CN203322413U - Two-stage pressure unloading valve - Google Patents
Two-stage pressure unloading valve Download PDFInfo
- Publication number
- CN203322413U CN203322413U CN2013203587329U CN201320358732U CN203322413U CN 203322413 U CN203322413 U CN 203322413U CN 2013203587329 U CN2013203587329 U CN 2013203587329U CN 201320358732 U CN201320358732 U CN 201320358732U CN 203322413 U CN203322413 U CN 203322413U
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- China
- Prior art keywords
- valve
- valve body
- piston
- valve seat
- seat
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- Expired - Fee Related
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Abstract
The utility model discloses a two-stage pressure unloading valve which comprises a valve body, a valve seat, a valve sleeve and a main valve core, wherein the valve seat is mounted at the front end of the valve body; an axial oil inlet and radial oil outlets are formed in the front end of the valve seat; the main valve core is arranged inside the valve seat in a sliding manner; a throttling hole is formed in the main valve core; a reset spring is arranged between the main valve core and the valve body inside the valve seat; a poppet valve seat and a poppet valve core are internally arranged at the front end of the valve body; a radial unloading hole is formed in a part of the valve body positioned at the rear part of the poppet valve seat; the valve sleeve is mounted inside the valve body; a piston is mounted inside an inner hole of the valve sleeve; a step is arranged in the middle of the piston; a pressure adjusting spring is arranged between the piston and the poppet valve core; a sealing piece is arranged at the rear end of the valve sleeve; a pressure adjusting oil hole communicated with the inner cavity of the valve body is further formed in the valve body; a middle oil hole for communicating the valve body inner cavity with the piston middle step is formed in the valve sleeve; an inner oil hole for communicating a valve sleeve inner hole at the rear part of the piston with the middle step is formed in the piston. The two-stage pressure unloading valve has the advantages that the unloading pressure range is wider and the application range is wide.
Description
Technical field
The utility model relates to a kind of unloading valve.
Background technique
Existing unloading valve comprises valve body, valve seat, valve pocket, spool etc., and valve seat is provided with filler opening and oil outlet; When system pressure surpasses certain value, spool is opened, and filler opening and oil outlet communicate, and reach the purpose of off-load; But this unloading valve is the first class pressure unloading valve, and the pressure range of its setting is narrower, restricted application.
The model utility content
The purpose of this utility model is for the prior art above shortcomings, and a kind of two stage pressure unloading valves are provided, and it has advantages of that the pressure unloading scope is wider, applied widely.
For achieving the above object, two stage pressure unloading valves of the present utility model, comprise valve body, valve seat, valve pocket, main valve plug, it is characterized in that valve seat is loaded on the valve body front end, the valve seat front end is provided with axial filler opening and oil outlet radially, main valve plug slides and is located in valve seat, is provided with throttle orifice in main valve plug, between the valve body in main valve plug and valve seat, is provided with Returnning spring; Establish poppet valve seat and poppet valve core in the front end of valve body, be provided with pressure relief vent radially in the valve body at poppet valve seat rear, valve pocket is loaded in valve body, one piston is loaded in the endoporus of valve pocket, the piston middle part is provided with step, be provided with pressure adjusting spring between piston and poppet valve core, rear end at valve pocket is provided with Sealing, also be provided with the pressure regulation oilhole communicated with its inner chamber in valve body, be provided with the middle oilhole of connecting valve intracoelomic cavity and piston middle bench in valve pocket, be provided with the interior oilhole that is communicated with its rear valve pocket endoporus and middle bench in piston.
During use, pressure oil, through the throttle orifice of main valve plug, enters the valve base cavity in valve body the place ahead, and main valve plug tightly is pressed against on valve seat, also acts on poppet valve core simultaneously; When the pressure that acts on poppet valve core when pressure oil surpasses the thrust of pressure adjusting spring, hydraulic oil flows through the throttle orifice of main valve plug, push poppet valve core open, then flow to the oil outlet place by pressure relief vent, the unlatching of poppet valve core makes the valve base cavity pressure drop in valve body the place ahead and main valve plug is opened, like this, the pressure oil at filler opening place directly flows in oil outlet, and this is the first class pressure off-load; When pilot pressure is entered by the pressure regulation oilhole in valve body, promote piston forward side and move, pressure adjusting spring is pressurized again, makes the elastic force of pressure adjusting spring increase, and like this, the setting pressure of release just raises, and realizes higher two-stage unloading pressure, applied widely;
As further improvement of the utility model, on the valve body at valve seat rear, be provided with cushion rubber; Can prevent that valve seat and valve body from producing shock;
As further improvement of the utility model, be provided with the installation screw thread on valve body; Can realize the plug-in type installation of unloading valve;
In sum, the utlity model has pressure unloading scope advantage wider, applied widely, easy for installation.
