loose gasket is tightly attached to the hexagonal lock nut to be bent upwards by 90 degrees, so that the hexagonal lock nut is prevented from rotating loose.
The effective area corresponding to the effective diameter D of the diaphragm is A D Effective diameter d of valve clackThe corresponding effective medium force area is A d . When the back pressure of the pressure relief valve is P, the upward acting force f1=p×a of the back pressure medium to the diaphragm D Force f2=p×a of back pressure medium to valve clack downward d The effective area A of the membrane in the patent project D Equal to the dielectric force acting area A of the valve clack d Thus, F1 is equal to F2.
When the back pressure P of the pressure relief valve changes, the jump pressure of the valve clack is not influenced.
The lower end of the recoil disk is provided with a rough thread and a conical surface, the outer circle of the valve clack is provided with the same rough thread as the recoil disk, the top of the valve clack is provided with a ball R, the valve clack is rotated to enable the rough thread to be screwed through the rough thread of the recoil disk, the valve clack is connected with the recoil disk to prevent the valve clack from falling off, when the valve is closed, the ball R of the valve clack is contacted with the conical surface of the recoil disk to realize universal connection, the valve clack and the recoil disk can freely move within a certain range, and the valve clack and the sealing surface of the valve seat are tightly attached.
The upper end of the recoil disc is provided with a spherical SR, the lower end of the valve rod is provided with a spherical SR1, and SR is greater than or equal to SR1+0.5mm and less than SR1+1mm. The valve rod is contacted with the sphere of the recoil disc, the sphere of the recoil disc is contacted with the sphere of the valve clack, the manufacturing errors of parts such as springs and the like are eliminated, the spring force is enabled to act on the valve clack as vertically as possible, and the pressure release valve is guaranteed to achieve good sealing performance.
The utility model has the beneficial effects that the diaphragm is adopted to replace the corrugated pipe, the diaphragm which has the same medium effective area as the valve clack is arranged on the valve clack assembly, the back pressure in the cavity of the valve body is balanced, the diaphragm has flexibility more than the corrugated pipe, and the possibility of damage of the valve during quick cycle opening and closing is reduced. The service life is greatly prolonged, the tripping precision, reliability and stability of the pressure release valve are improved, and the manufacturing and maintenance cost of the valve is reduced. Meanwhile, the backflushing disc is in spherical contact with the valve clack, and the valve rod is in spherical contact with the backflushing disc, so that manufacturing errors are eliminated, and the pressure release valve is guaranteed to achieve good tightness.
Drawings
FIG. 1 is a schematic diagram of a bellows relief valve;
FIG. 2 is a schematic diagram of a diaphragm balanced pressure relief valve;
FIG. 3 is a schematic structural view of a valve flap assembly;
FIG. 4 is a schematic view of the structure of the anti-loose gasket;
FIG. 5 is a schematic structural view of a support frame;
FIG. 6 is a schematic structural view of a kick plate;
FIG. 7 is a schematic structural view of a valve flap;
fig. 8 is a schematic structural view of the valve stem.
In the drawings, 1, valve body, 2, valve seat, 3, fixed rod, 4, valve clack assembly, 5, guide sleeve, 6, diaphragm adapter, 7, spring cover, 8, spring, 9, valve stem, 10, adjustment screw, 11, small cover, 12, upper spring seat, 13, lower spring seat, 14, nut, 15, stud, 16, pressure relief tube, 41, recoil disk, 42, valve clack, 43, bottom plate, 44, diaphragm, 45, support frame 46, hexagonal lock nut 47, anti-loose spacer
Detailed Description
In the embodiment shown in fig. 2, the diaphragm balance type pressure relief valve consists of a valve body 1, a valve seat 2, a fixed rod 3, a valve clack assembly 4, a guide sleeve 5, a diaphragm adapter 6, a spring cover 7, a spring 8, a valve rod 9, an adjusting screw 10, a small cover 11, an upper spring seat 12, a lower spring seat 13, a nut 14, a double-end stud 15 and a pressure relief pipe 16; the valve body 1 is connected with the valve seat 2 by adopting screw threads and welding, the valve body 1 is connected with the spring cover 7 by adopting a double-end stud 15 and a nut 14, and the diaphragm adapter 6, the diaphragm 44 and the guide sleeve 5 are sequentially pressed.
