CN202659995U - Plug-in emergency cut-off valve for liquefied natural gas cylinder - Google Patents
Plug-in emergency cut-off valve for liquefied natural gas cylinder Download PDFInfo
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- CN202659995U CN202659995U CN 201220245563 CN201220245563U CN202659995U CN 202659995 U CN202659995 U CN 202659995U CN 201220245563 CN201220245563 CN 201220245563 CN 201220245563 U CN201220245563 U CN 201220245563U CN 202659995 U CN202659995 U CN 202659995U
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- distributing head
- spring
- spiral shell
- shell seat
- bolt
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Abstract
The utility model relates to a plug-in emergency cut-off valve for a liquefied natural gas cylinder. The plug-in emergency cut-off valve is mainly characterized by comprising a distributing head, a sealing piece, a screw-plug gland, an adjusting nut, a bolt, a screw base, a spring and a valve sheet, wherein the screw base is a cylinder with an external threaded cylindrical surface; six through holes and a center through hole are axially formed in the screw base; a 60-DEG angle is formed between every adjacent two of the six through holes; a step-shaped spigot is formed in the middle of the inner wall of the center through hole; the valve sheet and the spring are sleeved on the bolt; the outer diameter of the valve sheet is smaller than the diameter of the inner cavity of the distributing head; the valve sheet can move along the bolt by overcoming the reacting force of the spring under the action of external force; the distance d between the upper surface of the valve sheet and the lower surface of the screw base is 2.5 to 4 millimeters; external thread of the screw base is arranged in the inner cavity of the distributing head and divides the inner cavity of the distributing head into a cavity A and a cavity B; and a bolt connection port C is formed on the side end face of the distributing head and is communicated with the cavity A. The plug-in emergency cut-off valve has the advantages of compact and reasonable structure, small abrasion, long service life, high reliability, high safety performance, convenience for inspection and maintenance and the like.
Description
Technical field
The utility model relates to a kind of liquefied natural gas bottle plug-in type Emergeny Cutoff Valves, and LNG Liquefied natural gas poor with the external and internal pressure of liquid moment that it is adapted to mild balance LNG Liquefied natural gas stop valve especially when opening during with the unexpected explosion of liquid pipeline the automatic LNG Liquefied natural gas of blocking leak in a large number.
Background technique
LNG Liquefied natural gas (LNG) is a kind of low temperature liquid rock gas, and its storage, transportation and use etc. all must be adopted special liquefied natural gas bottle or gas tank, and wherein, flow-limiting valve plays the safety protection effect in air supply system.In the background technique, the flow-limiting valve that adopt in domestic LNG Liquefied natural gas field all is on the vertical exterior line that is installed in distributing head, namely at the distributing head jointing Stainless Steel Tube with female adapter that is welded, two male connections that are welded of the two ends of flow-limiting valve, two male connections connect with the internal thread that is welded in the Stainless Steel Tube of distributing head and the Stainless Steel Tube that is connected external pipe respectively, in addition, on the mode of action, the keying of this flow-limiting valve is to control by the motion of steel ball in the valve.This connection and mode of action existence assemble, safeguard loaded down with trivial details, be unsuitable for the defectives such as the system intergration, particularly begin to use the moment of liquid at stop valve, because having pressure difference between gas cylinder internal and the external carburettor, steel ball in the flow-limiting valve internal vertical pipeline can move to rapidly on the lateral duct under the effect of the instant impact that pressure difference forms, block lateral duct, throttle down causes liquified natural gas can not enter vaporizer.Some flow-limiting valve manufacturing enterprise simply cancels the current limliting steel ball at present, so just makes flow-limiting valve lose due effect, has stayed simultaneously potential safety hazard.For overcoming the deficiencies in the prior art, liquefied natural gas bottle plug-in type Emergeny Cutoff Valves is developed.
Summary of the invention
Technical problem to be solved in the utility model is that a kind of liquefied natural gas bottle plug-in type Emergeny Cutoff Valves will be provided, it is directly inner in distributing head by the screw thread spinning, having cancelled valve is connected with pipeline between the distributing head, be designed with the steel ball that spring uses to substitute prior art between valve block and the valve seat, active force with spring comes the balance LNG Liquefied natural gas to begin the pressure difference of exocoel in the moment Emergeny Cutoff Valves with liquid, avoiding just commonly using liquid begins moment valve accident and closes, the timely autoshutdown of energy when the unexpected explosion of liquid pipeline is used in the outside is blocked LNG Liquefied natural gas and is leaked in a large number simultaneously.Not only compact structure, Security are good for it, manufacturing and maintenance cost are low, can greatly improve operational safety simultaneously.
