CN103470217A - Low-voltage triggering type compression bar unstability wellhead shutdown valve - Google Patents
Low-voltage triggering type compression bar unstability wellhead shutdown valve Download PDFInfo
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- CN103470217A CN103470217A CN2012101865832A CN201210186583A CN103470217A CN 103470217 A CN103470217 A CN 103470217A CN 2012101865832 A CN2012101865832 A CN 2012101865832A CN 201210186583 A CN201210186583 A CN 201210186583A CN 103470217 A CN103470217 A CN 103470217A
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Abstract
The invention relates to a low-voltage triggering type compression bar unstability wellhead shutdown valve, which comprises the following main components of a piston, a valve body, a valve clack, a valve seat, a stop dog, a valve bar, a valve deck, a spring, a spring catch, a thin and long bar, a bar cage, a bar nut, a rest bolt and the like. The shutdown valve is provided with a piston structure communicated with the outside, and the shutdown triggering mechanism of the shutdown valve is designed according to the compression bar unstability principle; when the pressure in a pipeline is higher than a specific point, axial force borne by the thin and long bar is lowered than the compression bar unstability critical load, the compression bar is kept stable, fluid can flow through a cavity between the valve clack and the valve bar, and the valve is under the opening state; when the pressure in the pipeline is lowered than the specific point, the load borne by the thin and long bar exceeds the compression bar unstability critical load, the compression bar is unstable, the effective length of the compression bar is reduced instantaneously, the valve bar upwards moves under the thrust action of the spring, and the valve clack enters the valve seat to shut down the valve to cut off the fluid. The valve has the advantages of simple structure and higher reliability, and the valve is only provided with two movement components.
Description
Technical field
The present invention relates to trigger the well head safe shut-off valve for the low pressure that ensures station equipment or appendix safety in the Gas Exploitation And Transmission well site.
Background technology
The low pressure flip-over type well head safe shut-off valve of controlling natural gas output is installed on ground, Gas Exploitation And Transmission well site.This is that natural gas can be discharged in atmosphere in this case, has both polluted atmosphere because of downstream line, valve or the inefficacy of equipment or the reduction that fracture can cause manifold pressure, exists and causes the hidden danger of fire and blast again, and cause economic loss.The effect of this safety shut-off valves is to close natural gas path when loine pressure drops to certain value, thereby reduces the leakage of natural gas, alleviates atmosphere pollution, reduces disaster hidden-trouble and economic loss.
Most well head safe shut-off valve is comprised of shut-off valve and hydraulic control system two parts.Generally each functional part of hydraulic control system is independent installation the respectively, between parts and parts, adopts pipeline to be connected.So, just cause the tube connector line length between each parts, the situation that jointing is many, made potential leakage point showed increased.In addition, the moving component of shut-off valve itself is also more.These factors all can cause the reliability decrease of whole shut-off valve system.
Summary of the invention
The purpose of this invention is to provide a kind of low pressure flip-over type strut buckling well head shut-off valve.The trigger mechanism of this valve is designed according to the strut buckling principle, when pipeline pressure during lower than specified point, in the acting in conjunction down-pressed pole generation unstability of pipeline pressure and spring force, thereby trigger the shutoff of valve, the shutoff precision is high, and has saved the hydraulic control system of conventional valves.Simultaneously, the structure of valve itself is also very simple, only has two moving components, has very high reliability.
