CN107515079A - A detection device for the sealing performance of ball and valve seat in ball valve - Google Patents

Abstract

The present invention relates to the detection means of spheroid and valve base seal property in a kind of ball valve, for detecting the sealing between tested valve seat and tested spheroid, detection means includes pedestal, bushing pipe, briquetting and pressing plate, pedestal includes cavity penetrating up and down, upper junction plate and lower connecting plate positioned at chamber outer wall, and a supporting table is provided with cavity；Bushing pipe is set in the cavity of pedestal, for supporting tested valve seat；Briquetting is connected with pressing plate, and lower surface is sphere, for compressing tested spheroid；Pressing plate is connected with briquetting, while is connected by the upper junction plate of upper stud and top nut and pedestal；In use, by tested valve seat supports on bushing, tested spheroid is placed on tested valve seat detection means, and compression block compresses above tested spheroid, by pedestal be placed on it is valve test bed detected, or pedestal connection blind plate is detected.Compared with prior art, the present invention has the advantages that simple in construction, easy to use, detection accuracy is high, detection efficiency is high.

Description

A detection device for the sealing performance of ball and valve seat in ball valve

technical field

The invention relates to a testing device for a ball valve, in particular to a testing device for the sealing performance between a ball and a valve seat in a ball valve.

Background technique

Ball valves are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries, and occupy a pivotal position in the national economy. It has the action of rotating 90 degrees. The cock body is a sphere with a circular through hole or channel passing through its axis.

The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to be rotated 90 degrees and a small rotational torque can be closed tightly. When the ball valve is used, the sealing performance requirements between the ball and the valve seat must be met, that is, the ball and the valve seat need to be completely sealed. In the ball valve manufacturing process, the ball and the valve seat are usually assembled separately and then used together, and the inspection of the ball valve needs to be completed after the ball and the valve seat are assembled, and then the sealing performance of the ball valve is tested, and if the ball and the valve When the tightness of the seat does not meet the requirements, the ball valve can be disassembled to further adjust the structure of the ball or seat so that the tightness of the ball valve can meet the requirements.

Therefore, there is currently a lack of a device that detects the tightness of the ball and the valve seat before the ball valve is assembled, so as to improve work efficiency and reduce the number of assembly and disassembly of the ball valve.

Contents of the invention

The object of the present invention is to provide a detection device for the sealing performance between the ball and the valve seat in a ball valve with simple structure, convenient use, high detection accuracy and high detection efficiency in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A detection device for the sealing performance of a ball and a valve seat in a ball valve, which is used to detect the sealing performance between a tested valve seat and a tested ball, and the detection device includes:

Base: including the upper and lower transparent cavity, the upper connection plate and the lower connection plate located on the outer wall of the cavity, and a support platform is arranged in the cavity;

Liner: sleeved in the cavity of the base and supported by the support platform of the base to support the tested valve seat;

Compression block: connected with the pressure plate, and the lower surface is a spherical surface, which is used to compress the measured sphere;

Pressure plate: connected with the pressure block, and connected with the upper connecting plate of the base through the upper stud and the upper nut at the same time;

When the testing device is in use, the tested valve seat is supported on the bushing, the tested ball is placed on the tested valve seat, and the top of the tested ball is pressed by the pressure block, and the base is placed on the valve test bench for testing, or Connect the base to the blind plate for testing.

The inside of the liner is provided with a support platform, a spring is provided on the support platform of the liner, and a support ring is provided on the spring, and the measured valve seat is placed on the support ring.

The liner can be replaced to adapt to testing balls of different specifications and matching valve seats.

The inner wall of the liner is smooth, and a third O-ring is arranged at the position where the liner is in contact with the tested valve seat.

A retaining ring is arranged above the liner, the lower side of the retaining ring presses the liner, the outer wall of the retaining ring is closely attached to the inner wall of the base, and the inner wall of the retaining ring is closely attached to the outer wall of the valve seat to be tested. The upper and lower ends of the liner are respectively restricted by the retaining ring and the supporting platform of the base to be fixed in the vertical direction.

The outer wall of the liner is arranged in close contact with the inner wall of the base, and a second O-ring is arranged at the position where the liner is in contact with the inner wall of the base.

The first way of using the detection device of the present invention is to place the base on the valve test bench for detection, directly connect and fix the lower connecting plate of the base with the valve test bench, and seal between the tested valve seat and the tested ball Sex detection.

