Device for detecting sealing performance of fixed ball valve

Abstract

The utility model discloses a device for detecting the sealing performance of a fixed ball valve, which relates to the technical field of ball valves and comprises two flange plates in sealing fit with flow channels of the fixed ball valve and a bottom cover arranged at the bottom end of the fixed ball valve, at least one flange plate is provided with a first test hole communicated with the corresponding flow channel of the flange plate, and a second test hole communicated with the corresponding flow channel of the flange plate is arranged on the bottom cover. The first test hole is connected with a gas cylinder through a first connecting pipe, the bottom cover is provided with a second test hole communicated with the middle cavity of the fixed ball valve, and the second test hole is connected with a bubble detection bottle through a second connecting pipe. According to the scheme, the sealing performance of the fixed ball valve can be detected to the maximum precision, and the production qualification rate of the fixed ball valve is improved. And the detection device is simple in structure, convenient to mount and dismount, visual in detection result and low in detection cost.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a sealing performance detection device for fixed ball valves. Background Art

[0002] Ball valves are commonly used opening and closing parts for gas or liquid circulation. They are generally used in two important industries: gas pipelines and water conservancy transportation. Therefore, they need to be tested for sealing before leaving the factory, otherwise there will be major safety hazards. Conventional ball valves and anti-corrosion ball valves made of polymer materials must have zero internal leakage, and ultra-low temperature ball valves and high-temperature hard-sealed ball valves require close to zero leakage, or even zero leakage. Therefore, how to achieve sealing at each sealing part inside the valve and accurately grasp the leakage amount to make improvements when there is leakage is very important to ensure the performance of the above valves. The conventional fixed ball valve sealing performance detection device is to pressurize the flow channel on one side of the fixed ball valve and detect leaks on the flow channel on the other side. When there is a slight leak between any flow channel of the fixed ball valve and the middle cavity of the fixed ball valve, the conventional detection device cannot detect it, resulting in a decrease in the detection accuracy of the detection device.

[0003] For example, Chinese patent publication number CN105092233A, publication date November 25, 2015, entitled "A ball valve testing machine for both air tightness test and torque test", includes a stand, wherein a fixed sealing cover is provided on one side of the stand, a movable sealing cover which can be translated toward the fixed sealing cover is provided on the opposite side of the fixed sealing cover, and a translation drive mechanism is provided on the rear side of the movable sealing cover; at least one of the fixed sealing cover and the movable sealing cover is provided with a test air hole; a torque testing mechanism is also provided inside the stand, and the torque testing mechanism is located between the fixed sealing cover and the movable sealing cover, and the torque testing mechanism includes a slide which can slide between the two sealing covers, and a bracket for positioning the ball valve is also provided on the slide.

