Low-temperature ball valve

Abstract

The utility model relates to a low-temperature ball valve which comprises a valve body, a ball body (7), a valve seat, a bottom cover (12) and a valve rod (9), and the valve body comprises a left valve body (1), a middle valve body (8) and a right valve body (11). The valve seat comprises a front valve seat (2) and a rear valve seat (10), and the left valve body (1), the right valve body (11) and the middle valve body (8) are connected together through bolts; the top of the ball body (7) is provided with a square groove for placing the valve rod (9), and the bottom of the ball body (7) is provided with an integrally formed boss, so that the processing procedures and materials are fewer, and the sealing effect is more reliable; the boss is located in a groove in the bottom cover (12). Through the design, the interchangeability of internal parts of the top-mounted ball valve and the side-mounted ball valve can be improved, the maintenance cost and the production cost of the side-mounted ball valve are reduced, the sealing performance of the side-mounted ball valve is improved, and the leakage risk of the position of the middle valve body is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of ball valve technology, and specifically relates to a cryogenic ball valve. Background Technology

[0002] Ball valves are widely used in industries such as petrochemicals due to their low fluid resistance, convenient and rapid opening and closing, good sealing performance, and self-relief in the cavity. In pipelines, they mainly function to cut off, distribute, and change the direction of media flow. According to their structure, ball valves can be mainly divided into top-mounted ball valves and side-mounted ball valves. Top-mounted ball valves can be maintained online, but require special tooling, increasing costs; side-mounted ball valves are relatively easy to manufacture, but are difficult to maintain promptly.

[0003] Currently, top-mounted ball valves typically use a design where the upper square groove connects to the valve stem, and the lower boss is secured in a groove on the valve seat. Side-mounted ball valves, on the other hand, often use forged valve bodies, making it difficult to machine the grooves on the inner wall of the valve body. Therefore, current side-mounted ball valves primarily use a "lower valve stem + bottom cover" design. This results in incompatibility between top-mounted and side-mounted ball valves. Furthermore, the bottom of the middle valve body needs to be machined into a flat surface to fit the bottom cover, ultimately making the manufacturing process of side-mounted ball valves more complex. Additionally, a seal is required at the lower valve stem, which, compared to an integral structure, poses a risk of leakage.

[0004] For example, Chinese invention patent application CN 119467758 A discloses a cryogenic ball valve and its usage method. The ball valve includes: a valve body, a ball core, and a valve stem; a fixed disc with a through hole is fixed on the valve stem; the valve stem and the ball core can rotate relative to each other at a certain angle and rotate together at their extreme rotation positions; the valve cover has a second inner cavity communicating with the central cavity and a pair of first inner cavities; the valve body has a closed pipe connecting the central cavity and upstream of the valve body; when the valve stem is at the first extreme position A, the through hole communicates with one of its first inner cavities for pressure relief; when the valve stem is at position B, the through hole communicates with the second inner cavity and the pipe is opened for venting; when the valve stem is at the second extreme position C, the through hole communicates with the other first inner cavity for pressure relief. This invention not only allows for pressure relief of the central cavity when the ball core is closed or open, but also allows for venting of the central cavity, reducing the vaporization of cryogenic gas within the central cavity and preventing cryogenic gas from entering the pipeline and causing damage. However, the lower valve stem lacks a seal, posing a risk of leakage. Summary of the Invention

[0005] To address the problems existing in the prior art, this utility model proposes a cryogenic ball valve. By setting an elastic gasket between the ball and the bottom cover, the interchangeability of internal components of the top-mounted and side-mounted ball valves is improved, reducing the maintenance and production costs of the side-mounted ball valve; the sealing performance of the side-mounted ball valve is improved, and the risk of leakage at the valve body location is reduced.

