Throttling one-way valve

Abstract

The invention discloses a throttling one-way valve, and relates to the technical field of throttling one-way valves. The ball valve comprises two sets of valve bodies, ball valve cavities are formed in the valve bodies, magnet cavities are formed in the inner walls of the ball valve cavities, switching magnetic blocks are fixedly installed in the magnet cavities, the magnetism of the opposite faces of the switching magnetic blocks in the two sets of valve bodies is opposite, and ball valve elements are rotatably installed in the ball valve cavities. A throttling valve hole and a one-way valve hole are formed in the ball valve element in a penetrating mode, two sets of one-way valve rings are arranged in the one-way valve hole, one-way valve elements are arranged in the two sets of one-way valve rings, four sets of connecting elastic strips are arranged on the outer sides of the one-way valve elements, and the four sets of connecting elastic strips are distributed in a circumferential mode. The ends, away from the one-way valve element, of the connecting elastic strips are provided with hinge pieces. The multifunctional integrated design is adopted, the requirements of multiple valves are integrated in a multifunctional mode, space and cost are saved, and the problem that the maintenance difficulty is large in a narrow space is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of throttle check valves, and particularly relates to a throttle check valve. Background Art

[0002] A throttle check valve is used in a circuit where flow needs to be controlled in one direction while the other direction (reverse) needs to be unobstructed, so as to achieve adjustable speed of the actuator in the forward direction and rapid return in the reverse direction. It is often used to control the movement speed of a cylinder, so it is also called a speed control valve. Such valves are usually used in hydraulic, pneumatic and various fluid control systems, mainly for controlling the fluid flow direction and precisely adjusting the flow rate. Throttle check valves have a wide range of applications in industrial applications, especially in scenarios where flow regulation and one-way flow control are required.

[0003] In a Chinese patent (publication number: CN210290871U), a throttle check valve is disclosed, which includes a check valve assembly and an adjustment assembly; the check valve assembly includes a valve body, a valve seat, a check valve core, a spring, and an oil inlet; a valve hole is provided inside the valve body, and a plurality of oil inlets are provided below the valve body, and the plurality of oil inlets are communicated with each other. A valve seat, a check valve core, and a spring are provided inside the valve body. The valve seat is received in the valve hole and fixedly installed in the valve body. A check valve core is provided above the valve seat. The check valve core is received in the valve hole. The check valve core abuts against the inner surface of the valve body and is in sliding contact with it. The check valve core abuts against the valve seat below; the check valve core is hollow, and a spring is received inside the check valve core. The spring abuts against the inner surface of the check valve core; the adjustment assembly includes a fixed seat, a push rod, and a lead screw; the push rod is cross-shaped, one end of the spring is sleeved on the push rod, the push rod abuts against the inner surface of the valve body and is in sliding contact with it, and the lead screw abuts against the upper part of the push rod; the fixed seat is provided above the valve body, one end of the fixed seat is received in the valve hole and fixedly arranged on the valve body, the fixed seat is hollow, and the push rod and the lead screw are received in the fixed seat.

[0004] The following technical problems exist in the actual use of this patent and the prior art: 1. In small devices or precision control systems, the accuracy requirements for flow control are usually relatively high. Existing throttle check valves may not be able to provide sufficiently precise flow regulation in some cases, especially in the regulation of micro-flows. The design and adjustment range of the throttle orifice are limited.

[0005] 2. Since the throttle check valve needs to control the fluid in a specific direction, if the installation position is improper or the installation direction is wrong, it will cause the fluid to flow reversely, damaging the valve and other components of the system. Especially in places with narrow space or difficult access, it is easy to cause the incorrect installation direction of the valve.

[0006] 3. Since the throttle check valve needs to control the fluid in a specific direction, after installation, the throttle direction of the throttle check valve is fixed and cannot be changed during subsequent use. When the pipeline flow direction changes, the throttle check valve can only be disassembled and reinstalled for adjustment, which is inconvenient to modify.

[0007] 4. The working principle of the throttle check valve depends on the fluid passing through a smaller aperture or channel, which easily causes blockage of the valve by particulate matter, impurities, etc., especially in fluids containing solid particles or viscous substances, resulting in the valve needing to be disassembled and cleaned regularly, and the maintenance in a narrow space is difficult. Summary of the Invention

[0008] The purpose of the present invention is to provide a throttle check valve to solve the above problems.