[0004] The disadvantage of the existing patent is that the conventional trunnion ball valve sealing performance detection device is to pressurize the flow channel on one side of the trunnion ball valve and detect leakage on the flow channel on the other side. When there is a slight leakage between any flow channel of the trunnion ball valve and the middle cavity of the trunnion ball valve, the conventional detection device cannot detect it, resulting in a reduction in the detection accuracy of the detection device. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the existing fixed ball valve sealing performance detection device is unable to detect the sealing performance between the flow channel and the middle cavity of the fixed ball valve, and to provide a fixed ball valve sealing performance detection device which can detect the sealing performance between the flow channel and the middle cavity of the fixed ball valve and improve the detection accuracy.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A fixed ball valve sealing performance detection device comprises two flange plates sealed with the flow channel of the fixed ball valve and a bottom cover arranged at the bottom end of the fixed ball valve, at least one flange plate is provided with a first test hole connected to the corresponding flow channel of the flange plate, the first test hole is connected to the gas cylinder through a first connecting pipe, the bottom cover is provided with a second test hole connected to the middle cavity of the fixed ball valve, and the second test hole is connected to a bubble detection bottle through a second connecting pipe. A fixed ball valve sealing performance detection device described in this scheme, two flange plates are respectively sealed with the flow channel of the fixed ball valve, and the bottom cover is arranged at the bottom end of the fixed ball valve. At least one flange plate is connected to the gas cylinder through a first connecting pipe, and the bottom cover is connected to the bubble detection bottle through a second connecting pipe. The gas cylinder presses the flow channel corresponding to the flange plate into the inside of the fixed ball valve through the first connecting pipe, and the bubble detection bottle detects whether bubbles appear. If bubbles appear, there is leakage in the flow channel and the middle cavity (i.e., the cavity formed between the valve body and the ball of the fixed ball valve, and the middle cavity and any flow channel should remain sealed); if no bubbles appear, there is no leakage in the flow channel and the middle cavity. After the test is completed, check whether there is leakage between the other flow channel and the middle cavity. When there is no leakage between any flow channel and the middle cavity, there is also no leakage between the flow channels, and the sealing performance of the fixed ball valve is excellent. Therefore, a fixed ball valve sealing performance detection device in this scheme can detect the sealing performance of the fixed ball valve with the highest accuracy and improve the production qualification rate of the fixed ball valve. In addition, the detection device has a simple structure, is easy to install and disassemble, the detection results are intuitive, and the detection cost is low.

[0008] Preferably, the first connecting pipe is provided with a first manual ball valve for opening and closing the first connecting pipe, and the second connecting pipe is provided with a second manual ball valve for opening and closing the second connecting pipe. The first manual ball valve realizes the opening and closing of the first connecting pipe, and the second manual ball valve realizes the opening and closing of the second connecting pipe. Before the sealing performance test, the first manual ball valve and the second manual ball valve are both closed. After the detection device and the fixed ball valve are installed, the first manual ball valve and the second manual ball valve are opened.

[0009] Preferably, the first connecting pipe includes a first pressure test pipe and a first air pipe, one end of the first pressure test pipe is connected to the first test hole on the flange plate, and the other end is connected to the first manual ball valve; one end of the first air pipe is connected to the first manual ball valve, and the other end is connected to the gas cylinder. There are multiple ways to connect the first pressure test pipe, the flange plate, and the first manual ball valve, one of which is that one end of the first pressure test pipe is welded to the flange plate, and the other end is welded to the first manual ball valve.

[0010] Preferably, the second connecting pipe includes a second pressure test pipe and a second air pipe, one end of the second pressure test pipe is connected to the second test hole on the bottom cover, and the other end is connected to the second manual ball valve; one end of the second air pipe is connected to the second manual ball valve, and the other end is connected to the bubble detection bottle. There are many ways to connect the second pressure test pipe to the flange plate and the second manual ball valve, and one implementation is that one end of the second pressure test pipe is welded to the flange plate, and the other end is welded to the second manual ball valve.

[0011] Preferably, a pressure gauge is further included, and the pressure gauge is connected to the first air pipe and is used to detect the pressure value of the gas cylinder.

[0012] Preferably, a stop valve is provided on the first connecting pipe, and the stop valve is located at one end of the first connecting pipe close to the gas cylinder. The stop valve is used to ensure that the gas cylinder is completely closed to prevent leakage of the gas cylinder on the one hand; on the other hand, it is used to adjust the pressure value of the gas cylinder on the flow channel to adjust the flow rate. Implementation method one: A stop valve is provided on the first gas pipe, and the stop valve is located at one end of the first gas pipe close to the gas cylinder, and the pressure gauge is located between the stop valve and the first manual ball valve.

[0013] Preferably, the flange plate is locked on the flow channel end surface of the fixed ball valve by a locking member, so that the flange plate and the flow channel are sealed and matched.

[0014] Preferably, a sealing component is provided between the flange plate and the flow channel end face of the fixed ball valve, wherein the sealing component improves the sealing performance between the flow channel and the flange plate, and prevents leakage between the flow channel and the outside during detection.