[0006] The utility model provides a low temperature ball valve, it includes valve body, ball, valve seat, bottom cover and valve rod, the valve body includes left valve body, middle valve body and right valve body, the valve seat includes front valve seat 2 and rear valve seat, left valve body, right valve body and middle valve body are connected together through bolt, the top of ball is provided with square slot and places valve rod, the bottom of ball is equipped with the boss of integrated mould, and the processing procedure and the material are less, and the sealing effect is more reliable, the boss is located in the recess on the bottom cover, the boss is located in the circular recess on the bottom cover, and the recess between the boss and the bottom cover is equipped with elastic gasket, through above -mentioned design, can promote the interchangeability of top -loading and side -loading ball valve internal spare, reduces the maintenance cost and production cost of side -loading ball valve, promotes the sealing performance of side -loading ball valve, reduces the leakage risk of middle valve body position.

[0007] Preferably, a plurality of threaded holes are formed in the inner wall of the middle valve body, and the middle valve body is connected to the bottom cover by screws.

[0008] Preferably, in any of the above-mentioned solutions, the middle valve body is an integral structure, without a through hole for reserving the position of the lower valve rod, and without a fixing device for the lower valve rod and accessories required for sealing the lower valve rod, thereby significantly improving the sealing performance of the side-mounted ball valve and reducing the production and operation and maintenance costs.

[0009] Preferably, in any of the above-mentioned solutions, the ball is located between the left valve body and the right valve body, a front valve seat is arranged between the left valve body and the ball, a rear valve seat is arranged between the right valve body and the ball, and a lip-shaped sealing ring, a packing and a spring are arranged at the contact positions of the left valve body and the front valve seat and the right valve body and the rear valve seat, thereby achieving multiple sealing effects, and considering that the medium pressure in the middle cavity is too high, the spring can provide an initial compression force to achieve self-pressure relief through the front valve seat.

[0010] Preferably, in any of the above-mentioned solutions, a sealing ring is arranged at the contact positions of the front valve seat and the ball and the rear valve seat and the ball, thereby achieving further sealing.

[0011] Preferably, in any of the above-mentioned solutions, the bottom cover is a rectangular structure with an arc surface at the bottom, so that the bottom of the bottom cover is attached to the inner wall of the middle valve body, and stepped holes are formed at the four corners of the bottom cover, and the bottom cover is fixedly connected to the inner wall of the middle valve body by bolts.

[0012] Preferably, in any of the above-mentioned solutions, a composite shaft sleeve is arranged on the inner wall of the circular recess of the bottom cover, thereby ensuring smooth opening and closing of the valve core, and the composite shaft sleeve is sleeved on the boss of the ball.

[0013] In summary, the low-temperature ball valve has the following advantages: the contact parts of the left valve body and the front valve seat and the right valve body and the rear valve seat are all provided with lip-shaped sealing rings, packing and springs, so that multiple sealing effects are achieved, and when the medium pressure in the middle cavity is too large, the spring can provide initial compression force to realize self-pressure relief through the front valve seat; the middle valve body is an integral structure, without the need to open a through hole to reserve the position of the lower valve rod, and the fixing device of the lower valve rod and the accessories required for sealing of the lower valve rod are also saved, which not only significantly improves the sealing performance of the side-mounted ball valve, but also reduces the production and operation and maintenance costs; the bottom of the ball body is provided with an integrally formed boss, which requires less processing procedures and materials and has more reliable sealing effect; the boss is located in the groove on the bottom cover; the boss is located in the circular groove on the bottom cover; an elastic gasket is arranged between the boss and the groove on the bottom cover, through the above design, the interchangeability of the internal parts of the top-mounted and side-mounted ball valves is improved, the maintenance cost and production cost of the side-mounted ball valve are reduced, the sealing performance of the side-mounted ball valve is improved, and the leakage risk of the middle valve body position is reduced.

[0014] BRIEF DESCRIPTION OF DRAWINGS

[0015] Left valve body 1, front valve seat 2, lip-shaped sealing ring 3, packing 4, spring 5, sealing ring 6, ball body 7, middle valve body 8, threaded hole 81, valve rod 9, rear valve seat 10, right valve body 11, bottom cover 12, circular groove 121, stepped hole 122, composite shaft sleeve 13, elastic gasket 14. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure schematic view of a preferred embodiment of the low-temperature ball valve according to the utility model.

