CN212297700U - Sealing device for low-temperature ball valve - Google Patents
Sealing device for low-temperature ball valve Download PDFInfo
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- CN212297700U CN212297700U CN202020553550.7U CN202020553550U CN212297700U CN 212297700 U CN212297700 U CN 212297700U CN 202020553550 U CN202020553550 U CN 202020553550U CN 212297700 U CN212297700 U CN 212297700U
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Abstract
The utility model provides a sealing device for low temperature ball valve, including valve body, metal valve seat and spheroid, annular metal support ring and annular first lip formula sealing washer are installed in the space between valve body and the metal valve seat, first lip formula sealing washer includes two first lip limits, be annular groove between the first lip limit, the outside of first lip formula sealing washer with the valve body is supported and is pressed, the inboard of first lip formula sealing washer with the metal valve seat is supported and is pressed; one end of the metal support ring is a protruding head, the other end of the metal support ring is a group of round holes, and the protruding head is pressed in the annular groove of the first lip type sealing ring; and a thrust spring is arranged in the round hole of the metal support ring, and the other end of the thrust spring is abutted against the valve body. The utility model is used for sealing device of low temperature ball valve has fine low temperature sealing performance.
Description
Technical Field
The utility model belongs to the technical field of the sealed disk seat of low temperature ball valve, concretely relates to a sealing device for low temperature ball valve.
Background
A fixed ball valve for cryogenic liquids such as liquid oxygen, liquid nitrogen, Liquefied Natural Gas (LNG) or other cryogenic media, a conventional seal seat, uses a standard first Lip seal ring of a teflon-embedded metal spring, called Lip seal. To prevent leakage between the metal valve seat and the valve body. This structure develops leakage when the temperature drops to-75 deg.c or lower. The sealing requirements become more and more difficult, so that the technical standards established at home and abroad also allow leakage at a low temperature of-196 ℃. The bubble level "zero" leakage requirement is not met.
Fig. 1 is a conventional sealing structure of a cryogenic ball valve. The valve comprises a valve body 11, a first lip type sealing ring 12, a spring 13 in the first lip type sealing ring, a metal valve seat 14, a PTFE spherical sealing ring 15, a back thrust spring 16 and a ball 17.
The leakage is caused by the shrinkage and hardening of the tetrafluoro plastic caused by the difference of thermal expansion coefficients of the tetrafluoro plastic sealing material and the metal valve seat at low temperature. The spring 13 in the first lip seal, which is not sufficiently resilient to overcome its deformation, is the root cause of the leakage, which is the contact force necessary to maintain contact with the valve body 11.
SUMMERY OF THE UTILITY MODEL
To the problem that current low temperature ball valve probably takes place to leak under the low temperature condition, the utility model provides a sealing device for low temperature ball valve has fine low temperature sealing performance.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a sealing device for a low-temperature ball valve comprises a valve body, a metal valve seat and a ball body, wherein an annular metal support ring and an annular first lip type sealing ring are arranged in a space between the valve body and the metal valve seat, the first lip type sealing ring comprises two first lip edges, an annular groove is formed between the first lip edges, the outer side of the first lip type sealing ring is pressed against the valve body, and the inner side of the first lip type sealing ring is pressed against the metal valve seat; one end of the metal support ring is a protruding head, the other end of the metal support ring is a group of round holes, and the protruding head is pressed in the annular groove of the first lip type sealing ring; and a thrust spring is arranged in the round hole of the metal support ring, and the other end of the thrust spring is abutted against the valve body.
The utility model provides a sealing device for low temperature ball valve has fine low temperature leakproofness. The utility model discloses a first lip limit in both sides of first lip formula sealing washer is promoted by an annular metal support ring, under medium pressure and a set of thrust spring's promotion, wedge effect through the offset pressure production in metal support ring and the first lip limit in first lip formula sealing washer, greatly increased the contact force between first lip limit and valve body and the metal valve seat, and the shrink in the first lip limit in the cyclic annular first lip formula sealing washer outside at low temperature, thereby overcome the deformation in first lip limit at low temperature, still keep sufficient contact force, prevent the leakage of low temperature medium.
The utility model discloses further set up to, still include another first lip formula sealing washer and metal support ring, two be equipped with the baffle between the first lip formula sealing washer, with the baffle is the symmetry line, two first lip formula sealing washer and two the metal support ring symmetry sets up dorsad.