The second way of using the detection device of the present invention is to connect the base with the blind plate to detect the tightness between the tested valve seat and the tested ball, the blind plate passes through the lower stud and the lower nut and the base. The lower connection plate is connected, and the blind plate, the inner wall of the base, the measured valve seat and the measured ball form a sealed cavity, and the blind plate is provided with an air inlet for introducing high-pressure gas into the sealed cavity. .

A first O-ring is provided at the joint between the blind plate and the base.

When using the second mode of use of the detection device of the present invention, tighten the upper nut, apply a prescribed preload to the ball under test through the pressure plate and the pressure block, and apply a leak detection agent at the joint between the ball under test and the valve seat under test. , through the air inlet to introduce high-pressure gas, by establishing the required pressure in the sealed cavity and maintaining the specified time to detect the leakage at the joint of the tested ball and the tested valve seat, if the combination of the tested ball and the tested valve seat Bubbles appear in the leak-picking agent at the position, indicating that the sealing performance between the ball and the valve seat is poor, which does not meet the requirements; The sealing performance between them is good and meets the testing requirements.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The detection device of the present invention is easy to use, and the sealing performance between the ball and the valve seat of the ball valve can be detected before the ball valve is assembled, and there is no need to test the sealing performance of the ball valve after assembly, so the detection efficiency is greatly improved.

2. When the detection device of the present invention is in use, the spheroid and the valve seat are easy to install, and the detection can be carried out by an auxiliary valve test bench, or the sealing performance between the spheroid and the valve seat can be detected by passing high-pressure gas through the blind plate, so , the device of the invention is convenient to use and has high detection accuracy.

Description of drawings

Fig. 1 is a schematic structural diagram of the detection device of the present invention.

Symbols in the figure: 1, lower stud, 2, lower nut, 3, blind plate, 4, first O-ring, 5, base, 6, second O-ring, 7, liner, 8, spring, 9. Support ring, 10. Third O-ring, 11. Tested valve seat, 12. Retainer ring, 13. Tested ball, 14. Press block, 15. Press plate, 16. Upper stud, 17. Upper nut , 18, air inlet.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

A detection device for the sealing performance of a ball and a valve seat in a ball valve, as shown in Figure 1, is used to detect the sealing performance between a tested valve seat 11 and a tested ball 13, and the detection device includes a base 5, a liner 7, The briquetting block 14 and the pressing plate 15, the base 5 include a transparent cavity up and down, an upper connection plate and a lower connection plate located on the outer wall of the cavity, and a support platform is arranged in the cavity; the liner 7 is sleeved in the cavity of the base 5 In the body, and supported by the support platform of the base 5, it is used to support the tested valve seat 11; the pressure block 14 is connected with the pressure plate 15, and the lower surface is a spherical surface, which is used to compress the measured ball 13; the pressure plate 15 and the pressure block 14 connected, and at the same time connected with the upper connecting plate of the base 5 through the upper stud 16 and the upper nut 17; when the detection device is in use, the tested valve seat 11 is supported on the bushing 7, and the tested ball 13 is placed on the tested valve seat 11, and the top of the tested ball 13 is pressed by the pressure block 14, the base 5 is placed on the valve test bench for testing, or the base 5 is connected to the blind plate 3 for testing.

Specifically, a support platform is provided inside the liner 7 , a spring 8 is provided on the support platform of the liner 7 , a support ring 9 is provided on the spring 8 , and the test valve seat 11 is placed on the support ring 9 . The liner 7 can be replaced to adapt to testing balls of different specifications and matching valve seats. The inner wall of the liner 7 is a smooth surface, and a third O-ring 10 is arranged at the position where the liner 7 is in contact with the valve seat 11 to be tested. A retaining ring 12 is arranged above the liner 7, and the lower side of the retaining ring 12 presses the liner 7. The outer wall of the retaining ring 12 is closely attached to the inner wall of the base 5, and the inner wall of the retaining ring 12 is closely attached to the outer wall of the tested valve seat 11. It is set so that the upper and lower ends of the liner 7 are respectively restricted by the retaining ring 12 and the support platform of the base 5 and fixed in the vertical direction. The outer wall of the liner 7 is arranged in close contact with the inner wall of the base 5 , and a second O-ring 6 is arranged at the position where the liner 7 contacts the inner wall of the base 5 .

The first way of using the detection device is to place the base 5 on the valve test bench for detection, directly connect and fix the lower connecting plate of the base 5 with the valve test bench, and perform the test between the valve seat 11 and the ball 13 to be tested. Between leak detection.

