Low-temperature ball valve with anti-loosening structure

Abstract

The utility model relates to a low-temperature ball valve with an anti-loose structure, which comprises a valve body (1), a ball body (11), a valve seat (2), a valve rod and a valve cover (12), a sealing ring (10) is arranged between the ball body (11) and the valve seat (2), a lip-shaped sealing ring is arranged between the valve seat (2) and the valve body (1), and the internal structure of the ball valve is sealed, so that the risk of leakage is reduced; the axial outer wall of the valve seat (2) is provided with an external thread, the external thread is matched with the spring seat (7), the first adjusting nut (8) and the second adjusting nut (9), the screwing direction of the internal thread of the first adjusting nut (8) is opposite to that of the internal thread of the second adjusting nut (9), and when the spring seat (7) encounters impact and vibration, the first adjusting nut (8) can be driven to rotate in the nut loosening direction, so that the valve seat (2) is loosened. And the second adjusting nut (9) can rotate in the pressing direction, so that the high-reliability anti-loosening effect is achieved, the leakage risk of the ball valve is effectively reduced, and the stability and reliability of the valve seat of the low-temperature ball valve are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ball valve, concretely relates to a low temperature ball valve with anti-loose structure. BACKGROUND

[0002] Low temperature ball valve is widely used in the liquefaction, storage and transportation of LNG due to its rapid opening and closing, high reliability and good safety. At present, the low temperature ball valve commonly used adopts a spring to provide initial compression force, and the medium pressure realizes sealing.

[0003] Under low temperature environment, the internal components of the valve will change accordingly with temperature. Under the impact of medium pressure, thermal stress and vibration, the adjusting nut adjusting the position of the spring seat is prone to loosening, which seriously affects the sealing performance of the low temperature ball valve and has an impact on the safety and reliability of the low temperature valve.

[0004] For example, the Chinese utility model patent with the authorized publication number CN 211550611 U discloses a ball valve with a main valve seat anti-loose structure, which comprises a valve body, a valve cover, a valve core, a valve stem, a main valve seat and a disc spring. The valve body has a first valve port, the valve body is fixedly connected with the valve cover and forms a valve cavity, the valve cover has a second valve port, and the first valve port and the second valve port are in communication. The valve core is located in the valve cavity, the valve stem is rotatably connected to the valve body, one end of the valve stem is fixed to the valve core, and the other end of the valve stem is located outside the valve body. The valve cavity has a first annular notch, the main valve seat is located in the first annular notch, the main valve seat has a sealing surface, and the sealing surface abuts against the outer surface of the valve core. The disc spring has a connecting hole, the valve body has a threaded hole, the disc spring is fixed to the valve body by a bolt, and the disc spring presses the main valve seat on the valve body. By using the anti-loose feature of the disc spring, the main valve seat and the valve body are always tightly connected and in a sealed state, avoiding leakage of the ball valve. However, the disc spring is prone to deformation after long-term work under the impact of medium pressure, thermal stress and vibration, causing leakage of the ball valve. SUMMARY

[0005] In view of the problems existing in the prior art, the utility model provides a low temperature ball valve with an anti-loose structure. Two nuts with opposite rotation directions are installed on the spring seat installed axially on the valve seat to prevent loosening, effectively reducing the risk of loosening of the spring seat caused by excessive flow channel pressure or impact and vibration, and improving the stability and reliability of the low temperature ball valve seat.

[0006] The utility model provides a low temperature ball valve with anti-loose structure, which comprises a valve body, a ball body, a valve seat, a valve rod and a valve cover, a sealing ring is arranged between the ball body and the valve seat, a lip-shaped sealing ring is arranged between the valve seat and the valve body, the internal structure of the ball valve is sealed, thereby reducing the risk of leakage, an external thread is formed on the axial outer wall of the valve seat, the external thread is matched with a spring seat, a first adjusting nut and a second adjusting nut, the internal thread rotation direction of the first adjusting nut is opposite to that of the second adjusting nut, when the spring seat is impacted or vibrated, the first adjusting nut is rotated in the loosening direction of the nut, and the second adjusting nut is rotated in the tightening direction, thereby realizing the anti-loose effect with high reliability and effectively reducing the risk of ball valve leakage.

[0007] Preferably, the end of the valve seat is provided with an annular groove; the lip-shaped sealing ring comprises a thrust ring, a spring ring and a seal ring, and the thrust ring is located in the annular groove to limit the entire lip-shaped sealing ring. During operation, under the action of medium pressure, the axial of the thrust ring compresses the spring ring, and then expands the seal ring outward, thereby increasing the sealing performance of the low temperature ball valve.

[0008] Preferably, in any of the above-mentioned solutions, a groove ring is formed on the front end surface of the spring seat, and a spring is arranged in the groove ring to provide initial compression force for the valve seat.

[0009] Preferably, in any of the above-mentioned solutions, the spring seat is in clearance fit with the valve seat, and the spring seat can adjust the extension amount of the spring according to the actual medium pressure, which has the characteristics of flexible adjustment and wide application range.

[0010] Preferably, in any of the above-mentioned solutions, the spring seat, the first adjusting nut and the second adjusting nut are sequentially arranged on the valve seat in the axial direction from left to right. The spring seat is limited and adjusted by the second adjusting nut, the first adjusting nut is connected with the valve seat through threads, the second adjusting nut is arranged on the right side of the first adjusting nut, and the internal thread rotation direction of the second adjusting nut is opposite to that of the first adjusting nut. When the spring seat is impacted or vibrated, the first adjusting nut is rotated in the loosening direction of the nut, and the second adjusting nut is rotated in the tightening direction, thereby realizing the anti-loose effect with high reliability and effectively reducing the risk of ball valve leakage.

[0011] Preferably, in any of the above-mentioned solutions, a plurality of corresponding cylindrical holes are uniformly formed on the first adjusting nut and the second adjusting nut. During the installation of a small-sized valve, the adjusting nuts can be adjusted by aligning the cylindrical holes with a wrench, which is convenient for installation and maintenance.

[0012] Preferably, in any of the above-mentioned solutions, a drip tray is arranged at the middle part of the valve rod, and sleeve pipes are arranged at both ends of the valve body.

[0013] In summary, the cryogenic ball valve with anti-loosening structure of this utility model has the following advantages: A spring seat, a first adjusting nut, and a second adjusting nut are fitted on the axial outer wall of the valve seat. The internal threads of the first and second adjusting nuts rotate in opposite directions. When the spring seat encounters impact or vibration, it will cause the first adjusting nut to rotate in the loosening direction, while the second adjusting nut will rotate in the tightening direction, thus achieving a highly reliable anti-loosening effect and effectively reducing the risk of ball valve leakage. Multiple corresponding cylindrical holes are evenly distributed on the first and second adjusting nuts. During the installation of small-sized valves, the adjusting nuts can be adjusted by aligning a wrench with the cylindrical holes, facilitating installation and maintenance.

[0014] Explanation of icon numbers

[0015] Valve body 1, valve seat 2, thrust ring 3, annular groove 31, spring ring 4, plug ring 5, spring 6, spring seat 7, groove ring 71, first adjusting nut 8, second adjusting nut 9, sealing ring 10, ball 11, valve cover 12, drip tray 13, sleeve 14. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a preferred embodiment of a cryogenic ball valve with an anti-loosening structure according to the present invention.

[0017] Figure 2 In the cryogenic ball valve with anti-loosening structure according to this utility model Figure 1 Enlarged view of point A in the preferred embodiment shown. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 , Figure 2 The diagram shows a preferred embodiment of the cryogenic ball valve with an anti-loosening structure according to this utility model. The purpose of this utility model is to provide a cryogenic ball valve with an anti-loosening structure, comprising a valve body 1, a ball 11, a valve seat 2, a valve stem, and a valve cover 12. A sealing ring 10 is provided between the ball 11 and the valve seat 2, and a lip-shaped sealing ring is provided between the valve seat 2 and the valve body 1 to seal the internal structure of the ball valve, thereby reducing the risk of leakage. An external thread is formed on the axial outer wall of the valve seat 2, which engages with a spring seat 7, a first adjusting nut 8, and a second adjusting nut 9. The internal threads of the first adjusting nut 8 and the second adjusting nut 9 rotate in opposite directions. When the spring seat 7 encounters impact or vibration, it will cause the first adjusting nut 8 to rotate in the slack direction, while the second adjusting nut 9 will rotate in the tightening direction, thereby achieving a highly reliable anti-loosening effect and effectively reducing the risk of ball valve leakage.

[0020] In the embodiment, the intermediate part of the valve stem is provided with a drip tray 13; the two ends of the valve body 1 are provided with sleeves 14.

