CN106402071A - Pressure control device and hydraulic system employing same - Google Patents
Pressure control device and hydraulic system employing same Download PDFInfo
- Publication number
- CN106402071A CN106402071A CN201610840575.3A CN201610840575A CN106402071A CN 106402071 A CN106402071 A CN 106402071A CN 201610840575 A CN201610840575 A CN 201610840575A CN 106402071 A CN106402071 A CN 106402071A
- Authority
- CN
- China
- Prior art keywords
- guide post
- overflow valve
- control device
- pressure control
- plug
- 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
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- 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
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/044—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with more than one spring
-
- 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
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0493—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with a spring other than a helicoidal spring
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a pressure control device and a hydraulic system employing the same in the hydraulic field. The pressure control device comprises an overflow valve, and a plug is arranged at a liquid inlet of the overflow valve. The pressure control device further comprises an elastic compressing device for providing an acting force toward the liquid inlet of the overflow valve for the plug, the plug has a plugging position which is tightly attached to the liquid inlet of the overflow valve under the action of the elastic compressing device, and the plug further has an opening position, wherein the plug overcomes the acting force of the elastic compressing device to act under the action of a hydraulic system pressure, so that the liquid inlet of the overflow valve is opened; the opening pressure of the elastic compressing device is greater than that of the overflow valve. Compared with the prior art, the problem that the overflow valve is likely to be mistakenly opened due to pressure fluctuation of the hydraulic system can be effectively solved, and the stability of the hydraulic system pressure is improved.
Description
Technical field
The present invention relates to one of Hydraulic Field is used for controlling the pressure control device of hydraulic system pressure；The present invention is also
It is related to a kind of hydraulic system using this device.
Background technology
Pressure control device is the vitals of the hydraulic pressure decorum, for the Stress control of hydraulic system design scope
Interior it is ensured that the normal work of hydraulic system；Main two kinds of the pressure control device commonly used at present：
The principle of the 1st, existing frequently-used bowden tubular type pressure control device is that metal tube is subject to compression swelling, touches travel switch contact and breaks
Open or turn on.Due to being limited by processing technique and Bourdon tube material itself, after life-time service, stability is poor, pressure wave
Move than larger；And architectural limitation, ripple lamp tube type pressure control device does not have overflow valve it is impossible to overload to hydraulic system
Protection.
2nd, existing frequently-used plunger type pressure switch is that hydraulic coupling is passed through to compress cylindrical helical spring, drives push rod to touch
Travel switch contact disconnects or turns on；Because the pressure of cylindrical helical spring and decrement are linearly proportional, work as system
Rated pressure set after, because the excess of stroke of travel switch contact is certain, only system pressure decline to a certain extent after,
Push rod could touch the contacting of travel switch, to system ftercompction；The fluctuation range ratio of the operating pressure of pressure switch is larger,
Reduce the stability of system；And due to the structure using inside and outside suit, often occur because of the interference of inside and outside spring
Clamping stagnation, build-up of pressure fluctuates.
Overflow valve is provided with plunger type pressure switch, when system pressure is excessive, the valve port of overflow valve is opened, fluid
Pass sequentially through the inlet of overflow valve, valve port is discharged from overfall, so that system pressure is declined, but in actual use, hydraulic pressure
There is pressure oscillation in system, less pressure oscillation is also easily caused opening by mistake of overflow valve and opens, and is unfavorable for stablizing of hydraulic system.
Content of the invention
It is an object of the invention to provide a kind of pressure control device, in order to solve what existing pressure control device existed
Due to the pressure oscillation of hydraulic system, and it is easily caused the problem that overflow valve is opened by mistake；The present invention also aims to providing one
Plant the hydraulic system using this device.
