Air tightness testing device for low-pressure pipeline

Abstract

The utility model provides a low-pressure pipeline air tightness testing device, and relates to the technical field of pipeline air tightness testing, the low-pressure pipeline air tightness testing device comprises a pressurizing device, a pressure measuring device, a first three-way pipe fitting, a first hose, a second hose and a connecting assembly, the connecting assembly is connected with a tested vertical pipe, a cut-off valve and other low-pressure pipelines, and the pipelines are pressurized through the pressurizing device; meanwhile, the pressure measuring device monitors and displays the air pressure value in real time, so that the sealing performance of low-pressure pipelines such as a vertical pipe and a stop valve is tested under the standard air pressure, whether braking of the stop valve or a blow-off valve fails or not is judged, and the method also avoids the unsanitary and unsafe bad habit of measuring the pressure by blowing air with a mouth. Low-pressure pipelines such as a vertical pipe and a stop valve can be quickly and stably connected, and sealing performance testing is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline air tightness testing, and in particular to a low-pressure pipeline air tightness testing device. Background Art

[0002] In daily work, after the riser pressure maintaining or the shut-off valve of the pressure regulator is repaired and maintained, the staff usually use their mouths to blow air directly into the riser pressure maintaining plate hose and the shut-off valve pressure test point to test whether it is airtight. The pressure of this artificial blowing is affected by many factors, first of all, the size of a person's lung capacity and physical condition, and secondly, it is affected by the environmental air pressure of the four seasons in spring, summer, autumn and winter and the height of the floor. This test pressure only gives the tester a rough estimate of the pressure, but cannot get an ideal standard correct pressure value.

[0003] In order to solve the problem that the existing low-pressure pipeline air tightness test method is not convenient to use and cannot accurately control the test air pressure, the utility model is specially proposed. Utility Model Content

[0004] The embodiment of the present application provides a low-pressure pipeline air tightness testing device, the test air pressure value is controllable and visible, and it is easy to use, which solves the problem that the existing low-pressure pipeline air tightness testing method is not easy to use and cannot accurately control the test air pressure.

[0005] The embodiment of the present application provides a low-pressure pipeline air tightness testing device, including a pressurizing device, a pressure measuring device, a first three-way pipe fitting, a first hose, a second hose, and a connecting assembly;

[0006] The first end of the first three-way pipe is connected to the pressure measuring device, the second end of the first three-way pipe is connected to the pressurizing device through the first hose, the third end of the first three-way pipe is connected to the connecting assembly through the second hose, and the connecting assembly is connected to the low-pressure pipeline;

[0007] Wherein, the connection assembly includes a second three-way pipe fitting, a third hose, a sleeve, an annular airbag and a fourth hose;

[0008] The two axial ends of the sleeve are respectively an open end and a sealed end, the annular airbag is arranged on the inner wall of the circumference of the sleeve, the first end of the second three-way pipe is connected to the second hose, the second end of the second three-way pipe is connected to the first end of the third hose, the second end of the third hose passes through the sealed end of the sleeve and is connected to the inner cavity of the sleeve, the third end of the second three-way pipe is connected to the first end of the fourth hose, the second end of the fourth hose passes through the side of the sleeve and is connected to the annular airbag;

[0009] The low-pressure pipeline is plugged into the inner cavity of the sleeve, and the annular airbag is sleeved on the outer wall of the low-pressure pipeline.

[0010] In a feasible implementation, the third hose is provided with a first valve body, and the fourth hose is provided with a second valve body.

[0011] In a feasible implementation, the connection assembly further includes a limiting ring;

[0012] The limiting ring is arranged on the inner wall of the sleeve and is located at the open end of the sleeve. The inner diameter of the limiting ring is smaller than or equal to the inner diameter of the annular airbag in the contracted state, and the inner diameter of the limiting ring is larger than the inner diameter of the annular airbag in the expanded state.

[0013] The end of the limiting ring away from the annular airbag is provided with a tapered groove.

[0014] In a feasible implementation, the outer wall of the annular airbag is provided with anti-slip grooves, and the anti-slip grooves are evenly distributed around the outer wall of the circumference of the annular airbag.

