CN212509585U - Main sealing pair plane double sealing structure for stop valve - Google Patents
Main sealing pair plane double sealing structure for stop valve Download PDFInfo
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- CN212509585U CN212509585U CN202021416320.2U CN202021416320U CN212509585U CN 212509585 U CN212509585 U CN 212509585U CN 202021416320 U CN202021416320 U CN 202021416320U CN 212509585 U CN212509585 U CN 212509585U
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Abstract
The utility model belongs to double seal structure, concretely relates to low leakage rate main seal double seal structure who is applicable to high temperature gas cooled reactor nuclear power station nuclear grade helium isolating valve. The utility model provides a double seal structure of vice plane of main seal for stop valve, wherein includes the valve body, sets up the valve gap on the valve body top, sets up the valve clack in the cavity that valve body and valve gap formed, sets up seal structure in the position of the bottom of valve clack and valve body contact. This neotype effect that is showing is: the double-sealing structure enables the valve to have good initial sealing performance, the valve can still keep good sealing performance after acting for a certain number of times, the whole structure is compact, the sealing performance of the main sealing pair of the valve is improved, and meanwhile, the possibility of failure of the main sealing pair is reduced.
Description
Technical Field
The utility model belongs to double seal structure, concretely relates to low leakage rate main seal double seal structure who is applicable to high temperature gas cooled reactor nuclear power station nuclear grade helium isolating valve.
Background
The nuclear grade helium isolating valve is pressure-bearing equipment with a wide range and a large area in a high-temperature gas cooled reactor, needs to operate under the working condition of high temperature and high pressure, and plays an important role in ensuring the normal stable operation and safety of the high-temperature gas cooled reactor. The high-temperature reactor gas cooled reactor has higher requirement on the sealing performance of the helium isolation valve, but the helium has strong permeability, so that the high requirement on the sealing performance of the main sealing pair of the helium isolation valve is provided. At present, a common helium isolating valve adopts a spherical sealing pair, and the hardness difference is formed by overlaying alloys with different hardness on a valve clack and a valve seat, so that the valve has good initial sealing performance. However, after the structure acts for a certain number of times, indentations with different degrees are generated on the sealing surfaces of the valve clack and the valve seat, so that the sealing performance of the main seal of the valve is greatly reduced, and the leakage rate far exceeds the system requirement, thereby influencing the normal use of the valve.
SUMMERY OF THE UTILITY MODEL
This novel aim at provides a stop valve primary seal pair plane double seal structure of low leakage rate under the high temperature high pressure operating mode, adopts C type circle planar seal + metal plane seal's double seal structure.
This is novel to realize like this: the utility model provides a double seal structure of vice plane of main seal for stop valve, wherein includes the valve body, sets up the valve gap on the valve body top, sets up the valve clack in the cavity that valve body and valve gap formed, sets up seal structure in the position of the bottom of valve clack and valve body contact.
The double sealing structure comprises a pressing ring I, the pressing ring I is annular and surrounds the valve clack, a fixing sheet is arranged at the bottom end of the pressing ring I, the pressing ring I is separated from the valve body by the fixing sheet, a protrusion facing the axis direction of the valve clack is arranged on the fixing sheet, a C-shaped ring is arranged around the protrusion, the protrusion of the fixing sheet extends into the interior of the C-shaped ring, the highest position of the C-shaped ring is in contact with the valve clack, and the C-shaped ring is arranged in a reserved groove of the valve body.
The main sealing pair plane double sealing structure for the stop valve further comprises a pressing ring II, wherein the pressing ring II is annular and is arranged above the pressing ring I.
The main sealing pair plane double sealing structure for the stop valve further comprises a pressing ring, the pressing ring is arranged above the pressing ring II, the valve cover is arranged above the pressing ring, the pressing ring presses the pressing ring II, the pressing ring II presses the pressing ring I, the pressing ring I presses the fixing sheet, and the fixing sheet is inserted into an opening of the C-shaped ring to fix the C-shaped ring on the valve body.
The main sealing auxiliary plane double sealing structure for the stop valve further comprises a middle cavity gasket, and the middle cavity gasket is arranged between the pressing ring and the valve body.
The main sealing auxiliary plane double sealing structure for the stop valve further comprises a middle flange bolt, and the middle flange bolt is used for fixedly connecting the valve body and the valve cover.
The main sealing auxiliary plane double sealing structure for the stop valve is characterized in that the depth of the valve body groove is set according to requirements, and the depths of different grooves correspond to different sealing degrees.
The double-sealing structure of the main sealing pair plane for the stop valve is characterized in that the valve body and the valve clack are both provided with metal sealing surfaces, and stellite hard alloy is welded on the metal sealing surfaces.
This neotype effect that is showing is: the double-sealing structure enables the valve to have good initial sealing performance, the valve can still keep good sealing performance after acting for a certain number of times, the whole structure is compact, the sealing performance of the main sealing pair of the valve is improved, and meanwhile, the possibility of failure of the main sealing pair is reduced.
Drawings
FIG. 1 is a plan view of a double seal assembly of a primary seal and a secondary seal for a stop valve;
FIG. 2 is a structural diagram of a main seal and auxiliary seal plane double seal for a stop valve
In the figure: 1, a valve body; 2, fixing a sheet; a 3C-shaped ring; 4, valve clack; 5, pressing a ring I; 6, a compression ring II; 7, a flange bolt; 8 a middle cavity gasket; 9, pressing a ring; 10, a valve cover;
Detailed Description
A main sealing pair plane double sealing structure for a stop valve adopts a structure of C-shaped ring plane sealing and metal plane sealing. After the middle flange bolt is fastened by using a certain torque, the longitudinal size of each part forms a size chain, the longitudinal size of each part is reasonably controlled to enable the pressing ring to press the pressing ring II, the pressing ring II presses the pressing ring I, the pressing ring I presses the fixing sheet, the fixing sheet is inserted into the opening of the C-shaped ring to fix the C-shaped ring on the valve body groove, and the C-shaped ring is prevented from being separated from the valve seat. Meanwhile, the valve clack and the compression ring I form a valve clack guide structure, the deflection of the valve clack is controlled, and the sealing performance of the valve is guaranteed.
When the valve is closed, the top of the C-shaped ring and the sealing surface of the valve clack and the bottom of the C-shaped ring and the bottom surface of the groove of the valve body form two plane seals, the compression amount of the C-shaped ring is limited by the depth of the groove of the valve body for placing the C-shaped ring, and the reasonable designed depth of the groove of the valve body can ensure that the C-shaped ring has better compression amount and rebound amount, so that the C-shaped ring has good sealing performance when the valve is closed, and meanwhile, the C-shaped ring can still have better sealing effect after the valve is opened and closed; the valve body and the valve clack are both provided with metal sealing surfaces, stellite hard alloy is welded in an overlaying mode, erosion resistance and wear resistance are good, and when the valve is closed, the metal plane sealing surfaces also play a sealing role, so that double sealing is formed by the metal plane sealing surfaces and the C-shaped ring plane sealing.
For the stop valve which is applied to a high-temperature high-pressure helium medium working condition and has higher requirements on the leakage rate of the main seal, the double-seal structure of the main seal secondary plane is generated. Through this neotype, can make the valve have good initial sealing performance, and the valve still keeps better sealing performance after moving certain number of times to improve the life of valve, guarantee the normal operating of each system of high temperature gas cooled reactor.
Simultaneously, through this novel, main seal pair plane double seal structure also can popularize and apply to other similar stop valves that have the low leak rate requirement.
Claims (8)
1. The utility model provides a double seal structure of main seal secondary plane for stop valve which characterized in that: the valve comprises a valve body (1), a valve cover (10) is arranged at the top end of the valve body (1), a valve clack (4) is arranged in a cavity formed by the valve body (1) and the valve cover (10), and a sealing structure is arranged at the position, contacting with the valve body (1), of the bottom end of the valve clack (4).
2. A primary seal secondary plane double seal structure for a stop valve according to claim 1, wherein: seal structure include clamp ring I (5), this clamp ring I (5) are the annular, encircle valve clack (4) and set up, the bottom of clamp ring I (5) sets up stationary blade (2), this stationary blade (2) separate clamp ring I (5) and valve body (1), stationary blade (2) are equipped with the arch towards valve clack (4) axle center direction, encircle this arch and set up C type circle (3), the arch of stationary blade (2) stretches into inside C type circle (3), the highest point and the valve clack (4) contact of C type circle (3), C type circle (3) set up in the recess that valve body (1) was reserved.
3. A primary seal secondary plane double seal structure for a stop valve according to claim 2, wherein: still include clamp ring II (6), this clamp ring II (6) are the annular, set up the top at clamp ring I (5).
4. A primary seal secondary plane double seal structure for a stop valve according to claim 3, wherein: still include clamping ring (9), clamping ring (9) set up in the top of clamp ring II (6), and the top of clamping ring (9) is valve gap (10), makes clamping ring II (6) pushed down by clamping ring (9), and clamp ring I (5) are pushed down by clamp ring II (6), and clamp ring I (5) are recompressed stationary blade (2), and stationary blade (2) are inserted in the opening of C type circle (3) and are fixed C type circle (3) on the valve body.
5. A primary seal secondary plane double seal structure for a stop valve according to claim 4, wherein: the valve also comprises a middle cavity gasket (8), and the middle cavity gasket (8) is arranged between the pressing ring (9) and the valve body (1).
6. A primary seal secondary plane double seal structure for a stop valve according to claim 5, wherein: the valve body (1) is fixedly connected with the valve cover (10) through the middle flange bolt (7).
7. A primary seal secondary plane double seal structure for a stop valve according to claim 6, wherein: the depth of the valve body groove is set as required, and the depths of different grooves correspond to different sealing degrees.
8. A primary seal secondary plane double seal structure for a stop valve according to claim 7, wherein: the valve body (1) and the valve clack (4) are both provided with metal sealing surfaces and made of stellite hard alloy through surfacing welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021416320.2U CN212509585U (en) | 2020-07-17 | 2020-07-17 | Main sealing pair plane double sealing structure for stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021416320.2U CN212509585U (en) | 2020-07-17 | 2020-07-17 | Main sealing pair plane double sealing structure for stop valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212509585U true CN212509585U (en) | 2021-02-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021416320.2U Active CN212509585U (en) | 2020-07-17 | 2020-07-17 | Main sealing pair plane double sealing structure for stop valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212509585U (en) |
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2020
- 2020-07-17 CN CN202021416320.2U patent/CN212509585U/en active Active
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