Ultralow-temperature fixed ball valve

Abstract

The utility model discloses an ultralow-temperature fixed ball valve which comprises a valve body, a fixed shaft is arranged on the inner side of the valve body, a first sliding bearing is fixedly installed on the outer side of the fixed shaft, a first sealing ring is arranged on the inner side of the valve body, a second sealing ring is arranged on the inner side of the valve body, and an upstream valve seat is arranged at the upper end of the second sealing ring. And a thrust washer is arranged at the upper end of the fixed shaft. According to the ultralow-temperature fixed ball valve, the valve rod of the ultralow-temperature fixed ball valve is of an anti-blow-out structure, the valve is frequently operated under the low-temperature working condition, internal parts of the valve can avoid jamming, meshing, scratching and the like, cold insulation can be facilitated by adopting the lengthened valve cover of a lengthened structure, the stuffing box is prevented from freezing, and sealing failure is avoided; the sealing performance of the packing can be guaranteed to be effective for a long time, the service life is prolonged, and good sealing performance can be guaranteed in a low-temperature environment through the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring which are sealed through the spring energy storage rings.

Description

Technical Field

[0001] This utility model relates to the technical field of ball valves, specifically to a cryogenic fixed ball valve. Background Technology

[0002] Cast steel ball valves were first introduced in the 1950s. With the rapid development of science and technology and the continuous improvement of production processes and product structures, they have quickly become a major type of valve in just a few decades. Compared with forged steel ball valves, cast steel ball valves have advantages such as lower cost, less machining allowance, and shorter machining time. Natural gas is currently the world's best energy source, and vigorously promoting natural gas has become my country's energy policy. Natural gas encounters some special situations during transportation, such as passing through oceans, mountains, and deserts, making traditional pipeline transportation impossible. Special treatment is required to freeze natural gas into liquid before transportation. Cryogenic valves play an extremely important role in the safe and reliable operation of liquefied natural gas (LNG) plants.

[0003] Most of the cryogenic valves currently used in China are imported, which are expensive, have long production cycles, and have small diameters and low pressures, posing a huge risk to the country's energy construction and operation. Developing large-diameter, high-pressure cryogenic fixed ball valves has become a development trend, so it is necessary to propose a cryogenic fixed ball valve. Utility Model Content

[0004] The purpose of this invention is to provide a cryogenic fixed ball valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a cryogenic fixed ball valve, comprising a valve body, a fixed shaft disposed on the inner side of the valve body, a sliding bearing fixedly mounted on the outer side of the fixed shaft, a sealing ring disposed on the inner side of the valve body, a sealing ring two disposed on the inner side of the valve body, an upstream valve seat disposed at the upper end of the sealing ring two, a thrust washer disposed at the upper end of the fixed shaft, a ball disposed at the upper end of the thrust washer, an extended valve cover disposed at the upper end of the valve body, a valve stem disposed on the inner side of the extended valve cover, a sliding bearing two fixedly mounted on the outer side of the valve stem, and a sliding bearing two fixedly mounted on the inner side of the extended valve cover. A sliding bearing is fixedly installed on the extended valve cover. A sealing ring is fixedly installed on the lower end of the extended valve cover. A small ball is provided on the inner side of the valve stem. A spring is provided on the outer side of the small ball. A drip tray is fixedly installed on the outer side of the extended valve cover. A pressure plate is provided on the outer side of the valve stem. A pressure sleeve is provided on the lower end of the pressure plate. A pressure ring is provided on the lower end of the pressure sleeve. A packing assembly is provided on the lower end of the pressure ring. A packing pad is provided on the lower end of the packing assembly. A sealing ring is fixedly installed on the lower end of the packing pad. A bracket is fixedly installed on the upper end of the extended valve cover. A gearbox is fixedly installed on the upper end of the bracket. A downstream valve seat is provided on the inner side of the valve body.

[0006] Preferably, the ball is located outside the sliding bearing and the thrust washer, and the thrust washer is located between the ball and the fixed shaft.

[0007] Preferably, the upstream valve seat and the downstream valve seat are located on the same horizontal line, and both the first sealing ring and the second sealing ring are located between the valve body and the upstream valve seat.

[0008] Preferably, the valve stem extends inside the bracket and gearbox, and the valve stem is located at the center of the extended valve cover.

[0009] Preferably, the pressure sleeve is located between the pressure plate and the pressure ring, and the packing assembly is located between the pressure ring and the packing pad.

[0010] Preferably, the second sliding bearing is fixedly installed between the extended valve cover and the valve stem.

[0011] Preferably, the bracket is fixedly installed between the extended valve cover and the gearbox.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This cryogenic fixed ball valve mainly consists of a valve body, an extended valve cover, a ball, a valve stem, an upstream valve seat, and a downstream valve seat. The valve stem employs an anti-blowout structure, preventing jamming, seizing, and scratching of internal components during frequent valve operation in cryogenic conditions. The extended valve cover facilitates cold insulation, preventing the stuffing box from freezing and causing sealing failure. An elastically loaded pressure sleeve applied to the valve stem ensures long-term effective packing seal performance and extends service life. The use of spring-loaded sealing rings (sealing rings 1, 2, 3, and 4) guarantees excellent sealing performance in cryogenic environments.

[0014] 2. This cryogenic fixed ball valve features a one-piece valve body design, resulting in high strength and excellent sealing performance. The ball and spring design prevents the risk of static electricity, enhancing safety. The upstream and downstream valve seats automatically seal against the ball when the valve body burns out or is damaged, minimizing leakage between the valve seat and the ball. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the present invention.

[0016] Figure 2 This is a partial enlarged structural diagram of the present invention;

[0017] Figure 3 This is a second enlarged structural diagram of the present invention;

[0018] Figure 4This is a magnified structural diagram of the third part of this utility model.

[0019] The components are as follows: 1. Valve body; 2. Fixed shaft; 3. Sliding bearing one; 4. Sealing ring one; 5. Sealing ring two; 6. Upstream valve seat; 7. Thrust washer; 8. Ball; 9. Extended valve cover; 10. Valve stem; 11. Sliding bearing two; 12. Sliding bearing three; 13. Sealing ring three; 14. Small ball; 15. Spring; 16. Drip tray; 17. Pressure plate; 18. Pressure sleeve; 19. Pressure ring; 20. Packing assembly; 21. Packing pad; 22. Sealing ring four; 23. Bracket; 24. Gearbox; 25. Downstream valve seat. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides a technical solution: a cryogenic fixed ball valve, comprising a valve body 1, a fixed shaft 2 disposed on the inner side of the valve body 1, a sliding bearing 3 fixedly mounted on the outer side of the fixed shaft 2, a sealing ring 4 disposed on the inner side of the valve body 1, a second sealing ring 5 disposed on the inner side of the valve body 1, an upstream valve seat 6 disposed at the upper end of the second sealing ring 5, a thrust washer 7 disposed at the upper end of the fixed shaft 2, a ball 8 disposed at the upper end of the thrust washer 7, and an extended valve cover 9 disposed at the upper end of the valve body 1. The extended valve cover 9, by adopting an extended structure, facilitates cold preservation to prevent the stuffing box from freezing and causing sealing failure. A valve stem 10 disposed on the inner side of the extended valve cover 9, a sliding bearing 11 fixedly mounted on the outer side of the valve stem 10, and the extended valve cover 9... A sliding bearing 12 is fixedly installed on the inner side. A sealing ring 13 is fixedly installed on the lower end of the extended valve cover 9. A small ball 14 is provided on the inner side of the valve stem 10. A spring 15 is provided on the outer side of the small ball 14. A drip tray 16 is fixedly installed on the outer side of the extended valve cover 9. A pressure plate 17 is provided on the outer side of the valve stem 10. A pressure sleeve 18 is provided at the lower end of the pressure plate 17. A pressure ring 19 is provided at the lower end of the pressure sleeve 18. A packing group 20 is provided at the lower end of the pressure ring 19. A packing pad 21 is provided at the lower end of the packing group 20. A sealing ring 22 is fixedly installed on the lower end of the packing pad 21. A bracket 23 is fixedly installed on the upper end of the extended valve cover 9. A gearbox 24 is fixedly installed on the upper end of the bracket 23. A downstream valve seat 25 is provided on the inner side of the valve body 1.

[0022] Please see Figure 2-4In this embodiment, the ball 8 is located outside the sliding bearing 3 and the thrust washer 7. The thrust washer 7 is located between the ball 8 and the fixed shaft 2. The upstream valve seat 6 and the downstream valve seat 25 are located on the same horizontal line. The sealing ring 4 and the sealing ring 5 are both located between the valve body 1 and the upstream valve seat 6. The arrangement of the upstream valve seat 6 and the downstream valve seat 25 allows the upstream valve seat 6 and the downstream valve seat 25 to automatically press against the ball 8 when the valve body 1 is burned or damaged, minimizing the leakage between the valve seat 1 and the ball 8. The stem 10 extends inside the bracket 23 and gearbox 24. The valve stem 10 is located at the center of the extended valve cover 9. The pressure sleeve 18 is located between the pressure plate 17 and the pressure ring 19. The packing assembly 20 is located between the pressure ring 19 and the packing pad 21. By adding an elastic load to the pressure sleeve 18 outside the valve stem 10, the packing sealing performance can be ensured to be effective for a long time and the service life can be improved. The sliding bearing 11 is fixedly installed between the extended valve cover 9 and the valve stem 10. The bracket 23 is fixedly installed between the extended valve cover 9 and the gearbox 24.