[0015] In a feasible implementation, the second end and the third end of the first three-way pipe fitting are respectively connected to the first hose and the second hose through a quick connector, and the quick connector includes a special-shaped pipe and a connecting pipe;

[0016] The outer wall of the first end of the special-shaped tube is threadedly connected to the inner wall of the second end or the inner wall of the third end of the first three-way pipe fitting, the inner wall of the second end of the special-shaped tube is rotatably connected to the outer wall of the first end of the connecting tube, and the second end of the connecting tube is connected to the first hose or the second hose.

[0017] In a feasible implementation, the special-shaped tube is a reducer tube, and the reducer tube includes a thin tube portion and a thick tube portion, and the thin tube portion is fixedly connected to the thick tube portion;

[0018] The thin tube portion is threadedly connected to the first three-way pipe fitting, the thick tube portion is rotatably connected to the connecting pipe, and the outer diameter of the thick tube portion is equal to the outer diameter of the first three-way pipe fitting.

[0019] In a feasible implementation, the pressure measuring device is a pressure gauge, the pressure gauge has an air inlet pipe, and the first end of the first three-way pipe is connected to the air inlet pipe of the pressure gauge.

[0020] In a feasible implementation, the inner wall of the first end of the first three-way pipe is provided with an internal thread, the outer wall of the pressure gauge air inlet pipe is provided with an external thread, and the first end of the first three-way pipe is threadedly connected to the air inlet pipe of the pressure gauge.

[0021] In a feasible implementation manner, a wire clamp is provided on an outer wall of the pressure gauge, and the wire clamp clamps the first hose and / or the second hose.

[0022] In a feasible implementation, the pressurizing device is a pressurizing ball.

[0023] The embodiment of the present application provides a low-pressure pipeline air tightness test device, wherein the first end of the first three-way pipe fitting is connected to the pressure measuring device, the second end of the first three-way pipe fitting is connected to the pressurizing device through the first hose, and the third end of the first three-way pipe fitting is connected to the connecting assembly through the second hose. When in use, the connecting assembly is connected to the low-pressure pipeline such as the standpipe and the cut-off valve to be tested, and the pipeline is pressurized by the pressurizing device. At the same time, the pressure measuring device monitors and displays the air pressure value in real time, so as to test the sealing of the low-pressure pipeline such as the standpipe and the cut-off valve under standard air pressure, and judge whether the brake of the cut-off valve or the relief valve fails. This method also avoids the unhealthy and unsafe bad habit of blowing air to measure the pressure with the mouth;

[0024] The connecting assembly includes a sleeve, an annular airbag is provided on the inner wall of the circumference of the sleeve, a first end of a second three-way pipe fitting is connected to the second hose, a second end of the second three-way pipe fitting is connected to the inner cavity of the sleeve through a third hose, and a third end of the second three-way pipe fitting is connected to the annular airbag through a fourth hose. When in use, low-pressure pipelines such as risers and cut-off valves are plugged into the inner cavity of the sleeve, and the annular airbag is sleeved on the outer wall of the low-pressure pipeline. The annular airbag can be inflated first to expand the annular airbag and tightly wrap the outer wall of the low-pressure pipeline, so that the low-pressure pipeline and the sleeve are quickly and stably connected, and then the inner cavity of the sleeve is inflated to test the sealing of low-pressure pipelines such as risers and cut-off valves. The present application can quickly and stably connect low-pressure pipelines such as risers and cut-off valves through structural designs such as sleeves and annular airbags, which is convenient for sealing testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a low-pressure pipeline air tightness testing device provided by the present application;

[0026] Figure 2 is a schematic diagram of the connected components and their connection structure;

[0027] Figure 3 It is a schematic diagram of a quick connector and its connection structure.

[0028] Description of reference numerals:

[0029] 10-pressurizing device; 20-pressure measuring device; 30-first three-way pipe fitting; 40-first hose; 50-second hose; 60-connecting assembly; 70-quick connector;

[0030] 61 - second three-way pipe fitting; 62 - third hose; 63 - sleeve; 64 - annular airbag; 65 - fourth hose; 66 - first valve body; 67 - second valve body; 68 - limiting ring; 71 - special-shaped pipe; 72 - connecting pipe. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0032] The shut-off valve of the riser pressure maintaining or pressure regulator needs to be tested for air tightness after maintenance. The staff usually use their mouths to blow air directly into the riser pressure maintaining plate hose and the shut-off valve pressure test point to test whether it is airtight. The pressure of this artificial blowing is affected by many factors. First of all, the size of a person's lung capacity and physical condition, and secondly, it is affected by the environmental air pressure of the four seasons in spring, summer, autumn and winter and the height of the floor. This test pressure only gives the tester a rough estimate of the pressure, but cannot get an ideal standard correct pressure value.

[0033] The low-pressure pipeline air tightness testing device provided in the present application can adjust the low pressure to be tested from an approximate value to a controllable and visible value, and can test the sealing of low-pressure pipelines such as risers and cut-off valves under standard air pressure to determine whether the cut-off valve or relief valve has brake failure. This method also avoids the unhygienic and unsafe habit of measuring pressure by blowing air with the mouth.

[0034] The specific structure of the low-pressure pipeline air tightness testing device provided in the present application is described in detail below in conjunction with the accompanying drawings.

[0035] Reference Figure 1-Figure 3 As shown, the embodiment of the present application provides a low-pressure pipeline air tightness test device, including a pressurizing device 10, a pressure measuring device 20, a first three-way pipe fitting 30, a first hose 40, a second hose 50 and a connecting assembly 60, the first three-way pipe fitting 30 can be a conventional stainless steel three-way pipe fitting, and the first hose 40 and the second hose 50 can both be rubber hoses;

[0036] like Figure 1 As shown, the bottom end of the first three-way pipe fitting 30 is connected to the air inlet of the pressure measuring device 20, the right end of the first three-way pipe fitting 30 is connected to the pressurizing device 10 through the first hose 40, and the left end of the first three-way pipe fitting 30 is connected to the connecting assembly 60 through the second hose 50, and the connecting assembly 60 is connected to the low-pressure pipeline;

[0037] The low-pressure pipeline is connected through the connecting assembly 60, so that the low-pressure pipeline, the second hose 50, the first three-way pipe fitting 30, the pressure measuring device 20, the first hose 40 and the pressurizing device 10 form a connected air circuit, and air is injected into the air circuit through the pressurizing device 10, and the air pressure is monitored in real time through the pressure measuring device 20, so as to detect the air tightness of the low-pressure pipeline.

[0038] like Figure 2 As shown, the connection assembly 60 includes a second three-way pipe fitting 61, a third hose 62, a sleeve 63, an annular airbag 64 and a fourth hose 65. The second three-way pipe fitting 61 can be a stainless steel three-way pipe fitting, the third hose 62 and the fourth hose 65 can both be rubber hoses, the sleeve 63 can be a metal cylinder, and the annular airbag 64 can be an annular rubber airbag;

[0039] The two axial ends of the sleeve 63 are respectively an open end and a sealed end, that is, the left end of the sleeve 63 is an open end and the right end is a sealed end. The annular airbag 64 is arranged on the inner wall of the circumference of the sleeve 63. The low-pressure pipeline is inserted into the inner cavity of the sleeve 63 from the left end of the sleeve 63. The annular airbag 64 sleeves the low-pressure pipeline. The right end of the second three-way pipe fitting 61 is connected to the second hose 50. The left end of the second three-way pipe fitting 61 is connected to the right end of the third hose 62. The left end of the third hose 62 passes through the sealed end of the sleeve 63 and is connected to the inner cavity of the sleeve 63. The upper end of the second three-way pipe fitting 61 is connected to the right end of the fourth hose 65. The left end of the fourth hose 65 passes through the side of the sleeve 63 and is connected to the annular airbag 64.