[0017] Figure 2 It is a structure schematic view of a preferred embodiment of the low-temperature ball valve according to the utility model. Figure 1 It is a structure schematic view of a preferred embodiment of the low-temperature ball valve according to the utility model.

[0018] Figure 3 It is a structure schematic view of a preferred embodiment of the low-temperature ball valve according to the utility model. Figure 1 It is a structure schematic view of a preferred embodiment of the low-temperature ball valve according to the utility model. DETAILED DESCRIPTION

[0019] The utility model will be further described below in combination with the drawings and examples.

[0020] As Figure 1As shown, according to the structural schematic diagram of a preferred embodiment of the low-temperature ball valve of the utility model, the utility model discloses a low-temperature ball valve which comprises a valve body, a ball 7, a valve seat, a bottom cover 12 and a valve rod 9, the valve body comprises a left valve body 1, a middle valve body 8 and a right valve body 11, the valve seat comprises a front valve seat 2 and a rear valve seat 10, the left valve body 1, the right valve body 11 and the middle valve body 8 are connected together through bolts, a square groove is formed in the top of the ball 7 to place the valve rod 9, a boss is integrally formed at the bottom of the ball 7, and the processing procedure and the material are less, and the sealing effect is more reliable, the boss is located in the groove on the bottom cover 12, the boss is located in the circular groove 121 on the bottom cover 12 (see Figure 2 As shown) and an elastic gasket 14 is arranged between the boss and the groove on the bottom cover 12, through the above design, the interchangeability of the internal parts of the top-mounted and side-mounted ball valve can be improved, the maintenance cost and the production cost of the side-mounted ball valve can be reduced, the sealing performance of the side-mounted ball valve can be improved, and the leakage risk of the middle valve body position can be reduced.

[0021] In the embodiment, the ball 7 is located between the left valve body 1 and the right valve body 11, the front valve seat 2 is arranged between the left valve body 1 and the ball 7, the rear valve seat 10 is arranged between the right valve body 11 and the ball 7, and the contact positions of the left valve body 1 and the front valve seat 2 and the right valve body 11 and the rear valve seat 10 are all provided with a lip-shaped sealing ring 3, a packing 4 and a spring 5, so that the multiple sealing effect is achieved, and considering that the medium pressure in the middle cavity is too large, the initial compression force provided by the spring 5 can be unloaded through the front valve seat 2.

[0022] In the embodiment, the contact positions of the front valve seat 2 and the ball 7 and the rear valve seat 10 and the ball 7 are all provided with a sealing ring 6, and further sealing is achieved.

[0023] The installation process of the low-temperature ball valve of the utility model is as follows: during installation, first, the middle valve body 8 is fixed, then the arc surface of the bottom cover 12 is attached to the middle valve body 8, and the bottom cover 12 and the middle valve body 8 are connected and fixed through screws, then the elastic gasket 14 and the composite shaft sleeve 13 are respectively installed at the circular groove 121 of the bottom cover 12, and the ball 7 is installed at the circular groove 121 of the bottom cover from the side, secondly, the sealing ring 6, the packing 4, the spring 5 and the lip-shaped sealing ring 3 are installed on the front valve seat 2 and the rear valve seat 10, then the front valve seat 2 and the rear valve seat 10 are respectively installed in the left valve body 1 and the right valve body 11, and finally the left valve body 1 and the right valve body 11 are connected with the middle valve body 8 through bolts to complete the installation of the valve body.

[0024] The working process of the low-temperature ball valve is as follows: when the valve is closed, the ball 7 rotates 90° to make the hole in the middle part of the ball 7 perpendicular to the pipeline, thereby blocking the medium flow, and the bidirectional sealing structure ensures that the front valve seat 2 and the rear valve seat 10 are tightly attached to the ball 7, thereby effectively preventing the low-temperature medium from leaking; when the valve is opened, the ball 7 rotates 90° again to make the hole in the middle part of the ball 7 aligned with the pipeline, so that the medium can pass through the full diameter, thereby reducing the flow resistance.