For achieving the above object, a kind of technical scheme of pressure control device of the present invention is：
Pressure control device, including overflow valve, is provided with plug at the inlet of overflow valve, and described pressure control device also includes using
In the elastic pressuring clamping device of the active force described plug being provided towards overflow valve inlet, described plug has in elastic compression
The closure position fitting tightly with overflow valve inlet in the presence of device, plug also has under hydraulic system pressure effect, blocks up
Head overcomes the active force of elastic pressuring clamping device and action, makes the open position that the inlet of overflow valve is opened；Elastic pressuring clamping device
Opening pressure is more than the Opening pressure of overflow valve itself.
Described overflow valve includes overflow valve body, and on overflow valve body, guiding is equipped with guide post, guide post and overflow valve
It is provided with guide post spring, described plug is arranged at the end of one end of close overflow valve inlet of guide post, leads between valve body
Constitute described elastic pressuring clamping device to bar and guide post spring.
Described pressure control device includes valve body and valve seat, and valve body is assemblied on valve seat, and on valve body, guiding is equipped with plunger,
Described overflow valve is arranged on valve seat, and plunger is provided with gathering sill axially extended along plunger, and in gathering sill, guiding is equipped with and leads
To bar, between one end matched with gathering sill of guide post and guiding groove bottom, it is provided with guide post spring, described plug setting
The other end in guide post；Described elastic pressuring clamping device is arranged at the top of plunger, and elastic pressuring clamping device includes spring strut, spring
Cylinder is arranged above valve body, is provided with push rod in spring strut, and push rod is equipped with push rod spring, and the lower end of push rod is used for connecing with piston
Tactile stress；Guide post is provided with stop section, and gathering sill is provided with the stop section on guide post along guide post axial direction block
The stop part of cooperation.
It is provided with fairlead, spring strut is assemblied on valve body by fairlead, the outer peripheral face of fairlead is provided with above valve body
Annular flange flange, the bottom of spring strut is provided with the installation step installed for the flange on fairlead, and described plunger guide is assemblied in be led
To putting, plunger is provided with sealing ring with the mating surface of fairlead.
Described push rod is inverted T-bar, is provided with steel ball, on the bottom surface of push rod and the top surface of plunger between push rod and plunger
It is respectively equipped with the groove contacting positioning with described steel ball.
Described push rod spring is disk spring.
Described guide post is the reducing bar of two-part, has transition face, described mistake between the big footpath section of guide post and path section
Cross the stop section that face forms guide post, the big footpath section of guide post is assemblied in gathering sill, described stop part is to be arranged at gathering sill
On back-up ring；The bottom of guide post big footpath section end and gathering sill is corresponding to be provided with the installing hole installed for guide post spring, institute
State the end that plug is arranged at the path section of guide post.
In gathering sill, the top of guide post big footpath section is rodless cavity, and in gathering sill, the lower section of guide post big footpath section is to have bar
Chamber, guide post is communicated with passage, and interface channel makes rod chamber connect with rodless cavity.
Described plug includes sealing gasket and plug screw, and described plug screw spinning is in guide post path section end, described sealing gasket dress
It is assigned between plug screw bottom surface and guide post path section end face.
A kind of technical scheme of hydraulic system of the present invention is：
Hydraulic system, including hydraulic pump, hydraulic circuit and pressure control device, pressure control device includes overflow valve, overflow valve
Inlet at be provided with plug, described pressure control device also include for described plug provide towards overflow valve inlet
The elastic pressuring clamping device of active force, described plug is had and is fitted tightly with overflow valve inlet in the presence of elastic pressuring clamping device
Closure position, plug also has under hydraulic system pressure effect, and plug overcomes the active force of elastic pressuring clamping device and action, makes
The open position that the inlet of overflow valve is opened；The Opening pressure of elastic pressuring clamping device is more than the Opening pressure of overflow valve itself.
Described overflow valve includes overflow valve body, and on overflow valve body, guiding is equipped with guide post, guide post and overflow valve
It is provided with guide post spring, described plug is arranged at the end of one end of close overflow valve inlet of guide post, leads between valve body
Constitute described elastic pressuring clamping device to bar and guide post spring.
