CN2242988Y - Guiding-type safety valve - Google Patents
Guiding-type safety valve Download PDFInfo
- Publication number
- CN2242988Y CN2242988Y CN 96202014 CN96202014U CN2242988Y CN 2242988 Y CN2242988 Y CN 2242988Y CN 96202014 CN96202014 CN 96202014 CN 96202014 U CN96202014 U CN 96202014U CN 2242988 Y CN2242988 Y CN 2242988Y
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- Prior art keywords
- valve
- main
- main valve
- pilot
- plug
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- Expired - Fee Related
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Abstract
The utility model relates to a guiding type safety valve which is suitable for the pressure control and the overload protection of the hydraulic bracket of a working face under the condition that a top plate sharp sinks underground in coal mines. The guiding type safety valve comprises a main valve and a guiding valve which is a direct-acting safety valve structure, and the main valve comprises a main valve core 6, a valve pad seat 1, a valve body 3 and a main valve spring 7. A damping hole on the main valve core and the opening of the valve core of the guiding valve form a control liquid path, and a valve pad 2 is arranged between the main valve core and the valve pad seat. The main valve core and the valve pad form an overflow main path, and a sealing ring is arranged between the main valve core and the valve body. The guiding type safety valve has good sealing performance, large overflow quantity, etc., and the pressure of a hydraulic system becomes small when the guiding type safety valve is operated.
Description
The utility model relates to a kind of Pilot operated safety valve, and being applicable to has sharply the sink pressure control and the overload protection of working surface hydraulic support of situation of top board under the coal mine.Form by pilot valve and main valve.
Colliery hydraulic support on underground working surface safety valve is the control and the protecting component of hydraulic support.Its effect is the constant hydraulic coupling that guarantees to keep when crushing in the column chamber, thereby makes support have the constant-resistance characteristic, and protects hydraulic support and column when overload.In that the working surface of bump is arranged, when top board sinks suddenly, require safety valve to have big spillway discharge could guarantee the unlikely damage of hydraulic support.Existing hydraulic support safety valve all is a direct-acting type, because the restriction of structure is when flow greatly the time, spring force is very big, and helical spring even belleville spring are all not competent.Though the nitrogen spring performance is fine, this safety valve easily leaks gas, and therefore poor reliability is not used widely.Pilot operated compound relief valve shown in Figure 1 is made up of pilot valve and main valve, is used for oily medium pressurized oil system.Pilot valve is used to regulate the pressure of main valve epicoele.Main valve is a cone valve, the hydraulic action of main valve plug epicoele balances each other with the hydraulic action of cavity of resorption together with spring force, when fluid pressure during greater than the spring force of pilot valve, pilot valve is opened, this moment, damping hole had oil flow, the piston upper and lower cavity produces pressure difference, and main valve is opened and overflow, and system pressure is kept constant.Owing to introduced the control oil pressure at the main valve piston epicoele, so main spool spring power only plays the main valve reset response, the spring force of employing can reduce greatly.The spillway discharge of pilot valve is very little, and then the spring force of pilot valve is also not too big.So above-mentioned pilot operated compound relief valve can be adapted to big flow.But its deficiency is: be hard contact seal between valve core of main valve and the valve seat.By the oil clearance sealing, only be applicable to oily working medium between spool and the valve body, allow the situation of a small amount of seepage.And hydraulic support is to be working medium with the emulsified liquid, and hard contact and clearance seal can't satisfy a long-time requirement of not leaking.
The purpose of this utility model is: overcome the deficiencies in the prior art part, provide a kind of and can be applicable to emulsifiable solution medium, the large-flow-rate pilot formula safety valve of good seal performance.
The purpose of this utility model can reach by following measure:
The end face seal that changes the valve core of main valve and the hard contact seal between the valve seat of above-mentioned pilot operated compound relief valve into valve pad and spool; Clearance seal between valve body and the spool changed into seal ring seal.
The utility model compared with prior art has following advantage:
1. the utility model is compared with existing pilot operated compound relief valve, and good seal performance can realize that long-term one does not leak, and therefore can be used for the emulsified liquid is the hydraulic support of medium.
2. the utility model is compared with existing hydraulic support safety valve, and spillway discharge can improve greatly.The needs of big spillway discharge release in the time of can satisfying working surface and press suddenly.
3. the utility model is compared with existing hydraulic support safety valve, and hydraulic system hydraulic pressure changes less during valve events.
4. only pilot valve work when slowly sinking owing to top board, main valve just moves (this situation number of times seldom) when having only top board sharply to sink, and is therefore very low to the life requirements of main valve.
The utility model is described in further detail below in conjunction with embodiment:
Referring to Fig. 2.Pilot operated safety valve is made up of main valve and pilot valve.Pilot valve is the direct-acting type safety valve structure.Main valve comprises main valve plug 6, valve seat cushion 1, valve body 3, main spool spring 7.Valve pad 2 is arranged between main valve plug and valve seat cushion.Valve pad is the high-strength rubber pad.Form the overflow main passage by main valve plug and valve pad.The 8th, pilot valve core, the 9th, pilot valve spring.Seal ring 5 is arranged between main valve plug and valve body.The damping hole 4 on the main valve plug and the valve core opening of pilot valve are formed control channel, form control sap cavity C on the right side of main valve plug.A chamber, main valve plug left side communicates with the column cylinder body liquid road of hydraulic support.The B mouth is the flow-off of main valve.The D mouth is the flow-off of pilot valve.
When top board slowly sank, fluid pressure raise in the column cylinder body, and liquid enters the C chamber by the damping hole on the main valve plug, and when pressure surpassed the set pressure of pilot valve, liquid was discharged by pilot valve, keeps the column constant-resistance.This moment is less by the flow of damping hole, and damping hole both sides pressure reduction is less, and deficiency is so that the main valve plug action.Still combustion sealing between main valve plug and the valve pad.
When top board sharply sinks, the column cylinder interior pressure sharply raises, after the fluid flow that pilot valve discharges acquires a certain degree, the pressure difference of main valve plug both sides strengthens, the hydraulic pressure in A chamber moves to right main valve plug to active force, main spool spring power and the frictional force of main valve plug to leave valve pad in main valve plug clothes D chamber, the right side hydraulic pressure of making every effort to overcome to the right, form the main passage overflow, fast big flow discharges liquid in the column cylinder body.Thereby play the effect of overload protection.
Claims (3)
1. Pilot operated safety valve; be applicable to sharply the sink pressure control and the overload protection of working surface hydraulic support of situation of top board arranged under the coal mine; form by main valve and pilot valve; pilot valve is the direct-acting type safety valve structure; main valve comprises main valve plug (6); valve seat cushion (1); valve body (3); main spool spring (7); the damping hole (4) on the main valve plug (6) and the valve core opening of pilot valve are formed control liquid road; it is characterized in that between main valve plug (6) and valve seat cushion (1), valve pad (2) being arranged; main valve plug (6) and valve pad (2) are formed the overflow main passage; between main valve plug (6) and valve body (3), seal ring (5) is arranged; form control sap cavity (C) on the right side of main valve plug (6), chamber, the left side of main valve plug (A) communicates with the column cylinder body liquid road of hydraulic support.
2. Pilot operated safety valve as claimed in claim 1 is characterized in that main valve and safety valve can be assembled into an integral body or separately.
3. Pilot operated safety valve as claimed in claim 1 or 2 is characterized in that valve pad (2) makes for the high-strength rubber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96202014 CN2242988Y (en) | 1996-02-08 | 1996-02-08 | Guiding-type safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96202014 CN2242988Y (en) | 1996-02-08 | 1996-02-08 | Guiding-type safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2242988Y true CN2242988Y (en) | 1996-12-18 |
Family
ID=33888124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96202014 Expired - Fee Related CN2242988Y (en) | 1996-02-08 | 1996-02-08 | Guiding-type safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2242988Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366967C (en) * | 2004-04-21 | 2008-02-06 | 华中科技大学 | Leading type water pressure overflow valve |
| CN101929481A (en) * | 2010-04-30 | 2010-12-29 | 北京联合大学 | Three-way pressure compensating valve for hydraulic energy-saving system |
| CN102454652A (en) * | 2011-11-18 | 2012-05-16 | 广西柳工机械股份有限公司 | Adjustable hydraulic pilot opening mechanism |
| CN105971959A (en) * | 2016-06-25 | 2016-09-28 | 玉环县现代工具有限公司 | Differential pressure type unloading safety valve |
| CN107345485A (en) * | 2017-07-25 | 2017-11-14 | 山东科技大学 | Hydraulic support pilot operated safety valve |
| CN108591549A (en) * | 2018-06-01 | 2018-09-28 | 江苏安普阀门机械有限公司 | A kind of deep fat overflow valve |
-
1996
- 1996-02-08 CN CN 96202014 patent/CN2242988Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366967C (en) * | 2004-04-21 | 2008-02-06 | 华中科技大学 | Leading type water pressure overflow valve |
| CN101929481A (en) * | 2010-04-30 | 2010-12-29 | 北京联合大学 | Three-way pressure compensating valve for hydraulic energy-saving system |
| CN102454652A (en) * | 2011-11-18 | 2012-05-16 | 广西柳工机械股份有限公司 | Adjustable hydraulic pilot opening mechanism |
| CN102454652B (en) * | 2011-11-18 | 2014-05-07 | 广西柳工机械股份有限公司 | Adjustable hydraulic pilot opening mechanism |
| CN105971959A (en) * | 2016-06-25 | 2016-09-28 | 玉环县现代工具有限公司 | Differential pressure type unloading safety valve |
| WO2017219876A1 (en) * | 2016-06-25 | 2017-12-28 | 玉环县现代工具有限公司 | Differential pressure unloading safety valve |
| CN107345485A (en) * | 2017-07-25 | 2017-11-14 | 山东科技大学 | Hydraulic support pilot operated safety valve |
| CN108591549A (en) * | 2018-06-01 | 2018-09-28 | 江苏安普阀门机械有限公司 | A kind of deep fat overflow valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |