CN1353261A - Pilot-type overflow valve - Google Patents
Pilot-type overflow valve Download PDFInfo
- Publication number
- CN1353261A CN1353261A CN 00126682 CN00126682A CN1353261A CN 1353261 A CN1353261 A CN 1353261A CN 00126682 CN00126682 CN 00126682 CN 00126682 A CN00126682 A CN 00126682A CN 1353261 A CN1353261 A CN 1353261A
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- China
- Prior art keywords
- valve
- guide
- pilot
- spool
- resistance
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Abstract
A pilot-type overflow valve features that an additional fixed liquid resistor is used in the pilot loop on the basis of a fixed liquid resistor and a variable liquid resistor that the original overflow valve has. Its advantages include high guide stability, low noise and high pressure precision and working efficiency of hydraulic system.
Description
The present invention relates to a kind of relief valve, particularly a kind of pilot operated compound relief valve.
At present, existing relief valve adopts half-bridge liquid resistance network structure more, it is by a fixer resistance and the liquid resistance network that variable liquid resistance is constituted, it has only a fixer resistance in the guide loop, pilot valve is a cone valve, between poppet valve core and valve seat, form variable liquid resistance, when spillway discharge increases, the aperture of poppet port and primary valve all will increase, spring force and steady-state fluid force increase, so inlet pressure must increase, and spillway discharge is big more, inlet pressure is also big more, so this valve has positive stable state override pressure.This kind relief valve can not hinder different its stable state override pressure, the bad adaptability of regulating arbitrarily of network parameter according to liquid.
The object of the present invention is to provide a kind of pilot operated compound relief valve, it can hinder the difference of network parameter according to liquid, changes the steady-state characteristic of pressure controlled valve.
The objective of the invention is to realize: pilot operated compound relief valve by following approach, it comprises main valve and is fixed on pilot valve on the main valve, the fixer resistance is arranged on the main valve, form variable liquid resistance between guide's spool and the guide's valve seat, this guide's spool front portion is taper, pyramidal front end has screw thread, and piston is fixed on guide's spool by nut and cone, above-mentioned guide's spool, piston, nut are formed the pilot valve core assembly, this pilot valve core assembly formerly moves freely in the guide valve seat, and the fixer resistance screw that has aperture has been installed in guide's valve body.
The present invention compared with prior art, its advantage is: 1. existing is that the relief valve of guide's control loop always exists positive stable state override pressure with half-bridge liquid resistance network, and the present invention is according to the difference of liquid resistance network parameter, and its stable state override pressure just can be, be zero, also can be for negative; 2. pilot valve core of the present invention has stable guiding, and pilot valve stability of motions is good, and noise is little; 3. override pressure is setting-pressure accuracy and the working efficiency that zero relief valve can improve hydraulic system; Pilot operated compound relief valve be at present widely used be the alternative of new generation of guide's relief valve of controlling network with liquid resistance half-bridge.
Below in conjunction with figure the present invention is described in further detail:
Fig. 1 is an overall structure schematic representation of the present invention;
Fig. 2 is the structural representation of pilot valve of the present invention and valve seat;
Fig. 3 is the schematic diagram of pilot operated compound relief valve of the present invention;
Fig. 4 is the schematic diagram of semibridge system relief valve in the prior art.
The pilot operated compound relief valve structure as shown in Figure 1 and Figure 2, this valve is made up of main valve 2 and pilot valve 3, pilot valve 3 is positioned at above the main valve 2, with four screws pilot valve 3 is fixed on the main valve 2, main valve 2 structures are identical with existing relief valve main valve, the fixer resistance screw 7 that has aperture has been installed in guide's valve body 4, central small hole plays inhibition to the fluid by pilot valve, guide's spool 8 left ends have screw thread, the right-hand member of screw thread is a cone, by nut 11 and cone piston 9 is fixed on guide's spool, piston 9 and guide's spool 8 are integral.Formerly the right-hand member of guide valve core is a poppet valve core, guide's spool 8, and piston 9, elastic washer 10, nut 11 is formed the pilot valve core assembly, and its structure is as shown in Figure 2.But the pilot valve core assembly is guide valve seat 5 interior move left and right formerly, and guide's valve seat 5 usefulness circlips are fixed in guide's valve body 4.
The working principle of this valve such as Fig. 3, it is by three liquid resistance R
1, R
2, R
3Constitute, wherein 1 is R
1, fixer resistance screw 7 is R
2, R
1, R
2Be the fixer resistance, the valve port between guide's spool 8 and the guide's valve seat 5 is R
3, R
3Be variable liquid resistance.Guide's spool 8 of this valve is subjected to liquid resistance R
2Two pressure P of front and back
2And P
3And the pilot valve spring force controls, and its working principle is as follows: when pilot valve is not opened, and liquid resistance R
1And R
2There is not fluid to flow through, P
1=P
2=P
3, work as P
1Rise, when making the hydraulic coupling that acts on the pilot valve left side reach the pilot valve spring force, pilot valve is opened, and fluid passes through R
1, R
2Flow back to fuel tank with poppet port, at this moment P
1＞P
2＞P
3, as pressure differential deltap P=P
1-P
3When reaching certain value, main valve open, most of flow makes the valve inlet pressure controlled from the primary valve overflow.