[0009] The present invention specifically adopts the following technical solutions to achieve the above purpose: A throttle check valve includes two groups of valve bodies. A ball valve cavity is opened inside the valve body. A magnet cavity is opened on the inner wall of the ball valve cavity. A switching magnet is fixedly installed inside the magnet cavity. The opposite surfaces of the switching magnets in the two groups of valve bodies are magnetically opposite. A ball valve core is rotatably installed inside the ball valve cavity. A throttle valve hole and a check valve hole are penetrated through the inside of the ball valve core. A liftable throttle plate is installed inside the throttle valve hole. Two check valve rings are arranged inside the check valve hole. The two check valve rings are located at the port of the check valve hole. A check valve core is arranged inside the two check valve rings. Four connecting elastic strips are arranged on the outer side of the check valve core. The four connecting elastic strips are distributed in a circular pattern. One end of the connecting elastic strip away from the check valve core is provided with a hinge. The hinge is hinged on the inner wall of the check valve hole. An inner magnet is arranged on one side of the check valve core close to the port of the check valve hole.

[0010] Further, an upper sealing sleeve is arranged on the top of the valve body. A valve shaft is arranged on the top of the ball valve core. A guide groove is opened on the outer side of the valve shaft. The inner part of the upper sealing sleeve is hermetically threadedly connected with an adjusting screw sleeve. A transmission protrusion is arranged on the inner wall of the adjusting screw sleeve. The adjusting screw sleeve is sleeved on the outer side of the valve shaft, and the transmission protrusion is inserted into the guide groove.

[0011] Further, a transmission cavity is opened on the top of the ball valve core. The valve shaft is fixedly installed on the top of the transmission cavity. A throttle adjusting shaft rod is threadedly connected inside the valve shaft. The bottom end of the throttle adjusting shaft rod extends into the transmission cavity. A connecting piece is rotatably installed at the bottom of the throttle adjusting shaft rod. The throttle plate is fixedly installed at the bottom of the connecting piece.

[0012] Further, an adjusting cavity is opened at the inner top of the throttle valve hole. The throttle plate can be hermetically stored in the adjusting cavity. The adjusting cavity is communicated with the transmission cavity. The adjusting cavity and the transmission cavity are blocked by a sealing block.

[0013] Furthermore, an indicating support rod is fixedly installed at the top of the valve shaft, and the axis of the indicating support rod is parallel to the axes of the throttle valve hole and the check valve hole.

[0014] Furthermore, an indicating roller is rotatably installed at the bottom of the indicating support rod, and indicating arrows are arranged on both sides of the indicating roller, and the directions of the two groups of indicating arrows are opposite.

[0015] Furthermore, a gear is fixedly installed on one side of the indicating roller close to the valve shaft, a slide rail is arranged on the outer side of the indicating support rod, a rack is slidably connected to the bottom of the slide rail, the rack is meshed with the gear, and limiting baffles are arranged on the tops of the two valve bodies.

[0016] Furthermore, slots are arranged on the tops of the two valve bodies, and the limiting baffles are tightly inserted into the slots.

[0017] Furthermore, two sealing rings are arranged on the inner wall of the ball valve cavity, and the two sealing rings seal the ball valve core and the ball valve cavity.

[0018] The beneficial effects of the present invention are as follows: By arranging the throttle valve hole and the check valve hole in the ball valve core, the present invention can combine the flow control characteristic of the ball valve with the throttle valve hole to realize dual flow control, thereby increasing the flow regulation range and having a wide application range.

[0019] By adopting the design of a bidirectional variable check valve hole, the ball valve drives the check valve core to approach different switching magnets, and the two groups of switching magnets can respectively give the check valve core suction or thrust through the inner magnets to realize the swing of the connecting spring strip. The connecting spring strip can press the check valve core on the two check valve rings, thereby realizing unidirectional switching. The valve can be installed in any orientation during installation. After installation, the direction can be switched. At the same time, during the subsequent pipeline modification process, the valve does not need to be disassembled, and the operation is convenient.