The technological scheme that its technical problem that solves the utility model adopts is: it comprises distributing head, Sealing, plug screw gland, adjusting nut, bolt, spiral shell seat, spring, valve block,
The spiral shell seat is the cylindrical body that external cylindrical surface is designed to screw thread, and its axial design has six five equilibriums to be mutually the central through bore that 60 ° through hole and inwall middle part are designed with the step seam,
Valve block, spring are set in bolt successively, and the bolt that is set with valve block, spring is loaded on the central through bore of spiral shell seat, and an end of spring relies on the step seam of central through bore inwall, the other end top pressure valve sheet of spring, and the adjusting nut spinning is in the front end screw thread of bolt,
Adjusting screws spinning in the adjusting nut of bolt front end, and Compress Spring makes spring produce certain precompression, and the spacing d between control valve block upper surface and the spiral shell seat lower surface is 2.5 millimeters～4 millimeters scopes,
Assemble bolt, spring, valve block in the central through bore of spiral shell seat and regulate by adjusting nut and control well after the spacing d value scope, spiral shell seat outside thread is loaded on the inner chamber of distributing head, the spiral shell seat is separated into up and down two chambeies of A chamber and B chamber with the inner chamber of distributing head, the external diameter of valve block is less than the intracavity diameter of distributing head, the valve block that is set in bolt can overcome the reaction force of spring under external force along the bolt axial motion
Sealing is loaded on the seam of distributing head inner chamber upper end bead, and plug screw gland spinning seals the A chamber in upper end and the press seal spare of distributing head inner chamber,
The side end face of distributing head is designed with a C threaded joint that is communicated with the A chamber, and distributing head is by can linking to each other with external carburettor with the liquid pipeline that the C threaded joint is spirally connected.
The utility model is compared the beneficial effect that produces with prior art:
1, substitutes the steel ball design that prior art adopts by the design of adopting spring to add valve block, external and internal pressure with liquid moment when balance LNG Liquefied natural gas stop valve is opened gently is poor, effectively avoiding normal feed flow to begin moment valve accident closes, simultaneously when LNG Liquefied natural gas outside during with the unexpected explosion of liquid pipeline the energy automatic emergency close, in time the blocking-up LNG Liquefied natural gas leaks the stable equilibrium when really realizing normal feed flow and the emergency cut-off under the fortuitous event in a large number.
2, because Emergeny Cutoff Valves adopts the plug-in type design to be assemblied in the cavity of distributing head, the external connecting pipe road between having saved in the prior art from the distributing head to the valve reduced connected node, but Effective Raise uses efficiency.
3, it has the advantages such as compact structure is reasonable, wearing and tearing are little, long service life, reliability is high, Safety performance is good, and simultaneously its manufacturing, installation and maintenance cost are low, detection, easy to maintenance quick.
Description of drawings
Fig. 1 is the structural representation of the utility model liquefied natural gas bottle plug-in type Emergeny Cutoff Valves.
Opening state figure when Fig. 2 is the normal feed flow of liquefied natural gas bottle plug-in type Emergeny Cutoff Valves.
Closed condition figure when Fig. 3 is liquefied natural gas bottle plug-in type Emergeny Cutoff Valves emergency cut-off.
Fig. 4 is the structural representation of spiral shell seat 6 among Fig. 1.
Fig. 5 is the P-P view of spiral shell seat 6 among Fig. 4.
Embodiment
Below in conjunction with accompanying drawing most preferred embodiment of the present utility model is further described.
Referring to accompanying drawing, a kind of liquefied natural gas bottle plug-in type Emergeny Cutoff Valves, it comprises distributing head 1, Sealing 2, plug screw gland 3, adjusting nut 4, bolt 5, spiral shell seat 6, spring 7, valve block 8.
Valve block 8, spring 7 are successively from the front end sleeve of bolt 5 bolt 5 of packing into, the bolt 5 that is set with valve block 8, spring 7 central through bore 10 of spiral shell seat 6 of packing into from spiral shell seat 6 lower ends, one end of spring 7 relies on the step seam of spiral shell seat 6 central through bores 10 inwalls, the other end top pressure valve sheet 8 of spring 7, adjusting nut 4 spinnings are in the front end screw thread of bolt 5.
Adjusting screws spinning in the adjusting nut 4 of bolt 5 front ends, and Compress Spring 7 makes spring 7 produce certain precompression, continues to regulate adjusting nut 4, makes the spacing d between valve block 8 upper surfaces and spiral shell seat 6 lower surfaces be controlled at 2.5 millimeters～4 millimeters scope.
Assemble bolt 5, spring 7, valve block 8 in the central through bore 10 of spiral shell seat 6 and regulate by adjusting nut 4 and control well after the spacing d value scope, spiral shell seat 6 outside threads are loaded on the inner chamber of distributing head 1, spiral shell seat 6 is separated into up and down two chambeies of A chamber and B chamber with the inner chamber of distributing head 1, the external diameter of valve block 8 is less than the intracavity diameter of distributing head 1, and the valve block 8 that is set in bolt 5 can overcome the reaction force of spring 7 under external force along bolt 5 axial motions.
The side end face of distributing head 1 is designed with a C threaded joint that is communicated with the A chamber, and distributing head 1 is by can linking to each other with external carburettor with the liquid pipeline that the C threaded joint is spirally connected.