Technical scheme of the present invention is as follows:
A kind of low pressure flip-over type strut buckling well head shut-off valve, its critical piece comprises piston, valve body, flap, valve seat, block, valve rod, valve gap, spring, spring stop piece, elongate rod, bar cage, pole cap, bolt etc. resets.The operating principle of valve is described below: valve rod is subject to the acting in conjunction of three power, is respectively the support force of elongate rod, the pressure of piston and the thrust of spring.Wherein the direction of the pressure of the support force of elongate rod and piston is downwards, the thrust direction of spring upwards, these three equilibrium of forces and unbalance be the factor that triggers valve open and close.When manifold pressure, during higher than specified point, the axial force that elongate rod is born is lower than its strut buckling critical load, and it is stable that depression bar keeps.The thrust that these two downward power of the support force of elongate rod and the pressure of piston and spring make progress reaches balance, and fluid can flow through the cavity between flap and valve rod, and valve is in open mode.When the pressure in pipeline starts to descend, the pressure of piston also can descend thereupon, and spring force is constant, therefore the support force of elongate rod can increase along with the decline of pressure.When the pressure in pipeline is brought down below specified point, the load that elongate rod is born surpasses its strut buckling critical load, depression bar generation unstability, and its effective length can reduce moment.Now valve rod can move up under the thrust of spring, makes flap enter valve seat, thereby form the sealing valve-off, cuts off fluid.
Elongate rod is the trigger unit of low pressure flip-over type strut buckling well head shut-off valve, itself can the perception pipeline pressure whether lower than specified point, thereby and unstability occurs in loine pressure during lower than specified point and triggers closing of valve.Elongate rod and spring have replaced the hydraulic control system of the complexity used in current well mouth release valve on function.
Beneficial effect of the present invention is as follows:
1. low pressure flip-over type strut buckling well head shut-off valve adopts elongate rod as trigger unit, and the unstability of elongate rod is followed Euler's formula, makes the present invention have higher triggering precision;
2. low pressure flip-over type strut buckling well head shut-off valve is simple in structure, only has two moving component-valve rods and spring, and motion credibility and sealing reliability are higher;
3. the reseting procedure of low pressure flip-over type strut buckling well head shut-off valve after the closing Renewal process of elongate rod namely, the whole process operation time is short, and without special tool(s), simple.
The accompanying drawing explanation
The primary structure that accompanying drawing 1 is the low pressure flip-over type strut buckling well head shut-off valve that the present invention relates to;
The schematic diagram that accompanying drawing 2 is worked during higher than specified point at pressure for the low pressure flip-over type strut buckling well head shut-off valve that the present invention relates to;
The low pressure flip-over type strut buckling well head shut-off valve schematic diagram when pressure lower than specified point trigger shutoff of accompanying drawing 3 for the present invention relates to;
The schematic diagram that accompanying drawing 4 is the low pressure flip-over type strut buckling well head shut-off valve reseting procedure that the present invention relates to.
The specific embodiment
A kind of low pressure flip-over type strut buckling well head shut-off valve, its critical piece comprises piston 1, valve body 2, flap 3, valve seat 4, block 5, valve rod 6, valve gap 7, spring 8, spring stop piece 9, elongate rod 10, bar cage 11, pole cap 12, bolt 13 resets.As shown in Figure 1.Wherein elongate rod 10 is trigger units of low pressure flip-over type strut buckling well head shut-off valve, and the acting in conjunction of it and spring 8 has replaced the hydraulic control system of traditional well head shut-off valve on function.
The specific embodiment of the present invention is: the upper end of valve rod 6 is connected with elongate rod 10, and valve rod 6 passes spring 8, block 5 and flap 3 simultaneously, and is connected with piston 1 in lower end.The upper surface of piston 1 bears the pressure medium in valve body 2 chambeies, the soffit of piston 1 and external environment connect.Because the pressure in valve body 2 chambeies is greater than the environment stress outside chamber, making a concerted effort downwards of the pressure that piston 1 is subject to, produce downward pulling force effect to valve rod 6.8 pairs of valve rods 6 of spring have thrust upwards.10 pairs of valve rods 6 of elongate rod have downward support force effect.
When manifold pressure during higher than specified point, the support force that elongate rod 10 is born is lower than its strut buckling critical load, it is stable that depression bar keeps, the thrust that these two downward power of the pressure that the support force of elongate rod 10 and piston 1 are subject to and spring 8 make progress reaches balance, fluid can flow through the cavity between flap 3 and valve rod 6 and flow to downstream line, and valve is in open mode.As shown in Figure 2.