[0015] Preferably, the sealing assembly is an O-ring, and the number of the O-rings is multiple. The multiple O-rings are coaxially arranged to improve the sealing performance between the flow channel and the flange plate, and prevent leakage between the flow channel and the outside during detection.

[0016] Preferably, the base also includes a base support leg, which is locked to the lower end of the fixed ball valve through a locking member. The base support leg is locked to the lower end of the fixed ball valve through the locking member and the flange plate at the same time, playing the role of supporting the fixed ball valve, making it convenient for the second connecting pipe to connect to the bottom cover.

[0017] Therefore, the utility model has the following beneficial effects: the sealing performance of the fixed ball valve can be detected with the highest accuracy, and the production qualification rate of the fixed ball valve can be improved. Moreover, the detection device has a simple structure, convenient installation and disassembly, intuitive detection results, and low detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the second embodiment of the utility model.

[0020] Figure 3 It is a cross-sectional view of the bottom cover, the second pressure test tube and the second manual ball valve in the utility model.

[0021] As shown in the figure:

[0022] Fixed ball valve 1, flow channel 1.1, middle cavity 1.2,

[0023] Flange plate 2, first test hole 2.1,

[0024] Bottom cover 3, second test hole 3.1,

[0025] first connecting pipe 4, first pressure test pipe 4.1, first air pipe 4.2,

[0026] The second connecting pipe 5, the second pressure test pipe 5.1, the second air pipe 5.2,

[0027] Gas cylinder 6, bubble detection bottle 7, first manual ball valve 8, second manual ball valve 9, pressure gauge 10, stop valve 11, locking piece 12, sealing assembly 13, base support foot 14, sealing plug 15. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Embodiment 1, as Figure 1 , Figure 3 A sealing performance detection device for a fixed ball valve 1 is shown, comprising two flange plates 2 sealingly matched with the flow channel 1.1 of the fixed ball valve 1 and a bottom cover 3 arranged at the bottom end of the fixed ball valve 1, at least one flange plate 2 is provided with a first test hole 2.1 connected to the corresponding flow channel 1.1 of the flange plate 2, the first test hole 2.1 is connected to the gas cylinder 6 through a first connecting pipe 4, and the bottom cover 3 is provided with a second test hole 3.1 connected to the middle cavity 1.2 of the fixed ball valve 1, and the second test hole 3.1 is connected to the bubble detection bottle 7 through a second connecting pipe 5.

[0030] In the above embodiment, a sealing performance detection device for a fixed ball valve 1 is provided, wherein two flange plates 2 are respectively sealed with the flow channel 1.1 of the fixed ball valve 1, and a bottom cover 3 is arranged at the bottom end of the fixed ball valve 1. At least one flange plate 2 is connected to a gas cylinder 6 through a first connecting pipe 4, and the bottom cover 3 is connected to a bubble detection bottle 7 through a second connecting pipe 5. The gas cylinder 6 presses the flow channel 1.1 corresponding to the flange plate 2 into the interior of the fixed ball valve 1 through the first connecting pipe 4, and the bubble detection bottle 7 detects whether bubbles appear. If bubbles appear, there is leakage in the flow channel 1.1 and the middle cavity 1.2 (i.e., the cavity formed between the valve body and the ball of the fixed ball valve 1, and the middle cavity 1.2 and any one of the flow channels 1.1 should remain sealed); if no bubbles appear, there is no leakage in the flow channel 1.1 and the middle cavity 1.2. After the detection is completed, it is detected whether there is leakage between another flow channel 1.1 and the middle cavity 1.2. When there is no leakage between any flow channel 1.1 and the middle cavity 1.2, there is also no leakage between the flow channels 1.1, and the sealing performance of the fixed ball valve 1 is excellent. Therefore, a sealing performance detection device for a fixed ball valve 1 in this scheme can detect the sealing performance of the fixed ball valve 1 with the greatest accuracy, thereby improving the production qualification rate of the fixed ball valve 1. Moreover, the detection device has a simple structure, is easy to install and disassemble, has intuitive detection results, and has low detection costs. This solves the problem that the conventional sealing performance detection device for a fixed ball valve 1 presses the flow channel 1.1 on one side of the fixed ball valve 1 and detects leaks in the flow channel 1.1 on the other side. When there is a slight leakage between any flow channel 1.1 of the fixed ball valve 1 and the middle cavity 1.2 of the fixed ball valve 1, the conventional detection device cannot detect it, resulting in a reduced detection accuracy of the detection device.

[0031] The bubble detection bottle 7 is an alcohol bottle filled with alcohol, and one end of the first connecting tube 4 extends into the alcohol in the alcohol bottle.

[0032] In this embodiment, Figure 1 As shown, the first connecting pipe 4 is provided with a first manual ball valve 8 for opening and closing the first connecting pipe 4, and the second connecting pipe 5 is provided with a second manual ball valve 9 for opening and closing the second connecting pipe 5. The first manual ball valve 8 realizes the opening and closing of the first connecting pipe 4, and the second manual ball valve 9 realizes the opening and closing of the second connecting pipe 5. Before the sealing performance test, the first manual ball valve 8 and the second manual ball valve 9 are both closed. After the detection device and the fixed ball valve 1 are installed, the first manual ball valve 8 and the second manual ball valve 9 are opened.

[0033] Specifically, Figure 1As shown, the first connecting pipe 4 includes a first pressure test pipe 4.1 and a first air pipe 4.2. One end of the first pressure test pipe 4.1 is connected to the first test hole 2.1 on the flange plate 2, and the other end is connected to the first manual ball valve 8; one end of the first air pipe 4.2 is connected to the first manual ball valve 8, and the other end is connected to the gas cylinder 6. There are many ways to connect the first pressure test pipe 4.1, the flange plate 2, and the first manual ball valve 8. One implementation method is that one end of the first pressure test pipe 4.1 is welded to the flange plate 2, and the other end is welded to the first manual ball valve 8. Figure 1 As shown, the second connecting pipe 5 includes a second pressure test pipe 5.1 and a second air pipe 5.2. One end of the second pressure test pipe 5.1 is connected to the second test hole 3.1 on the bottom cover 3, and the other end is connected to the second manual ball valve 9; one end of the second air pipe 5.2 is connected to the second manual ball valve 9, and the other end is connected to the bubble detection bottle 7. There are many ways to connect the second pressure test pipe 5.1, the flange plate 2, and the second manual ball valve 9. One implementation is that one end of the second pressure test pipe 5.1 is welded to the flange plate 2, and the other end is welded to the second manual ball valve 9.

[0034] Further, such as Figure 1 As shown, it also includes a pressure gauge 10, which is connected to the first gas pipe 4.2 and is used to detect the pressure value of the gas cylinder 6.

[0035] Further, such as Figure 1 As shown, a stop valve 11 is provided on the first connecting pipe 4, and the stop valve 11 is located at one end of the first connecting pipe 4 close to the gas cylinder 6. The stop valve 11 is used to ensure that the gas cylinder 6 is completely closed to prevent leakage of the gas cylinder 6; on the other hand, it is used to adjust the pressure value of the gas cylinder 6 on the flow channel 1.1 to adjust the flow rate. Implementation method 1: A stop valve 11 is provided on the first gas pipe 4.2, and the stop valve 11 is located at one end of the first gas pipe 4.2 close to the gas cylinder 6, and the pressure gauge 10 is located between the stop valve 11 and the first manual ball valve 8.

