CN102705546A - Inserting-type emergency cut-off valve for liquefied natural gas cylinder - Google Patents
Inserting-type emergency cut-off valve for liquefied natural gas cylinder Download PDFInfo
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- CN102705546A CN102705546A CN2012101703950A CN201210170395A CN102705546A CN 102705546 A CN102705546 A CN 102705546A CN 2012101703950 A CN2012101703950 A CN 2012101703950A CN 201210170395 A CN201210170395 A CN 201210170395A CN 102705546 A CN102705546 A CN 102705546A
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- distributing head
- spiral shell
- shell seat
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Abstract
The invention relates to an inserting-type emergency cut-off valve for a liquefied natural gas cylinder. The inserting-type emergency cut-off valve has the main technical characteristic of comprising a distributing head, a seal element, a plug screw pressing cover, an adjusting nut, a bolt, a screw seat, a spring and a valve sheet, wherein the screw seat is an externally-threaded cylinder with a cylindrical surface, six through holes mutually forming 60-degree angles mutually and a center through hole are formed on the screw seat, and a step limiting opening is formed at the middle part of the inner wall of the center through hole. The bolt is sleeved with the valve sheet and the spring; the external diameter of the valve sheet is less than the diameter of the inner cavity of the distributing head; the valve sheet can overcome the reacting force of the spring under the action of external force to make an upward motion along the bolt; the separation distance (d) between the upper surface of the valve sheet and the lower surface of the screw seat ranges from 2.5 mm to 4 mm; the external thread of the screw seat is installed in the inner cavity of the distributing head so as to divide the inner cavity into an A cavity and a B cavity; and a C thread connecting opening formed on the side end surface of the distributing head is communicated with the A cavity. The inserting-type emergency cut-off valve has the advantages of compact and reasonable structure, small abrasion, long service life, high reliability, good safety performance, convenience in detection and maintenance, and the like.
Description
Technical field
The present invention relates to a kind of LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves, the automatic LNG Liquefied natural gas of blocking leaked in a large number when it was adapted to mild balance LNG Liquefied natural gas stop valve especially when opening with the external and internal pressure difference of liquid moment and LNG Liquefied natural gas with the unexpected explosion of liquid pipeline.
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 LNG Liquefied natural gas gas cylinder 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 domestic LNG Liquefied natural gas field is adopted all is on the vertical exterior line that is installed in distributing head, promptly at distributing head jointing the Stainless Steel Tube that is welded with female adapter, and 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 through 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 defectives such as the system intergration, particularly begin moment, because of having pressure difference between the inside and outside vaporizer of gas cylinder with liquid at stop valve; 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 get into 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 potential safety hazard simultaneously.For overcoming the deficiency of existing technology, LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves is developed.
Summary of the invention
Technical problem to be solved by this invention is that a kind of LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves will be provided; It is directly inner in distributing head through the screw thread spinning; Having cancelled valve is connected with pipeline between the distributing head; Be designed with spring between valve block and the valve seat substituting the steel ball that existing technology is used, come the balance LNG Liquefied natural gas to begin the pressure difference of exocoel in the moment Emergeny Cutoff Valves, avoid liquid just commonly used to begin moment valve accident and close with liquid with the active force of spring; Can in time close automatically during when outside simultaneously, block LNG Liquefied natural gas and leak in a large number with the unexpected explosion of liquid pipeline.Not only compact structure, Security are good for it, manufacturing and maintenance cost are low, can improve operational safety greatly simultaneously.
The technological scheme that the present invention solves its technical problem employing is: it comprises distributing head, Sealing, plug screw gland, adjusting nut, bolt, spiral shell seat, spring, valve block,
The spiral shell seat is designed to the cylindrical body of screw thread for external cylindrical surface, the central through bore that through hole and the inwall middle part that its axial design has six five equilibriums to be mutually 60 ° is 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 roof pressure valve block of spring, and the adjusting nut spinning is in the front end screw thread of bolt,
Adjusting is screwed spinning in the adjusting nut of bolt front end, and pressure 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 and control well after the spacing d value scope through adjusting nut; Spiral shell seat outside thread is loaded on the inner chamber of distributing head; The spiral shell seat is separated into A chamber and B chamber two chambeies up and down with the inner chamber of distributing head; The external diameter of valve block is less than the intracavity diameter of distributing head, is set in reaction force that the valve block of bolt can overcome 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 the upper end and the compressing sealing element of distributing head inner chamber,
The side end face of distributing head is designed with a C who is communicated with the A chamber mouth that is spirally connected, and distributing head is spirally connected can linking to each other with external carburettor with the liquid pipeline that mouth is spirally connected through C.
The present invention compares the beneficial effect that is produced with existing technology:
1, substitutes the steel ball design that existing technology adopts through 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 ability automatic emergency close, in time block LNG Liquefied natural gas and leak in a large number, stable equilibrium when really realizing normal feed flow and the emergency cut-off under the fortuitous event.
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 existing technology from the distributing head to the valve has reduced connected node, can effectively improve the use efficiency.
3, it have compact structure rationally, little, the long service life of wearing and tearing, advantage such as reliability is high, Safety performance is good, its manufacturing simultaneously, installation and maintenance cost are low, detect, easy to maintenance fast.
Description of drawings
Fig. 1 is the structural representation of LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves of the present invention.
Opening state figure when Fig. 2 is the normal feed flow of LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves.
Closed condition figure when Fig. 3 is LNG Liquefied natural gas gas cylinder 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 invention is further described.
Referring to accompanying drawing, a kind of LNG Liquefied natural gas gas cylinder 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 roof pressure valve block 8 of spring 7, adjusting nut 4 spinnings are in the front end screw thread of bolt 5.
Adjusting is screwed spinning in the adjusting nut 4 of bolt 5 front ends, and pressure spring 7 makes spring 7 produce certain precompression, continues to regulate adjusting nut 4, makes 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 and control well after the spacing d value scope through adjusting nut 4; Spiral shell seat 6 outside threads are loaded on the inner chamber of distributing head 1; Spiral shell seat 6 is separated into A chamber and B chamber two chambeies up and down 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, is set in reaction force that the valve block 8 of bolt 5 can overcome spring 7 under external force along bolt 5 axial motions.
The side end face of distributing head 1 is designed with a C who is communicated with the A chamber mouth that is spirally connected, and distributing head 1 is spirally connected can linking to each other with external carburettor with the liquid pipeline that mouth is spirally connected through C.
1, during the normal feed flow of LNG Liquefied natural gas gas cylinder:
As shown in Figure 2; When LNG Liquefied natural gas gas cylinder stop valve was opened, LNG Liquefied natural gas got into the B chamber of distributing head 1 in the bottle, and 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, is mutually 60 ° of equally distributed six through holes 9 through spiral shell seat 6 axial five equilibriums and gets into the A chamber; Again by the A chamber flow through that C is spirally connected that mouth is spirally connected with the vaporizer of liquid line transportation to outside connection; Realize normal feed flow, behind the normal feed flow certain hour, the pressure in A chamber and B chamber reaches balance.
2, C be spirally connected that mouth is spirally connected with the explosion of liquid pipeline accident the time:
As shown in Figure 3; When C be spirally connected mouthful connect with the explosion of liquid pipeline accident the time; Pressure moment in the A chamber that is spirally connected mouthful through C this moment and is communicated with the liquid pipeline drops to 0, causes the pressure difference moment between the B chamber, A chamber to increase, and the reaction force promotion valve block 8 that the 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, makes LNG Liquefied natural gas can not arrive the A chamber, in time blocks LNG Liquefied natural gas and leaks in a large number.
