CN108278237A - Two-way level 2 buffering valve - Google Patents
Two-way level 2 buffering valve Download PDFInfo
- Publication number
- CN108278237A CN108278237A CN201810074873.5A CN201810074873A CN108278237A CN 108278237 A CN108278237 A CN 108278237A CN 201810074873 A CN201810074873 A CN 201810074873A CN 108278237 A CN108278237 A CN 108278237A
- Authority
- CN
- China
- Prior art keywords
- hydraulic fluid
- fluid port
- circulation passage
- hole
- core assembly
- 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.)
- Pending
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The present invention proposes a kind of two-way level 2 buffering valve, including：Valve body which is provided with hydraulic fluid port A and hydraulic fluid port B；Damper piston is slidably arranged in the top of the valve body inner bore；Screw plug is located at the top of damper piston and is fixedly connected with the valve body, cushion chamber is formed with the damper piston；Adjusting rod is threaded on the screw plug；Core assembly, it is slidably arranged in the valve body, and it is formed with oil back chamber with the valve body and damper piston, the core assembly slides up and down the break-make of controllable hydraulic fluid port A and hydraulic fluid port B along valve body inner bore, the core assembly is equipped with the first circulation passage communicated with cushion chamber, it is additionally provided with connection the first circulation passage and the second circulation passage of hydraulic fluid port A and be connected to the first circulation passage and the third circulation passage of hydraulic fluid port B, be additionally provided on core assembly and be connected to the oil back chamber and the 4th circulation passage of hydraulic fluid port A and be connected to the oil back chamber and the 5th circulation passage of hydraulic fluid port B；First elastic component is located in the oil back chamber；Second elastic component is located in the cushion chamber.The two-way level 2 buffering valve arrangement is simpler, compact, and processing is more convenient, cost is lower.
Description
Technical field
The present invention relates to valve technology fields, and in particular to a kind of two-way level 2 buffering valve, the two-way level 2 buffering valve are main
It applies in minor crane, hydraulic crane, swing mechanism etc..
Background technology
In order to improve the mobility of working efficiency and complete machine in engineering machinery, generally there is swing mechanism.Automobile is risen
Heavy-duty machine, swing mechanism are even more indispensable.And load inertia of the autocrane in revolution is larger, starts, braking is frequent, work
Make inclement condition, thus its hydraulic system requires reliable operation, especially turns round in starting and braking, cannot there is big pressure
Impact.
The prior art generally prevents from overloading by the way that rotary buffering valve is arranged.Current tonnage hydraulic automobile medium and small on the market rises
There are mainly two types of modes for the rotary buffering valve of heavy-duty machine：A kind of to be connected in parallel on rotary motor both ends using Two relief valve, another kind uses
Four check valves and a pilot operated compound relief valve form bridge；It starts, allow closed high-voltage oil liquid by overflowing in braking process
Stream valve overflows, and both direction is all worked.But both the above rotary buffering valve is all made of multiple valve members, body
The more huge and cost of product is higher, unsuitable to be widely used on minor crane.In addition, existing rotary buffering valve is mostly
First-level buffer, general impact force be not big, soft.
Invention content
For some or all of of the above-mentioned technical problem in the presence of the prior art, the present invention proposes a kind of two-way
Level 2 buffering valve, the two-way level 2 buffering valve arrangement is simpler, compact, and processing is more convenient, cost is lower.
In order to realize that the above goal of the invention, the present invention propose a kind of two-way level 2 buffering valve having following structure, wrap
It includes：
Valve body, internal with hole is axially penetrated through, the valve body is equipped with hydraulic fluid port A and hydraulic fluid port B；
Damper piston is slidably arranged in the top of the valve body inner bore, is equipped in the damper piston and axially penetrates through hole；
Screw plug is located at the top of the damper piston and is fixedly connected with the valve body, the screw plug and the buffering
Piston is formed with cushion chamber；
Adjusting rod is threaded on the screw plug；
Core assembly is slidably arranged in the lower part of the valve body inner bore, and is formed with the valve body and damper piston
Oil back chamber, the core assembly top are stretched into the damper piston, and the core assembly slides up and down controllably along valve body inner bore
The break-make of liquefaction mouth A and hydraulic fluid port B, the core assembly are equipped with the first circulation passage communicated with cushion chamber, the spool group
It is additionally provided with connection the first circulation passage and the second circulation passage of hydraulic fluid port A on part and is connected to the of the first circulation passage and hydraulic fluid port B
Three circulation passages are additionally provided with the connection oil back chamber and the 4th circulation passage of hydraulic fluid port A on the core assembly and described in being connected to
5th circulation passage of oil back chamber and hydraulic fluid port B；
First elastic component is located in the oil back chamber, and first elastic component one end is against on the core assembly, separately
One end is against on the damper piston；
Second elastic component is located in the cushion chamber, and one end is against on the core assembly, and the other end is against institute
It states on adjusting rod.
In one embodiment, the core assembly includes poppet valve core, guide rod and connecting seat, the guide rod and institute
It states poppet valve core to be screwed connection, the connecting seat is located at the guide rod top.
In one embodiment, first circulation passage includes being connected to cushion chamber on the connecting seat
First axis hole and the second axial hole being located on the guide rod and third axial hole being connected to first axis hole, it is described
Third axial hole is equipped with damper, and the damper is equipped with damping hole.
In one embodiment, second circulation passage includes being located at the be connected to hydraulic fluid port A on the poppet valve core
Four axial holes and the first speaker hole being connected to the 4th axial hole, first speaker hole are equipped with the first reversed cut-off machine
Structure.
In one embodiment, the third circulation passage includes being located at the be connected to hydraulic fluid port B on the poppet valve core
One radial hole and the second speaker hole being connected to the first radial hole, second speaker hole are equipped with the second reversed cut-off machine
Structure.
In one embodiment, the 4th circulation passage includes being located at the be connected to oil back chamber on the poppet valve core
Five axial holes and the third speaker hole being connected to the 5th axial hole, the third speaker hole reversely end machine equipped with third
Structure.
In one embodiment, the 5th circulation passage includes being located at the be connected to oil back chamber on the poppet valve core
Six axial holes and the 4th speaker hole being connected to the 6th axial hole, the 4th speaker hole are equipped with the 4th reversed cut-off machine
Structure.
In one embodiment, by adjusting the adjustable precompressed being crimped on the core assembly of the adjusting screw rod
Clamp force, to control the first order Opening pressure of core assembly..
In one embodiment, when the pressure of the pressure of hydraulic fluid port A height, hydraulic fluid port B are low, and the oil liquid pressure of hydraulic fluid port A is big
When the active force of the second elastic component, core assembly is open-top, and fluid flows to hydraulic fluid port B by hydraulic fluid port A and opens first class pressure overflow, together
When hydraulic fluid port A fluid through the second circulation passage, the first circulation passage enter cushion chamber and push down on damper piston and compress the first bullet
Property part, the fluid of oil back chamber flows into B mouthfuls through the 5th circulation passage, and the pressure of hydraulic fluid port A increases to two level oil pressure relief.
In one embodiment, when the pressure of the pressure of hydraulic fluid port B height, hydraulic fluid port A are low, and the oil liquid pressure of hydraulic fluid port B is big
When the active force of the second elastic component, core assembly is open-top, and fluid flows to hydraulic fluid port A by hydraulic fluid port B and opens first class pressure overflow, together
When hydraulic fluid port B fluid through third circulation passage, the first circulation passage enter cushion chamber and push down on damper piston and compress the first bullet
Property part, the fluid of oil back chamber flows into A mouthfuls through the 4th circulation passage, and the pressure of hydraulic fluid port B increases to two level oil pressure relief.
Compared with prior art, the advantages of two-way level 2 buffering valve of the invention, is：
It is arranged by the circulation passage on core assembly in the present invention, the higher hydraulic fluid port of pressure in A mouthfuls and B mouthfuls can be selected
It is communicated with cushion chamber, the lower hydraulic fluid port of pressure is selected to be communicated with oil back chamber；Pass through core assembly, damper piston, the first elasticity again
The structure setting and connection relation of part, the second elastic component are realized from hydraulic fluid port A to hydraulic fluid port B and two from hydraulic fluid port B to hydraulic fluid port A
The secondary pressure overload buffer function in direction.Compared with prior art, reduce the arrangement and pipeline that a pile valve body connect band is come
The cumbersome problem of connection, and due to only needing a valve body, more compact structure, while it being greatly reduced cost, and two
Stage pressure buffering effect is softer, and impact is small.
Description of the drawings
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, in figure：
Fig. 1 shows the structural schematic diagram of one of the two-way level 2 buffering valve of present invention embodiment.
In attached drawing, identical component uses identical reference numeral.Attached drawing is not drawn according to actual ratio.
Specific implementation mode
In order to make technical scheme of the present invention and advantage be more clearly understood, below in conjunction with attached drawing to the exemplary of the present invention
Embodiment is described in more detail.Obviously, the described embodiments are merely a part of the embodiments of the present invention, rather than
The exhaustion of all embodiments.And in the absence of conflict, the feature in the embodiment and embodiment in the present invention can be mutual
It is combined.