Described pressure control device includes valve body and valve seat, and valve body is assemblied on valve seat, and on valve body, guiding is equipped with plunger,
Described overflow valve is arranged on valve seat, and plunger is provided with gathering sill axially extended along plunger, and in gathering sill, guiding is equipped with and leads
To bar, between one end matched with gathering sill of guide post and guiding groove bottom, it is provided with guide post spring, described plug setting
The other end in guide post；Described elastic pressuring clamping device is arranged at the top of plunger, and elastic pressuring clamping device includes spring strut, spring
Cylinder is arranged above valve body, is provided with push rod in spring strut, and push rod is equipped with push rod spring, and the lower end of push rod is used for connecing with piston
Tactile stress；Guide post is provided with stop section, and gathering sill is provided with the stop section on guide post along guide post axial direction block
The stop part of cooperation.
It is provided with fairlead, spring strut is assemblied on valve body by fairlead, the outer peripheral face of fairlead is provided with above valve body
Annular flange flange, the bottom of spring strut is provided with the installation step installed for the flange on fairlead, and described plunger guide is assemblied in be led
To putting, plunger is provided with sealing ring with the mating surface of fairlead.
Described push rod is inverted T-bar, is provided with steel ball, on the bottom surface of push rod and the top surface of plunger between push rod and plunger
It is respectively equipped with the groove contacting positioning with described steel ball.
Described push rod spring is disk spring.
Described guide post is the reducing bar of two-part, has transition face, described mistake between the big footpath section of guide post and path section
Cross the stop section that face forms guide post, the big footpath section of guide post is assemblied in gathering sill, described stop part is to be arranged at gathering sill
On back-up ring；The bottom of guide post big footpath section end and gathering sill is corresponding to be provided with the installing hole installed for guide post spring, institute
State the end that plug is arranged at the path section of guide post.
In gathering sill, the top of guide post big footpath section is rodless cavity, and in gathering sill, the lower section of guide post big footpath section is to have bar
Chamber, guide post is communicated with passage, and interface channel makes rod chamber connect with rodless cavity.
Described plug includes sealing gasket and plug screw, and described plug screw spinning is in guide post path section end, described sealing gasket dress
It is assigned between plug screw bottom surface and guide post path section end face.
The invention has the beneficial effects as follows：The present invention arranges plug at the inlet of overflow valve, the opening of elastic pressuring clamping device
Open the Opening pressure that pressure is more than overflow valve itself；During use, when the pressure oscillation of hydraulic system is less, the feed liquor of overflow valve
Mouth is blocked by plug, and overflow valve will not be opened；Only when the pressure oscillation of hydraulic system is larger, plug and overflow valve inlet
Depart from, overflow valve inlet is opened, and overflow valve just can be opened；Compared to prior art, can effectively solve the problem that in hydraulic system ripple
When dynamic less, the problem that overflow valve is opened by mistake, improves the stability of hydraulic system pressure.
Further, it is directed to bar to be arranged in the gathering sill of plunger, guide post arranges interface channel, on guide post,
The pressure balance of lower end, drives guide post to move so that the structure of pressure control device is more simple with the back-up ring on gathering sill
Change, beneficial to production.
Further, push rod spring is set to disk spring, the spiral being used compared to existing pressure switch
The not linear proportionate relationship of spring, the pressure of disk spring and decrement, even if hydraulic system pressure changes less, disk spring
Also can produce larger deflection, and then ensure that plunger has enough strokes to trigger travel switch for controlling hydraulic pump, make
Pressure control device is sensitiveer to the pressure oscillation of hydraulic system reaction.
Brief description
Fig. 1 is the structural representation of the use state of embodiment 1 of pressure control device of the present invention；
In figure：1- travel switch, 2- top cover, 3- push rod, 4- push rod spring, 5- spring strut, 6- steel ball, 7- plunger, 8- guide post
Spring, 9- fairlead, 10- guide post, 11- valve body, 12- back-up ring, 13- sealing gasket, 14- plug screw, 15- overflow valve base, 16- overflows
Stream valve core, 17- back-moving spring, 18- valve seat, 19- inflow entrance, 20- flow export.
Specific embodiment
Below in conjunction with the accompanying drawings embodiments of the present invention are described further.
The embodiment 1 of the pressure control device of the present invention, as shown in figure 1, including valve body 11 and valve seat 18, valve body 11 passes through
Screw is installed on valve seat 18, and valve seat 18 is provided with inflow entrance 19 and flow export 20, is provided with overflow valve base at flow export 20, overflows
On stream valve base, overflow valve is installed, overflow valve includes relief valve spool 16 and back-moving spring 17, relief valve spool 16 and overflow
Inlet on valve base is engaged.
The top of valve body 11 is provided with spring strut 5, and the upper end of spring strut 5 is equipped with top cover 2, is provided with inverted T in spring strut 5
The push rod 3 of type structure, push rod 3 is stacked with push rod spring 4, and push rod spring 4 is video disc spring；Valve body 11 and the company of spring strut 5
The place of connecing is provided with fairlead 9, and on fairlead 9, guiding is equipped with plunger 7, and plunger 7 is provided with sealing with fairlead 9 guiding contact surface
Circle.
Plunger 7 is provided with gathering sill, and on gathering sill, guiding is equipped with guide post 10, and guide post 10 is the change of two-part structure
Footpath bar, has changeover portion between the big footpath section of guide post 10 and path section, and this changeover portion forms the stop section of guide post 10；Guide post
10 big footpath section guiding is assemblied in gathering sill, corresponding between the big footpath section end of guide post 10 and the guiding groove bottom of plunger 7
Be provided with installing hole, installing hole is provided with guide post spring 8；Gathering sill is provided with back-up ring 12, and back-up ring 12 is along gathering sill axial direction side
To the stop section block cooperation with guide post 10；Guide post spring 8 is more than returning spring 17 to excessive to the active force of guide post 10
The active force of stream valve core 16.
In gathering sill, the top of the big footpath section of guide post 10 is rodless cavity, and the lower section of the big footpath section of guide post 10 is no bar
Chamber；Guide post 10 is provided with interface channel, and interface channel is by the spring mounting hole bottom being arranged at guide post 10 being interconnected
The first vertically extending hole and be arranged at extending along guide post 10 radial direction below the stop section of guide post 10
The second hole constitute, interface channel makes rod chamber connect with rodless cavity, makes the pressure of the hydraulic pressure coming from valve body 11 of guide post 10
Power balances each other；The end of the path section of guide post 10 is provided with plug, and plug includes sealing gasket 13 and plug screw 14, plug screw 14 spinning with
The end of the path section of guide post 10, sealing gasket 13 be arranged at the bottom surface of plug screw 14 and the path section of guide post 10 end face it
Between.
Be provided with steel ball 6 between push rod 3 and plunger 7, on the top surface of the bottom surface of push rod 3 and plunger 7 respectively corresponding be provided with
The groove of described steel ball 6 contact positioning；The upper end of push rod 3 is used for the contact portion with travel switch 1, and travel switch 1 is used for controlling
The keying of hydraulic pump processed.
The operation principle of embodiment 1 is as follows：Inflow entrance 19 is connected with hydraulic circuit, generally, when hydraulic system
Pressure is slightly above when setting pressure, and plunger 7 moves, between the displacement of plunger 7 is less than between the stop section of plunger 7 and back-up ring 12
Away from the presence of guide post spring, plug and overflow valve inlet fit tightly, and plug is in closure position, overflow valve inlet
Close, overflow valve does not work, and push rod 3 overcomes the elastic force of push rod spring 4 to move upwards, the contact of travel switch 1 disconnects, hydraulic pressure
Pump quits work.