The utility model discloses further set up to, the valve body with the clamp plate still is equipped with in the space between the metal disk seat, the outside of first lip formula sealing washer is connected with annular first toe and follows, be equipped with a breach on the valve body, first toe is with pressing on the breach, the clamp plate passes through the fix with screw on the valve body, first lip formula sealing washer support press in the clamp plate with on the valve body, the clamp plate with second thrust spring is equipped with between the metal disk seat, the embedding of second thrust spring one end metal disk seat, the other end support press in on the clamp plate. The first toe heel is pressed by the pressure plate to provide a secondary plane seal, thereby further preventing the leakage of the low-temperature medium.
The utility model discloses further set up to, the metal disk seat with the embedding has annular seal circle on the face that the spheroid contacted.
The utility model is further provided with a pressing plate arranged in the space between the valve body and the metal valve seat, the outer side of the first lip type sealing ring is connected with a first toe heel, the valve body is provided with a gap, the first toe is pressed on the notch, the first lip type sealing ring is pressed on the pressure plate and the valve body, the other side of the pressure plate is provided with four metal rings, the four metal rings form a discontinuous circle, the inner wall of the valve body is provided with an annular groove, the metal ring is embedded into the annular groove of the valve body, the metal ring is provided with a screw hole, the pressure plate is pressed on the valve body by a screw which passes through the screw hole of the metal ring, and a second thrust spring is arranged between the pressing plate and the metal valve seat, one end of the second thrust spring is embedded into the metal valve seat, and the other end of the second thrust spring is pressed on the pressing plate in a propping manner.
The utility model discloses set up further to, the metal valve seat with be equipped with second lip formula sealing washer and clamp ring in the space between the spheroid, second lip formula sealing washer includes two second lip limits, be annular groove between the second lip limit, one of them the second lip limit supports and leans on the metal valve seat, another the second lip limit supports and leans on the spheroid, it follows to be connected with an annular second toe on the second lip formula sealing washer, the clamp ring is pressed the second toe of second lip formula sealing washer is with up and is fixed through housing screw on the metal valve seat. The second lip type sealing ring is pushed by medium force and U-shaped metal spring force to provide a dynamic sealing structure, meanwhile, the second toe heel is pressed on the metal valve seat to provide a secondary plane sealing structure for the ball sealing end of the metal valve seat, and leakage of the medium is thoroughly blocked.
The utility model discloses further set up as, open-ended U-shaped metal spring is equipped with in the annular groove of second lip formula sealing washer.
The utility model discloses further set up as, open annular gap on the valve body between first toe heel and the first lip limit, annular gap is embedded to have the third lip formula sealing washer, the third lip formula sealing washer includes two third lip limits, be the annular groove between the third lip limit, the annular groove of third lip formula sealing washer is equipped with U-shaped metal spring in; one of the third lip edges abuts against the valve body and the other third lip edge abuts against the first toe heel. The utility model discloses to the occasion that has the special sealing requirement, like the sealed requirement of shell standard at high pressure, the experimental zero leakage of high low temperature cycle, further provide third lip formula sealing washer, arrange the front end that first toe was followed in third lip formula sealing washer, adopt the second grade to seal on the plane seal face, third lip formula plane seal is lip formula medium dynamic seal, and first toe is followed to compress tightly for plane static seal, blocks low temperature medium leakage.
The utility model discloses further set up to, with protruding head is connected metal support ring's the outside is the excircle, protruding head with the fillet is fallen to the excircle, protruding head with the annular groove of first lip formula sealing washer contacts, the excircle with first lip limit tip contacts.
The utility model discloses further set up to, the annular groove of first lip formula sealing washer is the oblique cylinder of taper.
The utility model discloses further set up to, the material of first lip formula sealing washer is PTFE plastics, PCTFE plastics or polyimide etc..
To sum up, the utility model is used for the sealing device of low temperature ball valve has fine low temperature sealing performance.
Drawings
FIG. 1 is a schematic view of a conventional sealing structure of a low temperature ball valve in the background art of the present invention;
fig. 2 is a schematic sectional view of a part of a sealing device of the low temperature ball valve in the embodiment 1 of the present invention;
fig. 3 is a schematic sectional view of a part of a sealing device of the low-temperature ball valve in the embodiment 2 of the present invention;
fig. 4 is a schematic sectional view of a part of a sealing device of the low temperature ball valve in the embodiment 3 of the present invention;
fig. 5 is a schematic sectional view of a part of a sealing device of the low temperature ball valve in the embodiment 4 of the present invention;
fig. 6 is a schematic sectional view of a part of the sealing device of the low temperature ball valve in the embodiment 5 of the present invention.
