CN2804526Y - Pilot overflow valve - Google Patents
Pilot overflow valve Download PDFInfo
- Publication number
- CN2804526Y CN2804526Y CN 200520050135 CN200520050135U CN2804526Y CN 2804526 Y CN2804526 Y CN 2804526Y CN 200520050135 CN200520050135 CN 200520050135 CN 200520050135 U CN200520050135 U CN 200520050135U CN 2804526 Y CN2804526 Y CN 2804526Y
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- CN
- China
- Prior art keywords
- valve
- pilot
- piston
- cone
- control piston
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- Expired - Fee Related
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Abstract
The utility model relates to a pilot overflow valve, which comprises a main valve and a pilot valve fixed on the main valve, the main valve is provided with a fixing liquid resistor R1, one end of a pilot valve seat [10] is a provided with a cone valve port, the middle part is provided with a piston hole, and the other end is fixed with a plug [8]; the control piston [9] and the pilot cone valve [11] are in separate structure; the control piston [9] can freely move in the piston hole of the pilot valve seat [10]; the control piston [9] is provided with a radial hole, and the inside thereof is provided with a fixing liquid resistor R2; the pilot cone valve [11] is installed on the cone valve port of the pilot valve seat [10]. The pilot valve structure of the pilot overflow valve of the utility model can is simple, the processing manufacturability is good and the technical performance is easily ensured.
Description
Technical field
The utility model relates to a kind of pilot operated compound relief valve.
Background technique
State Intellectual Property Office has announced Chinese utility model patent " the pilot operated compound relief valve " (patent No. 00225961.3 September 26 calendar year 2001, notification number 2450424), its structure as shown in Figure 4, the cone valve of this valve and piston are integral structure, this structural design makes piston and cone valve two-stage be strict with concentric man-hour adding, increased technology difficulty, incorporate in addition structure causes the runner more complicated of pilot valve, and the height of pilot valve is also higher.
Summary of the invention
The purpose of this utility model is to provide a kind of difficulty of processing little, simple in structure pilot operated compound relief valve.
The purpose of this utility model is achieved through the following channels: pilot operated compound relief valve, it comprises main valve and is fixed on pilot valve on the main valve, fixer resistance R1 is arranged on the main valve, guide's valve seat 10 1 ends are the cone valve mouth, the middle part is a piston hole, the other end is fixed with plug 8, control piston 9 is a separation structure with pilot poppet valve 11, control piston 9 is the interior unrestricted motion of piston hole of guide valve seat 10 formerly, open radial hole on the control piston 9, its inside is equipped with fixer resistance R2, and pilot poppet valve 11 is installed in the cone valve mouth of guide's valve seat 10.The cone valve head of described pilot poppet valve 11 is a cylindrical structure.
The utility model pilot operated compound relief valve compared with prior art, its advantage is:
1. pilot poppet valve and piston are separation structure, thereby have avoided the strict concentric processing technology requirement of piston and cone valve two-stage, and the technology capability of the utility model pilot valve is good, and quality of product is guaranteed easily.
2. fixer resistance R2 is directly installed on the piston middle part, and the runner of the utility model pilot valve is simplified, and has reduced the height of pilot valve.
3. pilot valve technology for assembling of the prior art is relatively poor, before the pilot valve assembled, its piston is wanted to unload from poppet valve core earlier, and cone valve is inserted guide's valve seat from the right, piston is inserted on the guiding awl of cone valve from the left side, bore in the guiding of cone valve with nut check.The cone valve of the utility model relief valve, piston are separation structure, and be easy for installation.
4. the utility model pilot operated compound relief valve and the background technique guide loop of being adopted all is G type π bridge liquid resistance networks, its stable state override pressure is almost nil, but because the pilot valve structure of the utility model pilot operated compound relief valve is simpler, its technology capability is good, technical performance guarantees easily, thereby the better application prospect is arranged.
Description of drawings
Below in conjunction with accompanying drawing the utility model is described in further detail:
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model overall structure schematic representation;
Fig. 3 is the utility model working principle schematic representation;
Fig. 4 is the overall structure schematic representation of existing valve.