[0021] Further referring to Figure 2 As shown in the preferred embodiment, the low-temperature ball valve with anti-loosening structure according to the utility model Figure 1 As shown in the enlarged view of position A in the preferred embodiment.

[0022] In the embodiment, the end of the valve seat 2 is provided with an annular groove 31; the lip-shaped sealing ring comprises a thrust ring 3, a spring ring 4 and a seal ring 5, and the thrust ring 31 is located in the annular groove 31 so as to limit the entire lip-shaped sealing ring. During operation, under the action of the medium pressure, the thrust ring 3 is axially pressed against the spring ring 4, and then the seal ring 5 is expanded outward, so as to increase the sealing performance of the low-temperature ball valve.

[0023] In the embodiment, the front end face of the spring seat 7 is provided with a groove ring 71, and the spring 6 is arranged in the groove ring 71, which provides the initial pressing force for the valve seat 2.

[0024] In the embodiment, the spring seat 7 is in clearance fit with the valve seat 2, and the spring seat 7 can adjust the extension amount of the spring 6 according to the actual medium pressure, which has the characteristics of flexible adjustment and wide application range.

[0025] In the embodiment, the spring seat 7, the first adjusting nut 8 and the second adjusting nut 9 are sequentially arranged in the axial direction of the valve seat 2 from left to right. The spring seat 7 is limited and adjusted by the second adjusting nut 9, the first adjusting nut 8 is connected with the valve seat 2 through threads, the second adjusting nut 9 is arranged on the right side of the first adjusting nut 8, the internal thread of the second adjusting nut 9 is opposite in rotation direction to that of the first adjusting nut 8, when the spring seat encounters impact and vibration, the first adjusting nut 8 will rotate in the nut loosening direction, while the second adjusting nut 9 will rotate in the pressing direction, so as to realize the anti-loosening effect with high reliability and effectively reduce the risk of ball valve leakage.

[0026] In the embodiment, a plurality of corresponding cylindrical holes are uniformly arranged on the first adjusting nut 8 and the second adjusting nut 9, and during the installation of the small-size valve, the adjusting nuts can be adjusted by the wrench through the alignment of the cylindrical holes, which is convenient for installation and maintenance.

[0027] It is not difficult for those skilled in the art to understand that the low-temperature ball valve with anti-loosening structure comprises any combination of the parts in the specification. Due to the limited length and in order to make the specification brief, these combinations are not introduced in detail here, but after reading the specification, it is self-evident that the scope of the utility model comprising any combination of the parts in the specification.

Claims

1. A cryogenic ball valve with an anti-loosening structure, comprising a valve body (1), a ball (11), a valve seat (2), a valve stem, and a valve cover (12), wherein a sealing ring (10) is provided between the ball (11) and the valve seat (2), characterized in that: A lip seal is provided between the valve seat (2) and the valve body (1); an external thread is provided on the axial outer wall of the valve seat (2), and the external thread cooperates with the spring seat (7), the first adjusting nut (8) and the second adjusting nut (9), and the internal threads of the first adjusting nut (8) and the second adjusting nut (9) are opposite in direction.

2. The cryogenic ball valve with anti-loosening structure as described in claim 1, characterized in that: The valve seat (2) has an annular groove (31) at its end; the lip seal includes a thrust ring (3), a spring ring (4) and a plug ring (5), with the thrust ring (31) located in the annular groove (31).

3. The cryogenic ball valve with anti-loosening structure as described in claim 1, characterized in that: The front end face of the spring seat (7) has a groove ring (71), and a spring (6) is provided inside the groove ring (71). The spring (6) provides the initial clamping force to the valve seat (2).

4. The cryogenic ball valve with anti-loosening structure as described in claim 1 or 2, characterized in that: The spring seat (7) and the valve seat (2) are fitted with a clearance.

5. The cryogenic ball valve with anti-loosening structure as described in claim 1, characterized in that: The valve seat (2) is axially mounted from left to right with spring seat (7), first adjusting nut (8) and second adjusting nut (9).

6. The cryogenic ball valve with anti-loosening structure as described in claim 1 or 5, characterized in that: The first adjusting nut (8) and the second adjusting nut (9) have multiple corresponding cylindrical holes evenly distributed on them.

7. The cryogenic ball valve with anti-loosening structure as described in claim 1, characterized in that: The valve stem is provided with a drip tray (13) in the middle; both ends of the valve body (1) are provided with sleeves (14).

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