When the pressure in pipeline starts to descend, the downward pressure that piston 1 is subject to also can descend thereupon, and the power of spring 8 is constant, therefore the support force of elongate rod 10 can increase along with the decline of pressure.When the pressure in pipeline is brought down below specified point, when the axial load that elongate rod 10 is born surpasses its strut buckling critical load, depression bar generation unstability, its effective length can reduce moment.Now valve rod 6 can move up under the thrust of spring 8, makes flap 3 enter valve seat 4, forms sealing and the cut-out fluid, thus valve-off.As shown in Figure 3.
After system pressure recovers normally, can to low pressure flip-over type strut buckling well head shut-off valve, be resetted as follows: (1) closes the valve of upstream line; (2) bolt 13 that will reset takes off from hook, through the air vent below valve body 2, inserts the screwed hole of valve rod 6 lower ends, turns clockwise, until valve rod 6 is moved down into the position that can change elongate rod 10, as shown in Figure 4; (3) back out pole cap 12, take off the elongate rod that elongate rod 10 of unstability also more renews, tighten pole cap 12; (4) check errorless after, at first open the upstream line valve, and then the bolt 13 that will reset is rotated counterclockwise and takes off, hang and hang back hook, now low pressure flip-over type strut buckling well head shut-off valve has just reset to opening.
Disclosed all features in this manual, or the step in disclosed all methods or process, except the special type and/or step of mutual repulsion, all can combine by any way.
Disclosed arbitrary feature in this manual (comprising any accessory claim, summary and accompanying drawing), unless special narration all can be replaced by other equivalence or the alternative features with similar purpose.That is,, unless special narration, each feature is an example in a series of equivalences or similar characteristics.
The present invention is not limited to the aforesaid specific embodiment.The present invention expands to any new feature or any new combination disclosed in this manual, and the arbitrary new method disclosed or step or any new combination of process.
Claims (5)
1. a low pressure flip-over type strut buckling well head shut-off valve, its critical piece comprises piston (1), valve body (2), flap (3), valve seat (4), block (5), valve rod (6), valve gap (7), spring (8), spring stop piece (9), elongate rod (10), bar cage (11), pole cap (12), the bolt that resets (13), it is characterized in that: the parts whether the control shut-off valve turn-offs are elongate rod (10) and spring (8), by the strut buckling triggering valve shutoff of elongate rod (10).
2. low pressure flip-over type strut buckling well head shut-off valve according to claim 1, wherein the upper end of valve rod (6) is connected with elongate rod (10), valve rod (6) passes spring (8), block (5) and flap (3) simultaneously, and is connected with piston (1) in lower end.
3. low pressure flip-over type strut buckling well head shut-off valve according to claim 1, wherein the upper surface of piston (1) bears pressure medium in valve body (2) chamber, and soffit is communicated with ambient atmosphere.
4. low pressure flip-over type strut buckling well head shut-off valve according to claim 1, wherein when manifold pressure during higher than specified point, the load that elongate rod (10) is born is lower than its strut buckling critical load, it is stable that depression bar keeps, the thrust that these two downward power of the pressure that the support force of elongate rod 10 and piston 1 are subject to and spring 8 make progress reaches balance, fluid can flow through the cavity between flap and valve rod and flow to downstream line, and valve is in open mode.