The basic structure of existing relief valve as shown in Figure 4, its guide loop has only fixer resistance a 1 (R
1), pilot valve is a cone valve, forms variable liquid resistance R between poppet valve core and guide's valve seat
3This liquid resistance network that is made of the resistance of fixer and variable liquid resistance hinders network half-bridge liquid, when spillway discharge increases, the aperture of poppet port and primary valve all will increase, spring force and steady-state fluid force increase, so inlet pressure must increase, and spillway discharge is big more, inlet pressure is also big more, so this valve has positive stable state override pressure.This valve is compared with existing relief valve, and its main distinction is that the guide loop has increased fixer resistance R
2, changed the structure of guide's spool, make guide's spool two ends P that is stressed
2And P
3Common control, the flow that guide's spool passes through are simultaneously also by liquid resistance R
1And R
2, at liquid resistance R
1And R
2On produce pressure drop Δ P respectively
1With Δ P
2, when the pilot valve flow increases, Δ P
1With Δ P
2All to increase Δ P
1Increase and make P
2Reduce, the power that acts on guide's spool left end reduces, Δ P
2Increase and make P
3Reduce, the power that acts on guide's spool right-hand member reduces, and poppet port is to increase or dwindle to depend on Δ P
1With Δ P
2The size of increment had both depended on R
1And R
2Size, when changing liquid resistance R
1Or R
2Orifice size the time, can make pilot operated compound relief valve present three kinds of different flow pressure characteristics.
Claims (1)
1. pilot operated compound relief valve, it comprises main valve [2] and is fixed on pilot valve [3] on the main valve [2], fixer resistance [1] is arranged on the main valve [2], form variable liquid resistance between guide's spool [8] and the guide's valve seat [5], it is characterized in that guide's spool [8] front portion is taper, pyramidal front end has screw thread, and piston [9] is fixed on guide's spool [8] by nut [11] and cone, above-mentioned guide's spool [8], piston [9], nut [11] is formed pilot valve core assembly [15], this pilot valve core assembly [15] formerly moves freely in the guide valve seat [5], and the fixer resistance screw [7] that has aperture has been installed in guide's valve body [4].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00126682 CN1111259C (en) | 2000-11-14 | 2000-11-14 | Pilot-type overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00126682 CN1111259C (en) | 2000-11-14 | 2000-11-14 | Pilot-type overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1353261A true CN1353261A (en) | 2002-06-12 |
| CN1111259C CN1111259C (en) | 2003-06-11 |
Family
ID=4591982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00126682 Expired - Fee Related CN1111259C (en) | 2000-11-14 | 2000-11-14 | Pilot-type overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1111259C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352874A (en) * | 2011-10-31 | 2012-02-15 | 浙江大学 | Digital pure water hydraulic proportional overflow valve |
| CN105605263A (en) * | 2015-11-04 | 2016-05-25 | 中国人民解放军后勤工程学院 | Pilot control branch pipeline flow stabilization regulation apparatus |
| CN108180185A (en) * | 2017-11-08 | 2018-06-19 | 中国航空工业集团公司金城南京机电液压工程研究中心 | A kind of pilot-operated type deadweight safety valve |
| CN110469703A (en) * | 2019-08-12 | 2019-11-19 | 王平武 | A kind of high sensitivity pilot operated compound relief valve |
| CN112610555A (en) * | 2020-12-26 | 2021-04-06 | 哈尔滨工业大学 | Quick-closing slow-opening type hydraulic priority valve |
Families Citing this family (1)
| 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 |
-
2000
- 2000-11-14 CN CN 00126682 patent/CN1111259C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352874A (en) * | 2011-10-31 | 2012-02-15 | 浙江大学 | Digital pure water hydraulic proportional overflow valve |
| CN102352874B (en) * | 2011-10-31 | 2013-12-25 | 浙江大学 | Digital pure water hydraulic proportional overflow valve |
| CN105605263A (en) * | 2015-11-04 | 2016-05-25 | 中国人民解放军后勤工程学院 | Pilot control branch pipeline flow stabilization regulation apparatus |
| CN108180185A (en) * | 2017-11-08 | 2018-06-19 | 中国航空工业集团公司金城南京机电液压工程研究中心 | A kind of pilot-operated type deadweight safety valve |
| CN108180185B (en) * | 2017-11-08 | 2019-11-15 | 中国航空工业集团公司金城南京机电液压工程研究中心 | A kind of pilot-operated type deadweight safety valve |
| CN110469703A (en) * | 2019-08-12 | 2019-11-19 | 王平武 | A kind of high sensitivity pilot operated compound relief valve |
| CN112610555A (en) * | 2020-12-26 | 2021-04-06 | 哈尔滨工业大学 | Quick-closing slow-opening type hydraulic priority valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1111259C (en) | 2003-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| AR01 | Abandonment of patent right to avoid double patenting |
According to article 9 of the patent law and article 13 of the detailed rules for the implementation of the patent law: 126682.9 of the invention patents in the current issue of authorization announcement, and at the same time corresponding to the 225961.3 utility model patent to be given up, and in the 19 volume of the 24 issue of the new type of communique on the patent right to abandon the announcement. |
|
| 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 |