The accompanying drawing explanation
The plan view that Fig. 1 is the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, this two stage pressures unloading valve, comprise valve body 1, valve seat 2, valve pocket 3, main valve plug 4, valve seat 2 is loaded on valve body 1 front end, on the valve body 1 at valve seat 2 rears, is provided with cushion rubber 5, is provided with on valve body 1 screw thread 1a is installed, valve seat 2 front ends are provided with axial filler opening 2a and oil outlet 2b radially, main valve plug 4 slides and is located in valve seat 2, is provided with throttle orifice 4a in main valve plug 4, between the valve body 1 in main valve plug 4 and valve seat 2, is provided with Returnning spring 6, establish poppet valve seat and poppet valve core 7 in the front end of valve body 1, be provided with pressure relief vent 8 radially in the valve body 1 at poppet valve seat rear, valve pocket 3 is loaded in valve body 1 by screw thread, one piston 9 is loaded in the endoporus of valve pocket 3, piston 9 middle parts are provided with step, be provided with pressure adjusting spring 10 between piston 9 and poppet valve core 7, be provided with the bolt 14 as Sealing in the rear end of valve pocket 3, also be provided with the pressure regulation oilhole 11 communicated with its inner chamber in valve body 1, be provided with the middle oilhole 12 of connecting valve intracoelomic cavity and piston middle bench in valve pocket 3, be provided with the interior oilhole 13 that is communicated with its rear valve pocket endoporus and middle bench in piston 9.
During use, pressure oil passes through the throttle orifice 4a of main valve plug 4, enters the valve base cavity in valve body 1 the place ahead, and main valve plug 4 tightly is pressed against on filler opening 2 a of valve seat 2, and also pressure oil acts on poppet valve core 7 simultaneously; When the pressure that acts on poppet valve core 7 when pressure oil surpasses the thrust of pressure adjusting spring 10, hydraulic oil flows through the throttle orifice 4a of main valve plug 4, push poppet valve core 7 open, then flow to oil outlet 2b place by pressure relief vent 8, the unlatching of poppet valve core 7 makes the valve base cavity pressure drop in valve body 1 the place ahead and main valve plug 4 is opened, like this, the pressure oil at filler opening 2a place directly flows in oil outlet 2b, and this is the first class pressure off-load; When pilot pressure oil is entered by the pressure regulation oilhole 11 in valve body 1, promoting piston 9 through middle oilhole 12, interior oilhole 13 forwards moves, pressure adjusting spring 10 is pressurized again, make the elastic force of pressure adjusting spring 10 increase, like this, the setting pressure of release just raises, and realizes higher two-stage unloading pressure, and Applicable scope is wider.
Claims (3)
1. a stage pressure unloading valve, comprise valve body, valve seat, valve pocket, main valve plug, it is characterized in that valve seat is loaded on the valve body front end, the valve seat front end is provided with axial filler opening and oil outlet radially, main valve plug slides and is located in valve seat, be provided with throttle orifice in main valve plug, between the valve body in main valve plug and valve seat, be provided with Returnning spring; Establish poppet valve seat and poppet valve core in the front end of valve body, be provided with pressure relief vent radially in the valve body at poppet valve seat rear, valve pocket is loaded in valve body, one piston is loaded in the endoporus of valve pocket, the piston middle part is provided with step, be provided with pressure adjusting spring between piston and poppet valve core, rear end at valve pocket is provided with Sealing, also be provided with the pressure regulation oilhole communicated with its inner chamber in valve body, be provided with the middle oilhole of connecting valve intracoelomic cavity and piston middle bench in valve pocket, be provided with the interior oilhole that is communicated with its rear valve pocket endoporus and middle bench in piston.
2. two stage pressure unloading valves as claimed in claim 1, is characterized in that being provided with cushion rubber on the valve body at valve seat rear.
3. two stage pressure unloading valves as claimed in claim 1 or 2, is characterized in that being provided with the installation screw thread on valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203587329U CN203322413U (en) | 2013-06-21 | 2013-06-21 | Two-stage pressure unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203587329U CN203322413U (en) | 2013-06-21 | 2013-06-21 | Two-stage pressure unloading valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203322413U true CN203322413U (en) | 2013-12-04 |
Family
ID=49661765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203587329U Expired - Fee Related CN203322413U (en) | 2013-06-21 | 2013-06-21 | Two-stage pressure unloading valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203322413U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104712798A (en) * | 2013-12-12 | 2015-06-17 | 天津帝广机电设备有限公司 | Combined pressure relief valve |
| CN106545537A (en) * | 2015-09-22 | 2017-03-29 | 无锡市德美嘉机械科技有限公司 | A kind of stroking mechanism of hydraulic servo variable pump |
| CN107906236A (en) * | 2017-11-21 | 2018-04-13 | 嘉善海力达工具有限公司 | Anti-leak speed limit relief arrangement |
| CN109424771A (en) * | 2017-09-01 | 2019-03-05 | 欧地公司 | Twin-stage relief valve |
-
2013
- 2013-06-21 CN CN2013203587329U patent/CN203322413U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104712798A (en) * | 2013-12-12 | 2015-06-17 | 天津帝广机电设备有限公司 | Combined pressure relief valve |
| CN104712798B (en) * | 2013-12-12 | 2017-04-19 | 天津帝广机电设备有限公司 | Combined pressure relief valve |
| CN106545537A (en) * | 2015-09-22 | 2017-03-29 | 无锡市德美嘉机械科技有限公司 | A kind of stroking mechanism of hydraulic servo variable pump |
| CN106545537B (en) * | 2015-09-22 | 2018-08-10 | 江苏汉力士液压制造有限公司 | A kind of stroking mechanism of hydraulic servo variable pump |
| CN109424771A (en) * | 2017-09-01 | 2019-03-05 | 欧地公司 | Twin-stage relief valve |
| CN107906236A (en) * | 2017-11-21 | 2018-04-13 | 嘉善海力达工具有限公司 | Anti-leak speed limit relief arrangement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20180621 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |