A ball valve air tightness testing machine

Abstract

The present invention discloses a ball valve air tightness test machine, including a frame, a turntable, a clamping tool and an air tightness test tool, the turntable is pivotally connected to the frame, the clamping tool and the air tightness test tool are distributed on the periphery of the turntable, the air tightness test tool includes a lifting mechanism, a linkage swing rod, a cam and a sealing cover, the sealing cover is used to seal the opening of one end of the ball valve, the cam is hinged on the periphery of the sealing cover, and the cam is against the outer side of the ball valve, there are several cams, which are evenly distributed around the periphery of the sealing cover, the number of the linkage swing rod is the same as that of the cam, one end of the linkage swing rod is hinged to the cam, and the other end of the linkage swing rod is hinged to the lifting end of the lifting mechanism; the clamping tool includes a bottom clamping mechanism and a top clamping mechanism, the bottom clamping mechanism is fixed to the turntable and rotates with the turntable and is used to clamp the flange of the ball valve, and the top clamping mechanism is used to clamp the outlet of the ball valve. The present invention can improve the accuracy of air tightness testing.

Description

Technical Field

[0001] The invention relates to a ball valve testing device, in particular to a ball valve air tightness testing machine. Background Art

[0002] A ball valve is a valve whose spherical opening and closing parts rotate around the axis of the ball valve under the drive of the valve stem. It has an inlet and an outlet, both of which are generally equipped with connecting threads and flanges for external fixed docking. In the quality inspection and testing of ball valves, airtightness test is an important part for testing its quality. In conventional ball valve airtightness testing, pressure cannot be directly applied to the ball valve body, because this will cause the ball valve body to deform, resulting in inaccurate test data. Especially for lightweight valve bodies made of plastic, deformation is more serious, making the test results even more unreliable.

[0003] Since the ball valve has an inlet and an outlet, both the inlet and the outlet need to be sealed. In conventional practice, the test of the ball valve is usually to screw a threaded cap at the inlet or outlet, and then pressurize the opposite side for testing. However, the operation method of screwing the threaded cap is inefficient, and the sealing effect is poor through the threaded sealing method, which can easily cause inaccurate test data. In addition, the ball valve needs to be tested for sealing in a limited and fixed state. The conventional ball valve clamping device uses a clamp or other manual pressurization method to clamp and fix the ball valve. However, the clamping components such as the pressure code that are manually tightened and adjusted by the bolts will not apply uniform pressure to the ball valve each time, making it difficult for operators to control the pressure. Excessive pressure will also cause the ball valve body to deform. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a ball valve air tightness tester that can improve the accuracy of air tightness testing.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A ball valve air tightness testing machine comprises a frame, a turntable, a clamping tool and an air tightness testing tool. The turntable is pivotally connected to the frame. The clamping tool and the air tightness testing tool are distributed around the turntable. The air tightness testing tool comprises a lifting mechanism, a linkage rocker arm, a cam and a sealing cover. The sealing cover is used to seal and cover an opening of one end of the ball valve. The cam is hinged on the peripheral side of the sealing cover, and the cam abuts against the outer side surface of the ball valve. There are several cams, which are evenly distributed around the outer periphery of the sealing cover. The number of the linkage rocker arm is the same as that of the cam. One end of the linkage rocker arm is hinged to the cam, and the other end of the linkage rocker arm is hinged to the lifting end of the lifting mechanism. The clamping tool comprises a bottom clamping mechanism and a top clamping mechanism. The bottom clamping mechanism is fixed to the turntable and rotates with the turntable and is used to clamp the flange of the ball valve. The top clamping mechanism is used to clamp the outlet of the ball valve.

[0007] Preferably, the ball valve air tightness testing machine also includes a rotating device for rotating the ball valve handle, the rotating device includes a telescopic cylinder, a rotating motor and a rotating shaft, the telescopic cylinder is fixed to the frame, the body of the rotating motor is fixed to the piston rod of the telescopic cylinder, the output shaft of the rotating motor is connected to one end of the rotating shaft, and the other end of the rotating shaft is used to insert the ball valve handle.