1, during the normal feed flow of liquefied natural gas bottle:
As shown in Figure 2, when the liquefied natural gas bottle stop valve is opened, LNG Liquefied natural gas enters the B chamber of distributing head 1 in the bottle, LNG Liquefied natural gas promotes valve block 8 and axially moves upward along bolt 5, the reaction force mild balance A chamber of spring 7 generations this moment and the pressure difference in B chamber, because the external diameter of valve block 8 is less than the intracavity diameter of distributing head 1, LNG Liquefied natural gas flows into from the gap between valve block 8 outers and distributing head 1 inner chamber, be mutually 60 ° of equally distributed six through holes 9 by spiral shell seat 6 axial five equilibriums and enter the A chamber, be transported to the outside vaporizer that connects by what the A chamber flowed through that the C threaded joint is spirally connected with the liquid pipeline again, realize normal feed flow, behind the normal feed flow certain hour, the pressure in A chamber and B chamber reaches balance.
2, the C threaded joint be spirally connected with the unexpected explosion of liquid pipeline the time:
As shown in Figure 3, when the C threaded joint connect with the unexpected explosion of liquid pipeline the time, drop to 0 by the C threaded joint with pressure moment in the A chamber of liquid pipeline communication this moment, cause the pressure difference moment increase between the B chamber, A chamber, the reaction force promotion valve block 8 that LNG Liquefied natural gas in this moment B chamber overcomes spring 7 moves upward rapidly, the upper surface of valve block 8 and the lower surface of spiral shell seat 6 are fitted fully, automatic emergency cuts off six through holes 9 on the spiral shell seat 6, make LNG Liquefied natural gas can not arrive the A chamber, in time block LNG Liquefied natural gas and leak in a large number.
Claims (4)
1. a liquefied natural gas bottle plug-in type Emergeny Cutoff Valves is characterized in that it comprises distributing head (1), Sealing (2), plug screw gland (3), adjusting nut (4), bolt (5), spiral shell seat (6), spring (7), valve block (8);
The axial design of spiral shell seat (6) has a central through bore (10), and there is a step seam at the inwall middle part of central through bore (10);
Valve block (8), spring (7) are set in bolt (5) successively;
Be set with the central through bore (10) that the bolt (5) of valve block (8), spring (7) is packed into and is loaded on spiral shell seat (6) from spiral shell seat (6) lower end, one end of spring (7) relies on the step seam of the inwall of spiral shell seat (6) central through bore (10), the other end top pressure valve sheet (8) of spring (7);
Adjusting nut (4) spinning regulates screwing adjusting nut (4) in the front end screw thread of bolt (5), and Compress Spring (7) makes spring (7) produce certain precompression;
Spiral shell seat (6) outside thread is loaded on the inner chamber of distributing head (1), and spiral shell seat (6) is separated into up and down two chambeies of A chamber and B chamber with the inner chamber of distributing head (1);
Sealing (2) is loaded on the seam of distributing head (1) inner chamber upper end bead;
Plug screw gland (3) screws by outside thread and is loaded on distributing head (1) inner chamber upper end press seal spare (2), and plug screw gland (3) is with the A chamber sealing of distributing head (1) inner chamber upper end;
The side end face of distributing head (1) is designed with a C threaded joint, and C threaded joint and A chamber communicate, and can be spirally connected by the C threaded joint and use the liquid pipeline.
2. liquefied natural gas bottle plug-in type Emergeny Cutoff Valves according to claim 1 is characterized in that described spiral shell seat (6) is designed to the cylindrical body of screw thread for external cylindrical surface, the through hole (9) that the axial design of spiral shell seat (6) has six five equilibriums to be mutually 60 °.
3. liquefied natural gas bottle plug-in type Emergeny Cutoff Valves according to claim 1 is characterized in that the spacing d between described valve block (8) upper surface and spiral shell seat (6) lower surface is controlled at 2.5 millimeters～4 millimeters scopes.
4. liquefied natural gas bottle plug-in type Emergeny Cutoff Valves according to claim 1, it is characterized in that the external diameter of described valve block (8) less than the intracavity diameter of distributing head (1), valve block (8) can overcome the reaction force of spring (7) under external force along bolt (5) axial motion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220245563 CN202659995U (en) | 2012-05-29 | 2012-05-29 | Plug-in emergency cut-off valve for liquefied natural gas cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220245563 CN202659995U (en) | 2012-05-29 | 2012-05-29 | Plug-in emergency cut-off valve for liquefied natural gas cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202659995U true CN202659995U (en) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220245563 Expired - Fee Related CN202659995U (en) | 2012-05-29 | 2012-05-29 | Plug-in emergency cut-off valve for liquefied natural gas cylinder |
Country Status (1)
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| CN (1) | CN202659995U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705546A (en) * | 2012-05-29 | 2012-10-03 | 江南工业集团有限公司 | Inserting-type emergency cut-off valve for liquefied natural gas cylinder |
-
2012
- 2012-05-29 CN CN 201220245563 patent/CN202659995U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705546A (en) * | 2012-05-29 | 2012-10-03 | 江南工业集团有限公司 | Inserting-type emergency cut-off valve for liquefied natural gas cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20130529 |