In fig. 2, 21, a valve body; 22. a metal support ring; 23. a first lip seal; 24. a metal valve seat; 25. an annular seal ring; 26. a thrust spring; 27. a sphere.
In fig. 3, 31, valve body; 32. a metal support ring; 33. a first lip seal; 34. a metal valve seat; 35. an annular seal ring; 36. a thrust spring; 37. a sphere; 38. a separator.
In fig. 4, 41, valve body; 42. a metal support ring; 43. a first lip seal; 44. a metal valve seat; 45. an annular seal ring; 46. a thrust spring; 47. a sphere. 48. A screw; 49. pressing a plate; 410. A second thrust spring; 411. the first toe and the heel.
In fig. 5, 51, valve body; 52. a metal support ring; 53. a first lip seal; 54. a metal valve seat; 55. a second lip seal ring; 56. a thrust spring; 57. a sphere; 58. a screw; 59. pressing a plate; 510. a second thrust spring; 511. a metal ring; 512. a compression ring; 513. a compression screw; 514. a U-shaped metal spring; 515. a first toe; 516. the second toe.
In fig. 6, 61, valve body; 62. a metal support ring; 63. a first lip seal; 64. a metal valve seat; 65. a second lip seal ring; 66. a thrust spring; 67. a sphere; 68. a screw; 69. pressing a plate; 610. a second thrust spring; 611. a metal ring; 612. a compression ring; 613. a compression screw; 614. a U-shaped metal spring; 615. a first toe; 616. a second toe; 617. a third lip seal ring; 618. A U-shaped metal spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
A sealing device for a low-temperature ball valve is disclosed, referring to fig. 2, and comprises a valve body 21, a metal valve seat 24 and a ball body 27, wherein an annular metal support ring 22 and an annular first lip type sealing ring 23 are arranged in a space between the valve body 21 and the metal valve seat 24, the first lip type sealing ring 23 comprises two first lip edges, an annular groove is formed between the first lip edges, the outer side of the first lip type sealing ring 23 is pressed against the valve body 21, and the inner side of the first lip type sealing ring 23 is pressed against the metal valve seat 24. One end of the metal support ring 22 is a protruding head, and the other end of the metal support ring 22 is a set of round holes, and the protruding head is pressed against the annular groove of the first lip type seal ring 23. A thrust spring 26 is arranged in a group of round holes of the metal support ring 22, and the other end of the thrust spring 26 is abutted against the valve body 21.
The thrust spring 26 pushes the metal support ring 22 towards the annular first lip seal 23 providing an initial sealing force. An annular metal valve seat 24 is fitted at its head with an annular sealing ring 25 made of PTFE or PCTFE, the annular sealing ring 25 being pressed against the ball 27. Under the action of medium force, a single-piston effect sealing structure with a one-way sealing function at the inlet end of the ball valve is constructed.
Example 2
A sealing device for a low-temperature ball valve is a sealing structure with a double-piston effect, and comprises a valve body 31, a metal valve seat 34 and a ball body 37, wherein an annular metal supporting ring 32 and an annular first lip type sealing ring 33 are arranged in a space between the valve body 31 and the metal valve seat 34, the first lip type sealing ring 33 comprises two first lip edges, an annular groove is formed between the first lip edges, the outer side of the first lip type sealing ring 33 is abutted against the valve body 31, and the inner side of the first lip type sealing ring 33 is abutted against the metal valve seat 34. One end of the metal support ring 32 is a protruding head, and the other end of the metal support ring 32 is a set of round holes, and the protruding head is pressed against the annular groove of the first lip seal 33. A thrust spring 36 is arranged in a group of round holes of the metal support ring 32, the other end of the thrust spring 36 is abutted against the valve body 31, and an annular sealing ring 35 is embedded in the surface of the metal valve seat 34, which is in contact with a ball 37. In addition, a first lip type sealing ring 33 and a metal supporting ring 32 are added, a partition plate 38 is arranged between the two first lip type sealing rings 33, the partition plate 38 is taken as a symmetry line, and the two first lip type sealing rings 33 and the two metal supporting rings 32 are symmetrically arranged. Under the push of medium pressure, a sealing structure with the function of bidirectional sealing, namely the double-piston effect, is constructed.
