CN214466350U

CN214466350U - Axial-flow check valve with in-service test structure

Info

Publication number: CN214466350U
Application number: CN202022197339.9U
Authority: CN
Inventors: 苏丽华; 高志岗; 顾春辉; 刘平; 卢安乐; 陈时健; 乐秀辉
Original assignee: CNNC Sufa Technology Industry Co Ltd
Current assignee: CNNC Sufa Technology Industry Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-10-22
Anticipated expiration: 2030-09-30

Abstract

The utility model relates to a check valve technical field, concretely relates to axial-flow type check valve with in-service test structure. The utility model provides an axial-flow check valve with in-service test structure, wherein, includes the valve body, is equipped with the cavity in the middle of the valve body, is equipped with telescopic case in the cavity. This neotype advantage lies in: this patent at the test of labour structure, through the compound mode of test port, pressure-relief valve and piston isotructure, developed the test of labour structure at the axial flow type check valve, its structural design is reasonable, simple structure, reliable operation.

Description

Axial-flow check valve with in-service test structure

Technical Field

The utility model relates to a check valve technical field, concretely relates to axial-flow type check valve with in-service test structure.

Background

The axial flow check valve for nuclear power is used for million-million advanced pressurized water reactor nuclear power units. The system is mainly applied to passive reactor core cooling, steam generator and spent fuel pool cooling and other systems, belongs to key equipment of a primary loop system, and is widely applied to third-generation nuclear power units.

The research on the axial flow check valve for the nuclear power in China is still in a primary stage, at present, the valve is supplied by foreign manufacturers, and no alternative supplier exists in China. The method has the disadvantages of high equipment price, long supply period, slow on-site response and the like. Therefore, the nuclear grade axial flow check valve needs to be researched and developed domestically, and the monopoly of foreign enterprises is broken.

SUMMERY OF THE UTILITY MODEL

This novel aim at is to prior art's defect, provides one kind and has at the experimental structure axial-flow type check valve of labour.

This is novel to realize like this: the utility model provides an axial-flow check valve with in-service test structure, wherein, includes the valve body, is equipped with the cavity in the middle of the valve body, is equipped with telescopic case in the cavity.

As above a have at experimental structure axial-flow check valve of labour, wherein, the telescopic case include with valve body fixed connection's kuppe, be equipped with the through-hole in the middle of the kuppe, set up the piston in the through-hole, piston and valve rod fixed connection, the kuppe is equipped with the valve clack outward, the terminal fixed connection that valve clack and valve rod stretched out, the shape of valve clack outward flange and the shape phase-match of valve body inner wall, when the kuppe is hugged closely to the valve clack, leave the space between valve clack and the valve body, when the kuppe was kept away from to the valve clack, seal between valve clack and the valve body.

The axial flow check valve with the in-service test structure comprises a valve body, a valve clack, a guide cover, a valve body, a valve clack, a valve body, a valve core, a valve rod and a check valve.

The axial flow check valve with the in-service test structure is characterized in that a guide sleeve is arranged in the through hole of the guide sleeve, and the valve rod is arranged in the guide sleeve.

The axial flow check valve with the in-service test structure is characterized in that a piston ring, a check washer and a nut are further arranged at the position where the piston is connected with the valve rod.

The axial flow check valve with the in-service test structure is characterized in that a spring is sleeved on the valve rod.

The axial flow check valve with the in-service test structure is characterized in that the free end of the air guide sleeve through hole is provided with the screw cap.

The axial flow check valve with the in-service test structure is characterized in that a positioning screw and a check ring are arranged at the position where the guide sleeve is connected with the valve body.

The axial flow check valve with the in-service test structure is characterized in that a pressure relief valve is arranged on the side wall of the valve body and used for controlling the opening and closing of a pressure relief channel.

An axial flow check valve with in-service test structure as described above, wherein the valve body side wall has a test port for testing.

This neotype advantage lies in: this patent at the test of labour structure, through the compound mode of test port, pressure-relief valve and piston isotructure, developed the test of labour structure at the axial flow type check valve, its structural design is reasonable, simple structure, reliable operation.

Drawings

FIG. 1 is a schematic view (open position) of the novel axial flow check valve with in-service test structure

FIG. 2 is a schematic view of the novel axial flow check valve with in-service test structure (closed position)

In the figure: 1. a valve body; 2. a valve flap; 3. a pod; 4. a pressure relief valve; 5. a test port; 6. a set screw; 7. a retainer ring; 8, connecting a connecting pipe; 9. a screw cap; 10. a nut; 11 a lock washer; 12 a piston ring; 13. a piston; 14. a bushing; 15. a spring; 16. a guide sleeve; 17. valve rod

The specific implementation mode is as follows:

the patent is described in further detail below with reference to the figures and the embodiments.