[0036] In this embodiment, Figure 1 As shown, the flange plate 2 is locked on the end face of the flow channel 1.1 of the fixed ball valve 1 by the locking member 12. The flange plate 2 is locked on the end face of the flow channel 1.1 of the fixed ball valve 1 by the locking member 12. The flange plate 2 and the flow channel 1.1 are sealed. A sealing component 13 is provided between the flange plate 2 and the end face of the flow channel 1.1 of the fixed ball valve 1. The sealing component 13 improves the sealing performance between the flow channel 1.1 and the flange plate 2 to prevent leakage between the flow channel 1.1 and the outside during detection. Further, as Figure 1 As shown, the sealing assembly 13 is an O-type sealing ring, and the number of the O-type sealing rings is multiple. The multiple O-type sealing rings are coaxially arranged to improve the sealing performance between the flow channel 1.1 and the flange plate 2, and prevent leakage between the flow channel 1.1 and the outside during detection.

[0037] Further, such as Figure 1 As shown, the base foot 14 is also included, and the base foot 14 is locked to the lower end of the fixed ball valve 1 through the locking member 12. The base foot 14 is locked to the lower end of the fixed ball valve 1 through the locking member 12 and the flange plate 2 at the same time, playing the role of supporting the fixed ball valve 1, and facilitating the second connecting pipe 5 to connect the bottom cover 3.

[0038] The utility model has the following beneficial effects: the sealing performance of the fixed ball valve 1 can be detected with maximum accuracy, and the production qualification rate of the fixed ball valve 1 can be improved. Moreover, the detection device has a simple structure, convenient installation and disassembly, intuitive detection results, and low detection cost.

[0039] Operation process:

[0040] The flange plate 2, the first pressure test tube 4.1, and the first manual ball valve 8 are welded together;

[0041] A second test hole 3.1 is drilled on the bottom cover 3, and after being assembled with the valve body, the valve middle cavity 1.2 is connected with the external connection, and then the bottom cover 3, the second pressure test tube 5.1, and the second manual ball valve 9 are welded together to form a middle cavity 1.2 test assembly, and the middle cavity 1.2 test assembly is connected to the valve body;

[0042] Two O-rings are installed on the two flange plates 2. Double O-rings are used for sealing to ensure the tightness between the flange plate 2 and the valve during the pressure test. Then the flange plate 2 and the valve are assembled together by fasteners.

[0043] Connect the gas cylinder 6 with the stop valve 11, the pressure gauge 10 and the pressure regulating valve to the first manual ball valve 8 through the gas pipe;

[0044] One side of the second air pipe 5.2 of standard size is installed together with the second manual ball valve 9, and the other side is extended into the alcohol bottle filled with alcohol according to the standard depth;

[0045] After the above work is ready, first open the first manual ball valve 8 and the second manual ball valve 9, and then open the gas cylinder 6. After opening, the gas in the gas cylinder 6 will enter the valve through the flange plate 2. According to the standard, the outlet pressure of the gas cylinder 6 is stabilized at the standard specified value;

[0046] After the pressure is stable, check whether the valve seat is leaking by observing whether there are bubbles in the alcohol bottle. If there are bubbles in the alcohol bottle, it means there is a leak between the flow channel 1.1 on this side and the middle cavity 1.2.

[0047] After the valve seat leakage test on this side is completed, close the stop valve 11 on the gas cylinder 6, and open and close the valve several times to allow the gas just filled into the valve to be discharged through the first pressure test pipe 4.1 to ensure safety during disassembly;

[0048] After the above steps are completed, remove flange plate 2, replace the pressure side, and repeat steps 3 to 8. After both sides are tested, a test record report is generated.

[0049] The basic structure is based on the first embodiment. The second embodiment optimizes the flange plate 2. Figure 2 A sealing performance detection device for a fixed ball valve 1 is shown, comprising two flange plates 2 sealingly matched with the flow channel 1.1 of the fixed ball valve 1 and a bottom cover 3 arranged at the bottom end of the fixed ball valve 1, the two flange plates 2 are provided with first test holes 2.1 connected to the corresponding flow channels 1.1 of the flange plates 2, one of the first test holes 2.1 is connected to the gas cylinder 6 through the first connecting pipe 4, and a sealing plug 15 is arranged in the other first test hole 2.1, and a second test hole 3.1 connected to the middle cavity 1.2 of the fixed ball valve 1 is provided on the bottom cover 3, and the second test hole 3.1 is connected to the bubble detection bottle 7 through the second connecting pipe 5.