Compared with the prior art, the utility model discloses embodiment 1 and embodiment 2's characteristics lie in the first lip limit in both sides of first lip sealing washer and are promoted by an annular metal support ring, under medium pressure and a set of thrust spring's promotion, through the wedge effect that the counterbalance pressure of the first lip limit of metal support ring and first lip sealing washer produced, greatly increased the contact force between first lip limit and valve body and the metal valve seat, and restrict the shrink of the first lip limit in the cyclic annular first lip sealing washer outside at low temperature, thereby overcome the deformation in first lip limit at low temperature, still keep sufficient contact force, prevent the leakage of low temperature medium.
Example 3
A sealing device for a low-temperature ball valve is a two-stage sealing structure and comprises a first lip type sealing ring 43 with a first toe heel 411, and the two-stage sealing structure provides an axial sealing and a plane sealing. Referring to fig. 4, the sealing system comprises a valve body 41, a ball 47, a metal valve seat 44, a first lip type seal 43 with a first toe-heel 411 positioned in an annular cavity of the valve body 41 and the metal valve seat 44, a metal support ring 42, a protruding head part abutting against an annular groove of the first lip type seal 43 with the first toe-heel 411, and a group of thrust springs 46 at the back for pushing, wherein the outer side of the first lip edge tightly pushes against an inner cylindrical surface of the valve body 41, a gap is arranged on the valve body 41, the first toe-heel 411 presses against the gap, the first lip type seal 43 with the first toe-heel 411 is pressed by a pressure plate 49, the pressure plate 49 is pressed on the valve body 41 by a screw 48, the front end of the metal valve seat 44 is embedded with a PTFE annular seal 45, and a second thrust spring 410 pushes the metal valve seat 44 to make the annular seal 45 push against the ball 47, thereby forming a single piston effect sealing system of a two-.
Compared with the prior art, the embodiment 3 is characterized in that the annular first toe-heel 411 of the first lip type seal 43 is pressed by the pressing plate 49, the outer first lip and the first toe-heel 411 are tightly contacted with the valve body 41, a two-stage static sealing function of axial sealing and plane sealing is provided, the leakage of medium from one side of the valve body 41 at low temperature is effectively prevented, the inner first lip is contacted with the metal valve seat 44 to provide a semi-dynamic axial sealing, and the PTFE annular seal 45 embedded at the head of the metal valve seat 44 is contacted with the ball 47 to provide a dynamic spherical sealing. Under the combined action of medium force and spring force, the metal support ring 42 generates a wedge effect by the contact of the metal support ring 42 with the first lip edge on the inner side and the outer side of the annular groove of the first lip type seal ring 43 with the first toe-heel 411, so that the contact force between the first lip edge and the valve body 41 and the metal valve seat 44 is greatly increased, and the first toe-heel 411 and the valve body 41 are fixed by the pressing plate 49, so that a reliable static seal is obtained, and the leakage of low-temperature medium is prevented.
Example 4
A sealing device for a low-temperature ball valve, referring to fig. 5, comprises a valve body 51, a metal valve seat 54 and a ball body 57, wherein an annular metal support ring 52 and an annular first lip type sealing ring 53 are arranged in a space between the valve body 51 and the metal valve seat 54, the first lip type sealing ring 53 comprises two first lip sides, an annular groove is formed between the first lip sides, the outer side of the first lip type sealing ring 53 is pressed against the valve body 51, and the inner side of the first lip type sealing ring 53 is pressed against the metal valve seat 54; one end of the metal support ring 52 is a protruding head, and the other end of the metal support ring 52 has a set of round holes, and the protruding head is pressed against the annular groove of the first lip seal 53. A thrust spring 56 is arranged in a group of round holes of the metal support ring 52, and the other end of the thrust spring 56 is abutted against the valve body 51. A pressure plate 59 is further arranged in the space between the valve body 51 and the metal valve seat 54, a first toe heel 515 is connected to the outer side of the first lip type sealing ring 53, a notch is formed in the valve body 51, the first toe heel 515 is pressed on the notch, the first lip type sealing ring 53 abuts against the pressure plate 59, a four-opening metal ring 511 is arranged on the other side of the pressure plate 59, the four metal rings 511 form a discontinuous circle, an annular groove is formed in the inner wall of the valve body 51, the metal ring 511 is embedded into the annular groove of the valve body 51, a screw hole is formed in the metal ring 511, the pressure plate 59 is pressed on the valve body 51 through a screw 58, and a second thrust spring 510 is arranged between the pressure plate 59 and.