[0020] By directly rotating the ball valve by 180°, the control direction can be switched. By reciprocally rotating the ball valve by 90°, the control direction can also be switched. Through the cooperation of the dual control switching functions, the orientation of the throttle valve hole can be changed without changing the flow direction, and then the internal components of the throttle valve hole can be self-cleaned by liquid backwashing. It can be directly carried out in the flowing pipeline without disassembling the valve, and is suitable for maintenance in narrow spaces.

[0021] In summary, the present invention adopts a multi-functional integrated design, which not only integrates the requirements of multiple valves in a multi-functional manner, saves space and cost, but also solves the problem of difficult maintenance in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 This is the overall explosion diagram of the present invention; Figure 3 This is the explosion diagram of the ball valve core of the present invention; Figure 4 This is the schematic cross-sectional structure diagram of the ball valve core of the present invention; Figure 5 This is the schematic structure of the indicating rod of the present invention Figure 1 ; Figure 6 This is the schematic structure of the indicating rod of the present invention Figure 2 .

[0023] Reference numerals: 1, valve body; 11, ball valve cavity; 12, magnet cavity; 13, switching magnet; 14, upper sealing sleeve; 15, limit baffle; 2, ball valve core; 21, transmission cavity; 22, valve shaft; 23, guide groove; 24, adjusting sleeve; 25, transmission protrusion; 3, sealing ring; 4, throttle valve hole; 41, adjusting cavity; 42, throttle plate; 43, sealing block; 44, throttle adjusting shaft rod; 45, connecting piece; 5, check valve hole; 51, check valve ring; 52, check valve core; 53, hinge piece; 54, connecting spring strip; 55, inner magnet; 6, indicating rod; 61, indicating roller; 62, gear; 63, slide rail; 64, rack. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Embodiment 1, as Figures 1 - 6 shown, a throttle check valve includes two groups of valve bodies 1. A ball valve cavity 11 is formed inside the valve body 1. A magnet cavity 12 is formed in the inner wall of the ball valve cavity 11. A switching magnet 13 is fixedly installed inside the magnet cavity 12. The opposite surfaces of the switching magnets 13 in the two groups of valve bodies 1 have opposite magnetic polarities. A ball valve core 2 is rotatably installed inside the ball valve cavity 11. A throttle valve hole 4 and a check valve hole 5 penetrate through the inside of the ball valve core 2; A liftable throttle plate 42 is installed inside the throttle valve hole 4. Two groups of check valve rings 51 are arranged inside the check valve hole 5. The two groups of check valve rings 51 are located at the ports of the check valve hole 5. A check valve core 52 is arranged inside the two groups of check valve rings 51. Four groups of connecting spring strips 54 are arranged on the outer side of the check valve core 52. The four groups of connecting spring strips 54 are distributed in a circular pattern. One end of the connecting spring strip 54 away from the check valve core 52 is provided with a hinge piece 53. The hinge piece 53 is hinged on the inner wall of the check valve hole 5. An inner magnet 55 is arranged on one side of the check valve core 52 close to the port of the check valve hole 5.

[0026] Two sealing rings 3 are arranged on the inner wall of the ball valve cavity 11. The two sealing rings 3 seal the ball valve core 2 and the ball valve cavity 11.

[0027] The initial state of the valve of the present invention is as shown in the appendix Figure 4 in the state shown (the orientation in this paragraph refers to the appendix Figure 4 ). Under the action of the connecting spring strip 54, the one-way valve core 52 is tightly pressed on the outer one-way valve ring 51. The N pole of the inner magnet block 55 faces downward. The right end of the switching magnet block 13 in the left valve body 1 is the S pole, so the left end of the switching magnet block 13 in the right valve body 1 is the N pole; During installation, the throttle check valve can be installed at any angle without paying attention to controlling the direction. After installation, two methods of adjusting and controlling the direction can be adopted: (1) directly rotate the ball valve core 2 by 180°, thereby changing the orientation of the one-way valve hole 5, so that the control direction can be changed. It should be noted that the ball valve core 2 drives the inner magnet block 55 through the switching magnet block 13 in the left valve body 1, and the opposite poles attract each other, so that the one-way valve core 52 is still tightly pressed on the outer one-way valve ring 51; Rotate the ball valve core 2 back and forth by 90°. The ball valve core 2 drives the inner magnet block 55 to rotate to the switching magnet block 13 in the right valve body 1. The same poles repel each other, and the one-way valve core 52 moves away from the outer one-way valve ring 51. The magnetic force is much greater than the elastic force of the connecting spring strip 54, so that the connecting spring strip 54 swings back to the inner one-way valve ring 51, and then the one-way valve core 52 is tightly pressed on the inner one-way valve core 52. At this time, the flow control direction of the one-way valve hole 5 changes, but the orientation of the one-way valve hole 5 remains unchanged. Two methods can be selected according to the actual operation environment.