In the embodiment shown in fig. 2 to 8, the valve flap assembly 4 is composed of a recoil disc 41, a valve flap 42, a base plate 43, a diaphragm 44, a support bracket 45, a hexagonal lock nut 46, and a locking washer 47. The diaphragm 44 completely isolates the inner cavity of the valve body 1 from the inner cavity of the spring cover 7, so that the medium with back pressure in the inner cavity of the valve body 1 cannot enter the spring cover 7, and once the medium enters the spring cover, the medium can be quickly removed through the pressure release pipe 16 arranged on the spring cover 7. The diaphragm 44 is driven by the valve clack assembly 4 to perform full-stroke opening and closing movement under the protection and support of the inner hole of the diaphragm adapter 6 and the outer circle of the support frame 45. The diaphragm has flexibility than the bellows, reduces the possibility of damage when the valve is opened and closed in a quick circulation mode. The service life is greatly prolonged, the reliability and stability of the pressure relief valve are improved, and the manufacturing and maintenance cost of the valve is reduced.
The effective diameter D of the diaphragm 44 corresponds to an effective area A D The effective medium force area corresponding to the effective diameter d of the valve clack 42 is A d . When the back pressure of the relief valve is P, the upward force f1=pχa of the back pressure medium to the diaphragm 44 D Downward force f2=p×a of back pressure medium against valve flap 42 d Effective area A of the diaphragm 44 of this item D Equal to the area A of the flap 42 against which the dielectric force acts d Thus, F1 is equal to F2. When the back pressure P of the relief valve changes, the take-off pressure of the flap 42 is not affected.
The anti-loose spacer 47 is provided with 1 anti-rotation edge and 6 bent edges, the included angles between the adjacent bent edges are 40 degrees, 70 degrees, 40 degrees, 50 degrees and 50 degrees in sequence, the distance from the anti-rotation edge to the central line of the anti-rotation edge is L, and the excircle of the bent edge is provided with a plurality of anti-rotation edgesIs smaller than the inner diameter of the supporting frame 45->A groove is arranged on the cylindrical surface of the inner hole of the support frame 45, the vertical distance from the bottom plane of the groove of the support frame 45 to the central line of the groove is L1, and the side surface and the inner diameter of the groove of the support frame 45 are +.>The perpendicular distance from the intersection line to its centerline is L2, L being less than L1 and greater than L2.
The anti-rotation edge width of the anti-loosening gasket 47 is h, the width of the groove of the supporting frame 45 is h1, h1 is more than or equal to h+0.2mm, and h1 is less than h+0.5mm.
The anti-rotation edge of the anti-loosening gasket 47 is arranged in the groove of the supporting frame 45 to prevent the anti-loosening gasket 47 from rotating; when the hexagonal lock nut 46 is screwed, a proper bending edge of the anti-loose washer 47 is tightly attached to the hexagonal lock nut 46 to be bent upwards by 90 degrees, so that the hexagonal lock nut 46 is prevented from rotating loose.
The lower end of the recoil disc 41 is provided with a rough thread and a conical surface, the outer circle of the valve clack 42 is provided with the same rough thread as the recoil disc 41, the top of the valve clack 42 is provided with a ball R, the valve clack 42 is rotated to enable the rough thread to be screwed over the rough thread of the recoil disc 41, the valve clack 42 is connected with the recoil disc 41 to prevent the valve clack 42 from falling off, when the valve is closed, the ball R of the valve clack 42 is contacted with the conical surface of the recoil disc 41 to realize universal connection, the valve clack 42 and the recoil disc 41 can freely move within a certain range, and the tight fit between the valve clack 42 and the sealing surface of the valve seat 2 is ensured.