As shown in fig. 1 and 2: an axial flow check valve with an in-service test structure comprises a valve clack 2, a valve rod 17, a spring 16, a piston 13, a screw cap 9 and other parts which are assembled on a flow guide cover 3 firstly and then are integrally installed in a valve body 1, then the flow guide cover is fixed by a positioning screw 6 and a check ring 7, and finally a connecting pipe 8 is welded. The check valve is a normally open check valve and has the characteristics of high circulation, long service life, capability of in-service detection and test and the like.

As shown in fig. 1 and 2: a piston 13 is arranged on the valve rod 17, a piston cavity is formed by the piston ring 12 and the bushing 14, and the valve clack 2 is pushed to be attached to the valve seat by pressing the piston cavity to realize closing; the valve rod 17 is provided with a spring 14 which provides resilience for the valve clack 2, and the spring 14 rebounds to enable the valve clack 2 to be separated from the valve seat in the opposite direction to realize opening.

As shown in fig. 1 and 2: set up pressure relief valve 4 and test port 5 on 1 upper portion of valve body, set up the water injection hole on kuppe 3, close pressure relief valve 4 on 1 upper portion of valve body when the labour test, shield the pressure relief hole, pass through the water injection hole injection piston intracavity on kuppe 3 with the medium through test port 5, piston 13 promotes valve clack 2 and disk seat laminating realization sealed. When the valve operates, the pressure relief valve 4 needs to be opened, so that the pressure of the piston cavity and the main valve flow channel is balanced, and the opening and closing of the valve clack 2 are not influenced by the piston effect.

As shown in fig. 1 and 2: the sealing structure of the piston 13 is sealed by a metal piston ring 12, and the surface of the metal piston ring 12 is plated with chrome, so that the service life can be prolonged. The anti-loose structure of the piston 13 adopts a double anti-loose structure with an anti-loose gasket 11 and double nuts 10, and the structure has reliable loosening effect.

Claims

1. The utility model provides an axial-flow type check valve with test structure in service which characterized in that: the valve comprises a valve body (1), wherein a cavity is arranged in the middle of the valve body (1), and a telescopic valve core is arranged in the cavity.

2. The axial flow check valve with in-service test structure of claim 1, wherein: the telescopic valve core comprises a flow guide cover (3) fixedly connected with a valve body (1), a through hole is formed in the middle of the flow guide cover (3), a piston (13) is arranged in the through hole, the piston (13) is fixedly connected with a valve rod (17), a valve clack (2) is arranged outside the flow guide cover (3), the valve clack (2) is fixedly connected with the extending end of the valve rod (17), the shape of the outer edge of the valve clack (2) is matched with that of the inner wall of the valve body (1), when the valve clack (2) is tightly attached to the flow guide cover (3), a gap is reserved between the valve clack (2) and the valve body (1), and when the valve clack (2) is far away from the flow guide cover (3), the valve clack (2) and the valve body (1) are sealed.

3. The axial flow check valve with in-service test structure of claim 2, wherein: the cross section of the valve clack (2) is umbrella-shaped, the top end of the umbrella-shaped valve clack faces the normal flow direction of liquid in the valve body (1), when the flow direction of the liquid in the valve body (1) is the same as the designed flow direction, the valve clack (2) is squeezed by fluid and is attached to the air guide sleeve (3), and when the flow direction of the liquid in the valve body (1) is opposite to the designed flow direction, the valve clack (2) is squeezed by the fluid and is attached to the inner wall of the valve body (1).

4. The axial flow check valve with in-service test structure of claim 3, wherein: a guide sleeve (16) is arranged in a through hole of the air guide sleeve (3), and the valve rod (17) is arranged in the guide sleeve (16).

5. The axial flow check valve with in-service test structure of claim 4, wherein: the position where the piston (13) is connected with the valve rod (17) is also provided with a piston ring (12), a check washer (11) and a nut (10).

6. The axial flow check valve with in-service test structure of claim 5, wherein: the valve rod (17) is sleeved with a spring (15).

7. The axial flow check valve with in-service test structure of claim 6, wherein: a screw cap (9) is arranged at the free end of the through hole of the air guide sleeve (3).

8. The axial flow check valve with in-service test structure of claim 7, wherein: and a positioning screw (6) and a check ring (7) are arranged at the position where the air guide sleeve (3) is connected with the valve body (1).

9. The axial flow check valve with in-service test structure of claim 8, wherein: the side wall of the valve body (1) is provided with a pressure relief valve (4), and the pressure relief valve (4) is used for controlling the opening and closing of the pressure relief channel.

10. The axial flow check valve with in-service test structure of claim 9, wherein: the side wall of the valve body (1) is provided with a test port (5), and the test port (5) is used for testing.