[0028] When throttling is required, not only can the throttle plate 42 be controlled to descend to control the flow rate, but also the ball valve core 2 can be controlled to rotate to change the sizes of the inlet and outlet of the throttle valve hole 4. Through dual control, the adjustment range and adjustment accuracy are increased.

[0029] After the valve has been used for a period of time, first rotate the ball valve core 2 by 180°, thereby changing the orientations of the throttle valve hole 4 and the one-way valve hole 5. It should be noted that the ball valve core 2 drives the inner magnet block 55 through the switching magnet block 13 in the right valve body 1. The same poles repel each other, and the one-way valve core 52 moves away from the outer one-way valve ring 51. The magnetic force is much greater than the elastic force of the connecting spring strip 54, so that the connecting spring strip 54 swings back to the inner one-way valve ring 51, and then the one-way valve core 52 is tightly pressed on the inner one-way valve core 52. At this time, the flow control direction of the one-way valve hole 5 changes. Since the orientation of the one-way valve hole 5 also changes, the overall control direction of the valve does not change, which does not affect the normal use of the valve. However, the direction of the throttle valve hole 4 changes, so that the flow rate can backwash the position of the throttle plate 42 without disassembling the valve for maintenance and does not affect the normal operation of the pipeline, which is convenient to use.

[0030] Adopting a multi-functional integrated design, it not only integrates the requirements of multiple valves in a multi-functional manner, saves space and cost, but also solves the problem of difficult maintenance in a narrow space. It should be noted that the valve of the present invention is mainly applied in a small device or a precision control system under a download environment, with a small flow rate. There is no need to connect the elastic strip 54 with a large elastic force. Therefore, the magnetic force of the switching magnet 13 can be correspondingly reduced, and the volume does not need to be set large, which can meet the valve volume requirements. When the connecting elastic strip 54 presses against the one-way valve core 52, it is in an inclined pressing state. Therefore, when the normal flow rate is reached, the liquid pushes the one-way valve core 52 away from the one-way valve ring 51, and the connecting elastic strip 54 only bends, but is not enough to swing to the other side. The design of the magnetic force being much greater than the flow rate. Therefore, under the push of the magnetic force, the displacement distance of the one-way valve core 52 is relatively long, and the connecting elastic strip 54 will not only bend, but also cause the hinge member 53 to swing to the other side, thereby making the connecting elastic strip 54 inclined to the other side and completing the one-way control switching. The specific changes are as shown in the attached Figure 4 shown.

[0031] Embodiment 2, on the basis of the above embodiment, further includes that a top sealing sleeve 14 is arranged at the top of the valve body 1, a valve shaft 22 is arranged at the top of the ball valve core 2, a guide groove 23 is opened on the outer side of the valve shaft 22, an adjusting sleeve 24 is internally and sealingly thread-connected inside the top sealing sleeve 14, a transmission protrusion 25 is arranged on the inner wall of the adjusting sleeve 24, the adjusting sleeve 24 is sleeved on the outer side of the valve shaft 22, and the transmission protrusion 25 is inserted into the guide groove 23.

[0032] This embodiment is a control method for the ball valve core 2. By rotating the adjusting sleeve 24, the adjusting sleeve 24 spirally rises and falls in the top sealing sleeve 14. The adjusting sleeve 24 drives the valve shaft 22 to rotate through the transmission protrusion 25 and the guide groove 23, and the valve shaft 22 drives the ball valve core 2 to rotate. And under the action of the thread self-locking of the adjusting sleeve 24 and the top sealing sleeve 14, it can ensure that the whole ball valve core 2 remains stable, is suitable for an adjustment-free environment, and the thread connection can improve the sealing performance.