[0008] Preferably, a locking port is provided on the outer side of the sealing cover, and each locking port corresponds to the cam of the cam one by one; a hinge seat is provided on the outer edge of the locking port, one end of the linkage rocker arm is hinged to the tail end of the cam, and the head end of the cam is placed in the locking port and hinged to the hinge seat.

[0009] Preferably, a sealing plug is fixed in the sealing cover, and the sealing plug is sealed with the ball valve through a radial sealing member; the sealing plug extends from the sealing cover toward the opening direction of the sealing cover.

[0010] Preferably, the lifting mechanism is a first cylinder, the cylinder body of the first cylinder is fixed to the top of the sealing cover, and the piston rod of the first cylinder is hinged to the other end of the linkage rocker arm; the self-locking mechanism for the airtight test of the ball valve also includes a fixed frame, a fixed plate, a bracket and a second cylinder, the cylinder body of the second cylinder is fixed to the bracket, the piston rod of the second cylinder is fixed to the fixed plate, and the sealing cover fixing frame is flexibly connected.

[0011] Preferably, the bottom clamping mechanism includes a bottom plate, a first linear power mechanism, a second linear power mechanism, a first clamping mechanism, a second clamping mechanism and at least two bases arranged at intervals, the base is fixed to the bottom plate, the base is used to limit an opening at one end of the ball valve, and the first linear power mechanism is arranged between two adjacent bases; the first clamping mechanism is arranged on the inner sides of the two bases, and includes a connecting rod and a pressure rod, one end of the connecting rod is hinged to one end of the pressure rod, the other end of the connecting rod is hinged to the output end of the first linear power mechanism, the middle part of the pressure rod is hinged to the bottom plate, and the other end of the pressure rod is used to clamp the inner flange of the ball valve, the second linear power mechanism is arranged on the outer sides of the two bases, the second linear power mechanism is connected to the second clamping mechanism through transmission, and the second clamping mechanism is used to clamp the outer flange of the ball valve.

[0012] Preferably, a support is fixed on the bottom plate, the middle portion of the pressure rod is hinged to the support, and when the first linear power mechanism contracts, the linkage rod and the pressure rod contract in the support.

[0013] Preferably, the second clamping mechanism includes a transmission rod and a pressure plate, one end of the pressure plate is hinged to the base plate, and the other end of the pressure plate has at least two pressure heads for clamping the outer flange of the ball valve, the output end of the second linear power mechanism is hinged to one end of the transmission rod, and the other end of the transmission rod is hinged to the middle of the pressure plate.

[0014] Preferably, the ball valve air tightness testing machine further comprises a buffer pad, on which a plug post protrudes, and the buffer pad is respectively plugged into the pressure head and the other end of the pressure rod through the plug post.

[0015] Preferably, the base has a stepped inner cavity, a joint is disposed on the stepped inner cavity, the top end of the joint is used for threaded connection with an opening at one end of the ball valve, and the bottom end of the joint is supported by the stepped inner cavity.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention can drive the ball valve to different workstations to seal the inlet and outlet of the ball valve through the rotation of the turntable, thereby achieving efficient and automatic good airtight test effect. In particular, through the jacking mechanism, the linkage rocker rod is driven to drive the cam to rotate, so as to form cam clamping spaces that are close to each other on the sealing cover, thereby quickly sealing the opening (outlet) at one end of the ball valve. Moreover, since the cams are evenly distributed on the outer periphery of the sealing cover, the ball valve is subjected to more balanced force, with less deformation, and less impact on the accuracy of the test data, thereby achieving accurate and rapid ball valve airtight test; furthermore, through the top clamping mechanism and the bottom clamping mechanism, the bottom flange of the ball valve can be effectively clamped to stabilize the limit ball valve, reduce the influence of external factors, and further improve the accuracy of the airtight test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the ball valve air tightness testing machine of the present invention;

[0019] Figure 2 It is a schematic diagram of the airtightness test tool of the present invention;

[0020] Figure 3 It is a cross-sectional view of the lifting mechanism, sealing cover, sealing plug, cam and ball valve of the present invention;

[0021] Figure 4 It is a cross-sectional view of the bottom clamping mechanism of the present invention (showing the clamping and opening states of the first clamping mechanism and the second clamping mechanism);

[0022] Figure 5 It is a structural schematic diagram of the bottom pressing mechanism of the present invention.