[0023] Working principle: The main components include valve body 1, extended valve cover 9, ball 8, valve stem 10, upstream valve seat 6, and downstream valve seat 25. The integrated valve body 1 provides high strength and good sealing performance. The valve stem 10 features an anti-blowout structure, preventing jamming, seizing, and scratches in frequent valve operations under low-temperature conditions. The extended valve cover 9 facilitates cold insulation, preventing the stuffing box from freezing and causing sealing failure. The addition of an elastically loaded pressure sleeve 18 to the valve stem 10 ensures the packing is sealed. The sealing performance is long-lasting and extends service life. The sealing rings 1-4, 2-5, 3-13, and 4-22, which use spring energy storage rings, can ensure good sealing performance in low-temperature environments. The small ball 14 and spring 15 prevent the risk of static electricity and improve safety. The upstream valve seat 6 and downstream valve seat 25 automatically press against the ball 8 when the valve body 1 is burned or damaged, minimizing the leakage between the valve seat 1 and the ball 8.

[0024] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0025] The above description of the disclosed embodiments enables those skilled in the art to make 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. Therefore, the present invention is not 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 cryogenic fixed ball valve, comprising a valve body (1), characterized in that: A fixed shaft (2) is provided on the inner side of the valve body (1), and a sliding bearing (3) is fixedly installed on the outer side of the fixed shaft (2). A sealing ring (4) is provided on the inner side of the valve body (1), and a sealing ring (5) is provided on the inner side of the valve body (1). An upstream valve seat (6) is provided at the upper end of the sealing ring (5). A thrust washer (7) is provided at the upper end of the fixed shaft (2), and a ball (8) is provided at the upper end of the thrust washer (7). An extended valve cover (9) is provided at the upper end of the valve body (1). A valve stem (10) is provided on the inner side of the extended valve cover (9). A sliding bearing (11) is fixedly installed on the outer side of the valve stem (10). A sliding bearing (12) is fixedly installed on the inner side of the extended valve cover (9). A sealing ring (13) is fixedly installed at the lower end of the extended valve cover (9). The valve stem (10) has a small ball (14) on its inner side and a spring (15) on its outer side. The extended valve cover (9) has a drip tray (16) fixedly installed on its outer side. The valve stem (10) has a pressure plate (17) on its outer side. The pressure plate (17) has a pressure sleeve (18) at its lower end. The pressure sleeve (18) has a pressure ring (19) at its lower end. The pressure ring (19) has a packing group (20) at its lower end. The packing group (20) has a packing pad (21) at its lower end. The packing pad (21) has a sealing ring (22) fixedly installed at its lower end. The extended valve cover (9) has a bracket (23) fixedly installed at its upper end. The bracket (23) has a gearbox (24) fixedly installed at its upper end. The valve body (1) has a downstream valve seat (25) on its inner side.

2. The cryogenic fixed ball valve according to claim 1, characterized in that: The ball (8) is located outside the sliding bearing (3) and the thrust washer (7), which is located between the ball (8) and the fixed shaft (2).

3. The cryogenic fixed ball valve according to claim 1, characterized in that: The upstream valve seat (6) and the downstream valve seat (25) are located on the same horizontal line, and the sealing ring one (4) and the sealing ring two (5) are both located between the valve body (1) and the upstream valve seat (6).

4. The cryogenic fixed ball valve according to claim 1, characterized in that: The valve stem (10) extends inside the bracket (23) and gearbox (24), and the valve stem (10) is located at the center of the extended valve cover (9).

5. A cryogenic fixed ball valve according to claim 1, characterized in that: The pressure sleeve (18) is located between the pressure plate (17) and the pressure ring (19), and the packing assembly (20) is located between the pressure ring (19) and the packing pad (21).

6. A cryogenic fixed ball valve according to claim 1, characterized in that: The sliding bearing 2 (11) is fixedly installed between the extended valve cover (9) and the valve stem (10).

7. A cryogenic fixed ball valve according to claim 1, characterized in that: The bracket (23) is fixedly installed between the extended valve cover (9) and the gearbox (24).

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