The upper end of the recoil disc 41 is provided with a spherical SR, the lower end of the valve rod 9 is provided with a spherical SR1, and SR is greater than or equal to SR1+0.5mm and less than SR1+1mm. The valve rod 9 is in spherical contact with the recoil disc 41, the recoil disc 41 is in spherical contact with the valve clack 42, manufacturing errors of parts such as a spring 8 are eliminated, the spring force is enabled to act on the valve clack 42 as vertically as possible, and good tightness of the pressure relief valve is guaranteed.
Claims (5)
1. A diaphragm balance type pressure release valve is characterized in that: the valve consists of a valve body (1), a valve seat (2), a fixed rod (3), a valve clack assembly (4), a guide sleeve (5), a diaphragm adapter (6), a spring cover (7), a spring (8), a valve rod (9), an adjusting screw (10), a small cover (11), an upper spring seat (12), a lower spring seat (13), a nut (14), a double-end stud (15) and a pressure relief pipe (16); the valve body (1) is connected with the valve seat (2) by adopting screw threads and welding, the valve body (1) is connected with the spring cover (7) by adopting a double-end stud (15) and a nut (14), and the diaphragm adapter (6), the diaphragm (44) and the guide sleeve (5) are sequentially pressed; the valve clack assembly (4) consists of a recoil disc (41), a valve clack (42), a bottom plate (43), a diaphragm (44), a supporting frame (45), a hexagonal lock nut (46) and a locking gasket (47).
2. The diaphragm balanced relief valve of claim 1, wherein: the effective area corresponding to the effective diameter D of the diaphragm is equal to the effective medium force area corresponding to the diameter D of the valve clack.
3. The diaphragm balanced relief valve of claim 1, wherein: the anti-loose gasket (47) is provided with 1 anti-rotation edge and 6 bending edges, the included angles between the adjacent bending edges are 40 degrees, 70 degrees, 40 degrees, 50 degrees and 50 degrees in sequence, and the excircle of the bending edge is provided with a plurality of anti-rotation edgesLess thanInner diameter of the supporting frame (45)>The distance from the anti-rotation edge to the center line of the anti-rotation edge is L, and the width of the anti-rotation edge is h; a groove is arranged on the cylindrical surface of an inner hole of the supporting frame (45), the vertical distance from the bottom plane of the groove of the supporting frame (45) to the central line of the groove is L1, and the side surface and the inner diameter of the groove of the supporting frame (45) are +.>The vertical distance from the intersecting line to the central line of the intersecting line is L2, wherein L is smaller than L1 and larger than L2; the width of the groove is h1, h1 is more than or equal to h+0.2mm, and h1 is less than h+0.5mm.
4. The diaphragm balanced relief valve of claim 1, wherein: the lower end of the recoil disc (41) is provided with a rough thread and a conical surface, the excircle of the valve clack (42) is provided with the same rough thread as the recoil disc (41), and the top of the valve clack (42) is provided with a ball R.
5. The diaphragm balanced relief valve of claim 1, wherein: the upper end of the recoil disc is provided with a spherical SR, the lower end of the valve rod is provided with a spherical SR1, and SR is greater than or equal to SR1+0.5mm and less than SR1+1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321834528.XU CN220470731U (en) | 2023-07-12 | 2023-07-12 | Diaphragm balance type pressure relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321834528.XU CN220470731U (en) | 2023-07-12 | 2023-07-12 | Diaphragm balance type pressure relief valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220470731U true CN220470731U (en) | 2024-02-09 |
Family
ID=89780606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321834528.XU Active CN220470731U (en) | 2023-07-12 | 2023-07-12 | Diaphragm balance type pressure relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220470731U (en) |
-
2023
- 2023-07-12 CN CN202321834528.XU patent/CN220470731U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |