C-shaped eccentric top-mounted metal sealing ball valve

Abstract

The utility model relates to the technical field of low-temperature valves, and discloses a C-shaped eccentric top-mounted metal sealing ball valve which comprises a valve body, an upper valve cover is arranged at the top end of the valve body, a rain shielding piece is fixedly connected to the periphery of the upper valve cover, and a metal valve seat is arranged in the valve body. A first spring energy storage sealing ring and a cylindrical spring are arranged on the outer side of the metal valve seat, a valve shaft is arranged in the upper valve deck, a ball core is arranged at the bottom end of the valve shaft, the periphery of the bottom end of the ball core is sleeved with a second rotating pad, a third guide sleeve is arranged at the bottom end of the ball core, and a first guide sleeve is arranged at the upper end of the ball core. A second guide sleeve is arranged on the periphery of the valve shaft, and the valve shaft is connected with the upper valve deck through the second guide sleeve. According to the utility model, more reliable leakage rate can be realized, the service life can be prolonged, valve seat pretightening force can be provided, metal valve seat sealing leakage caused by pressure change can be compensated, continuous pretightening force can be provided for the filler, and leakage can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of cryogenic valves, in particular to a C-type eccentric top-loading metal sealing ball valve. Background Art

[0002] At present, there are usually two structures of cryogenic ball valves for LNG pipelines. One is a cryogenic top-mounted floating ball valve or a cryogenic top-mounted fixed ball valve. The structural design of the fixed ball valve meets the requirements of API 6D, and it is necessary to clarify the specific structure of DBB / DIB / DIN-2. When the valves with this structure are in operation and use at LNG receiving stations, it is generally reported that there is internal leakage. The cryogenic ball valves at the outlet of the high-pressure pump of some receiving stations also have external leakage. Severe internal leakage makes it impossible to effectively isolate the downstream LNG gasification equipment, and the valve shut-off function fails, which interferes with the operation and maintenance of the equipment. When the valve leaks, a large amount of LNG is gasified, which can easily cause natural gas explosion, causing serious risks.

[0003] The other structure adopts a double-eccentric C-type structure, which enables the ball to progressively contact the sealing ring during the closing process of the valve, thereby greatly reducing the friction torque between the ball and the sealing ring of the traditional cryogenic ball valve; at the same time, it reduces the wear of the sealing ring, thereby extending the service life, especially in frequent operation occasions; since the C-type ball valve has no middle cavity, there is no backlog in the middle cavity, eliminating the risk of backlog in the middle cavity; however, this structure mostly uses PCTFE soft sealing rings, which are monopolized by imports and are very expensive, and the structure is fixed with a nut without pre-tightening force. When the valve seat deforms and fails, the sealing function is lost, so in actual applications, the effect is very unsatisfactory; if a hard sealing structure is used, material costs can be saved and leakage caused by deformation of the soft sealing valve seat can be eliminated. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a C-type eccentric top-mounted metal sealing ball valve, which aims to improve the problem in the prior art that when the valve seat is deformed and fails, the sealing function is lost, so the effect is very unsatisfactory in actual application.

[0005] In order to achieve the above-mentioned objectives, the utility model adopts the following technical scheme: a C-type eccentric top-mounted metal-sealed ball valve, comprising a valve body, a stuffing box mechanism is arranged on the upper side of the valve body, an upper valve cover is arranged on the top of the valve body, a rain shield is fixedly connected to the outer periphery of the upper valve cover, a metal valve seat is arranged inside the valve body, a spring energy storage sealing ring and a cylindrical spring are arranged on the outer side of the metal valve seat, the metal valve seat is connected to the valve body through the spring energy storage sealing ring and the cylindrical spring, a valve shaft is arranged inside the upper valve cover, a ball core is arranged at the bottom end of the valve shaft, a rotating pad is sleeved on the outer periphery of the top end of the ball core, a rotating pad is sleeved on the outer periphery of the bottom end of the ball core, a guide sleeve three is arranged on the bottom end of the ball core, a guide sleeve one is arranged on the upper end of the ball core, a guide sleeve two is arranged on the outer periphery of the valve shaft, and the valve shaft is connected to the upper valve cover through the guide sleeve two.

[0006] As a further description of the above technical solution:

[0007] The stuffing box mechanism includes a spring energy storage sealing ring 2, which is arranged inside the upper valve cover. A sealing sleeve is arranged at the top of the spring energy storage sealing ring 2, a stuffing pad is arranged at the top of the sealing sleeve, a graphite filler is arranged on the top of the stuffing pad, and a stuffing spacer ring is arranged between the double-layer graphite filler.

[0008] As a further description of the above technical solution:

[0009] The upper valve cover is penetrated by a valve cover bolt, the bottom end of the valve cover bolt penetrates into the valve body and is threadedly connected to the valve body, and the top end of the valve cover bolt is threadedly connected to a valve cover nut.

[0010] As a further description of the above technical solution:

[0011] The valve body and the ball core adopt a double eccentric structure design, that is, the center line of the valve shaft is eccentric to the metal valve seat, and the center line of the valve body is eccentric to the center line of the valve shaft.

[0012] As a further description of the above technical solution:

[0013] The ball core adopts a C-type full-channel flow channel, the ball core is fixedly connected to the valve shaft, and the outer diameter area of ​​the spring energy storage sealing ring is larger than the metal valve seat sealing line.

[0014] As a further description of the above technical solution:

[0015] A packing sleeve is arranged on the upper side of the graphite packing, a dust sleeve is arranged on the inner side of the packing sleeve, a packing cover is arranged on the upper side of the packing sleeve, a disc spring sleeve is arranged on the upper side of the packing cover, a disc spring pad is abutted between the disc spring sleeve and the packing cover, a disc spring inner sleeve is arranged inside the disc spring sleeve, a disc spring part is arranged between the disc spring sleeve and the disc spring inner sleeve, a packing bolt passes through the upper side of the disc spring sleeve, the bottom end of the packing bolt passes through the disc spring inner sleeve and is arranged in the upper valve cover, and a packing nut is threadedly connected to the top end of the packing bolt.

[0016] As a further description of the above technical solution:

[0017] A spring energy storage sealing ring three and a metal winding gasket are arranged at the bottom end of the upper valve cover, and the upper valve cover is connected to the valve body through the spring energy storage sealing ring three and the metal winding gasket.

[0018] As a further description of the above technical solution:

[0019] The upper periphery of the upper valve cover is provided with evenly distributed moon pressure grooves.

[0020] As a further description of the above technical solution:

[0021] The bottom end of the valve body is connected with a drain valve.

[0022] The utility model has the following beneficial effects:

[0023] In the utility model, by adopting an eccentric structural design, a more reliable leakage rate can be achieved and the service life can be extended. A cylindrical spring is installed between the metal valve seat and the valve body to provide a valve seat pre-tightening force. A spring energy storage sealing ring is installed between the metal valve seat and the valve body to achieve sealing between the metal valve seat and the valve body and compensate for metal valve seat sealing leakage caused by pressure changes. The stuffing box clamping method adopts a dynamic load stuffing clamping structure to give the stuffing a continuous pre-tightening force to prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front cross-sectional view of a C-type eccentric top-loading metal sealing ball valve proposed by the utility model;

[0025] Figure 2 This is a schematic diagram of the eccentric structure of the valve cavity of a C-type eccentric top-loading metal sealing ball valve proposed by the utility model;

[0026] Figure 3 This is a schematic diagram of the metal valve seat structure of a C-type eccentric top-entry metal sealing ball valve proposed by the utility model;

[0027] Figure 4This is a schematic diagram of the sealing structure of the upper valve cover of a C-type eccentric top-entry metal sealing ball valve proposed by the utility model;

[0028] Figure 5 This is a schematic diagram of the moon pressure groove on the upper valve cover of a C-type eccentric top-entry metal sealing ball valve proposed by the utility model;

[0029] Figure 6 This is a schematic diagram of the stuffing box structure of a C-type eccentric top-loading metal sealing ball valve proposed by the utility model;

[0030] Figure 7 The utility model discloses a schematic diagram of a dynamic load packing structure of a C-type eccentric top-entry metal sealing ball valve.

[0031] Legend:

[0032] 1. Valve body; 2. Metal valve seat; 3. Ball core; 4. Spring energy storage seal ring 1; 5. Cylindrical spring; 6. Rotating gasket 1; 7. Guide sleeve 1; 8. Upper valve cover; 9. Valve shaft; 10. Guide sleeve 2; 11. Stuffing box mechanism; 1101. Spring energy storage seal ring 2; 1102. Sealing sleeve; 1103. Stuffing pad; 1104. Stuffing spacer ring; 1105. Graphite packing; 16. Stuffing sleeve; 17. Stuffing gland; 18. Dust cover; 19. Stuffing bolt; 20. Stuffing nut; 21. Disc spring outer sleeve; 22. Disc spring inner sleeve; 23. Disc spring piece; 24. Disc spring gasket; 25. Rain shield; 26. Valve cover bolt; 27. Valve cover nut; 28. Metal spiral wound gasket; 29. ​​Spring energy storage seal ring 3; 30. Rotating gasket 2; 31. Guide sleeve 3; 32. Drain valve; 33. Moon pressure groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Reference Figure 1 , Figure 3 and Figure 4The utility model provides an embodiment: a C-type eccentric top-mounted metal sealing ball valve, comprising a valve body 1, a stuffing box mechanism 11 is arranged on the upper side of the valve body 1, an upper valve cover 8 is arranged on the top of the valve body 1, a rain shield 25 is fixedly connected to the outer periphery of the upper valve cover 8, a metal valve seat 2 is arranged inside the valve body 1, a spring energy storage sealing ring 4 and a cylindrical spring 5 are arranged on the outer side of the metal valve seat 2, the metal valve seat 2 is connected to the valve body 1 through the spring energy storage sealing ring 4 and the cylindrical spring 5, a valve shaft 9 is arranged inside the upper valve cover 8, a ball core 3 is arranged at the bottom end of the valve shaft 9, and a rotating pad is sleeved on the outer periphery of the top of the ball core 3 16, a rotating pad 2 30 is provided on the outer periphery of the bottom end of the ball core 3, a guide sleeve 3 31 is provided on the bottom end of the ball core 3, a guide sleeve 1 7 is provided on the upper end of the ball core 3, a guide sleeve 2 10 is provided on the outer periphery of the valve shaft 9, the valve shaft 9 is connected to the upper valve cover 8 through the guide sleeve 2 10, the ball core 3 adopts a C-type full-channel flow channel, the ball core 3 is fixedly connected to the valve shaft 9, the outer diameter area of ​​the spring energy storage seal ring 1 4 is larger than the sealing line of the metal valve seat 2; a spring energy storage seal ring 3 29 and a metal winding gasket 28 are provided on the bottom end of the upper valve cover 8, and the upper valve cover 8 is connected to the valve body 1 through the spring energy storage seal ring 3 29 and the metal winding gasket 28;

[0035] Specifically, by adopting an eccentric structural design, the position seal of an ordinary low-temperature O-type ball valve can be transformed into a torque continuous seal, thereby achieving a more reliable leakage rate. At the same time, when the valve is opened, the ball core 3 can quickly detach from the valve seat. Since there is no wear between them, the service life can be extended. The valve body 1 and the upper valve cover 8 are designed with a top-mounted structure to achieve the effect of online rapid maintenance. The upper valve cover 8 is equipped with a rain shield 25 to prevent raindrops from dripping into the middle flange bolts and causing bolt corrosion. The guide sleeve adopts a three-section support structure design, which is the lower part of the ball core 3, the upper part of the ball core 3, and the upper part of the upper valve cover 8, so as to simultaneously support the valve shaft 9. The middle flange seal of the upper valve cover 8 adopts a longitudinal spring energy storage seal. The combined sealing structure of the sealing ring 3 29 and the metal winding gasket 28 makes the sealing effect better; a cylindrical spring 5 is installed between the metal valve seat 2 and the valve body 1 to provide valve seat preload; a spring energy storage sealing ring 4 is installed between the metal valve seat 2 and the valve body 1 to achieve sealing between the metal valve seat 2 and the valve body 1 and compensate for the sealing leakage of the metal valve seat 2 caused by pressure changes; and the stuffing box clamping method adopts a dynamic load stuffing clamping structure to give the stuffing a continuous preload to prevent leakage, and the stacked disc spring 23 and the inner and outer guide sleeves can play a role in fixing and rainproofing; the ball core 3 adopts a C-type full-channel structure, without a cavity, and no pressure relief discharge is required; the valve sealing structure adopts a pure metal seal, which is essentially fireproof and anti-static.

[0036] Reference Figure 1 , Figure 6 and Figure 7The stuffing box mechanism 11 includes a spring energy storage seal ring 1101, which is arranged inside the upper valve cover 8. A sealing sleeve 1102 is arranged on the top of the spring energy storage seal ring 1101, and a packing pad 1103 is arranged on the top of the sealing sleeve 1102. A graphite packing 1105 is arranged on the top of the packing pad 1103, and a packing spacer ring 1104 is arranged between the double-layer graphite packing 1105; a packing sleeve 16 is arranged on the upper side of the graphite packing 1105, and an anti- Dust sleeve 18, packing gland 17 is arranged on the upper side of packing gland 16, disc spring outer sleeve 21 is arranged on the upper side of packing gland 17, disc spring pad 24 is abutted between disc spring outer sleeve 21 and packing gland 17, disc spring inner sleeve 22 is arranged inside disc spring outer sleeve 21, disc spring member 23 is arranged between disc spring outer sleeve 21 and disc spring inner sleeve 22, packing bolt 19 is penetrated on the upper side of disc spring outer sleeve 21, the bottom end of packing bolt 19 penetrates disc spring inner sleeve 22 and is arranged in upper valve cover 8, and packing nut 20 is threadedly connected with the top end of packing bolt 19;

[0037] Specifically, the sealing sleeve 1102 and the packing pad 1103 installed on the spring energy storage sealing ring 1101 can increase the sealing performance, and the two layers of graphite packing 1105 and the packing spacer ring 1104 between the graphite packings 1105 on both sides can prevent the leakage of LNG medium; the dynamic load structure formed by the packing sleeve 16 and the packing cover 17 can provide continuous clamping force on the packing, allowing the valve to be used for 50,000 switching cycles without adjusting or replacing the packing, and the stacked disc spring parts 23, disc spring outer sleeve 21 and disc spring inner sleeve 22 can play a role in fixing and rainproofing, and can be fixed with the packing bolts 19 and packing nuts 20.

[0038] Reference Figure 1 and Figure 5 The upper valve cover 8 is penetrated by a valve cover bolt 26, the bottom end of the valve cover bolt 26 penetrates into the valve body 1 and is threadedly connected to the valve body 1, and the top end of the valve cover bolt 26 is threadedly connected to a valve cover nut 27; the upper periphery of the upper valve cover 8 is provided with evenly distributed moon pressure grooves 33; the bottom end of the valve body 1 is connected to a drain valve 32;

[0039] Specifically, by providing the valve cover bolts 26 and the valve cover nuts 27, the upper valve cover 8 and the valve body 1 can be pressed and fitted together to ensure the stability of the upper valve cover 8 and the valve body 1; by providing the moon pressure groove 33, the heat dissipation effect can be increased to prevent the stuffing box from freezing; by providing the drain valve 32, the stains inside the valve body 1 can be discharged and cleaned.

[0040] Reference Figure 1 and Figure 2 The valve body 1 and the ball core 3 adopt a double eccentric structure design, that is, the center line of the valve shaft 9 is eccentric to the metal valve seat 2, and the center line of the valve body 1 is eccentric to the center line of the valve shaft 9;

[0041] Specifically, the center line of the valve shaft 9 forms eccentricity one with the metal valve seat 2 for sealing, and the center line of the valve body 1 forms eccentricity two with the center line of the valve shaft 9, so that the valve shaft 9 can rotate clockwise and counterclockwise, and then drive the ball core 3 to rotate clockwise and counterclockwise to realize the opening and closing of the valve.

[0042] Working principle: By adopting an eccentric structural design, the position seal of an ordinary low-temperature O-type ball valve can be transformed into a torque continuous seal to achieve a more reliable leakage rate. At the same time, when the valve is opened, the ball core 3 can quickly detach from the valve seat. Since there is no wear between them, the service life can be extended; the valve body 1 and the upper valve cover 8 are designed with a top-mounted structure to achieve the effect of online rapid maintenance; and the upper valve cover 8 is equipped with a rain shield 25, which can prevent raindrops from dripping into the middle flange bolts and causing bolt corrosion; the guide sleeve adopts a three-section support structure design, which is the lower part of the ball core 3, the upper part of the ball core 3, and the upper part of the upper valve cover 8, to achieve simultaneous support of the valve shaft 9; at the same time, the metal valve seat 2 is made of welded hard alloy and can be replaced online; a cylindrical spring 5 is installed between the metal valve seat 2 and the valve body 1 to provide valve seat preload; a spring energy storage seal 4 is installed between the metal valve seat 2 and the valve body 1 to achieve sealing between the metal valve seat 2 and the valve body 1 and compensate for the sealing leakage of the metal valve seat 2 caused by pressure changes; and the stuffing box clamping method adopts a dynamic load stuffing clamping structure to give the stuffing a continuous preload to prevent leakage, and the stacked disc spring 23 and the inner and outer guide sleeves can play a role in fixing and rainproofing; the ball core 3 adopts a C-type full-channel structure with no cavity and no need for pressure relief and discharge; the valve sealing structure adopts pure metal sealing, which is essentially fireproof and anti-static.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A C-type eccentric top-entry metal-sealed ball valve, comprising a valve body (1), characterized in that: A stuffing box mechanism (11) is arranged on the upper side of the valve body (1), an upper valve cover (8) is arranged on the top of the valve body (1), a rain shield (25) is fixedly connected to the outer periphery of the upper valve cover (8), a metal valve seat (2) is arranged inside the valve body (1), a spring energy storage seal ring (4) and a cylindrical spring (5) are arranged on the outer side of the metal valve seat (2), the metal valve seat (2) is connected to the valve body (1) via the spring energy storage seal ring (4) and the cylindrical spring (5), and the upper valve cover (8) is fixedly connected to the outer periphery of the upper valve cover (8). ) is provided with a valve shaft (9) inside, a ball core (3) is provided at the bottom end of the valve shaft (9), a rotating pad (6) is provided on the outer periphery of the top end of the ball core (3), a rotating pad (30) is provided on the outer periphery of the bottom end of the ball core (3), a guide sleeve (31) is provided at the bottom end of the ball core (3), a guide sleeve (7) is provided at the upper end of the ball core (3), a guide sleeve (10) is provided on the outer periphery of the valve shaft (9), and the valve shaft (9) is connected to the upper valve cover (8) through the guide sleeve (10).

