CN219549699U - Back pressure prevention double-sealing spring type safety valve - Google Patents
Back pressure prevention double-sealing spring type safety valve Download PDFInfo
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- CN219549699U CN219549699U CN202320891057.XU CN202320891057U CN219549699U CN 219549699 U CN219549699 U CN 219549699U CN 202320891057 U CN202320891057 U CN 202320891057U CN 219549699 U CN219549699 U CN 219549699U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Control Of Fluid Pressure (AREA)
Abstract
The utility model relates to an anti-back pressure double-seal spring type safety valve, which comprises a valve body, a valve seat, a valve clack, a recoil disc, a guide sleeve, a valve cover and a pressure setting device, wherein a middle cavity and an outlet cavity are isolated under the closing state of the valve clack, the medium in the outlet cavity is prevented from influencing the sealing specific pressure between the sealing surface of the valve clack and the sealing surface of the valve seat, the inconsistency between the setting pressure and the preset setting pressure is avoided, the early opening or the delayed opening of the valve is avoided, and the safety valve has the advantages of accurate and stable setting pressure and the like.
Description
Technical Field
The utility model belongs to the field of valves, and particularly relates to a spring type safety valve.
Background
When the traditional spring type safety valve is used, when the valve is in a closed state, if a medium exists in an outlet cavity, when the pressure of the medium fluctuates, the downward force of the medium acting on the valve clack changes, and as the downward force of the spring acting on the valve clack is kept unchanged, the sealing specific pressure between the sealing surface of the valve clack and the sealing surface of the valve seat cannot be kept stable, so that the consistency of the valve setting pressure is influenced, the setting pressure is inconsistent with the preset setting pressure, the valve is opened (opened in advance) when the pressure of the medium in the inlet cavity does not reach the preset setting pressure value, or the valve is not opened in time (delayed to be opened) when the pressure of the medium in the inlet cavity reaches the preset setting pressure value, and the accuracy and stability of the setting pressure are poor.
Disclosure of Invention
The utility model aims to solve the problems in the prior art and provides a back pressure prevention double-seal spring type safety valve which can prevent the pressure of outlet medium from influencing the set pressure value, and has the advantages of high accuracy and good stability of the set pressure.
The technical scheme for realizing the purpose of the utility model is as follows:
the back pressure prevention double-seal spring type safety valve comprises a valve body, a valve seat, a valve clack, a recoil disc, a guide sleeve, a valve cover and a pressure setting device, wherein the valve clack is fixedly arranged at the center of the lower end face of the recoil disc, the upper part of the recoil disc is in movable fit with a guide hole of the guide sleeve, a radial disc at the upper end of the guide sleeve is sealed and pressed between the valve body and the valve cover, the pressure setting device comprises a valve rod, a setting spring and an adjusting screw sleeve, the lower end of the valve rod is propped against the center of the back face of the recoil disc, the setting spring is arranged between an upper spring seat and a lower spring seat on the valve rod, the adjusting screw sleeve is arranged on the valve cover in a threaded manner, and the lower end of the adjusting screw sleeve is propped against the upper end face of the upper spring seat; the method is characterized in that: the back pressure isolation device is arranged between the middle cavity and the outlet cavity of the valve body and consists of a partition plate, a piston sleeve and a spring, the partition plate is fixedly connected to one side, close to the outlet cavity, of the upper end face of the piston sleeve, the piston sleeve is movably and hermetically arranged in a piston cavity arranged in the valve body, a breathing hole is formed in the bottom surface of the piston cavity, the spring is arranged between the bottom surface of the piston cavity and the piston sleeve, and a step matched with the partition plate in a sealing mode is arranged in the outlet cavity.
Preferably, the partition plate adopts a cylindrical surface structure, the diameter of the cylindrical surface is at least equal to the inner diameter of the outlet cavity, and the step in the outlet cavity is provided with an arc surface with the diameter equal to that of the cylindrical surface of the partition plate.