[0040] The pressurizing device 10, the first hose 40, the first three-way pipe fitting 30, the second hose 50, the second three-way pipe fitting 61, the fourth hose 65 and the annular airbag 64 are sequentially connected, and the low-pressure pipeline is inserted into the inner cavity of the sleeve 63. The pressurizing device 10 injects air into the annular airbag 64, so that the annular airbag 64 collides with the inner side of the sleeve 63, so that the annular airbag 64 tightly wraps the side wall of the low-pressure pipeline, thereby preventing the low-pressure pipeline from escaping from the sleeve 63;

[0041] The inner cavities of the pressurizing device 10, the first hose 40, the first three-way pipe fitting 30, the second hose 50, the second three-way pipe fitting 61, the third hose 62 and the sleeve 63 are connected in sequence. Gas is injected into the sleeve 63 through the pressurizing device 10, and then into the low-pressure pipeline. The air pressure change is monitored in real time through the pressure measuring device 20, so as to detect the air tightness of the low-pressure pipeline.

[0042] In some embodiments, the third hose 62 is provided with a first valve body 66, and the fourth hose 65 is provided with a second valve body 67, and both the first valve body 66 and the second valve body 67 can be manual gas valves;

[0043] When in use, the first valve body 66 can be closed first, and the second valve body 67 can be opened, and air can only be injected into the annular airbag 64. The air pressure value can be detected and displayed in real time through the pressure measuring device 20 until the specified air pressure is reached, so that the low-pressure pipeline can be stably fixed in the sleeve 63; then, the second valve body 67 is closed to keep the annular airbag 64 in an expanded state, and the first valve body 66 is opened to inject air into the low-pressure pipeline to test the air tightness of the low-pressure pipeline.

[0044] In some embodiments, the connection assembly 60 further includes a stop ring 68, which is disposed on the inner wall of the sleeve 63 and located at the open end of the sleeve 63. The stop ring 68 may be a circular metal ring and may be an integral structure with the sleeve 63.

[0045] The inner diameter of the limiting ring 68 is smaller than or equal to the inner diameter of the annular airbag 64 in the contracted state, and is larger than the outer diameter of the conventional low-pressure pipeline. In the natural state, the annular airbag 64 is in the contracted state, and the annular airbag 64 fits the inner wall of the sleeve 63 under the action of its own elasticity. Therefore, when the low-pressure pipeline is inserted into the inner cavity of the sleeve 63, the low-pressure pipeline will not contact the annular airbag 64 under the limiting action of the limiting ring 68;

[0046] The inner diameter of the limiting ring 68 is larger than the inner diameter of the annular airbag 64 when it is inflated. When the annular airbag 64 is inflated, the annular airbag 64 is tightly sleeved against the outer wall of the low-pressure pipeline.

[0047] Reference Figure 2 As shown, a conical groove is provided at the end of the limiting ring 68 away from the annular airbag 64 , and the left end of the conical groove is a conical end, so as to facilitate the insertion of the low-pressure pipeline into the sleeve 63 .

[0048] In some embodiments, the outer wall of the annular airbag 64 is provided with anti-skid patterns, which are evenly distributed around the outer wall of the circumference of the annular airbag 64 and are located on the left side of the annular airbag 64, thereby improving the stability of the low-pressure pipeline fixation.

[0049] Reference Figure 1 and Figure 3 As shown, in some embodiments, the second end and the third end of the first three-way pipe fitting 30 are respectively connected to the first hose 40 and the second hose 50 through a quick connector 70, and the quick connector 70 includes a special-shaped pipe 71 and a connecting pipe 72;

[0050] The outer wall of the first end of the special-shaped tube 71 is threadedly connected to the inner wall of the second end or the inner wall of the third end of the first three-way pipe 30, the inner wall of the second end of the special-shaped tube 71 is rotatably connected to the outer wall of the first end of the connecting tube 72, and the second end of the connecting tube 72 is connected to the first hose 40 or the second hose 50;