2. A C-type eccentric top entry metal sealing ball valve according to claim 1, characterized in that: The stuffing box mechanism (11) comprises a second spring energy storage sealing ring (1101), wherein the second spring energy storage sealing ring (1101) is arranged inside the upper valve cover (8), a sealing sleeve (1102) is arranged at the top end of the second spring energy storage sealing ring (1101), a stuffing pad (1103) is arranged at the top end of the sealing sleeve (1102), a graphite stuffing (1105) is arranged on the top of the stuffing pad (1103), and a stuffing spacer ring (1104) is arranged between the double layers of graphite stuffing (1105).

3. A C-type eccentric top entry metal sealing ball valve according to claim 1, characterized in that: The upper valve cover (8) is penetrated by a valve cover bolt (26), the bottom end of the valve cover bolt (26) penetrates into the valve body (1) and is threadedly connected to the valve body (1), and the top end of the valve cover bolt (26) is threadedly connected to a valve cover nut (27).

4. A C-type eccentric top entry metal sealing ball valve according to claim 1, characterized in that: The valve body (1) and the ball core (3) adopt a double eccentric structural design, that is, the center line of the valve shaft (9) is eccentric to the metal valve seat (2), and the center line of the valve body (1) is eccentric to the center line of the valve shaft (9).

5. The C-type eccentric top entry metal sealing ball valve according to claim 1, characterized in that: The ball core (3) adopts a C-type full-channel flow channel, the ball core (3) is fixedly connected to the valve shaft (9), and the outer diameter area of ​​the spring energy storage sealing ring (4) is larger than the sealing line of the metal valve seat (2).

6. A C-type eccentric top entry metal sealing ball valve according to claim 2, characterized in that: A packing sleeve (16) is arranged on the upper side of the graphite packing (1105), a dust cover (18) is arranged on the inner side of the packing sleeve (16), a packing cover (17) is arranged on the upper side of the packing sleeve (16), a disc spring sleeve (21) is arranged on the upper side of the packing cover (17), a disc spring pad (24) is abutted between the disc spring sleeve (21) and the packing cover (17), a disc spring inner sleeve (22) is arranged inside the disc spring sleeve (21), a disc spring member (23) is arranged between the disc spring sleeve (21) and the disc spring inner sleeve (22), a packing bolt (19) passes through the upper side of the disc spring sleeve (21), the bottom end of the packing bolt (19) passes through the disc spring inner sleeve (22) and is arranged in the upper valve cover (8), and the top end of the packing bolt (19) is threadedly connected with a packing nut (20).

7. A C-type eccentric top entry metal sealing ball valve according to claim 1, characterized in that: A spring energy storage sealing ring three (29) and a metal winding gasket (28) are provided at the bottom end of the upper valve cover (8), and the upper valve cover (8) is connected to the valve body (1) via the spring energy storage sealing ring three (29) and the metal winding gasket (28).

8. The C-type eccentric top entry metal sealing ball valve according to claim 1, characterized in that: The upper outer periphery of the upper valve cover (8) is provided with evenly distributed moon pressure grooves (33).

9. A C-type eccentric top entry metal sealing ball valve according to claim 1, characterized in that: The bottom end of the valve body (1) is connected to a sewage discharge valve (32).

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