[0050] The outer end of the first detection hole of the flange plate 2 is provided with a mounting portion, and the first connecting pipe 4 is screwed on the mounting portion. When it is necessary to detect the flow channel 1.1 on different sides, there is no need to disassemble the flange plate 2. The first connecting pipe 4 can be disassembled and replaced for detection on different sides.

[0051] The bubble detection bottle 7 is an alcohol bottle filled with alcohol, and one end of the first connecting tube 4 extends into the alcohol in the alcohol bottle.

[0052] In this embodiment, Figure 1 As shown, the first connecting pipe 4 is provided with a first manual ball valve 8 for opening and closing the first connecting pipe 4, and the second connecting pipe 5 is provided with a second manual ball valve 9 for opening and closing the second connecting pipe 5. The first manual ball valve 8 realizes the opening and closing of the first connecting pipe 4, and the second manual ball valve 9 realizes the opening and closing of the second connecting pipe 5. Before the sealing performance test, the first manual ball valve 8 and the second manual ball valve 9 are both closed. After the detection device and the fixed ball valve 1 are installed, the first manual ball valve 8 and the second manual ball valve 9 are opened.

[0053] Specifically, Figure 1 As shown, the first connecting pipe 4 includes a first pressure test pipe 4.1 and a first air pipe 4.2. One end of the first pressure test pipe 4.1 is connected to the first test hole 2.1 on the flange plate 2, and the other end is connected to the first manual ball valve 8; one end of the first air pipe 4.2 is connected to the first manual ball valve 8, and the other end is connected to the gas cylinder 6. There are many ways to connect the first pressure test pipe 4.1, the flange plate 2, and the first manual ball valve 8. One implementation method is that one end of the first pressure test pipe 4.1 is welded to the flange plate 2, and the other end is welded to the first manual ball valve 8. Figure 1As shown, the second connecting pipe 5 includes a second pressure test pipe 5.1 and a second air pipe 5.2. One end of the second pressure test pipe 5.1 is connected to the second test hole 3.1 on the bottom cover 3, and the other end is connected to the second manual ball valve 9; one end of the second air pipe 5.2 is connected to the second manual ball valve 9, and the other end is connected to the bubble detection bottle 7. There are many ways to connect the second pressure test pipe 5.1, the flange plate 2, and the second manual ball valve 9. One implementation is that one end of the second pressure test pipe 5.1 is welded to the flange plate 2, and the other end is welded to the second manual ball valve 9.

[0054] Further, such as Figure 1 As shown, it also includes a pressure gauge 10, which is connected to the first gas pipe 4.2 and is used to detect the pressure value of the gas cylinder 6.

[0055] Further, such as Figure 1 As shown, a stop valve 11 is provided on the first connecting pipe 4, and the stop valve 11 is located at one end of the first connecting pipe 4 close to the gas cylinder 6. The stop valve 11 is used to ensure that the gas cylinder 6 is completely closed to prevent leakage of the gas cylinder 6; on the other hand, it is used to adjust the pressure value of the gas cylinder 6 on the flow channel 1.1 to adjust the flow rate. Implementation method 1: A stop valve 11 is provided on the first gas pipe 4.2, and the stop valve 11 is located at one end of the first gas pipe 4.2 close to the gas cylinder 6, and the pressure gauge 10 is located between the stop valve 11 and the first manual ball valve 8.