The second way of using the detection device is to connect the base 5 with the blind plate 3 to detect the tightness between the tested valve seat 11 and the tested ball 13, the blind plate 3 is connected with the lower stud 1 and the lower nut 2 The lower connection plate of the base 5 is connected, and a first O-ring 4 is provided at the joint between the blind plate 3 and the base 5 . And the blind plate 3 , the inner wall of the base 5 , the tested valve seat 11 and the tested ball 13 enclose a sealed cavity, and the blind plate 3 is provided with an air inlet 18 for feeding high-pressure gas into the sealed cavity.

When the detection device is used in the second mode of use, tighten the upper nut 17, and give the tested ball 13 a prescribed preload through the pressure plate 15 and the pressure block 14. At the junction of the tested ball 13 and the tested valve seat 11 Apply leak detection agent, pass high-pressure gas through the air inlet 18, establish the required pressure in the sealed cavity and maintain it for a specified time to detect the leakage at the junction of the tested ball 13 and the tested valve seat 11.

The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (8)

1. the detection means of spheroid and valve base seal property in a kind of ball valve, for detect tested valve seat (11) with Sealing between tested spheroid (13), it is characterised in that described detection means includes：

Pedestal (5)：Including cavity penetrating up and down, upper junction plate and lower connecting plate positioned at chamber outer wall, in chamber It is provided with a supporting table in vivo；

Bushing pipe (7)：It is set in the cavity of pedestal (5), and is supported by the supporting table of pedestal (5), for props up The tested valve seat (11) of support；

Briquetting (14)：It is connected with pressing plate (15), and lower surface is sphere, for compressing tested spheroid (13)；

Pressing plate (15)：It is connected with briquetting (14), while passes through upper stud (16) and top nut (17) and base The upper junction plate connection of seat (5)；

Detection means in use, tested valve seat (11) is supported on bushing (7), put by tested spheroid (13) Put on tested valve seat (11), and compression block (14) compresses above tested spheroid (13), by pedestal (5) Be placed on it is valve test bed detected, or by pedestal (5) connect blind plate (3) detected.

2. the detection means of spheroid and valve base seal property in a kind of ball valve according to claim 1, it is special Sign is, is provided with supporting table on the inside of described bushing pipe (7), spring (8) is provided with the supporting table of bushing pipe (7), Spring (8) is provided with support ring (9), and described tested valve seat (11) is placed on support ring (9).

3. the detection means of spheroid and valve base seal property in a kind of ball valve according to claim 1, it is special Sign is that described bushing pipe (7) inwall is shiny surface, is in contact in bushing pipe (7) with tested valve seat (11) Position is provided with the 3rd O-ring (10).

4. the detection means of spheroid and valve base seal property in a kind of ball valve according to claim 1, it is special Sign is, is provided with back-up ring (12) above described bushing pipe (7), described back-up ring pushes down lining on the downside of (12) Manage (7), the outer wall of back-up ring (12) is close to set with pedestal (5) inwall, and the inwall of back-up ring (12) is with being tested Valve seat (11) outer wall is close to set so that the upper and lower ends of bushing pipe (7) are respectively by back-up ring (12) and pedestal (5) Supporting table limitation and fix in the vertical direction.

5. the detection means of spheroid and valve base seal property in a kind of ball valve according to claim 1, it is special Sign is that the outer wall of described bushing pipe (7) is close to set with pedestal (5) inwall, and in bushing pipe (7) and base The position that seat (5) inwall is in contact is provided with the second O-ring (6).

6. the detection means of spheroid and valve base seal property in a kind of ball valve according to claim 1, it is special Sign is, when pedestal (5) is placed on into valve test bed detected, directly by the lower connecting plate of pedestal (5) It is connected with valve test bed, carries out tested sealing propertytest between valve seat (11) and tested spheroid (13).

7. the detection means of spheroid and valve base seal property in a kind of ball valve according to claim 1, it is special Sign is, pedestal (5) is connected with blind plate (3) and be tested between valve seat (11) and tested spheroid (13) Sealing propertytest when, described blind plate (3) passes through lower stud (1) and lower nut (2) and pedestal (5) Lower connecting plate connects, and described blind plate (3), pedestal (5) inwall, tested valve seat (11) and tested spheroid (13) seal cavity is surrounded, is opened up on described blind plate (3) and entering for gases at high pressure is passed through in oriented seal cavity Gas port (18).

8. the detection means of spheroid and valve base seal property in a kind of ball valve according to claim 7, it is special Sign is that described blind plate (3) is provided with the first O-ring (4) with pedestal (5) junction.