Ultralow-temperature three-eccentric center butterfly valve

Abstract

The ultralow-temperature three-eccentric center butterfly valve comprises a valve rod, a valve body and a valve plate, the valve rod is rotationally arranged in the valve body, the valve plate is arranged on the valve rod and located in the valve body, the ultralow-temperature three-eccentric center butterfly valve further comprises an extended valve deck, a graphite packing set and a lip-shaped ring, the extended valve deck is arranged on the valve body, the graphite packing set is arranged on the extended valve deck, and the lip-shaped ring is arranged on the extended valve deck. The valve rod is rotatably matched with a through hole of the extended valve cover, the graphite packing group is arranged between the valve rod and the extended valve cover, and the lip-shaped ring is arranged between the valve rod and the extended valve cover and is positioned between the graphite packing group and the valve body; the lip-shaped ring comprises a cobalt-based alloy and PTFE (Polytetrafluoroethylene), and the cobalt-based alloy is coated with the PTFE. Compared with the prior art, the butterfly valve has the advantages that by arranging the lip-shaped ring and the graphite packing set, double sealing of the valve rod is achieved, the low-temperature sealing performance between the valve rod and the extension valve cover is enhanced, and the probability of sealing leakage at the low temperature is reduced.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to an ultra-low temperature three-eccentric butterfly valve. Background Art

[0002] The three-eccentric butterfly valve is a commonly used valve at present. The structure of the current three-eccentric butterfly valve is basically as shown in the patent announcement document CN205780924U. In the butterfly valve of this structure, the valve stem (the figure number in the document is 2) and the valve body (the figure number in the document is 1) are sealed by packing (the figure number in the document is 11, and its material is generally graphite). Since this valve relies on graphite packing for sealing, and the sealing performance of graphite packing is relatively poor, when this valve is used to transport ultra-low temperature (temperature as low as minus 196 degrees Celsius) liquid, the packing is prone to ice. After freezing, abnormal noise and wear will occur when opening and closing the valve, causing liquid leakage. Utility Model Content

[0003] In view of the above problems, the utility model proposes an ultra-low temperature three-eccentric butterfly valve.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A super-low temperature triple-eccentric butterfly valve comprises a valve stem, a valve body and a valve plate, wherein the valve stem is rotatably arranged in the valve body, the valve plate is arranged on the valve stem, and the valve plate is located in the valve body. The valve valve also comprises an extended valve cover, a graphite packing group and a lip ring, wherein the extended valve cover is arranged on the valve body, the valve stem and the through hole of the extended valve cover are rotatably matched together, the graphite packing group is arranged between the valve stem and the extended valve cover, the lip ring is arranged between the valve stem and the extended valve cover, and the lip ring is located between the graphite packing group and the valve body; the lip ring comprises a cobalt-based alloy and PTFE, and the PTFE covers the cobalt-based alloy.

[0006] In this butterfly valve, the lip ring is made of a composite of cobalt-based alloy and PTFE (i.e. polytetrafluoroethylene). The cobalt-based alloy is completely coated by PTFE, and the cobalt-based alloy serves as the skeleton of the entire lip ring. This butterfly valve adopts a double sealing structure between the valve stem and the extended valve cover, namely the lip ring seal and the graphite packing group seal. If the liquid flowing through the valve body wants to overflow, it must first pass through the seal of the lip ring, and then through the seal of the graphite packing group to overflow. In this butterfly valve, since the lip ring is made of a composite of cobalt-based alloy and PTFE, and since PTFE has good low-temperature resistance, the entire lip ring has good low-temperature sealing performance. The entire lip ring has good low-temperature sealing performance. When the valve body is conveying ultra-low temperature liquid (the lowest temperature can be as low as minus 196 degrees Celsius), the lip ring seal can still ensure good sealing performance and will not freeze.

[0007] In summary, the butterfly valve described above realizes double sealing of the valve stem by providing the lip ring and the graphite packing group, thereby enhancing the low-temperature sealing performance between the valve stem and the extended valve cover and reducing the probability of sealing leakage at low temperatures.

[0008] Also, since the graphite packing group in the butterfly valve has good fire resistance, the leakage of the medium in the valve body caused by the seal damage of the graphite packing group during a fire can be avoided.

[0009] Optionally, a valve cover bearing is further included, wherein the valve cover bearing is arranged between the valve stem and the extended valve cover, and the valve cover bearing is located between the graphite packing group and the lip ring.

[0010] The valve cover bearing can separate the graphite packing group and the lip ring, and can also make the valve stem rotate more smoothly.

[0011] Optionally, a packing gland is also included, and the packing gland is arranged between the extended valve cover and the valve stem.

[0012] The function of the packing gland is to compress the graphite packing group.

[0013] Optionally, a screw is provided on the valve cover, a nut is provided on the screw, a butterfly gasket and a flat gasket are provided between the nut and the packing gland, and the flat gasket and the butterfly gasket are sleeved on the screw.