Embodiment
As shown in Figure 1 and Figure 2, the utility model pilot operated compound relief valve is made up of main valve and pilot valve, and main valve mainly comprises main valve body 1, main valve seat 2, main valve plug 3 and main spool spring 4, and pilot valve mainly comprises pilot valve assembly 5, pilot valve spring 6 and guide's valve body 7.Pilot valve is positioned at above the main valve, with four screws pilot valve is fixed on the main valve, and the main valve structure is identical with existing relief valve main valve.The pilot valve assembly is installed in guide's valve body 7, its structure as shown in Figure 2, the pilot valve assembly is by preventing that piston from skidding off the plug 8 of guide's valve seat, control piston 9, the fixer resistance R2, guide's valve seat 10 and the pilot poppet valve 11 that are fixed in the piston with screw thread are formed.Control piston 9 formerly can be free to slide in the guide valve seat 10, and guide's valve seat is fixed in guide's valve body 7 with circlip.
As shown in Figure 1 and Figure 2, guide's valve seat 10 1 ends of the utility model pilot operated compound relief valve are the cone valve mouth, the middle part is a piston hole, the other end is fixed with plug 8, and control piston 9 is a separation structure with pilot poppet valve 11, and control piston 9 is the interior unrestricted motion of piston hole of guide valve seat 10 formerly, open radial hole on the control piston 9, its inside is equipped with fixer resistance R2, and pilot poppet valve 11 is installed in the cone valve mouth of guide's valve seat 10, and the cone valve head of described pilot poppet valve 11 is a cylindrical structure.
The working principle of this valve as shown in Figure 3, the guide loop is made of the resistance of 3 liquid R1, R2, R3, wherein R1 is arranged on the main valve side, R2 is arranged on the inside of control piston 9, R1 and R2 are the fixer resistance, and the valve port between pilot poppet valve 11 and the guide's valve seat 10 is R3, and R3 is variable liquid resistance.The control piston of this valve is subjected to two pressure P 2 and the P3 effect before and after the liquid resistance R2, because P2＞P3, so an end of control piston 9 and pilot poppet valve 11 conehead ends are against contacting, the thrust of pilot poppet valve 11 controlled pistons 9, the pilot valve spring force, steady-state fluid force control, this relief valve working principle is as follows: when pilot valve is not opened, liquid resistance R1 and R2 do not have fluid to flow through, P1=P2=P3, when P1 rises, when making the hydraulic coupling that acts on pilot poppet valve 11 left sides reach the pilot valve spring force, pilot valve is opened, fluid passes through R1, R2 and pilot poppet valve mouth flow back to fuel tank, this moment P1＞P2＞P3, control piston 9 contact with pilot poppet valve 11, the thrust that acts on the control piston 9 is passed through pilot valve spring force realization balance.When pressure differential deltap P=P1-P3 reaches certain value, main valve open, most of flow makes the valve inlet pressure controlled from the primary valve overflow.
Claims (2)
1. pilot operated compound relief valve, it comprises main valve and is fixed on pilot valve on the main valve, fixer resistance R1 is arranged on the main valve, it is characterized in that guide's valve seat [10] one ends are the cone valve mouth, the middle part is a piston hole, the other end is fixed with plug [8], control piston [9] is a separation structure with pilot poppet valve [11], control piston [9] is the interior unrestricted motion of piston hole of guide valve seat [10] formerly, control piston is opened radial hole on [9], its inside is equipped with fixer resistance R2, and pilot poppet valve [11] is installed in the cone valve mouth of guide's valve seat [10].
2. pilot operated compound relief valve as claimed in claim 1, the cone valve head that it is characterized in that described pilot poppet valve [11] is a cylindrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520050135 CN2804526Y (en) | 2005-01-21 | 2005-01-21 | Pilot overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520050135 CN2804526Y (en) | 2005-01-21 | 2005-01-21 | Pilot overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2804526Y true CN2804526Y (en) | 2006-08-09 |
Family
ID=36909818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520050135 Expired - Fee Related CN2804526Y (en) | 2005-01-21 | 2005-01-21 | Pilot overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2804526Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103089728A (en) * | 2011-11-02 | 2013-05-08 | 广西柳工机械股份有限公司 | Differential type pilot overflow valve |
-
2005
- 2005-01-21 CN CN 200520050135 patent/CN2804526Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103089728A (en) * | 2011-11-02 | 2013-05-08 | 广西柳工机械股份有限公司 | Differential type pilot overflow valve |
| CN103089728B (en) * | 2011-11-02 | 2016-03-16 | 广西柳工机械股份有限公司 | Differential type pilot 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 |