CN211474891U - Axial-flow check valve rotation-proof structure for LNG - Google Patents
Axial-flow check valve rotation-proof structure for LNG Download PDFInfo
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- CN211474891U CN211474891U CN201922136991.7U CN201922136991U CN211474891U CN 211474891 U CN211474891 U CN 211474891U CN 201922136991 U CN201922136991 U CN 201922136991U CN 211474891 U CN211474891 U CN 211474891U
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
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Abstract
An anti-rotation structure of an axial flow check valve for LNG (liquefied natural gas) comprises a valve body, wherein a valve cavity of the valve body is internally provided with a flow guide cover, a valve clack is in sealing fit with a valve seat arranged on the valve body, one end of a shaft I is fixedly connected to the center of the valve clack at the end outside the valve cavity, the other end of the shaft I is supported by uniformly distributed oval ribs, the oval ribs are connected with a shaft sleeve I arranged on the shaft I, the other end of the shaft sleeve I is arranged on a retaining ring, the retaining ring; the shaft I and the shaft sleeve I are assembled into a whole through a key. The utility model discloses prevent that the valve clack is rotatory under the effect of medium and the valve clack countersunk head phenomenon appears opening and the in-process of closing to and prevented the frictional heat and the static of rotatory production, guaranteed the fail safe nature of valve.
Description
Technical Field
The utility model belongs to a technical field is made to the valve, relates to the valve field of making that is applied to LNG liquefied natural gas device, specifically indicates an axial-flow type check valve anti-rotation structure for LNG.
Background
According to the national energy planning, nearly 30 domestic LNG receiving stations are planned and constructed during the 'thirteen-five' period in the transport, construction and the next years, and the receiving capacity exceeds 6000 million tons.
It is understood that one LNG receiving station needs to be equipped with 4000 valves, of which 2300 require inlets. At present, the low-temperature gate valve, the stop valve and the check valve are mainly made in China, and some low-temperature ball valves and low-temperature axial flow type check valves have some achievements, but high-pressure low-temperature ball valves, large-caliber low-temperature butterfly valves, low-temperature axial flow type check valves, low-temperature high-pressure regulating valves and the like are imported in large quantity. These products require low temperature resistance, high pressure resistance, and high pressure difference resistance, and need to organize a domestic attack and customs.
LNG liquefied natural gas belongs to dangerous system, easily fires, leaks the explosion. The main factors causing the combustion and explosion of the LNG dangerous system are as follows: a. friction between valve components; b. static electricity generated inside the valve due to various reasons; c. the valve flap sinks, leading to failure of the valve to close. d. The conventional seal material of the valve substantially failed at-196 ℃.
The conventional axial-flow check valve clack does not have front guide, the phenomenon of the valve clack sinking is often generated, the sealing position of the valve seat is sealed by adopting other materials such as PTFE (polytetrafluoroethylene), and the valve seat is easy to deform and fail at the ultralow temperature.
SUMMERY OF THE UTILITY MODEL
The utility model provides an axial-flow type check valve anti-rotation structure for LNG to solve LNG liquefied natural gas pipeline and often take place the valve clack and rotate the problem that produces the friction and arouse accident and valve clack countersunk head to leak, guarantee the security that the valve used.
In order to achieve the above object, the utility model adopts the following technical scheme:
an anti-rotation structure of an axial flow check valve for LNG (liquefied natural gas) comprises a valve body, wherein a valve cavity of the valve body is internally provided with a flow guide cover, a valve clack is in sealing fit with a valve seat arranged on the valve body, one end of a shaft I is fixedly connected to the center of the valve clack at the end outside the valve cavity, the other end of the shaft I is supported by uniformly distributed oval ribs, the oval ribs are connected with a shaft sleeve I arranged on the shaft I, the other end of the shaft sleeve I is arranged on a retaining ring, the retaining ring; the shaft I and the shaft sleeve I are assembled into a whole through a key.
One end of the shaft II is fixedly connected to the center of the valve clack at the inner end of the valve cavity, the other end of the shaft II is supported by a flow guide cover supporting rib, the supporting rib is connected with a spring seat, the spring seat is connected with a shaft sleeve II assembled on the shaft II, and the other end of the supporting rib is installed on the flow guide cover; the outer end of the shaft sleeve II is positioned and fixed by a baffle plate arranged on the shaft II.
And a spring is arranged on a shaft II between the spring seat and the valve clack.