[0033] Embodiment 3, on the basis of the above embodiment, further includes that a transmission cavity 21 is opened at the top of the ball valve core 2, the valve shaft 22 is fixedly installed at the top of the transmission cavity 21, a throttle adjustment shaft rod 44 is thread-connected inside the valve shaft 22, the bottom end of the throttle adjustment shaft rod 44 extends into the transmission cavity 21, a connecting member 45 is rotatably installed at the bottom of the throttle adjustment shaft rod 44, and a throttle plate 42 is fixedly installed at the bottom of the connecting member 45.

[0034] This embodiment is a control method for the throttle plate 42. Rotate the throttle adjustment shaft rod 44. Under the action of the valve shaft 22, the throttle adjustment shaft rod 44 rotates downward. The throttle adjustment shaft rod 44 drives the throttle plate 42 to descend through the connecting member 45 for throttle control, and the connecting member 45 only rises and falls with the throttle adjustment shaft rod 44 and does not rotate with the throttle adjustment shaft rod 44.

[0035] Embodiment 4. On the basis of the above embodiments, it further includes that an adjusting cavity 41 is opened at the inner top of the throttle valve hole 4. The throttle plate 42 can be hermetically received in the adjusting cavity 41. The adjusting cavity 41 communicates with the transmission cavity 21, and the adjusting cavity 41 and the transmission cavity 21 are blocked by a sealing block 43.

[0036] With this design, during transmission, the sealing performance of the adjusting cavity 41 can be ensured, and under the dual blocking effect of the sealing block 43 and the valve shaft 22, the liquid will not flow out from the ball valve core 2.

[0037] Embodiment 5. On the basis of the above embodiments, it further includes that an indicating support rod 6 is fixedly installed at the top of the valve shaft 22. The axis of the indicating support rod 6 is parallel to the axes of the throttle valve hole 4 and the check valve hole 5.

[0038] An indicating roller 61 is rotatably installed at the bottom of the indicating support rod 6. Indicating arrows are arranged on both sides of the indicating roller 61, and the directions of the two groups of indicating arrows are opposite.

[0039] A gear 62 is fixedly installed on the side of the indicating roller 61 close to the valve shaft 22. A slide rail 63 is arranged on the outside of the indicating support rod 6. A rack 64 is slidably connected to the bottom of the slide rail 63. The rack 64 meshes with the gear 62. Limiting baffles 15 are arranged on the tops of the two valve bodies 1.

[0040] Slots are arranged on the tops of the two valve bodies 1, and the limiting baffles 15 are tightly inserted into the slots.

[0041] Through the indication of the indicating arrow, the flow direction of the check valve hole 5 can be judged. When the flow direction is adjusted by the adjustment method of reciprocally rotating the ball valve core 2 by 90°, the ball valve core 2 drives the indicating support rod 6 to rotate through the valve shaft 22. When rotating by 90°, the rack 64 abuts against the limiting baffle 15. The rack 64 drives the indicating roller 61 to rotate by 180° through the gear 62. The reverse arrow on the other side of the indicating roller 61 rotates to the front, and thus the one-way flow direction of the valve can be judged; When the flow direction is adjusted by the adjustment method of directly rotating the ball valve core 2 by 180°, the ball valve core 2 drives the indicating support rod 6 to rotate through the valve shaft 22. When rotating by 90°, the rack 64 abuts against the limiting baffle 15. The rack 64 drives the indicating roller 61 to rotate by 180° through the gear 62. The reverse arrow on the other side of the indicating roller 61 rotates to the front, and the front arrow surface is located on the back. Subsequently, the limiting baffle 15 is pulled out from the slot. When the ball valve core 2 continues to rotate by 90°, it is equivalent to the indicating roller 61 turning over. Therefore, the front arrow surface faces the front, and the direction indicated by the front arrow is the one-way flow direction of the valve.

