CN212509585U

CN212509585U - A double sealing structure of the main sealing pair plane for a globe valve

Info

Publication number: CN212509585U
Application number: CN202021416320.2U
Authority: CN
Inventors: 汤晓刚; 王悦琴; 高志岗; 张易阳; 汝强; 吴莘馨; 严新虹; 王兰群; 高健飞; 俞飞; 李俊
Original assignee: CNNC Sufa Technology Industry Co Ltd
Current assignee: CNNC Sufa Technology Industry Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2021-02-09
Anticipated expiration: 2030-07-17

Abstract

The utility model belongs to a double-sealing structure, in particular to a low-leakage-rate main-sealing double-sealing structure suitable for a nuclear-grade helium isolation valve in a high-temperature gas-cooled reactor nuclear power plant. The utility model relates to a double-sealing structure of a main sealing sub-plane for a globe valve, which comprises a valve body, a valve cover is arranged at the top of the valve body, a valve flap is arranged in the cavity formed by the valve body and the valve cover, and the bottom end of the valve flap is connected with the valve cover. A sealing structure is provided at the position where the body contacts. The remarkable effect of the new type is: such a double sealing structure makes the valve have good initial sealing performance, and the valve can still maintain good sealing performance after a certain number of actions, the overall structure is compact, and the sealing performance of the main sealing pair of the valve is improved. , while reducing the possibility of failure of the primary seal pair.

Description

Main sealing pair plane double sealing structure for stop valve

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

1. A double sealing structure of a main sealing pair for a shut-off valve, characterized in that it comprises a valve body (1), a valve cover (10) is arranged at the top of the valve body (1), and a valve body (1) and a valve cover ( 10) A valve flap (4) is arranged in the formed cavity, and a sealing structure is arranged at the position where the bottom end of the valve flap (4) contacts the valve body (1).

2. The double sealing structure of the main sealing pair for a shut-off valve as claimed in claim 1, characterized in that: the sealing structure comprises a pressing ring I(5), and the pressing ring I(5) is annular , is arranged around the valve disc (4), and the bottom end of the pressing ring I (5) is provided with a fixing piece (2), which separates the pressing ring I (5) from the valve body (1), and fixes the fixing piece (2). The sheet (2) is provided with a protrusion facing the axial direction of the valve disc (4), a C-shaped ring (3) is arranged around the protrusion, and the protrusion of the fixing sheet (2) extends into the interior of the C-shaped ring (3), and the C-shaped ring (3) is arranged around the protrusion. The highest part of the ring (3) is in contact with the valve disc (4), and the C-ring (3) is arranged in the groove reserved in the valve body (1).

3. The double sealing structure of the main sealing pair for a shut-off valve as claimed in claim 2, characterized in that: it further comprises a pressing ring II (6), the pressing ring II (6) is annular and is arranged on the pressure Above the tight ring I(5).

4. The double-seal structure of the main seal pair for a shut-off valve as claimed in claim 3, characterized in that it further comprises a pressure ring (9), and the pressure ring (9) is arranged above the pressure ring II (6). , the top of the pressure ring (9) is the valve cover (10), so that the pressure ring (9) presses the pressure ring II (6), the pressure ring II (6) presses the pressure ring I (5), and press The ring I (5) presses the fixing piece (2) again, and the fixing piece (2) is inserted into the opening of the C-ring (3) to fix the C-ring (3) on the valve body.

5. The double sealing structure of the main sealing pair of the shut-off valve according to claim 4, characterized in that: it further comprises a middle cavity gasket (8), and the middle cavity gasket (8) is arranged on the pressure ring (9). ) and the valve body (1).

6. The double-seal structure of the main seal pair for a shut-off valve according to claim 5, characterized in that: it further comprises a middle flange bolt (7), which is used for connecting the valve body (7). 1) Fixed connection with the valve cover (10).

7 . The double sealing structure of the main sealing and auxiliary planes for a shut-off valve as claimed in claim 6 , wherein the depth of the groove of the valve body is set as required, and the depths of different grooves correspond to different degrees of sealing. 8 .

8. The double sealing structure of the main sealing pair for a shut-off valve as claimed in claim 7, wherein the valve body (1) and the valve disc (4) are both provided with metal sealing surfaces and surfacing Stellite hard quality alloy.