CN104633233B - A kind of overflow valve using magnetorheological pilot valve - Google Patents
A kind of overflow valve using magnetorheological pilot valve Download PDFInfo
- Publication number
- CN104633233B CN104633233B CN201510071719.9A CN201510071719A CN104633233B CN 104633233 B CN104633233 B CN 104633233B CN 201510071719 A CN201510071719 A CN 201510071719A CN 104633233 B CN104633233 B CN 104633233B
- Authority
- CN
- China
- Prior art keywords
- valve
- magnetorheological
- pilot valve
- overflow
- guide
- Prior art date
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
Abstract
A kind of overflow valve using magnetorheological pilot valve, including overflow valve base, overflow valve upper cover plate, valve core of main valve, overflow valve body, main valve plug spring, magnetorheological pilot valve cone valve, magnetorheological guide's valve cover, magnetorheological pilot valve body, magnetorheological guide's valve piston, magnet coil, check valve sheet, excessively stream plate, pressure spring, pressure regulation block and screw press；The overflow valve upper cover plate, magnetorheological pilot valve front shroud, magnetorheological pilot valve body are installed on overflow valve base；The valve rod of magnetorheological pilot valve cone valve passes through overflow valve upper cover plate, is fit into magnetorheological pilot valve body, and be closely connected with magnetorheological guide's valve piston；The working clearance is formed between magnetorheological guide's valve piston, magnetorheological pilot valve body, magnet coil flows magnetic rheological liquid；Form space between the valve rod of excessively stream plate and magnetorheological pilot valve cone valve, check valve sheet can in the space elastic deformation；Rotation screw press can promote the pressure regulation block of its front end to compress or release pressure spring.
Description
Technical field
The present invention relates to a kind of overflow valve using magnetorheological pilot valve, belong to hydraulic transmission technology field.
Technical background
Overflow valve is wide variety of a kind of pressure-control valve in Hydraulic Power Transmission System, and major function is regulation hydraulic system
Operating pressure, its structure has Direct Action Type and pilot-operated type, and pilot operated compound relief valve is applied to the higher system of circuit pressure.Overflow valve
Opening pressure is the screw rod by rotating pilot valve core rear, adjusts pilot valve initial tension of spring to realize.It is characterized in
It is easy to adjust, flexible, but pressure control range is limited and can not realize automation, the sequencing of pressure real-time monitoring and regulation
And intellectuality.Magnetic rheological liquid is that a kind of viscosity is controllable " intellectual material ", and shearing force, i.e. very little can not be born under normality
Shearing force can just flow it；But when in the magnetic field environment, it can bear certain shear stress, when acting on liquid
When shearing force on body is less than its yield stress, magnetic rheological liquid will not flow, and only produce elastic deformation, only when shearing force is big
Liquid can just flow when yield stress." intelligence " sex expression of magnetic rheological liquid exists, its viscosity and shear yield stress be with
Residing change of magnetic field strength, magnetic field intensity is bigger, and its viscosity and shear yield stress also increase therewith.It is currently based on magnetic current
It is not enough of both the hydraulic valve generally existing of change technology, one is using magnetic rheological liquid as working media, and it is magnetorheological
Liquid is by liquid continuous phase and solid particle dispersions phase composition, and viscosity is big, easily heating, cost is high, so being not suitable for largely being used as
Hydraulicdriven working media；Second, only including at one the working clearance in MR valve, magnetorheological liquid viscosity increases during valve events
Greatly, larger viscous drag can be born when being flowed through in gap so as to adjust pilot valve Opening pressure, but reset when valve is in
During stroke, liquid is still in magnetic field and keeps high viscosity, and this causes return stroke to be also subjected to big viscous drag, can cause
Valve can not reset in time or homing action is delayed substantially, add the response time of hydraulic valve.
The content of the invention
Technical problem underlying to be solved by this invention is to provide the overflow that a kind of application normal hydraulic oil is working media
Valve, it uses magnetic rheological liquid for the working media of pilot valve, by adjust the current strength in magnetorheological guide's valve coil and
The pretightning force of guide's valve spring controls overflow valve opening pressure, realizes regulation and control real time implementation, automation, intelligent and increase pressure
The purpose of adjustable range, while having the characteristics of response action is rapid.
In order to solve above-mentioned technical problem, the invention provides a kind of overflow valve using magnetorheological pilot valve, including
Overflow valve base 1, overflow valve upper cover plate 5, valve core of main valve 2, overflow valve body 3, main valve plug spring 4, magnetorheological pilot valve cone valve
6th, magnetorheological guide's valve cover 7, magnetorheological pilot valve body 14, magnetorheological guide's valve piston 8, magnet coil 9, check valve sheet
10th, excessively stream plate 11, pressure spring 12, pressure regulation block and screw press 13；
The overflow valve upper cover plate 5, magnetorheological pilot valve front shroud 7, magnetorheological pilot valve body 14 are installed on overflow valve
On valve seat 1；The valve rod of magnetorheological pilot valve cone valve 6 passes through overflow valve upper cover plate 5, is fit into magnetorheological pilot valve body 14
It is interior, and be closely connected with magnetorheological guide's valve piston 8；Magnetorheological guide's valve piston 8, magnetorheological pilot valve body 14, electromagnetic wire
The working clearance 15 is formed between circle 9 flows magnetic rheological liquid；Magnetorheological guide's valve piston 8, magnetorheological pilot valve body 14 and electricity
The iron core of magnetic coil 9 is high permeability material；Space, check valve are formed between the valve rod of excessively stream plate 11 and magnetorheological pilot valve cone valve 6
Piece 10 can in the space elastic deformation；Rotation screw press 13 can promote the pressure regulation block of its front end to compress or release pressure regulation
Spring 12.
In a preferred embodiment：Working media in the overflow valve is in normal hydraulic oil, magnetorheological pilot valve
Working media is magnetic flow liquid, and magnetic rheological liquid volume is in 30-150ml.
In a preferred embodiment：The width of the working clearance 15 is 0.3-3mm, and length is 6-60mm.
In a preferred embodiment：Magnetorheological guide's valve piston 8 close to the uniform 3-6 through flow hole 16 in center,
The magnetorheological outer round surface radial distance of guide's valve piston 8 of through flow hole centre distance is more than 5mm.
In a preferred embodiment：At magnetorheological guide's valve piston 8 and the magnetorheological opposite direction of pilot valve cone valve 6
End face installs the check valve sheet 10 and excessively stream plate 11；The check valve sheet 10 is made up of elastomeric material, in excessively stream plate 11 with living
Fill in generation elastic deformation in the space between 8 end faces, closing or unlatching through flow hole 16.
In a preferred embodiment：The magnetorheological side of pilot valve body 14 is installed by the pressure spring 12 and regulation pressure regulation bullet
The briquetting and screw press 13 of the pretightning force of spring 12.
In a preferred embodiment：The overflow valve operating pressure adjustable range is 1-40MPa, and maximum stream flow is 3000L/
min。
Compared to prior art, technical scheme possesses following beneficial effect：
1. pilot operated compound relief valve is combined with magnetorheological pilot valve, MR valve is applied to normal hydraulic oil and be situated between for work
The Hydraulic Power Transmission System of matter, enhances the ability to work of hydraulic system, have also been enlarged the application of MR valve.
2. magnetorheological pilot valve is controlled using current signal, realize the automating of overflow valve operating pressure, it is intelligent and
Real time implementation is controlled；
3. increase through flow hole inside magnetorheological pilot valve so that by the magnetic current for producing magnetic rheology effect when pilot valve is opened
Become the control of liquid viscosity power, and when pilot valve resets, magnetic rheological liquid flows through through flow hole, in magnetic rheology effect influence
Outside area, therefore the mobility of magnetic rheological liquid is not reduced, and homing action response is rapid, sensitive.
4. screw press adjusts control pressure jointly with magnet coil, range of regulation is increased.
Brief description of the drawings
Fig. 1 is preferable to carry out the structural representation of middle overflow valve for the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
With reference to Fig. 1, a kind of overflow valve using magnetorheological pilot valve, the working media in overflow valve is normal hydraulic oil,
Overflow valve operating pressure adjustable range is 1-40MPa, and maximum stream flow is 3000L/min, the working media in magnetorheological pilot valve
For magnetic flow liquid, magnetic rheological liquid volume is in 30-150ml.
A kind of overflow valve using magnetorheological pilot valve includes overflow valve body 1, overflow valve upper cover plate 5, main valve valve
Core 2, main valve plug spring 3, magnetorheological pilot valve cone valve 6, magnetorheological pilot valve front shroud 7, magnetorheological pilot valve body 14, magnetic current
Become guide's valve piston 8, magnet coil 9, pressure spring 12, pressure regulation block and screw press 13.
Overflow valve upper cover plate 5, magnetorheological pilot valve front shroud 7, magnetorheological pilot valve body 14 are installed on overflow valve base 1
On.The valve rod of magnetorheological pilot valve cone valve 6 passes through overflow valve upper cover plate 5, is fit into magnetorheological pilot valve body 14, and with
Magnetorheological guide's valve piston 8 is closely connected.Magnetorheological guide's valve piston 8, magnetorheological pilot valve body 14,9 shapes of magnet coil
Magnetic rheological liquid is flowed into the working clearance 15, the width of the working clearance 15 is 0.3-3mm, and length is 6-60mm.Magnetic current
Become guide's valve piston 8 with the iron core of magnetorheological pilot valve body 14 and magnet coil 9 into high permeability material.
Magnetorheological guide's valve piston 8 is close to the uniform 3-6 through flow hole 16 in center, and the centre distance of through flow hole 16 is magnetorheological
The outer round surface radial distance of guide's valve piston 8 is more than 5mm.Magnetorheological guide's valve piston 8 and the magnetorheological phase negative side of pilot valve cone valve 6
Check valve sheet 10 and excessively stream plate 11 are installed to the end face at place, check valve sheet 10 is made up of elastomeric material, can be in excessively stream plate 11
Elastic deformation, closing or unlatching through flow hole 16 are produced in space between the end face of piston 8.
There are the briquetting and screw rod of pressure spring 12 and the regulation pretightning force of pressure spring 12 in the magnetorheological side of pilot valve body 14
Component 13.Rotation screw press 13 can promote the pressure regulation block of its front end to compress or release pressure spring 12.
During work, hydraulic oil enters overflow valve base 1 by overflow valve oil inlet, and enters overflow valve upper cover via damping hole
The left chamber of magnetorheological pilot valve cone valve 6 in plate 5.When the pressure of hydraulic system is less than the magnetic rheological liquid on the right side of pilot valve cone valve 6
During 12 elastic force sum of shear yield stress and pressure spring, pilot valve cone valve 6 will not be opened.When system hydraulic coupling is more than guide
During the 12 elastic force sum of magnetic rheological liquid shear yield stress and pressure spring on the right side of valve cone valve 6, pilot valve cone valve 6 drives magnetic
Rheology guide valve piston 8 moves right jointly, while magnetic rheological liquid passes through the working clearance from the magnetorheological back cavity of guide's valve piston 8
15 are flowed to ante-chamber, and magnetorheological pilot valve cone valve 6 is opened.Hydraulic oil is from logical after magnetorheological pilot valve cone valve 6 in valve core of main valve 2
Road junction connect fuel tank, now valve core of main valve about 2 two chambers formed pressure differential.When the pressure differential on valve core of main valve 2 can balance master
During the elastic force of valve core spring 4, valve core of main valve 2 is upwardly opened, and overflow valve outlet is opened, and hydraulic oil is flowed into and through out from oil inlet
Hydraulic fluid port flows out.
During magnetorheological 6 opening movement of pilot valve cone valve, the pressure of magnetic rheological liquid is acted on by the hole on excessively stream plate 11
The right flank of check valve sheet 10, makes its elastic deformation and is adjacent to the right side of magnetorheological guide's valve piston, so as to close magnetorheological
Through flow hole 16 on guide's valve piston 8, therefore magnetic rheological liquid can only be flowed by the working clearance 15, and the working clearance 15 is in
In the magnetic line of force coverage that magnet coil 9 is produced, the hydraulic coupling at the only magnetorheological import of pilot valve cone valve 6 can overcome magnetic
Rheology liquid surrender before 12 elastic force of viscous force and pressure spring when, magnetic flow liquid can just flow, the magnetorheological ability of pilot valve cone valve 6
It is enough to open.Current strength in regulating winding, can change the shear yield stress of magnetic flow liquid, i.e., needed for its generation flowing
Power, also just can be with the Opening pressure of regulation relief valve.
Hydraulic system working pressure declines, during less than overflow valve opening pressure, and the power in the magnetorheological left side of guide's valve piston 8 is small
Power in right side, pressure spring 12 pushes away forward magnetorheological guide's valve piston 8, the magnetorheological ante-chamber of guide's valve piston 8 it is magnetorheological
Hydraulic coupling acts on the left surface of check valve sheet 10 by through flow hole 16, and check valve sheet 10 is recovered the shape before elastic deformation, beaten
Open discharge orifice 16.And through flow hole 16 is in larger distance apart from magnet coil 9, influenceed faint by the magnetic line of force, therefore magnetic in through flow hole 16
Rheological fluid viscosity is low readily flowed, therefore can flow to the magnetorheological back cavity of guide's valve piston 8 rapidly, makes magnetorheological guide's valve cone
Valve 6 resets.
The control of the current strength of magnet coil 9 can realize space in real time implementation and intellectuality, but magnetorheological pilot valve
Limited, so the magnet coil number of turn should not be excessive, the current strength that can be loaded is generally in 0-2.5A, produced magnetic flow liquid
Shear stress can be adjusted within this range.In order to increase overflow valve pressure regulation spectrum, at pilot valve rear portion, adjustment has been installed additional
The briquetting and adjusting screw rod 13 of the pretightning force of pressure spring 12, inwardly screw screw rod so that the briquetting compression increase bullet of pressure spring 12
Property power or outwards release screw rod reduce pressure spring 12 elastic force, in conjunction with the control of magnetic rheological liquid viscous drag, so that it may
To realize a wide range of, stepless, continuous overflow valve Stress control.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (6)
1. a kind of overflow valve using magnetorheological pilot valve, including overflow valve base (1), overflow valve upper cover plate (5), valve core of main valve
(2), overflow valve body (3), main valve plug spring (4), magnetorheological pilot valve cone valve (6), magnetorheological guide's valve cover (7), magnetic current
Become pilot valve body (14), magnetorheological guide's valve piston (8), magnet coil (9), check valve sheet (10), excessively stream plate (11), pressure regulation
Spring (12), pressure regulation block and screw press (13)；
It is characterized in that：The overflow valve upper cover plate (5), magnetorheological pilot valve front shroud (7), magnetorheological pilot valve body (14)
It is installed on overflow valve base (1)；The valve rod of magnetorheological pilot valve cone valve (6) passes through overflow valve upper cover plate (5), is fit into magnetic
In rheology pilot valve body (14), and closely it is connected with magnetorheological guide's valve piston (8)；Magnetorheological guide's valve piston (8), magnetic current
Becoming formation working clearance (15) between pilot valve body (14), magnet coil (9) flows magnetic rheological liquid；Magnetorheological pilot valve is lived
The iron core for filling in (8), magnetorheological pilot valve body (14) and magnet coil (9) is high permeability material；Excessively stream plate (11) with it is magnetorheological
Form space between the valve rod of pilot valve cone valve (6), check valve sheet (10) can in the space elastic deformation；Rotate screw press
(13) the pressure regulation block of its front end can be promoted to compress or release pressure spring (12)；
Magnetorheological guide's valve piston (8) is close to the uniform 3-6 through flow hole (16) in center, through flow hole centre distance magnetic current
Become guide's valve piston (8) outer round surface radial distance and be more than 5mm；The working clearance (15) is in what magnet coil (9) was produced
In magnetic line of force coverage, the magnetic line of force that through flow hole (16) is produced by magnet coil (9) is influenceed small；
Hydraulic oil enters overflow valve base (1) by overflow valve oil inlet, and enters magnetic in overflow valve upper cover plate (5) via damping hole
The left chamber of rheology pilot valve cone valve (6)；When the pressure of hydraulic system is less than the magnetic rheological liquid shearing on the right side of pilot valve cone valve (6)
When yield stress and pressure spring (12) elastic force sum, pilot valve cone valve (6) will not be opened；When system hydraulic coupling is more than guide
During magnetic rheological liquid shear yield stress and pressure spring (12) elastic force sum on the right side of valve cone valve (6), pilot valve cone valve (6)
Magnetorheological guide's valve piston (8) is driven to move right jointly, while magnetic rheological liquid is logical from magnetorheological guide's valve piston (8) back cavity
Spend the working clearance (15) is flowed to ante-chamber, and magnetorheological pilot valve cone valve (6) is opened；Valve core of main valve (2) interior hydraulic oil is from magnetorheological
Fuel tank is connected in passway after pilot valve cone valve (6), and now two chambers form pressure differential to valve core of main valve (2) up and down；Work as valve core of main valve
(2) when the pressure differential on can balance the elastic force of main valve plug spring (4), valve core of main valve (2) is upwardly opened, and overflow valve outlet is beaten
Open, hydraulic oil flows into and through oil-out outflow from oil inlet；
During magnetorheological pilot valve cone valve (6) opening movement, the pressure of magnetic rheological liquid is acted on by the hole on excessively stream plate (11)
The right flank of check valve sheet (10), makes its elastic deformation and is adjacent to the right side of magnetorheological guide's valve piston, so as to close magnetic current
The through flow hole (16) become on guide's valve piston (8), therefore magnetic rheological liquid can only be flowed by the working clearance (15), and workplace
Gap (15) is in the magnetic line of force coverage that magnet coil (9) is produced, the liquid at only magnetorheological pilot valve cone valve (6) import
When pressure can overcome viscous force and pressure spring (12) elastic force before magnetic flow liquid surrender, magnetic flow liquid can just flow, magnetic current
Becoming pilot valve cone valve (6) can open；Current strength in regulating winding, it is possible to the Opening pressure of regulation relief valve；
Hydraulic system working pressure declines, and during less than overflow valve opening pressure, the power on the left of magnetorheological guide's valve piston (8) is less than
The power on right side, pressure spring (12) pushes away forward magnetorheological guide's valve piston (8), the magnetic of magnetorheological guide's valve piston (8) ante-chamber
Rheology hydraulic coupling acts on the left surface of check valve sheet (10) by through flow hole (16), and check valve sheet (10) is recovered before elastic deformation
Shape, open through flow hole (16)；And through flow hole (16) is influenceed small by the magnetic line of force, through flow hole (16) interior magnetorheological liquid viscosity is low
It is readily flowed, therefore magnetorheological guide's valve piston (8) back cavity can be flow to rapidly, reset magnetorheological pilot valve cone valve (6).
2. a kind of overflow valve using magnetorheological pilot valve according to claim 1, it is characterised in that：In the overflow valve
Working media be normal hydraulic oil, the working media in magnetorheological pilot valve is magnetic flow liquid, and magnetic rheological liquid volume is in 30-
150ml。
3. a kind of overflow valve using magnetorheological pilot valve according to claim 1, it is characterised in that：The working clearance
(15) width is 0.3-3mm, and length is 6-60mm.
4. a kind of overflow valve using magnetorheological pilot valve according to claim 1, it is characterised in that：The magnetorheological elder generation
Pilot valve piston (8) installs the check valve sheet (10) and excessively stream plate with the end face at magnetorheological pilot valve cone valve (6) opposite direction
(11)；The check valve sheet (10) is made up of elastomeric material, and bullet is produced in the space between excessively stream plate (11) and piston (8) end face
Property deformation, closing or open through flow hole (16).
5. a kind of overflow valve using magnetorheological pilot valve according to claim 1, it is characterised in that：Magnetorheological pilot valve
The pressure spring (12) is installed and the briquetting and screw press (13) of pressure spring (12) pretightning force is adjusted in valve body (14) side.
6. a kind of overflow valve using magnetorheological pilot valve according to claim 1, it is characterised in that：The overflow valve work
Make pressure regulation spectrum for 1-40MPa, maximum stream flow is 3000L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510071719.9A CN104633233B (en) | 2015-02-11 | 2015-02-11 | A kind of overflow valve using magnetorheological pilot valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510071719.9A CN104633233B (en) | 2015-02-11 | 2015-02-11 | A kind of overflow valve using magnetorheological pilot valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104633233A CN104633233A (en) | 2015-05-20 |
| CN104633233B true CN104633233B (en) | 2017-10-20 |
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ID=53212298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510071719.9A Expired - Fee Related CN104633233B (en) | 2015-02-11 | 2015-02-11 | A kind of overflow valve using magnetorheological pilot valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN104633233B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105570521B (en) * | 2016-03-21 | 2018-03-16 | 北京工业大学 | Electromagnetism graphite valve |
| CN106352123A (en) * | 2016-08-11 | 2017-01-25 | 张广 | Pilot-operated relief valve based on magneto-rheological effect |
| CN106168306A (en) * | 2016-08-11 | 2016-11-30 | 张广 | A kind of air relief valve based on magnetic rheology effect |
| CN106224606A (en) * | 2016-08-11 | 2016-12-14 | 张广 | A kind of guide type sequence valve based on magnetic rheology effect |
| CN106369200B (en) * | 2016-11-03 | 2018-07-20 | 华侨大学 | A kind of gas spring overflow valve |
| CN107061416B (en) * | 2017-05-27 | 2018-04-27 | 安徽工程大学 | A kind of Bingham fluid is without spool overflow mechanism and method |
| CN107687526B (en) * | 2017-11-23 | 2018-10-12 | 绍兴市上虞恒峰机械有限公司 | A kind of overflow valve calibrated automatically |
| CN107654437B (en) * | 2017-11-23 | 2018-09-28 | 绍兴市上虞恒峰机械有限公司 | A kind of adjustable overflow valve calibrated automatically |
| CN110953386B (en) * | 2019-12-12 | 2021-04-16 | 山东科技大学 | Novel hydraulic support safety valve and application thereof |
| CN110905576B (en) * | 2019-12-12 | 2020-12-08 | 山东科技大学 | Hydraulic support magneto-rheological pilot operated safety valve based on magnetic control material and application thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19536725C2 (en) * | 1995-10-02 | 1999-05-20 | Mannesmann Rexroth Ag | Pilot operated pressure cut-off valve |
| CN2450424Y (en) * | 2000-11-14 | 2001-09-26 | 湘潭工学院 | Leading overflow valve |
| CN200999897Y (en) * | 2006-12-20 | 2008-01-02 | 上海立新液压有限公司 | Drift diameter over-flow valve |
| CN201531476U (en) * | 2009-10-15 | 2010-07-21 | 昆明理工大学 | Magnetorheological fluid pilot operated type relief valve |
| CN202851494U (en) * | 2012-09-27 | 2013-04-03 | 西南交通大学 | Pilot-operated type overflow valve |
| CN204512602U (en) * | 2015-02-11 | 2015-07-29 | 华侨大学 | Use the relief valve of magnetorheological pilot valve |
-
2015
- 2015-02-11 CN CN201510071719.9A patent/CN104633233B/en not_active Expired - Fee Related
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| CN104633233A (en) | 2015-05-20 |
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Granted publication date: 20171020 Termination date: 20220211 |