The utility model discloses a design has 3 oval brace rod back shafts of equipartition I5 in the valve import retaining ring to with the fixed check ring 2 of screw 7 of equipartition, irrotational when guaranteeing that the valve clack is opened and is closed plays and prevents changeing the guide rail and prevent the heavy first effect, establishes and installs the spring on back shaft II in the kuppe, ensures that the valve clack can return smoothly after opening and close. A lip-shaped ring sealing structure is adopted between the valve seat and the valve body, reverse sealing is adopted, and then the retaining ring 2 is used for reinforcing and fixing, so that the valve can be reliably sealed at the temperature of-196 ℃, the leakage is avoided, and the potential safety hazard is eliminated.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1-valve body, 2-retainer ring, 3-lip ring, 4-valve seat, 5-shaft I, 6-key,
7-screw, 8-shaft sleeve I, 9-valve clack, 10-spring, 11-shaft II, 12-shaft sleeve II, 13-spring seat
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and the detailed description
An anti-rotation structure of an axial flow check valve for LNG (liquefied natural gas) comprises a valve body 1, wherein a guide cover is arranged in a valve cavity of the valve body 1, the guide cover is generally designed into a hollow conical shape and is coaxial with the valve body 1, a valve clack 9 is in sealing fit with a valve seat 4 arranged on the valve body, one end of a shaft I5 is welded in the center of the valve clack 9 at the end outside the valve cavity, the other end of the shaft I5 is supported by uniformly distributed oval ribs, the oval ribs are connected with a shaft sleeve I8 arranged on the shaft I5, the other end of the shaft I is arranged on a check ring 2, and the check ring 2; one end of the retainer ring 2 compresses the valve seat 4; the shaft I5 and the shaft sleeve I8 are assembled into a whole through a key 6. This structure prevents that valve clack 9 from rotating under the effect of medium force, and irrotation and not countersunk when guaranteeing that valve clack 9 opens and closes play and prevent changeing guide rail supporting role, has prevented producing frictional heat and static moreover.
One end of the shaft II 11 is welded at the center of the valve clack 9 at the inner end of the valve cavity, and the other end of the shaft II is supported by the air guide sleeve supporting rib and used for supporting the valve clack 9 so as to prevent the valve clack 9 from sinking in the movement process. The support rib is connected with a spring seat 13, the spring seat 13 is connected with a shaft sleeve II 12 arranged on a shaft II 11, and the other end of the support rib is arranged on the air guide sleeve; the outer end of the shaft sleeve II 12 is positioned and fixed by a baffle plate arranged on the shaft II 11. The structure is used for reducing friction and reducing the opening moment of the valve clack; ensuring that the valve clacks 9 can be coaxial when opening and closing.
And a spring 10 is arranged on a shaft II 11 between the spring seat 13 and the valve clack 9. The spring 10 can ensure that the valve clack 9 can smoothly return to close the valve after opening.
A Lip-shaped ring 3 (Lip seal: 230323197) sealing structure is adopted between the valve body 1 and the valve seat 4, reverse sealing is adopted, and then the valve is reinforced and fixed by a thread retainer ring, so that the valve can be reliably sealed at the temperature of-196 ℃, the leakage is avoided, and the potential safety hazard is eliminated.
Claims (4)
1. An anti-rotation structure of an axial flow check valve for LNG (liquefied natural gas) comprises a valve body (1), wherein a valve cavity of the valve body (1) is internally provided with a flow guide cover, and a valve clack (9) is in sealing fit with a valve seat (4) arranged on the valve body; the shaft I (5) and the shaft sleeve I (8) are assembled into a whole through a key (6).
2. The axial flow type check valve anti-rotation structure for LNG according to claim 1, wherein: one end of a shaft II (11) is fixedly connected to the center of the valve clack (9) at the inner end of the valve cavity, the other end of the shaft II is supported by a flow guide cover supporting rib, the supporting rib is connected with a spring seat (13), the spring seat (13) is connected with a shaft sleeve II (12) assembled on the shaft II (11), and the other end of the supporting rib is installed on the flow guide cover; the outer end of the shaft sleeve II (12) is positioned and fixed by a baffle plate arranged on the shaft II (11).
3. The axial flow type check valve anti-rotation structure for LNG according to claim 2, wherein: and a spring (10) is arranged on a shaft II (11) between the spring seat (13) and the valve clack (9).
4. The axial flow type check valve anti-rotation structure for LNG according to claim 1, wherein: and a lip-shaped ring (3) is adopted between the valve body (1) and the valve seat (4) for reverse sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922136991.7U CN211474891U (en) | 2019-12-03 | 2019-12-03 | Axial-flow check valve rotation-proof structure for LNG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922136991.7U CN211474891U (en) | 2019-12-03 | 2019-12-03 | Axial-flow check valve rotation-proof structure for LNG |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211474891U true CN211474891U (en) | 2020-09-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922136991.7U Active CN211474891U (en) | 2019-12-03 | 2019-12-03 | Axial-flow check valve rotation-proof structure for LNG |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211474891U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11976747B2 (en) | 2019-03-20 | 2024-05-07 | Danfoss A/S | Compressor unit with a damped axial check valve for a discharge outlet |
-
2019
- 2019-12-03 CN CN201922136991.7U patent/CN211474891U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11976747B2 (en) | 2019-03-20 | 2024-05-07 | Danfoss A/S | Compressor unit with a damped axial check valve for a discharge outlet |
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