[0042] When backwashing is required, first pull out the limiting baffle 15 from the slot, which is equivalent to the indicating support rod 6 directly driving the indicating roller 61 to rotate by 180°. The indicating roller 61 turns over, and the reverse arrow faces the front, and the reverse arrow points to the original flow direction.

[0043] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A throttle check valve, comprising two groups of valve bodies (1), characterized in that, A ball valve cavity (11) is formed inside the valve body (1). A magnet cavity (12) is formed on the inner wall of the ball valve cavity (11). A switching magnet block (13) is fixedly installed inside the magnet cavity (12). The opposite faces of the switching magnet blocks (13) in the two valve bodies (1) have opposite magnetic polarities. A ball valve core (2) is rotatably installed inside the ball valve cavity (11). A throttle valve hole (4) and a check valve hole (5) are formed through the ball valve core (2). A liftable throttle plate (42) is installed inside the throttle valve hole (4). Two check valve rings (51) are arranged inside the check valve hole (5). The two check valve rings (51) are located at the port of the check valve hole (5). A check valve core (52) is arranged inside the two check valve rings (51). Four connecting elastic bars (54) are arranged on the outer side of the check valve core (52). The four connecting elastic bars (54) are distributed in a circular pattern. One end of the connecting elastic bar (54) away from the check valve core (52) is provided with a hinge member (53). The hinge member (53) is hinged to the inner wall of the check valve hole (5). An inner magnet block (55) is arranged on one side of the check valve core (52) close to the port of the check valve hole (5).

2. The throttle check valve according to claim 1, characterized in that, An upper sealing sleeve (14) is arranged at the top of the valve body (1). A valve shaft (22) is arranged at the top of the ball valve core (2). A guide groove (23) is formed on the outer side of the valve shaft (22). An adjusting screw sleeve (24) is hermetically threadedly connected inside the upper sealing sleeve (14). A transmission protrusion (25) is arranged on the inner wall of the adjusting screw sleeve (24). The adjusting screw sleeve (24) is sleeved on the outer side of the valve shaft (22), and the transmission protrusion (25) is inserted into the guide groove (23).

3. The throttle check valve according to claim 2, characterized in that, A transmission cavity (21) is formed at the top of the ball valve core (2). The valve shaft (22) is fixedly installed at the top of the transmission cavity (21). A throttle adjusting shaft rod (44) is threadedly connected inside the valve shaft (22). The bottom end of the throttle adjusting shaft rod (44) extends into the transmission cavity (21). A connecting member (45) is rotatably installed at the bottom of the throttle adjusting shaft rod (44). The throttle plate (42) is fixedly installed at the bottom of the connecting member (45).

4. The throttle check valve according to claim 3, characterized in that, An adjusting cavity (41) is formed at the inner top of the throttle valve hole (4). The throttle plate (42) can be hermetically stored in the adjusting cavity (41). The adjusting cavity (41) is communicated with the transmission cavity (21). The adjusting cavity (41) and the transmission cavity (21) are blocked by a sealing block (43).

5. The throttle check valve according to claim 4, characterized in that, An indicating support rod (6) is fixedly installed at the top of the valve shaft (22). The axis of the indicating support rod (6) is parallel to the axes of the throttle valve hole (4) and the check valve hole (5).

6. The throttle check valve according to claim 5, wherein An indicating roller (61) is rotatably installed at the bottom of the indicating support rod (6). Indication arrows are arranged on both sides of the indicating roller (61). The directions of the two indication arrows are opposite.

7. The throttle check valve according to claim 6, characterized in that, A gear (62) is fixedly installed on one side of the indicating roller (61) close to the valve shaft (22). A slide rail (63) is arranged on the outer side of the indicating support rod (6). A rack (64) is slidably connected to the bottom of the slide rail (63). The rack (64) is meshed with the gear (62). Limit baffle plates (15) are arranged at the tops of the two valve bodies (1).

8. The throttle check valve according to claim 7, characterized in that, Slots are provided at the tops of the two groups of the valve bodies (1), and the limit baffle plates (15) are tightly inserted into the slots.

9. A throttle check valve according to any one of claims 1-8, characterized in that Two sealing rings (3) are provided on the inner wall of the ball valve cavity (11), and the two sealing rings (3) seal the ball valve core (2) and the ball valve cavity (11).

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