CN203926201U - Load-sensitive pressure cut off control valve - Google Patents
Load-sensitive pressure cut off control valve Download PDFInfo
- Publication number
- CN203926201U CN203926201U CN201420250492.5U CN201420250492U CN203926201U CN 203926201 U CN203926201 U CN 203926201U CN 201420250492 U CN201420250492 U CN 201420250492U CN 203926201 U CN203926201 U CN 203926201U
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- CN
- China
- Prior art keywords
- oil duct
- load
- control valve
- spool
- pressure cut
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a kind of load-sensitive pressure cut off control valve, include valve body, in valve body, laterally have oil duct, lower oil duct, middle oil duct, middle oil duct is respectively by vertical first passage, second channel and upper oil duct, lower oil duct is connected, middle oil duct, first passage, second channel outer end is provided with screw plug, upper oil duct, in lower oil duct, be provided with spool, upper oil duct, lower oil duct front end has mounting hole, lower mounting hole, this load-sensitive pressure cut off control valve has Power Limitation effect, permanent power and pressure cut off are controlled the maximal input of the pump of limit of functions, load-sensitive control valve need to arbitrfary point work within the scope of this envelope according to load.
Description
Technical field
The utility model relates to control valve field, specifically belongs to load-sensitive pressure cut off control valve.
Background technique
Load sensitive system is a kind of system pressure-traffic demand of experiencing, and the oil hydraulic circuit of required flow and pressure is only provided.The intact device that realizes load-sensitive control is comprised of following element: first need a Variable plunger pump, this pump has a pressure compensator, and when system is not worked, compensator can be in the lower small flow working state that keeps of lower pressure (200PSI).When system proceeds to working state, the traffic demand of compensator impression system also provides adjustable flow according to traffic demand when system condition changes.Meanwhile, the pressure demand of hydraulic system will be experienced and respond to oil hydraulic pump also.Most hydraulic systems are not worked under constant pressure, when external load changes, the working pressure of hydraulic system is different, simultaneously, this control valve is integrated constant-pressure variable function also, when system pressure reaches the pressure that pressure cut off control to set, the flow of pump can constantly decline and pressure remains unchanged substantially.
Model utility content
The purpose of this utility model is to provide a kind of load-sensitive pressure cut off control valve, because being greater than small end, the active area of the large end of flow piston make flow piston move and realize pump delivery and be reduced to delivery side of pump flow and only can maintain and set up the state of equilibrium of setting pressure reduction to small end, this load-sensitive pressure cut off control valve has Power Limitation effect, permanent power and pressure cut off are controlled the maximal input of the pump of limit of functions, and load-sensitive control valve need to arbitrfary point work within the scope of this envelope according to load.
The technical solution of the utility model is as follows:
Load-sensitive pressure cut off control valve, include valve body, in valve body, laterally have oil duct, lower oil duct, middle oil duct, middle oil duct is respectively by vertical first passage, second channel and upper oil duct, lower oil duct is connected, middle oil duct, first passage, second channel outer end is provided with screw plug, upper oil duct, in lower oil duct, be provided with spool, upper oil duct, lower oil duct front end has mounting hole, lower mounting hole, upper mounting hole, in lower mounting hole, be screwed with swivel nut, swivel nut outer end is screwed with adjusting screw, in swivel nut, be sliding combined with the front spring seat that is pressed on adjusting screw, the bulb overhead of spool front end has rear spring seat, between front spring seat and rear spring seat, be equipped with big spring, little spring, spool is provided with first step, second step and upper oil duct, lower oil duct matches, the second step rear side of spool has axial aperture.
In described adjusting screw, be screwed with nut.
Described front spring seat, screw plug, swivel nut are set with seal ring outward.
The utility model working principle and working procedure:
The utility model load-sensitive pressure shut-off valve block assembly is installed in BPA series pump, it is by lead to delivery side of pump pressure oil pressure shut-off valve group A mouth and load-sensitive valve group D mouth simultaneously, by A mouth, after the radial and axial aperture a of spool, act on spool right side, spool left side acts on the spring force being produced by big spring and little spring compression, during work, while constantly increasing along with delivery side of pump pressure, the hydraulic coupling of spool right-hand member can increase gradually, at this moment spool can constantly be moved to the left compression big spring and little spring, when pressure does not reach setting pressure, B mouth communicates with C mouth, pump is in large displacement condition, when delivery side of pump pressure is increased to setting pressure, spool is moved to the left B mouth and the disconnection of C mouth at effect lower compression big spring and the little spring of the hydraulic coupling of right-hand member, while A mouth, B mouth, F mouth and E mouth are connected, at this moment delivery side of pump pressure oil acts on the large loculus of flow piston simultaneously, because being greater than small end, the active area of the large end of flow piston make flow piston move and realize pump delivery and be reduced to delivery side of pump flow and only can maintain the state of equilibrium of setting up setting pressure to small end, by D mouth, after the radial and axial aperture b of spool, act on spool right side simultaneously, spool left side acts on the spring force being produced by big spring and little spring compression, also effect has LS feedback pressure simultaneously, and the pressure differential deltap P by delivery side of pump pressure and LS feedback pressure while working produces power and the balance of spring force to the right being produced by big spring and little spring compression left to spool.During work, while constantly increasing along with this pressure differential deltap P, the hydraulic coupling of spool right-hand member can increase gradually, at this moment spool can constantly be moved to the left compression big spring and little spring, when pressure reduction does not reach setting pressure, E mouth communicates with F mouth, pump is in large displacement condition, when delivery side of pump pressure is increased to setting pressure reduction, spool is moved to the left E mouth and the disconnection of F mouth at effect lower compression big spring and the little spring of the hydraulic coupling of right-hand member, while B mouth, C mouth, D mouth and E mouth are connected, at this moment delivery side of pump pressure oil acts on the large loculus of flow piston simultaneously, because being greater than small end, the active area of the large end of flow piston make flow piston move and realize pump delivery and be reduced to delivery side of pump flow and only can maintain and set up the state of equilibrium of setting pressure reduction to small end, this load-sensitive pressure cut off control valve has Power Limitation effect, permanent power and pressure cut off are controlled the maximal input of the pump of limit of functions, load-sensitive control valve need to arbitrfary point work within the scope of this envelope according to load.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is the systematic schematic diagram that the utility model is applied to BPA series pump.
Fig. 3 is pressure cut off controlled variable performance diagram.
Fig. 4 is load-sensitive controlled variable performance diagram.
Embodiment
Referring to Fig. 1, load-sensitive pressure cut off control valve, includes valve body 1, the interior oil duct 2 that laterally has of valve body 1, lower oil duct 3, middle oil duct 4, middle oil duct 4 is respectively by vertical first passage 5, second channel 6 and upper oil duct 2, lower oil duct 3 is connected, middle oil duct 4, first passage 5, second channel 6 outer ends are provided with screw plug 7, upper oil duct 2, in lower oil duct 3, be provided with spool 8, upper oil duct 2, lower oil duct 3 front ends have mounting hole 9, lower mounting hole 10, upper mounting hole 9, in lower mounting hole 10, be screwed with swivel nut 11, swivel nut 11 outer ends are screwed with adjusting screw 12, in swivel nut 11, be sliding combined with the front spring seat 13 that is pressed on adjusting screw 12, the bulb overhead of spool 8 front ends has rear spring seat 14, between front spring seat 13 and rear spring seat 14, is equipped with big spring 15, little spring 16, spool 8 is provided with first step 17, second step 18 and upper oil duct, lower oil duct matches, and the second step rear side of spool has axial aperture 19, in adjusting screw 12, is screwed with nut, front spring seat, screw plug, swivel nut is set with seal ring 20 outward.
In Fig. 2, label is pilot valve assembly 21, servovalve assembly 22, pressure cut off valve assembly 23, load-sensitive valve assembly 24, flow piston 25.
Claims (3)
1. load-sensitive pressure cut off control valve, include valve body, in valve body, laterally have oil duct, lower oil duct, middle oil duct, it is characterized in that, middle oil duct is respectively by vertical first passage, second channel and upper oil duct, lower oil duct is connected, middle oil duct, first passage, second channel outer end is provided with screw plug, upper oil duct, in lower oil duct, be provided with spool, upper oil duct, lower oil duct front end has mounting hole, lower mounting hole, upper mounting hole, in lower mounting hole, be screwed with swivel nut, swivel nut outer end is screwed with adjusting screw, in swivel nut, be sliding combined with the front spring seat that is pressed on adjusting screw, the bulb overhead of spool front end has rear spring seat, between front spring seat and rear spring seat, be equipped with big spring, little spring, spool is provided with first step, second step and upper oil duct, lower oil duct matches, the second step rear side of spool has axial aperture.
2. load-sensitive pressure cut off control valve according to claim 1, is characterized in that, in described adjusting screw, is screwed with nut.
3. load-sensitive pressure cut off control valve according to claim 1, is characterized in that, described front spring seat, screw plug, swivel nut are set with seal ring outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420250492.5U CN203926201U (en) | 2014-05-15 | 2014-05-15 | Load-sensitive pressure cut off control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420250492.5U CN203926201U (en) | 2014-05-15 | 2014-05-15 | Load-sensitive pressure cut off control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203926201U true CN203926201U (en) | 2014-11-05 |
Family
ID=51822019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420250492.5U Expired - Fee Related CN203926201U (en) | 2014-05-15 | 2014-05-15 | Load-sensitive pressure cut off control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203926201U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533774A (en) * | 2014-12-03 | 2015-04-22 | 安徽博一流体传动股份有限公司 | Variable displacement piston pump for loading machine |
| CN104533766A (en) * | 2014-12-03 | 2015-04-22 | 安徽博一流体传动股份有限公司 | Hydraulic plunger pump with various variable control functions |
| CN105114665A (en) * | 2015-08-31 | 2015-12-02 | 苏州萨伯工业设计有限公司 | Flow and pressure control valve |
| CN107664118A (en) * | 2017-11-07 | 2018-02-06 | 安徽博流体传动股份有限公司 | A kind of hydraulic planger pump of a variety of Variable Control functions of band |
| CN110307143A (en) * | 2019-06-21 | 2019-10-08 | 江苏恒立液压科技有限公司 | A kind of variable servo valve, power servo valve and variable pump |
| CN112576566A (en) * | 2020-12-07 | 2021-03-30 | 重庆红江机械有限责任公司 | Displacement feedback proportional flow control valve |
-
2014
- 2014-05-15 CN CN201420250492.5U patent/CN203926201U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533774A (en) * | 2014-12-03 | 2015-04-22 | 安徽博一流体传动股份有限公司 | Variable displacement piston pump for loading machine |
| CN104533766A (en) * | 2014-12-03 | 2015-04-22 | 安徽博一流体传动股份有限公司 | Hydraulic plunger pump with various variable control functions |
| CN105114665A (en) * | 2015-08-31 | 2015-12-02 | 苏州萨伯工业设计有限公司 | Flow and pressure control valve |
| CN107664118A (en) * | 2017-11-07 | 2018-02-06 | 安徽博流体传动股份有限公司 | A kind of hydraulic planger pump of a variety of Variable Control functions of band |
| CN110307143A (en) * | 2019-06-21 | 2019-10-08 | 江苏恒立液压科技有限公司 | A kind of variable servo valve, power servo valve and variable pump |
| CN110307143B (en) * | 2019-06-21 | 2020-09-22 | 江苏恒立液压科技有限公司 | Variable servo valve, power servo valve and variable pump |
| CN112576566A (en) * | 2020-12-07 | 2021-03-30 | 重庆红江机械有限责任公司 | Displacement feedback proportional flow control valve |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 |