[0023] In the figure: 100, frame; 200, turntable; 300, clamping tool; 301, top clamping mechanism; 302, bottom clamping mechanism; 400, airtight test tool; 500, rotating device; 501, telescopic cylinder; 502, rotating motor; 503, rotating shaft; 600, ball valve; 601, handle; 41, lifting mechanism; 42, linkage swing rod; 43, cam; 44, sealing cover; 441, locking port; 442, hinged seat; 46, sealing plug; 47. Fixed frame; 48. Fixed plate; 49. Bracket; 410. Second cylinder; 31. Bottom plate; 32. First linear power mechanism; 321. Linking rod; 322. Press rod; 33. Second linear power mechanism; 331. Transmission rod; 332. Press plate; 3321. Press head; 34. First clamping mechanism; 35. Second clamping mechanism; 36. Base; 38. Support; 39. Buffer pad; 310. Insert column; 311. Stepped inner cavity; 312. Connector. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] like Figure 1-3 The ball valve air tightness tester shown in the figure comprises a frame 100, a turntable 200, a pressing tool 300 and an air tightness test tool 400, the turntable 200 is pivotally connected to the frame 100, the pressing tool 300 and the air tightness test tool 400 are distributed around the turntable 200, the air tightness test tool 400 comprises a lifting mechanism 41, a linkage swing rod 42, a cam 43 and a sealing cover 44, the sealing cover 44 is used to seal an opening (outlet) of a ball valve 600, the cam 43 is hinged to the side of the sealing cover 44, and the cam 43 is connected to the ball valve 600. 00, the outer side surfaces thereof are pressed against each other, there are a plurality of cams 43, which are evenly distributed around the outer circumference of the sealing cover, the number of the linkage rocker rods 42 is the same as the cams 43, one end of the linkage rocker rods 42 is hinged to the cams 43, and the other end of the linkage rocker rods 42 is hinged to the lifting end of the lifting mechanism 41; the clamping fixture 300 includes a bottom clamping mechanism 302 and a top clamping mechanism 301, the bottom clamping mechanism 302 is fixed to the turntable 200 and rotates with the turntable 200 and is used to clamp the flange of the ball valve 600, and the top clamping mechanism 301 is used to clamp the outlet of the ball valve 600.

[0026] The turntable 200 can be driven to rotate by a motor and corresponding transmission components. Through the rotation of the turntable 200, the ball valve 600 can be driven to different workstations to seal the inlet and outlet of the ball valve 600, thereby achieving efficient and automatic good airtight test results. In particular, through the lifting mechanism 41, the linkage rocker rod 42 is driven to drive the cam 43 to rotate, so as to form a clamping space of the cams 43 that are close to each other on the sealing cover 44, thereby quickly sealing the opening (outlet) at one end of the ball valve 600. Moreover, since the cams 43 are evenly distributed on the outer periphery of the sealing cover 44, the ball valve 600 is subjected to more balanced force, the deformation is smaller, and the accuracy of the test data is less affected, thereby achieving accurate and rapid airtight test of the ball valve 600; furthermore, through the top clamping mechanism 301 and the bottom clamping mechanism 302, the bottom flange of the ball valve 600 can be effectively clamped to stabilize the limit ball valve 600, reduce the influence of external factors, and further improve the accuracy of the airtight test. The sealing cover 44 can be made of a soft material such as silicone that does little damage to the ball valve 600. The lifting end of the lifting mechanism 41 can be extended and retracted to drive the cams 43 to move in the direction of clamping and dispersing. The top clamping mechanism 301 can use a pressure cover to pre-limit and clamp the outlet of the ball valve 600.

[0027] When in use, by rotating the turntable 200, the ball valve 600 is first positioned by the clamping fixture 300, and then rotated to the position of the airtight testing fixture 400, so that the outlet and inlet of the ball valve 600 are sealed by the sealing clamping fixture 300 and the airtight testing fixture 400. At this time, the rotating shaft 503 is rotated to rotate the handle 601 of the ball valve 600 to drive the valve core to rotate, so that the test gas is introduced from one end of the ball valve 600 (a test inlet can be opened separately), and then the other end of the ball valve 600 is tested for gas leakage to complete the airtight test.

[0028] like Figure 1 As shown, in order to form a more automated airtight test, the ball valve 600 airtightness tester also includes a rotating device 500 for rotating the handle 601 of the ball valve 600, and the rotating device 500 includes a telescopic cylinder 501, a rotating motor 502 and a rotating shaft 503. The telescopic cylinder 501 is fixed to the frame 100, and the body of the rotating motor 502 is fixed to the piston rod of the telescopic cylinder 501. The output shaft of the rotating motor 502 is connected to one end of the rotating shaft 503, and the other end of the rotating shaft 503 is used to insert the handle 601 of the ball valve 600. The rotating shaft 503 can be inserted into the mounting recess of the handle 601 of the ball valve 600, and the mounting recess and the rotating shaft 503 can be engaged to realize the linkage rotation drive.

[0029] like Figure 2-3As shown, in order to make the cam 43 better and more evenly exert the force on the ball valve 600, the outer side of the sealing cover 44 is provided with a locking hole 441, and each locking hole 441 corresponds to the position of the cam 43 of the cam 43. In order to better install and fix the cam 43, the outer edge of the locking hole 441 is provided with a hinge seat 442, one end of the linkage swing rod 42 is hinged to the tail end of the cam 43, and the head end of the cam 43 is placed in the locking hole 441 and hinged to the hinge seat 442.

[0030] In the sealing cover 44 of the present embodiment, a sealing plug 46 is fixed inside, and the sealing plug 46 is sealed with the ball valve 600 through a radial seal; the sealing plug 46 extends from the inside of the sealing cover 44 toward the opening direction of the sealing cover 44. The threaded connection between the sealing plug 46 and the opening (outlet) at one end of the ball valve 600 realizes a single sealing effect of the ball valve 600, and the sealing effect is better when combined with the cover of the sealing cover 44. The sealing plug 46 is made of silicone and can be directly inserted into the opening (outlet) at one end of the ball valve 600 without rotation, which is conducive to faster installation; of course, it can also be configured in a manner that requires rotation and tightening. More importantly, the sealing plug 46 that can be inserted into the opening (outlet) at one end of the ball valve 600 can fill the volume inside the ball valve 600, which relatively reduces the gas that needs to be introduced into the ball valve 600 and the ventilation time.

[0031] The lifting mechanism 41 of this embodiment is a first cylinder, the cylinder body of the first cylinder is fixed to the top of the sealing cover 44, and the piston rod of the first cylinder is hinged to the other end of the linkage swing rod 42. The lifting force of the piston rod of the cylinder drives the linkage swing rod 42 and the cam 43 to move.

[0032] The ball valve 600 air tightness tester of this embodiment further includes a fixing frame 47, a fixing plate 48, a bracket 49 and a second cylinder 410. The cylinder body of the second cylinder 410 is fixed to the bracket 49, the piston rod of the second cylinder 410 is fixed to the fixing plate 48, and the sealing cover 44 is flexibly connected to the fixing frame 47. Driven by the piston rod of the second cylinder 410, the fixing plate 48 can be driven to move up and down, thereby driving the first cylinder and the sealing cover 44 to move up and down as a whole, so as to automatically cover the opening (outlet) of one end of the ball valve 600. More than two sealing covers 44 can be fixed on the fixing plate 48 through the fixing frame 47, so as to synchronously cover and seal multiple ball valves 600.

[0033] like Figure 4 , Figure 5As shown, preferably, the bottom clamping mechanism 302 includes a bottom plate 31, a first linear power mechanism 32, a second linear power mechanism 33, a first clamping mechanism 34, a second clamping mechanism 35 and at least two bases 36 arranged at intervals, the base 36 is fixed to the bottom plate 31, the base 36 is used to limit an opening (inlet) at one end of the ball valve 600, the first linear power mechanism 32 is arranged between two adjacent bases 36; the first clamping mechanism 34 is arranged on the inner side of the two bases 36, and includes a linkage rod 3 21 and a pressure rod 322, one end of the linkage rod 321 is hinged to one end of the pressure rod 322, the other end of the linkage rod 321 is hinged to the output end of the first linear power mechanism 32, the middle part of the pressure rod 322 is hinged to the bottom plate 31, the other end of the pressure rod 322 is used to clamp the inner flange of the ball valve 600, the second linear power mechanism 33 is arranged on the outside of the two bases 36, the second linear power mechanism 33 is connected to the second clamping mechanism 35, and the second clamping mechanism 35 is used to clamp the outer flange of the ball valve 600.

[0034] Through the first linear power mechanism 32, the two pressure rods 322 of the first clamping mechanism 34 can be driven to clamp the ball valves 600 on the two adjacent bases 36, so as to achieve the clamping effect of the inner flanges of the two ball valves 600 in one action. Not only is the installation efficiency high, but also the first linear power mechanism 32 can be more evenly stressed through the distribution and balance of the forces on both sides, the pressure rod 322 can obtain a balanced bending moment and have a longer life, and the adjacent two ball valves 600 can be evenly stressed and not easily deformed; combined with the second linear power mechanism 33 driving the second clamping mechanism 35, the ball valve 600 can obtain a complete clamping effect, and finally the ball valve 600 can be clamped quickly and stably, so as to reduce the deformation of the ball valve 600 caused by the pressure, and improve the accuracy of the airtight test. Among them, since the pressure rod 322 is hinged to the bottom plate 31, the pressure rod 322 forms a lever mechanism, so that the force transmission of the first linear power mechanism 32 can be amplified. Specifically, a support 38 is fixed on the base plate 31 of this embodiment, the middle portion of the pressure rod 322 is hinged to the support 38 , and when the first linear power mechanism 32 contracts, the linkage rod 321 and the pressure rod 322 contract in the support 38 .

[0035] The first linear power mechanism 32 and the second linear power mechanism 33 of this embodiment both use cylinders, and their output ends are piston rods of the cylinders. The linkage rod 321 configured in this embodiment is conducive to increasing the stroke of the piston rod to avoid too fast a pressing speed. At the same time, when the linkage rod 321 and the pressing rod 322 are contracted, they can open enough space for the ball valve 600 to be taken out.

[0036] The second clamping mechanism 35 of this embodiment includes a transmission rod 331 and a pressure plate 332, one end of the pressure plate 332 is hinged to the bottom plate 31, and the other end of the pressure plate 332 has at least two pressure heads 3321 for clamping the outer flange of the ball valve 600, the output end of the second linear power mechanism 33 is hinged to one end of the transmission rod 331, and the other end of the transmission rod 331 is hinged to the middle of the pressure plate 332. The pressure plate 332 has more than two pressure heads 3321, which can be more evenly clamped on the outer flange of the ball valve 600.

[0037] Furthermore, in order to further prevent pressure from damaging the ball valve 600 or deforming the ball valve 600, the clamping mechanism for the airtight test of the ball valve 600 also includes a buffer pad 39, and a plug post 310 protrudes from the buffer pad 39. The buffer pad 39 is respectively plugged into the pressure head 3321 and the other end of the pressure rod 322 through the plug post 310. The configuration of the plug post 310 facilitates the installation of the buffer pad 39.

[0038] To facilitate the testing and installation of the ball valve 600 , the base 36 of this embodiment has a stepped inner cavity 311 , on which a joint 312 is disposed. The top of the joint 312 is used for threaded connection with an opening at one end of the ball valve 600 , and the bottom of the joint 312 is supported by the stepped inner cavity 311 .

[0039] The implementation methods of the present invention are not limited to these. According to the above-mentioned embodiments of the present invention, by using conventional technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the present invention and without conflict, the above-mentioned preferred embodiments may also be modified, replaced or combined in various other forms, and the other embodiments obtained all fall within the scope of protection of the present invention.