[0025] Referring to Figure 2 the low-temperature ball valve of the utility model Figure 1 the structure diagram of the bottom cover in the preferred embodiment.

[0026] In the embodiment, the bottom cover 12 is a rectangular structure with an arc surface at the bottom, so that the bottom of the bottom cover 12 is attached to the inner wall of the middle valve body 8; the four corners of the bottom cover 12 are provided with stepped holes 122, and the bottom cover 12 is fixedly connected to the inner wall of the middle valve body 8 by bolts.

[0027] In the embodiment, the inner wall of the circular groove 121 on the bottom cover 12 is provided with a composite shaft sleeve 13, which ensures the smooth opening and closing of the valve core; the composite shaft sleeve 13 is sleeved on the boss of the ball 7.

[0028] Finally referring to Figure 3 the low-temperature ball valve of the utility model Figure 1 the structure diagram of the middle valve body in the preferred embodiment.

[0029] In the embodiment, the inner wall of the middle valve body 8 is provided with a plurality of threaded holes 81, and the middle valve body 8 is connected to the bottom cover 12 by screws.

[0030] In the embodiment, the middle valve body 8 is an integral structure, without a through hole reserved for the lower valve rod position, and without a fixing device for the lower valve rod and accessories required for sealing the lower valve rod, which not only significantly improves the sealing performance of the side-mounted ball valve, but also reduces the production and operation and maintenance costs.

[0031] It is not difficult for those skilled in the art to understand that the low-temperature ball valve of the utility model includes any combination of the parts in the specification. Due to the limited length and in order to make the specification concise, these combinations are not introduced in detail here, but after reading the specification, it is self-evident that any combination of the parts constituting the utility model according to the specification is within the scope of the utility model.

Claims

1. A cryogenic ball valve, comprising a valve body, a ball (7), a valve seat, a bottom cover (12), and a valve stem (9), wherein the valve body comprises a left valve body (1), a middle valve body (8), and a right valve body (11); the valve seat comprises a front valve seat (2) and a rear valve seat (10), and the left valve body (1), the right valve body (11), and the middle valve body (8) are connected together by bolts; a square groove is provided on the top of the ball (7) to accommodate the valve stem (9), characterized in that: The bottom of the sphere (7) is provided with an integrally formed boss; the boss is located in the groove on the bottom cover (12); the boss is located in the circular groove (121) on the bottom cover (12); an elastic gasket (14) is provided between the boss and the groove on the bottom cover (12).

2. The cryogenic ball valve as described in claim 1, characterized in that: The inner wall of the middle valve body (8) has multiple threaded holes (81), and the middle valve body (8) is connected to the bottom cover (12) by screws.

3. The cryogenic ball valve as described in claim 1 or 2, characterized in that: The valve body (8) is an integral structural component.

4. The cryogenic ball valve as described in claim 1, characterized in that: The ball (7) is located between the left valve body (1) and the right valve body (11); a front valve seat (2) is provided between the left valve body (1) and the ball (7); a rear valve seat (10) is provided between the right valve body (11) and the ball (7); a lip seal (3), a packing (4) and a spring (5) are provided at the contact points between the left valve body (1) and the front valve seat (2) and between the right valve body (11) and the rear valve seat (10).

5. The cryogenic ball valve as described in claim 1 or 4, characterized in that: A sealing ring (6) is provided at the contact points between the front valve seat (2) and the ball (7) and the rear valve seat (10) and the ball (7).

6. The cryogenic ball valve as described in claim 1 or 2, characterized in that: The bottom cover (12) is a rectangular structural component with an arc-shaped bottom; stepped holes (122) are opened at the four corners of the bottom cover (12), and the bottom cover (12) is fixedly connected to the inner wall of the middle valve body (8) by bolts.

7. The cryogenic ball valve as described in claim 1, characterized in that: A composite bushing (13) is provided on the inner wall of the circular groove (121) on the bottom cover (12); the composite bushing (13) is fitted on the protrusion of the sphere (7).

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