[0014] The nuts, butterfly washers and flat washers enable the packing gland to always compress the graphite packing group.

[0015] Optionally, a body bearing is provided between the valve body and the valve stem, and the body bearing is located inside the valve body.

[0016] The body bearing between the valve body and the valve stem is to ensure that the valve stem is more stable when rotating relative to the valve body.

[0017] Optionally, it further includes a first gasket and a second gasket, wherein the first gasket is arranged between the valve body and the body bearing, and the second gasket is arranged between the body bearing and the valve stem.

[0018] Optionally, it also includes a valve seat, which is arranged on the valve body, and a sealing ring is arranged between the valve seat and the valve body.

[0019] Optionally, it further includes a first wound gasket and a second wound gasket, wherein the first wound gasket is arranged between the valve body and the valve seat, and the second wound gasket is arranged on the valve plate.

[0020] Specifically, the first spiral wound gasket is used to seal the gap between the valve body and the valve seat, while the second spiral wound gasket is used to seal between the sealing ring and the valve plate.

[0021] Optionally, a drip tray is provided on the extended valve cover.

[0022] The function of the drip tray is to allow the condensed water produced on the extended valve cover to drip along the edge of the drip tray to prevent the condensed water from freezing on the surface of the extended valve cover.

[0023] The beneficial effects of the utility model are as follows: by providing the lip ring and the graphite packing group, double sealing of the valve stem is achieved, the low-temperature sealing performance between the valve stem and the extended valve cover is enhanced, and the probability of sealing leakage at low temperatures is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the internal structure of the ultra-low temperature three-eccentric butterfly valve;

[0025] Figure 2 yes Figure 1 The enlarged schematic diagram of A in the middle;

[0026] Figure 3 It is a schematic diagram of the structure of an ultra-low temperature three-eccentric butterfly valve.

[0027] The reference numerals in the figure are: 1. valve body; 2. valve stem; 3. valve plate; 4. extended valve cover; 5. valve seat; 6. sealing ring; 7. first wound gasket; 8. second wound gasket; 9. body bearing; 10. first gasket; 11. second gasket; 12. drip tray; 13. lip ring; 14. valve cover bearing; 15. graphite packing group; 16. flat gasket; 17. butterfly gasket; 18. nut; 19. packing gland. DETAILED DESCRIPTION

[0028] The utility model is described in detail below in conjunction with the accompanying drawings.

[0029] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, an ultra-low temperature three-eccentric butterfly valve includes a valve stem 2, a valve body 1 and a valve plate 3. The valve stem 2 is rotatably arranged in the valve body 1, and the valve plate 3 is arranged on the valve stem 2. The valve plate 3 is located in the valve body 1. It also includes an extended valve cover 4, a graphite packing group 15 and a lip ring 13. The extended valve cover 4 is arranged on the valve body 1. The valve stem 2 and the through hole of the extended valve cover 4 are rotatably matched together. The graphite packing group 15 is arranged between the valve stem 2 and the extended valve cover 4. The lip ring 13 is arranged between the valve stem 2 and the extended valve cover 4 (the lip ring 13 is located on the step inside the extended valve cover 4), and the lip ring 13 is located between the graphite packing group 15 and the valve body 1; the lip ring 13 includes a cobalt-based alloy and PTFE, and the PTFE covers the cobalt-based alloy.

[0030] In this butterfly valve, the lip ring 13 is composed of a composite of a cobalt-based alloy and PTFE (i.e., polytetrafluoroethylene). The cobalt-based alloy is completely coated by PTFE, and the cobalt-based alloy serves as the skeleton of the entire lip ring 13. This butterfly valve adopts a double sealing structure between the valve stem 2 and the extended valve cover 4, namely, the lip ring 13 seals and the graphite packing group 15 seals. If the liquid flowing through the valve body 1 wants to overflow, it must first pass through the seal of the lip ring 13, and then pass through the seal of the graphite packing group 15 to overflow. In this butterfly valve, since the lip ring 13 is composed of a composite of a cobalt-based alloy and PTFE, and since PTFE has good low-temperature resistance, the entire lip ring 13 has good low-temperature sealing performance. The entire lip ring 13 has good low-temperature sealing performance. When the valve body 1 is conveying ultra-low temperature liquid (the lowest temperature can be as low as minus 196 degrees Celsius), the lip ring 13 seal can still ensure good sealing performance and will not freeze.

[0031] In summary, in the butterfly valve, by providing the lip ring 13 and the graphite packing group 15, double sealing of the valve stem 2 is achieved, the low-temperature sealing performance between the valve stem 2 and the extended valve cover 4 is enhanced, and the probability of sealing leakage at low temperatures is reduced.

[0032] Also, since the graphite packing group 15 in the butterfly valve has good fire resistance, leakage of the medium in the valve body 1 due to seal damage of the graphite packing group 15 during a fire can be avoided.

[0033] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a valve cover bearing 14 is also included. The valve cover bearing 14 is arranged between the valve stem 2 and the extended valve cover 4 , and the valve cover bearing 14 is located between the graphite packing group 15 and the lip ring 13 .

[0034] The valve cover bearing 14 can separate the graphite packing set 15 from the lip ring 13 and can also make the valve stem 2 rotate more smoothly.

[0035] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a packing gland 19, which is arranged between the extended valve cover 4 and the valve stem 2.

[0036] The function of the packing gland 19 is to compress the graphite packing group 15 .

[0037] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a screw is arranged on the extended valve cover 4, a nut 18 is arranged on the screw, a butterfly gasket 17 and a flat gasket 16 are arranged between the nut 18 and the packing gland 19, and the flat gasket 16 and the butterfly gasket 17 are sleeved on the screw.

[0038] The nut 18 , the butterfly washer 17 and the flat washer 16 enable the packing gland 19 to always press the graphite packing group 15 .

[0039] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a body bearing 9 is provided between the valve body 1 and the valve stem 2 , and the body bearing 9 is located inside the valve body 1 .

[0040] The body bearing 9 between the valve body 1 and the valve stem 2 is to ensure that the valve stem 2 is more stable when rotating relative to the valve body 1 .

[0041] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a first gasket 10 and a second gasket 11. The first gasket 10 is arranged between the valve body 1 and the body bearing 9, and the second gasket 11 is arranged between the body bearing 9 and the valve stem 2.

[0042] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the valve body 1 further includes a valve seat 5 , which is arranged on the valve body 1 , and a sealing ring 6 is arranged between the valve seat 5 and the valve body 1 .

[0043] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the valve body 1 further includes a first spiral wound gasket 7 and a second spiral wound gasket 8 . The first spiral wound gasket 7 is arranged between the valve body 1 and the valve seat 5 , and the second spiral wound gasket 8 is arranged on the valve plate 3 .

[0044] Specifically, the first spiral wound gasket 7 is used to seal the gap between the valve body 1 and the valve seat 5 , while the second spiral wound gasket 8 is used to seal between the sealing ring 6 and the valve plate 3 .

[0045] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a drip tray 12 is provided on the extended valve cover 4 .

[0046] The function of the drip tray 12 is to make the condensed water generated on the extended valve cover 4 drip along the edge of the drip tray 12 to prevent the condensed water from freezing on the surface of the extended valve cover 4.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. An ultra-low temperature three-eccentric butterfly valve, comprising a valve stem, a valve body and a valve plate, wherein the valve stem is rotatably arranged in the valve body, the valve plate is arranged on the valve stem, and the valve plate is located in the valve body, characterized in that: It also includes an extended valve cover, a graphite packing group and a lip ring, wherein the extended valve cover is arranged on the valve body, the valve stem and the through hole of the extended valve cover are rotatably matched together, the graphite packing group is arranged between the valve stem and the extended valve cover, the lip ring is arranged between the valve stem and the extended valve cover, and the lip ring is located between the graphite packing group and the valve body; the lip ring includes a cobalt-based alloy and PTFE, and the PTFE covers the cobalt-based alloy.

2. The ultra-low temperature triple eccentric butterfly valve according to claim 1, characterized in that: It also includes a valve cover bearing, which is arranged between the valve stem and the extended valve cover, and the valve cover bearing is located between the graphite packing group and the lip ring.

3. The ultra-low temperature triple eccentric butterfly valve according to claim 1, characterized in that: It also includes a packing gland, which is arranged between the extended valve cover and the valve stem.

4. The ultra-low temperature triple eccentric butterfly valve according to claim 3, characterized in that: A screw is arranged on the valve cover, a nut is arranged on the screw, a butterfly gasket and a flat gasket are arranged between the nut and the packing gland, and the flat gasket and the butterfly gasket are sleeved on the screw.

5. The ultra-low temperature triple eccentric butterfly valve according to claim 1, characterized in that: A body bearing is arranged between the valve body and the valve stem, and the body bearing is located in the valve body.

6. The ultra-low temperature triple eccentric butterfly valve according to claim 5, characterized in that: It also includes a first gasket and a second gasket, wherein the first gasket is arranged between the valve body and the body bearing, and the second gasket is arranged between the body bearing and the valve stem.

7. The ultra-low temperature triple eccentric butterfly valve according to claim 1, characterized in that: It also includes a valve seat, which is arranged on the valve body, and a sealing ring is arranged between the valve seat and the valve body.

8. The ultra-low temperature triple eccentric butterfly valve according to claim 7, characterized in that: It also includes a first wound gasket and a second wound gasket, wherein the first wound gasket is arranged between the valve body and the valve seat, and the second wound gasket is arranged on the valve plate.

9. The ultra-low temperature triple eccentric butterfly valve according to claim 1, characterized in that: The extended valve cover is provided with a drip tray.

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