When the pressure of hydraulic system is excessive, plunger 7 moves, push rod 3 drives the contact of travel switch 1 to disconnect, hydraulic pump
Quit work；Meanwhile, the upper shifting amount of plunger 7 is more than the spacing between the stop section of plunger 7 and back-up ring 12, and plunger 7 passes through back-up ring
12 drive shifting on guide post 10, and plug is in open position, and overflow valve inlet is opened, and overflow valve is opened, the oil in hydraulic system
Liquid is discharged from flow export 20, makes the reduced pressure of hydraulic system.
When the pressure of hydraulic system is less than the setting pressure of system, push rod spring 4 drives push rod 3 and plunger 7 to move down, OK
The closing of contact of Cheng Kaiguan 1, hydraulic pump is started working；Meanwhile, guide post 10 moves down in the presence of guide post spring, plug weight
Newly be returned to closure position, overflow valve inlet close, relief valve spool 16 in the presence of back-moving spring 17 with overflow valve feed liquor
Mouth fits tightly, and overflow valve cuts out, and the pressure of hydraulic system rises.
It is also possible to remove spring strut and plunger in the other embodiment of the embodiment 1 of the hydraulic system of the present invention, pressure
Force control device is overflow valve；Interface channel is not provided with guide post, guide post and plunger are provided separately；Guide post is piston
Bar, guide post guiding is assemblied on valve body, and guide post spring is arranged between guide post and valve body；The unlatching pressure of guide post spring
Power is more than the Opening pressure of overflow valve itself；When hydraulic system is more than the active force of guide post spring to the active force of guide post
When, guide post moves, the plug being arranged at guiding boom end is separated with overflow valve inlet, and plug is in open position, overflow valve
Inlet is opened, and overflow valve is started working；After the reduced pressure of hydraulic system, under guide post is in the presence of guide post spring
Move, plug comes back to closure position, overflow valve inlet is closed；Meanwhile, overflow valve is also switched off in the presence of returning spring.
The specific embodiment of the hydraulic system of the present invention, including hydraulic pump, hydraulic circuit and pressure control device, in this reality
Apply in example in addition to pressure control device, the other parts of hydraulic system or assembly are prior art, and explanation is not repeated；Pressure
The structure of force control device is identical with the structure of any embodiment of the pressure control device of the invention described above, is not repeated
Bright.
Claims (10)
1. pressure control device, including overflow valve it is characterised in that：It is provided with plug, described pressure control at the inlet of overflow valve
Device processed also includes the elastic pressuring clamping device for described plug is provided with the active force towards overflow valve inlet, described plug
There is the closure position fitting tightly with overflow valve inlet in the presence of elastic pressuring clamping device, plug also has in hydraulic system
Under pressure effect, plug overcomes the active force of elastic pressuring clamping device and action, makes the open position that the inlet of overflow valve is opened；Bullet
Property hold down gag Opening pressure be more than overflow valve itself Opening pressure.
2. pressure control device according to claim 1 it is characterised in that：Described overflow valve includes overflow valve body, overflows
On stream valve body, guiding is equipped with guide post, is provided with guide post spring, described plug setting between guide post and overflow valve body
In the end of one end of the close overflow valve inlet of guide post, guide post and guide post spring constitute described elastic compression dress
Put.
3. pressure control device according to claim 1 it is characterised in that：Described pressure control device includes valve body and valve
Seat, valve body is assemblied on valve seat, and on valve body, guiding is equipped with plunger, and described overflow valve is arranged on valve seat, and plunger is provided with edge
The axially extended gathering sill of plunger, in gathering sill, guiding is equipped with guide post, one end matched with gathering sill of guide post with
It is provided with guide post spring, described plug is arranged at the other end of guide post between guiding groove bottom；Described elastic pressuring clamping device sets
It is placed in the top of plunger, elastic pressuring clamping device includes spring strut, spring strut is arranged above valve body, is provided with push rod in spring strut,
Push rod spring is equipped with push rod, the lower end of push rod is used for and piston contact stress；Guide post is provided with stop section, on gathering sill
It is provided with the stop part coordinating with the stop section on guide post along guide post axial direction block.
4. pressure control device according to claim 3 it is characterised in that：It is provided with fairlead, spring strut leads to above valve body
Cross fairlead to be assemblied on valve body, the outer peripheral face of fairlead is provided with annular flange flange, and the bottom of spring strut is provided with fairlead
The installation step installed of flange, described plunger guide is assemblied on fairlead, and the mating surface of plunger and fairlead is provided with close
Seal.
5. the pressure control device according to claim 3 or 4 it is characterised in that：Described push rod is inverted T-bar, pushes away
It is provided with steel ball, the bottom surface of push rod contacts the recessed of positioning with being respectively equipped with the top surface of plunger with described steel ball between bar and plunger
Groove.
6. the pressure control device according to claim 3 or 4 it is characterised in that：Described push rod spring is disk spring.
7. the pressure control device according to claim 3 or 4 it is characterised in that：Described guide post is the reducing of two-part
Bar, has a transition face between the big footpath section of guide post and path section, described transition face forms the stop section of guide post, guide post big
Footpath section is assemblied in gathering sill, and described stop part is the back-up ring being arranged on gathering sill；Guide post big footpath section end and gathering sill
Bottom corresponding be provided with the installing hole installed for guide post spring, described plug is arranged at the end of the path section of guide post.
8. pressure control device according to claim 7 it is characterised in that：In gathering sill, the top of guide post big footpath section is
Rodless cavity, in gathering sill, the lower section of guide post big footpath section is rod chamber, guide post is communicated with passage, interface channel has made bar
Chamber connects with rodless cavity.
9. pressure control device according to claim 7 it is characterised in that：Described plug includes sealing gasket and plug screw, institute
State plug screw spinning in guide post path section end, described sealing gasket is assemblied between plug screw bottom surface and guide post path section end face.
10. hydraulic system, including hydraulic pump, hydraulic circuit and pressure control device, pressure control device includes overflow valve, and it is special
Levy and be：Described pressure control device is the pressure control device described in any one of the claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610840575.3A CN106402071B (en) | 2016-09-22 | 2016-09-22 | Pressure control device and the hydraulic system using the device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610840575.3A CN106402071B (en) | 2016-09-22 | 2016-09-22 | Pressure control device and the hydraulic system using the device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106402071A true CN106402071A (en) | 2017-02-15 |
| CN106402071B CN106402071B (en) | 2018-07-06 |
Family
ID=57998170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610840575.3A Active CN106402071B (en) | 2016-09-22 | 2016-09-22 | Pressure control device and the hydraulic system using the device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106402071B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533725A (en) * | 2009-03-30 | 2009-09-16 | 浙江大学 | Electrohydraulic servo operating mechanism of high-voltage circuit breaker |
| CN201369292Y (en) * | 2009-01-22 | 2009-12-23 | 河南平高电气股份有限公司 | Mechanical oil pressure switch |
| CN203835848U (en) * | 2014-05-21 | 2014-09-17 | 国网四川省电力公司成都市新都供电分公司 | Electric brake closing valve body |
-
2016
- 2016-09-22 CN CN201610840575.3A patent/CN106402071B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201369292Y (en) * | 2009-01-22 | 2009-12-23 | 河南平高电气股份有限公司 | Mechanical oil pressure switch |
| CN101533725A (en) * | 2009-03-30 | 2009-09-16 | 浙江大学 | Electrohydraulic servo operating mechanism of high-voltage circuit breaker |
| CN203835848U (en) * | 2014-05-21 | 2014-09-17 | 国网四川省电力公司成都市新都供电分公司 | Electric brake closing valve body |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106402071B (en) | 2018-07-06 |
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