A second lip type sealing ring 55 and a pressing ring 512 are arranged in a space between the metal valve seat 54 and the ball body 57, the second lip type sealing ring 55 comprises two second lip edges, an annular groove is formed between the second lip edges, one second lip edge is pressed on the metal valve seat 54, the other second lip edge is pressed on the ball body 57, and the pressing ring 512 is pressed at the root of the second lip type sealing ring 55 and is fixed on the metal valve seat 54 through a pressing screw 513. An open U-shaped metal spring 514 is mounted in the groove of the second lip seal 55.
Under the action of the second thrust spring 510, the second lip seal 55 is pressed against the ball 57. The compression ring 512 is compressed with compression screw 513 to provide a flat static seal to prevent leakage of media from the inside of the head of the metal valve seat 54, creating a single piston effect valve seat seal.
Compared with the prior art, the feature of embodiment 4 is that the outer first lip of the first lip type seal ring 53 with the first toe heel 515 and the first toe heel 515 are in close contact with the valve body 51, providing a two-stage static seal function of axial seal and planar seal, effectively preventing the medium from leaking from the side of the valve body 51 at low temperature. The first lip on the inside contacts the metal base 54 to provide a semi-dynamic seal, a second lip seal 55 is also provided on the head of the metal base 54, and a U-shaped metal spring 514 on the inside provides the initial sealing force. The second toe-heel 516 is pressed by a pressing ring 512 with a pressing screw 513 to prevent the medium from passing through the back, and the second lip-type seal ring 55 abuts against the spherical surface under the combined action of the medium force and the second thrust spring 510, so that a single-piston effect sealing structure of the inlet end of the valve is formed.
Example 5
A sealing device for a low-temperature ball valve is characterized in that a third lip type sealing ring and a U-shaped metal spring are added at the front end of a first toe on the basis of the structure of embodiment 4, a three-stage sealing structure on the inner side of a valve body is provided, and the sealing device is suitable for working conditions of high-pressure and high-low temperature alternating circulation of the low-temperature valve.
Referring to fig. 6, the valve comprises a valve body 61, a metal valve seat 64 and a ball 67, wherein an annular metal support ring 62 and an annular first lip-type seal ring 63 are arranged in a space between the valve body 61 and the metal valve seat 64, the first lip-type seal ring 63 has two first lip edges, an annular groove is formed between the first lip edges, the first lip edge on the outer side of the first lip-type seal ring 63 is at low pressure with the valve body 61, and the inner side of the first lip-type seal ring 63 is pressed against the metal valve seat 64. One end of the metal support ring 62 is provided with a group of round holes, the protruding head part is pressed in the annular groove of the first lip type seal ring, the group of round holes of the metal support ring are provided with a packing spring 66, and the other end of the thrust spring 66 is pressed against the valve body 61. A plane third lip type sealing ring 617 and a U-shaped metal spring 618 with an annular opening are arranged at the front end of the first toe heel 615, the third lip type sealing ring 617 and the first toe heel 615 of the first lip type sealing ring 63 are embedded into a groove of the valve body 61, a pressure plate 69 is arranged between the valve body 61 and the metal valve seat 64 and is abutted against the back surface of the first lip type sealing ring 63, a screw 68 is embedded into the metal ring 611 of the valve body 61, and the pressure plate 69 is pressed on the valve body 61 through the screw hole.
The head of the metal valve seat 64 is provided with a second lip type sealing ring 65 and an open U-shaped metal spring 614, the second lip type sealing ring 65 is pressed on the metal valve seat 64 through a pressure plate 512 by a screw 613, and the second lip type sealing ring 65 is abutted against the ball 67 under the pushing of the second thrust spring 610.
Compared with the prior art, the technical characteristics of embodiment 5 lie in that the sealing on the inner side of the valve body 61 is realized by a three-stage sealing, the axial sealing of the first lip edge on the outer side of the first lip type sealing ring 63, the plane sealing of the third lip edge on two sides of the third lip type sealing ring 617 and the fixed plane sealing of the first toe heel 615 of the first lip type sealing ring 63, so that the low-temperature medium leakage prevention valve is suitable for the use working conditions of the low-temperature valve under the high-pressure and high-temperature and low-temperature cycle alternation, and prevents the medium leakage of the low-temperature medium from.