[0056] In this embodiment, Figure 1 As shown, the flange plate 2 is locked on the end face of the flow channel 1.1 of the fixed ball valve 1 by the locking member 12. The flange plate 2 is locked on the end face of the flow channel 1.1 of the fixed ball valve 1 by the locking member 12. The flange plate 2 and the flow channel 1.1 are sealed. A sealing component 13 is provided between the flange plate 2 and the end face of the flow channel 1.1 of the fixed ball valve 1. The sealing component 13 improves the sealing performance between the flow channel 1.1 and the flange plate 2 to prevent leakage between the flow channel 1.1 and the outside during detection. Further, as Figure 1 As shown, the sealing assembly 13 is an O-type sealing ring, and the number of the O-type sealing rings is multiple. The multiple O-type sealing rings are coaxially arranged to improve the sealing performance between the flow channel 1.1 and the flange plate 2, and prevent leakage between the flow channel 1.1 and the outside during detection.

[0057] Further, such as Figure 1 As shown, the base foot 14 is also included, and the base foot 14 is locked to the lower end of the fixed ball valve 1 through the locking member 12. The base foot 14 is locked to the lower end of the fixed ball valve 1 through the locking member 12 and the flange plate 2 at the same time, playing the role of supporting the fixed ball valve 1, and facilitating the second connecting pipe 5 to connect the bottom cover 3.

[0058] The utility model has the following beneficial effects: the sealing performance of the fixed ball valve 1 can be detected with maximum accuracy, and the production qualification rate of the fixed ball valve 1 can be improved. Moreover, the detection device has a simple structure, convenient installation and disassembly, intuitive detection results, and low detection cost.

[0059] The specific embodiments described above are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made in accordance with the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting sealing performance of a fixed ball valve, characterized in that: It includes two flange plates that are sealed with the flow channel of the fixed ball valve and a bottom cover arranged at the bottom end of the fixed ball valve. At least one flange plate is provided with a first test hole connected to the corresponding flow channel of the flange plate, and the first test hole is connected to the gas cylinder through a first connecting pipe. The bottom cover is provided with a second test hole connected to the middle cavity of the fixed ball valve, and the second test hole is connected to the bubble detection bottle through a second connecting pipe.

2. A trunnion ball valve sealing performance detection device according to claim 1, characterized in that: The first connecting pipe is provided with a first manual ball valve for opening and closing the first connecting pipe, and the second connecting pipe is provided with a second manual ball valve for opening and closing the second connecting pipe.

3. A trunnion ball valve sealing performance detection device according to claim 2, characterized in that: The first connecting pipe includes a first pressure test pipe and a first air pipe, one end of the first pressure test pipe is connected to the first test hole on the flange plate, and the other end is connected to the first manual ball valve; one end of the first air pipe is connected to the first manual ball valve, and the other end is connected to the gas cylinder.

4. A sealing performance detection device for a trunnion-mounted ball valve according to claim 3, characterized in that: The second connecting pipe includes a second pressure test tube and a second air pipe, one end of the second pressure test tube is connected to the second test hole on the bottom cover, and the other end is connected to the second manual ball valve; one end of the second air pipe is connected to the second manual ball valve, and the other end is connected to the bubble detection bottle.

5. A sealing performance detection device for a trunnion-mounted ball valve according to claim 4, characterized in that: It also includes a pressure gauge, which is connected to the first air pipe.

6. A sealing performance detection device for a trunnion-mounted ball valve according to claim 1, 2 or 3, characterized in that: The first connecting pipe is provided with a stop valve, and the stop valve is located at one end of the first connecting pipe close to the gas cylinder.

7. A sealing performance detection device for a trunnion-mounted ball valve according to claim 1, 2 or 3, characterized in that: The flange plate is locked on the flow channel end surface of the fixed ball valve through a locking piece.

8. A sealing performance testing device for a trunnion-mounted ball valve according to claim 7, characterized in that: A sealing component is arranged between the flange plate and the flow channel end surface of the fixed ball valve.

9. A sealing performance testing device for a trunnion-mounted ball valve according to claim 8, characterized in that: The sealing component is an O-type sealing ring, and the number of the O-type sealing ring is multiple.

10. The sealing performance detection device of a trunnion-mounted ball valve according to claim 7, characterized in that: It also includes a base support foot, and the base support foot is locked on the lower end of the fixed ball valve through a locking piece.

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