Preferably, the partition plate adopts a rectangular flat plate structure, the width of the rectangular flat plate structure is larger than the diameter of the outlet cavity, and the piston sleeve is provided with a rectangular outer plane which is equal to the width of the partition plate.
Compared with the prior art, the utility model has the beneficial effects that: and a back pressure isolation device is arranged between the valve body middle cavity and the outlet cavity, and under the closing state of the valve clack, the middle cavity and the outlet cavity are isolated, so that the medium in the outlet cavity is prevented from influencing the sealing specific pressure between the valve clack sealing surface and the valve seat sealing surface, the inconsistency between the setting pressure and the preset setting pressure is avoided, the valve is prevented from being opened in advance or delayed, and the valve has the advantages of accurate and stable setting pressure and the like.
Drawings
Fig. 1 is a schematic view of the structure of the present utility model in a closed state.
Fig. 2 is a schematic view of the structure of the discharge state of the present utility model.
In the figure: the valve comprises a valve body 1, a valve seat 2, an adjusting ring 3, a recoil disk 4, a valve clack 5, a middle cavity 6, a guide sleeve 7, a valve cover 8, a valve rod 9, a setting spring 10, an upper spring seat 11, an adjusting screw sleeve 12, a valve cap 13, an outlet cavity 14, a partition plate 15, a piston sleeve 16, a sealing ring 17, a spring 18, a piston cavity 19, a breathing hole 20 and an inlet cavity 21.
Detailed Description
The back pressure prevention double-sealing spring type safety valve shown in fig. 1 comprises a valve body 1, a valve seat 2, a valve clack 5, a recoil disc 4, a guide sleeve 7, a valve cover 8 and a pressure setting device, wherein the valve seat 2 is arranged in an inlet cavity 21 of the valve body 1 by adopting threads, the valve clack 5 is fixedly arranged at the center of the lower end face of the recoil disc 4, the upper part of the recoil disc 4 is in movable fit with a guide hole of the guide sleeve 7, a radial disc at the upper end of the guide sleeve 7 is sealed and pressed between the valve body 1 and the valve cover 8, the pressure setting device comprises a valve rod 9, a setting spring 10 and an adjusting screw sleeve 12, the lower end of the valve rod 9 is propped against the center of the back face of the recoil disc 4, the setting spring 10 is arranged between an upper spring seat and a lower spring seat on the valve rod 9, the adjusting screw sleeve 12 is arranged on the valve cover 8 by adopting threads, the lower end of the adjusting screw sleeve 12 is propped against the upper end of the upper spring seat 11, the axial position of the adjusting screw sleeve 12 is adjusted to realize the setting of the compression force of the pressure setting valve cover 10, the valve cover 8 is arranged at the upper end of the valve cover 13 to prevent the valve cover 8 from entering the cavity, the outlet end of the valve seat 2 is provided with an adjusting ring 3, the opening height of the valve seat 5 is adjusted; the method is characterized in that: the back pressure isolation device is arranged between the middle cavity 6 and the outlet cavity 14 of the valve body 1 and consists of a partition plate 15, a piston sleeve 16 and a spring 18, wherein the partition plate 15 is fixedly connected to one side, close to the outlet cavity 14, of the upper end face of the piston sleeve 16, the piston sleeve 16 is movably and hermetically arranged in a piston cavity 19 arranged in the valve body 1, a breathing hole 20 is formed in the bottom face of the piston cavity 19, the spring 18 is arranged between the bottom face of the piston cavity 19 and the piston sleeve 16, a sealing ring 17 is arranged on the periphery of the piston sleeve 16 and is in movable sealing fit with the inner cavity wall of the piston cavity 19, and a step which is mutually in sealing fit with the partition plate 15 is arranged in the outlet cavity 14. When the valve clack 5 is in a closed state, the spring 18 pushes the piston sleeve 16 to enable the partition plate 15 to ascend to be in sealing fit with the step in the outlet cavity 14, so that the outlet cavity 14 is isolated from the middle cavity, and the medium in the outlet cavity 14 is prevented from affecting the setting pressure; when the valve clack 5 is opened, medium pressure enters the upper end face of the piston sleeve 16 from the middle cavity 6, the piston sleeve 16 is pushed to compress the spring 18, the piston sleeve 16 and the partition plate 15 are pushed into the piston cavity 19, and the medium is discharged through the outlet cavity 14, as shown in fig. 2.