Claims (10)
1. A sealing device for a low-temperature ball valve comprises a valve body, a metal valve seat and a ball body, and is characterized in that an annular metal support ring and an annular first lip type sealing ring are arranged in a space between the valve body and the metal valve seat, the first lip type sealing ring comprises two first lip edges, an annular groove is formed between the first lip edges, the outer side of the first lip type sealing ring is pressed against the valve body, and the inner side of the first lip type sealing ring is pressed against the metal valve seat; one end of the metal support ring is a protruding head, the other end of the metal support ring is a group of round holes, and the protruding head is pressed in the annular groove of the first lip type sealing ring; and a thrust spring is arranged in the round hole of the metal support ring, and the other end of the thrust spring is abutted against the valve body.
2. The sealing device for the cryogenic ball valve as defined in claim 1, further comprising another first lip seal and a metal support ring, wherein a partition is disposed between the two first lip seals, the partition is taken as a symmetry line, and the two first lip seals and the two metal support rings are symmetrically arranged back to back.
3. The sealing device for the cryogenic ball valve according to claim 1, wherein a pressing plate is further installed in a space between the valve body and the metal valve seat, an annular first toe heel is connected to the outer side of the first lip-type sealing ring, a notch is formed in the valve body, the first toe heel is pressed on the notch, the pressing plate is fixed on the valve body through a screw, the first lip-type sealing ring is pressed against the pressing plate and the valve body, a second thrust spring is installed between the pressing plate and the metal valve seat, one end of the second thrust spring is embedded into the metal valve seat, and the other end of the second thrust spring is pressed against the pressing plate.
4. A sealing device for a cryogenic ball valve according to any one of claims 1 to 3, wherein the metal valve seat is embedded with an annular sealing ring on the face contacting the ball.
5. The sealing device for the cryogenic ball valve according to claim 1, wherein a pressing plate is further installed in a space between the valve body and the metal valve seat, a first toe heel is connected to the outer side of the first lip-type sealing ring, a notch is formed in the valve body, the first toe heel is pressed on the notch, the first lip-type sealing ring is pressed against the pressing plate and the valve body, a metal ring is arranged on the other side of the pressing plate, the number of the metal rings is four, the four metal rings form a discontinuous circle, an annular groove is formed in the inner wall of the valve body, the metal ring is embedded into the annular groove of the valve body, a screw hole is formed in the metal ring, the pressing plate is pressed on the valve body through the screw hole formed in the metal ring by a screw, and a second thrust spring is installed between the pressing plate and the metal valve seat.
6. The sealing device for a cryogenic ball valve according to claim 5, wherein a second lip seal and a compression ring are arranged in the space between the metal valve seat and the ball body, the second lip seal comprises two second lip edges, an annular groove is arranged between the second lip edges, one of the second lip edges abuts against the metal valve seat, the other second lip edge abuts against the ball body, an annular second toe-heel is connected to the second lip seal, and the compression ring presses against the second toe-heel of the second lip seal and is fixed to the metal valve seat through a compression screw.
7. The seal for a cryogenic ball valve of claim 6, wherein the annular groove of the second lip seal houses an open U-shaped metal spring.
8. The sealing device for a cryogenic ball valve according to any one of claims 5 to 7, wherein an annular gap is formed in the valve body between the first toe and the first lip, a third lip seal is embedded in the annular gap, the third lip seal comprises two third lips, an annular groove is formed between the third lips, and a U-shaped metal spring is installed in the annular groove of the third lip seal; one of the third lip edges abuts against the valve body and the other third lip edge abuts against the first toe heel.
9. The sealing device for a cryogenic ball valve of claim 1, wherein the protruding head is truncated cone shaped, a top edge of the protruding head is rounded, and the protruding head and the annular groove of the first lip seal are contacted by a slope.
10. The sealing device for a cryogenic ball valve according to claim 1, wherein the annular groove of the first lip seal is a tapered cylindrical surface; the first lip type sealing ring is made of PTFE plastic, PCTFE plastic or polyimide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020553550.7U CN212297700U (en) | 2020-04-15 | 2020-04-15 | Sealing device for low-temperature ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020553550.7U CN212297700U (en) | 2020-04-15 | 2020-04-15 | Sealing device for low-temperature ball valve |
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| Publication Number | Publication Date |
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| CN212297700U true CN212297700U (en) | 2021-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020553550.7U Active CN212297700U (en) | 2020-04-15 | 2020-04-15 | Sealing device for low-temperature ball valve |
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| Country | Link |
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| CN (1) | CN212297700U (en) |
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2020
- 2020-04-15 CN CN202020553550.7U patent/CN212297700U/en active Active
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