Claims

1. A ball valve air tightness testing machine, characterized in that: It includes a frame, a turntable, a clamping tool and an airtight test tool. The turntable is pivotally connected to the frame. The clamping tool and the airtight test tool are distributed around the turntable. The airtight test tool includes a lifting mechanism, a linkage rocker, a cam and a sealing cover. The sealing cover is used to seal one end opening of the ball valve. The cam is hinged to the side of the sealing cover, and the cam is against the outer side of the ball valve. There are several cams, which are evenly distributed around the outer periphery of the sealing cover. The number of linkage rockers is the same as that of the cams. One end of the linkage rocker is hinged to the cam, and the other end of the linkage rocker is hinged to the lifting end of the lifting mechanism. The clamping tool includes a bottom clamping mechanism and a top clamping mechanism. The bottom clamping mechanism is fixed to the turntable and rotates with the turntable and is used to clamp the cam of the ball valve The edge of the ball valve is used to press the top clamping mechanism for clamping the ball valve outlet; the ball valve air tightness testing machine also includes a rotating device for rotating the ball valve handle, the rotating device includes a telescopic cylinder, a rotating motor and a rotating shaft, the telescopic cylinder is fixed to the frame, the body of the rotating motor is fixed to the piston rod of the telescopic cylinder, the output shaft of the rotating motor is connected to one end of the rotating shaft, and the other end of the rotating shaft is used to insert the ball valve handle; the lifting mechanism is a first cylinder, the cylinder body of the first cylinder is fixed to the top of the sealing cover, and the piston rod of the first cylinder is hinged to the other end of the linkage rocker rod; the ball valve air tightness testing machine also includes a fixed frame, a fixed plate, a bracket and a second cylinder, the cylinder body of the second cylinder is fixed to the bracket, and the piston rod of the second cylinder is fixed to the fixed plate.

2. The ball valve air tightness testing machine according to claim 1, characterized in that: The outer side of the sealing cover is provided with locking openings, and each locking opening corresponds to the cam one by one; a hinge seat is provided on the outer edge of the locking opening, one end of the linkage rocker is hinged to the tail end of the cam, and the head end of the cam is placed in the locking opening and hinged to the hinge seat.

3. The ball valve air tightness testing machine according to claim 2, characterized in that: A sealing plug is fixed in the sealing cover, and the sealing plug is sealed with the ball valve through a radial sealing member. The sealing plug extends from the inside of the sealing cover toward the opening direction of the sealing cover.

4. The ball valve air tightness tester according to claim 1, characterized in that: The bottom clamping mechanism includes a bottom plate, a first linear power mechanism, a second linear power mechanism, a first clamping mechanism, a second clamping mechanism and at least two bases arranged at intervals, the base is fixed to the bottom plate, the base is used to limit an opening at one end of the ball valve, and the first linear power mechanism is arranged between two adjacent bases; the first clamping mechanism is arranged on the inner sides of the two bases, and includes a linkage rod and a pressure rod, one end of the linkage rod is hinged to one end of the pressure rod, the other end of the linkage rod is hinged to the output end of the first linear power mechanism, the middle part of the pressure rod is hinged to the bottom plate, and the other end of the pressure rod is used to clamp the inner flange of the ball valve, the second linear power mechanism is arranged on the outer sides of the two bases, the second linear power mechanism is connected to the second clamping mechanism in a transmission connection, and the second clamping mechanism is used to clamp the outer flange of the ball valve.

5. The ball valve air tightness tester according to claim 4, characterized in that: A support is fixed on the bottom plate, the middle part of the pressure rod is hinged to the support, and when the first linear power mechanism contracts, the linkage rod and the pressure rod contract in the support.

6. The ball valve air tightness tester according to claim 5, characterized in that: The second clamping mechanism includes a transmission rod and a pressure plate, one end of the pressure plate is hinged to the bottom plate, and the other end of the pressure plate has at least two pressure heads for clamping the outer flange of the ball valve. The output end of the second linear power mechanism is hinged to one end of the transmission rod, and the other end of the transmission rod is hinged to the middle of the pressure plate.

7. The ball valve air tightness tester according to claim 6, characterized in that: The ball valve air tightness testing machine also includes a buffer pad, on which a plug post protrudes, and the buffer pad is respectively plugged into the pressure head and the other end of the pressure rod through the plug post.

8. The ball valve air tightness tester according to claim 7, characterized in that: The base has a stepped inner cavity, on which a joint is arranged, the top end of the joint is used for threaded connection with an opening at one end of the ball valve, and the bottom end of the joint is supported in the stepped inner cavity.

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