[0051] like Figure 3As shown, taking the left quick connector 70 as an example, the right outer wall of the special-shaped tube 71 is screwed with the inner wall of the first three-way pipe fitting 30, the left inner wall of the special-shaped tube 71 is rotatably connected with the outer wall of the connecting tube 72, and the connecting tube 72 is connected with the second hose 50; when connecting the second hose 50 and the first three-way pipe fitting 30, the second hose 50 and the first three-way pipe fitting 30 can be fixed, and the special-shaped tube 71 is rotated clockwise to screw the special-shaped tube 71 with the first three-way pipe fitting 30, so that the second hose 50 and the first three-way pipe fitting 30 can be connected; conversely, when the second hose 50 and the first three-way pipe fitting 30 are separated, the second hose 50 and the first three-way pipe fitting 30 can be fixed, and the special-shaped tube 71 is rotated counterclockwise to separate the rotating special-shaped tube 71 from the first three-way pipe fitting 30, so that the second hose 50 and the first three-way pipe fitting 30 can be separated.

[0052] In some embodiments, the special-shaped tube 71 is a reducer tube, which includes a thin tube portion and a thick tube portion, the thin tube portion is fixedly connected to the thick tube portion, and the thin tube portion and the thick tube portion can be an integrated structure;

[0053] The outer wall of the thin tube portion is provided with an external thread, which is threadedly connected to the first three-way pipe fitting 30 , and the thick tube portion is rotatably connected to the connecting pipe 72 , and the outer diameter of the thick tube portion is equal to the outer diameter of the first three-way pipe fitting 30 .

[0054] In some embodiments, the pressure measuring device 20 is a pressure gauge, which may be a U-type pressure gauge or a 16 kPa pressure gauge. The pressure gauge has an air inlet pipe, and the first end of the first three-way pipe fitting 30 is connected to the air inlet pipe of the pressure gauge.

[0055] In some embodiments, the inner wall of the first end of the first three-way pipe fitting 30 is provided with an internal thread, the outer wall of the pressure gauge air inlet pipe is provided with an external thread, and the first end of the first three-way pipe fitting 30 is threadedly connected to the air inlet pipe of the pressure gauge.

[0056] In some embodiments, a wire clamp is disposed on the outer wall of the pressure gauge, and the wire clamp clamps the first hose 40 and / or the second hose 50, thereby facilitating the fixing of the hoses.

[0057] Reference Figure 1 As shown, in some embodiments, the pressurizing device 10 is a pressurizing ball.

[0058] According to the above technical features, the working principle of the low-pressure pipeline air tightness test device provided by the present application in the actual application scenario is:

[0059] Before use, assemble the low-pressure pipeline air tightness test device, connect the first three-way pipe fitting 30 with the pressure measuring device 20, connect the first three-way pipe fitting 30, the first hose 40 and the pressurizing device 10, connect the first three-way pipe fitting 30, the second hose 50 and the second three-way pipe fitting 61, connect the second three-way pipe fitting 61, the third hose 62 and the sleeve 63, and connect the second three-way pipe fitting 61, the fourth hose 65 and the annular airbag 64;

[0060] When in use, the low-pressure pipeline is inserted into the inner cavity of the sleeve 63, the first valve body 66 is closed, the second valve body 67 is opened, and air is injected into the annular airbag 64 through the pressurizing device 10, so that the annular airbag 64 collides against the inner side of the sleeve 63, so that the annular airbag 64 tightly wraps the side wall of the low-pressure pipeline, thereby preventing the low-pressure pipeline from detaching from the sleeve 63; then, the second valve body 67 is closed to keep the annular airbag 64 in an expanded state, the first valve body 66 is opened, and air is injected into the sleeve 63 through the pressurizing device 10, and then into the low-pressure pipeline, and the air pressure changes are monitored in real time through the pressure measuring device 20, thereby detecting the air tightness of the low-pressure pipeline.