5. low pressure flip-over type strut buckling well head shut-off valve according to claim 1, wherein when manifold pressure during lower than specified point, when the axial load that elongate rod (10) is born surpasses its strut buckling critical load, depression bar generation unstability, its effective length can reduce moment, and now valve rod (6) can move up under the thrust of spring (8), makes flap (3) enter valve seat (4), form sealing and cut off fluid, thus valve-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101865832A CN103470217A (en) | 2012-06-08 | 2012-06-08 | Low-voltage triggering type compression bar unstability wellhead shutdown valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101865832A CN103470217A (en) | 2012-06-08 | 2012-06-08 | Low-voltage triggering type compression bar unstability wellhead shutdown valve |
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| CN103470217A true CN103470217A (en) | 2013-12-25 |
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| CN2012101865832A Pending CN103470217A (en) | 2012-06-08 | 2012-06-08 | Low-voltage triggering type compression bar unstability wellhead shutdown valve |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2255617A (en) * | 1991-05-06 | 1992-11-11 | Julian S Taylor | High pressure fluid emergency shutoff valve. |
| US5373864A (en) * | 1992-07-30 | 1994-12-20 | Taylor; Julian S. | Downstream low fluid pressure emergency shutoff valve |
| US6058961A (en) * | 1999-09-14 | 2000-05-09 | Taylor; Julian S. | High pressure relief valve |
| WO2001075340A2 (en) * | 2000-03-30 | 2001-10-11 | Bs & B Safety Systems, Inc. | Cartridge assembly for valve |
| CN101263327A (en) * | 2005-09-09 | 2008-09-10 | Bs&B安全体系有限公司 | Pressure relief device |
| CN201866262U (en) * | 2010-12-06 | 2011-06-15 | 苏州德兰能源科技有限公司 | Stop valve |
| CN202001685U (en) * | 2010-12-29 | 2011-10-05 | 江村 | Pressure-bearing rod bell jar valve clack sealing type safety valve |
| CN202731837U (en) * | 2012-06-08 | 2013-02-13 | 刘海亮 | Low-pressure triggered pressure rod destabilization wellhead shut-off valve |
-
2012
- 2012-06-08 CN CN2012101865832A patent/CN103470217A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2255617A (en) * | 1991-05-06 | 1992-11-11 | Julian S Taylor | High pressure fluid emergency shutoff valve. |
| US5373864A (en) * | 1992-07-30 | 1994-12-20 | Taylor; Julian S. | Downstream low fluid pressure emergency shutoff valve |
| US6058961A (en) * | 1999-09-14 | 2000-05-09 | Taylor; Julian S. | High pressure relief valve |
| WO2001075340A2 (en) * | 2000-03-30 | 2001-10-11 | Bs & B Safety Systems, Inc. | Cartridge assembly for valve |
| CN101263327A (en) * | 2005-09-09 | 2008-09-10 | Bs&B安全体系有限公司 | Pressure relief device |
| CN201866262U (en) * | 2010-12-06 | 2011-06-15 | 苏州德兰能源科技有限公司 | Stop valve |
| CN202001685U (en) * | 2010-12-29 | 2011-10-05 | 江村 | Pressure-bearing rod bell jar valve clack sealing type safety valve |
| CN202731837U (en) * | 2012-06-08 | 2013-02-13 | 刘海亮 | Low-pressure triggered pressure rod destabilization wellhead shut-off valve |
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Address after: 100176 No. 2 North Yongchang Road, Beijing economic and Technological Development Zone Applicant after: Liu Hailiang Applicant after: Wang Lei Applicant after: Wang Fukai Address before: 100076 Beijing city Daxing District Jiugong Town Hall Road No. 15 No. 23 building 3 unit 1101 Applicant before: Liu Hailiang Applicant before: Wang Lei Applicant before: Wang Fukai |
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Effective date of registration: 20160225 Address after: 211316, No. 12 Tan Avenue, Gaochun Economic Development Zone, Nanjing, Jiangsu Applicant after: JIANGSU RUILANGBO MECHANICAL EQUIPMENT CO., LTD. Address before: 100176 No. 2 North Yongchang Road, Beijing economic and Technological Development Zone Applicant before: Liu Hailiang Applicant before: Wang Lei Applicant before: Wang Fukai |
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Application publication date: 20131225 |