Claims (4)
1. a LNG Liquefied natural gas gas cylinder 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 roof pressure valve block (8) of spring (7);
Adjusting nut (4) spinning is regulated the adjusting nut (4) of screwing in the front end screw thread of bolt (5), and pressure 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 A chamber and B chamber two chambeies up and down 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) is screwed through outside thread and is loaded on distributing head (1) inner chamber upper end compressing sealing element (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 the C mouth that is spirally connected, and C is spirally connected and mouthful communicates with the A chamber, is spirally connected mouthful can be spirally connected through C and uses the liquid pipeline.
2. LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves according to claim 1 is characterized in that said spiral shell seat (6) is designed to the cylindrical body of screw thread, the through hole (9) that the axial design of spiral shell seat (6) has six five equilibriums to be mutually 60 ° for external cylindrical surface.
3. LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves according to claim 1 is characterized in that the spacing d between said valve block (8) upper surface and spiral shell seat (6) lower surface is controlled at 2.5 millimeters～4 millimeters scopes.
4. LNG Liquefied natural gas gas cylinder plug-in type Emergeny Cutoff Valves according to claim 1; It is characterized in that the intracavity diameter of the external diameter of said valve block (8) less than 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 |
|---|---|---|---|
| CN2012101703950A CN102705546A (en) | 2012-05-29 | 2012-05-29 | Inserting-type emergency cut-off valve for liquefied natural gas cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101703950A CN102705546A (en) | 2012-05-29 | 2012-05-29 | Inserting-type emergency cut-off valve for liquefied natural gas cylinder |
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| CN102705546A true CN102705546A (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101703950A Pending CN102705546A (en) | 2012-05-29 | 2012-05-29 | Inserting-type emergency cut-off valve for liquefied natural gas cylinder |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2568903Y (en) * | 2002-09-06 | 2003-08-27 | 重庆汽车研究所 | Leakage protective valve of compressed gas duct |
| US6672328B2 (en) * | 2000-12-28 | 2004-01-06 | Col-Ven S.A. | Pressure-controlled three-way valve device for transport vehicle tires |
| CN2615459Y (en) * | 2003-01-23 | 2004-05-12 | 重庆汽车研究所 | Compressed natural gas pipeline overflow protection valve |
| CN2771595Y (en) * | 2005-02-05 | 2006-04-12 | 简春博 | Non-water return-air valve for running water pipe |
| CN101349357A (en) * | 2007-07-19 | 2009-01-21 | 曹康年 | Safe buffering two-way valve |
| CN101699112A (en) * | 2009-11-03 | 2010-04-28 | 叶云勤 | Gas leakage automatic safety valve |
| CN202659995U (en) * | 2012-05-29 | 2013-01-09 | 江南工业集团有限公司 | Plug-in emergency cut-off valve for liquefied natural gas cylinder |
-
2012
- 2012-05-29 CN CN2012101703950A patent/CN102705546A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6672328B2 (en) * | 2000-12-28 | 2004-01-06 | Col-Ven S.A. | Pressure-controlled three-way valve device for transport vehicle tires |
| CN2568903Y (en) * | 2002-09-06 | 2003-08-27 | 重庆汽车研究所 | Leakage protective valve of compressed gas duct |
| CN2615459Y (en) * | 2003-01-23 | 2004-05-12 | 重庆汽车研究所 | Compressed natural gas pipeline overflow protection valve |
| CN2771595Y (en) * | 2005-02-05 | 2006-04-12 | 简春博 | Non-water return-air valve for running water pipe |
| CN101349357A (en) * | 2007-07-19 | 2009-01-21 | 曹康年 | Safe buffering two-way valve |
| CN101699112A (en) * | 2009-11-03 | 2010-04-28 | 叶云勤 | Gas leakage automatic safety valve |
| CN202659995U (en) * | 2012-05-29 | 2013-01-09 | 江南工业集团有限公司 | Plug-in emergency cut-off valve for liquefied natural gas cylinder |
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Application publication date: 20121003 |