[0061] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0062] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A low-pressure pipeline air tightness testing device, characterized in that: It comprises a pressurizing device (10), a pressure measuring device (20), a first three-way pipe fitting (30), a first hose (40), a second hose (50) and a connecting assembly (60); The first end of the first three-way pipe fitting (30) is connected to the pressure measuring device (20), the second end of the first three-way pipe fitting (30) is connected to the pressurizing device (10) via the first hose (40), the third end of the first three-way pipe fitting (30) is connected to the connecting assembly (60) via the second hose (50), and the connecting assembly (60) is connected to the low-pressure pipeline; Wherein, the connecting assembly (60) comprises a second three-way pipe (61), a third hose (62), a sleeve (63), an annular airbag (64) and a fourth hose (65); The two axial ends of the sleeve (63) are respectively an open end and a sealed end; the annular airbag (64) is arranged on the inner wall of the circumferential surface of the sleeve (63); the first end of the second three-way pipe fitting (61) is connected to the second hose (50); the second end of the second three-way pipe fitting (61) is connected to the first end of the third hose (62); the second end of the third hose (62) passes through the sealed end of the sleeve (63) and is connected to the inner cavity of the sleeve (63); the third end of the second three-way pipe fitting (61) is connected to the first end of the fourth hose (65); the second end of the fourth hose (65) passes through the side of the sleeve (63) and is connected to the annular airbag (64); The low-pressure pipeline is inserted into the inner cavity of the sleeve (63), and the annular air bag (64) is sleeved on the outer wall of the low-pressure pipeline.

2. The low-pressure pipeline air tightness testing device according to claim 1 is characterized in that: The third hose (62) is provided with a first valve body (66), and the fourth hose (65) is provided with a second valve body (67).

3. The low-pressure pipeline air tightness testing device according to claim 1, characterized in that: The connecting assembly (60) further includes a limiting ring (68); The limiting ring (68) is arranged on the inner wall of the sleeve (63) and is located at the open end of the sleeve (63); the inner diameter of the limiting ring (68) is smaller than or equal to the inner diameter of the annular airbag (64) in a contracted state, and the inner diameter of the limiting ring (68) is larger than the inner diameter of the annular airbag (64) in an expanded state; The end of the limiting ring (68) away from the annular airbag (64) is provided with a tapered groove.

4. The low-pressure pipeline air tightness testing device according to claim 1 or 3, characterized in that: The outer wall of the annular airbag (64) is provided with anti-skid patterns, and the anti-skid patterns are evenly distributed around the outer wall of the circumference of the annular airbag (64).

5. The low-pressure pipeline air tightness testing device according to claim 1, characterized in that: The second end and the third end of the first three-way pipe fitting (30) are respectively connected to the first hose (40) and the second hose (50) through a quick connector (70), and the quick connector (70) comprises a special-shaped pipe (71) and a connecting pipe (72); The outer wall of the first end of the special-shaped tube (71) is threadedly connected to the inner wall of the second end or the inner wall of the third end of the first three-way pipe fitting (30), the inner wall of the second end of the special-shaped tube (71) is rotatably connected to the outer wall of the first end of the connecting tube (72), and the second end of the connecting tube (72) is connected to the first hose (40) or the second hose (50).

6. The low-pressure pipeline air tightness testing device according to claim 5, characterized in that: The special-shaped tube (71) is a reducer tube, comprising a thin tube portion and a thick tube portion, wherein the thin tube portion is fixedly connected to the thick tube portion; The thin tube portion is threadedly connected to the first three-way pipe fitting (30), the thick tube portion is rotatably connected to the connecting pipe (72), and the outer diameter of the thick tube portion is equal to the outer diameter of the first three-way pipe fitting (30).

7. The low-pressure pipeline air tightness testing device according to claim 1, characterized in that: The pressure measuring device (20) is a pressure gauge having an air inlet pipe, and the first end of the first three-way pipe (30) is connected to the air inlet pipe of the pressure gauge.

8. The low-pressure pipeline air tightness testing device according to claim 7, characterized in that: The inner wall of the first end of the first three-way pipe fitting (30) is provided with an internal thread, the outer wall of the pressure gauge air inlet pipe is provided with an external thread, and the first end of the first three-way pipe fitting (30) is threadedly connected to the air inlet pipe of the pressure gauge.

9. The low-pressure pipeline air tightness testing device according to claim 7, characterized in that: The outer wall of the pressure gauge is provided with a wire clamp, and the wire clamp clamps the first hose (40) and / or the second hose (50).

10. The low-pressure pipeline air tightness testing device according to claim 1, characterized in that: The pressurizing device (10) is a pressurizing ball.

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