The baffle 15 adopts a cylindrical surface structure, the diameter of the cylindrical surface is at least equal to the inner diameter of a flow channel of the outlet cavity 14, the outlet cavity 14 can be completely sealed when the baffle 15 ascends, the middle cavity 6 is completely isolated from the outlet cavity 14, the steps in the outlet cavity 14 are provided with arc surfaces with the diameter equal to the diameter of the cylindrical surface of the baffle 15, and the sealing fit between the baffle 15 and the steps in the outlet cavity 14 is ensured.
The partition plate 15 adopts a rectangular flat plate structure, the width of the partition plate is larger than the diameter of the outlet cavity 14, the outlet cavity 14 can be completely sealed when the partition plate 15 ascends, the middle cavity 6 and the outlet cavity 14 are completely isolated, and the piston sleeve 16 is provided with a rectangular outer plane which is equal to the width of the partition plate 15, so that the partition plate 15 and the piston sleeve 16 can integrally enter the piston cavity 19.
Claims (3)
1. The utility model provides a prevent two sealed spring relief valve of backpressure, including valve body (1), disk seat (2), valve clack (5), recoil disc (4), uide bushing (7), valve gap (8), pressure setting device, valve clack (5) fixed mounting is in recoil disc (4) lower terminal surface center department, recoil disc (4) upper portion and uide bushing (7) guiding hole movable fit, the radial disc seal pressure of uide bushing (7) upper end is installed between valve body (1) and valve gap (8), pressure setting device includes valve rod (9), setting spring (10), adjusting screw sleeve (12), setting spring (10) are installed on valve rod (9) between upper and lower spring holder, adjusting screw sleeve (12) screw thread is installed on valve gap (8), its lower extreme roof pressure with in the up end of upper spring holder (11); the method is characterized in that: set up backpressure isolating device between well chamber (6) and export chamber (14) of valve body (1), backpressure isolating device comprises baffle (15), piston cover (16), spring (18), baffle (15) fixed connection is close to export chamber (14) one side at piston cover (16) up end, piston cover (16) move seal installs in piston chamber (19) that set up in valve body (1), piston chamber (19) bottom surface is equipped with breathing hole (20), spring (18) are installed between piston chamber (19) bottom surface and piston cover (16), set up in export chamber (14) with baffle (15) mutual sealing fit's step.
2. The back pressure resistant double seal spring type safety valve according to claim 1, wherein: the partition plate (15) adopts a cylindrical surface structure, the diameter of the cylindrical surface is at least equal to the inner diameter of a flow channel of the outlet cavity (14), and steps in the outlet cavity (14) are provided with arc surfaces with the same diameter as the cylindrical surface of the partition plate (15).
3. The back pressure resistant double seal spring type safety valve according to claim 1, wherein: the partition plate (15) adopts a rectangular flat plate structure, the width of the partition plate is larger than the diameter of the outlet cavity (14), and the piston sleeve (16) is provided with a rectangular outer plane which is equal to the width of the partition plate (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320891057.XU CN219549699U (en) | 2023-04-20 | 2023-04-20 | Back pressure prevention double-sealing spring type safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320891057.XU CN219549699U (en) | 2023-04-20 | 2023-04-20 | Back pressure prevention double-sealing spring type safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219549699U true CN219549699U (en) | 2023-08-18 |
Family
ID=87700117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320891057.XU Active CN219549699U (en) | 2023-04-20 | 2023-04-20 | Back pressure prevention double-sealing spring type safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219549699U (en) |
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2023
- 2023-04-20 CN CN202320891057.XU patent/CN219549699U/en active Active
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