Inventor is during invention it is noted that generally forming rotary buffering valve by multiple valve members in the prior art to prevent
Overload, leads to that structural volume is more huge and cost is higher, and is mostly buffered with first class pressure overflow, unsuitable to make extensively
With on the swing mechanisms such as minor crane and excavator.
For the above deficiency, the embodiment of the present invention proposes a kind of two-way level 2 buffering valve, is illustrated below.
It as figure 1 shows the one of which embodiment of the two-way level 2 buffering valve of the present invention.In this embodiment, of the invention
Two-way level 2 buffering valve include mainly：Valve body 1, internal with hole is axially penetrated through, valve body 1 is equipped with hydraulic fluid port A and hydraulic fluid port B；
Damper piston 8 is slidably arranged in the top of 1 endoporus of valve body, is equipped in damper piston 8 and axially penetrates through hole；Screw plug 11, is located at
The top of damper piston 8 is simultaneously fixedly connected with valve body 1, and screw plug 11 is formed with cushion chamber 1a with damper piston 8；Adjusting rod 12,
It is threaded on the screw plug 11；Core assembly is slidably arranged in the lower part of 1 endoporus of valve body, and lives with valve body 1 and buffering
Plug 8 is formed with oil back chamber 1b, and the core assembly top is stretched into damper piston 8, and the core assembly is above and below 1 endoporus of valve body
Sliding can control the break-make of hydraulic fluid port A and hydraulic fluid port B, core assembly to be equipped with the first circulation passage communicated with cushion chamber 1a, spool
It is additionally provided with connection the first circulation passage and the second circulation passage of hydraulic fluid port A on component and is connected to the first circulation passage and hydraulic fluid port B
Third circulation passage is additionally provided with connection oil back chamber 1b and the 4th circulation passage of hydraulic fluid port A on core assembly and is connected to oil back chamber 1b
With the 5th circulation passage of hydraulic fluid port B；First elastic component 7 is located in oil back chamber 1b, and 7 one end of the first elastic component is against spool group
On part, the other end is against on damper piston 8；Second elastic component 10, is located in cushion chamber 1a, one end is against core assembly
On, the other end is against 12 on adjusting rod.
In one embodiment, core assembly includes poppet valve core 2, guide rod 3 and connecting seat 9, guide rod 3 and poppet valve core 2
Be screwed connection, and connecting seat 9 is located at 3 top of guide rod.
In one embodiment, the first circulation passage includes the first axle being located on connecting seat 9 being connected to cushion chamber 1a
The second axial hole 31 being located on guide rod 3 and third axial hole 32 being connected to hole 91 and with first axis hole 91, third
Axial hole 32 is equipped with damper 6, and damper 6 is equipped with damping hole 61.
In one embodiment, the second circulation passage includes being located at the 4th axial hole 21 being connected to hydraulic fluid port A on poppet valve core 2
And the first speaker hole 22 being connected to the 4th axial hole 21, the first speaker hole 22 are equipped with the first reversed disabling mechanism 4a.It should
First reversed disabling mechanism 4a is preferably steel ball.
In one embodiment, third circulation passage includes being located at the first radial hole 23 being connected to hydraulic fluid port B on poppet valve core 2
And the second speaker hole 24 being connected to the first radial hole 23, the second speaker hole 24 are equipped with the second reversed disabling mechanism 4a.It should
Second reversed disabling mechanism 4b is preferably steel ball.
In one embodiment, the 4th circulation passage includes being located at the 5th be connected to oil back chamber 1b on poppet valve core 2 axially
Hole 25 and the third speaker hole 26 being connected to the 5th axial hole 25, third speaker hole 26 are equipped with the reversed disabling mechanism of third
5a.The reversed disabling mechanism 5a of the third is preferably steel ball.
In one embodiment, the 5th circulation passage includes being located at the 6th be connected to oil back chamber 1b on poppet valve core 2 axially
Hole 27 and the 4th speaker hole 28 being connected to the 6th axial hole 27, the 4th speaker hole 28 are equipped with the 4th reversed disabling mechanism
5b.4th reversed disabling mechanism 5b is preferably steel ball.
In one embodiment, by adjusting the adjustable pre-pressing force being crimped on core assembly of adjusting screw rod 12, from
And control the first order Opening pressure of core assembly..
In one embodiment, when the pressure of the pressure of hydraulic fluid port A height, hydraulic fluid port B are low, and the oil liquid pressure of hydraulic fluid port A is more than
When the active force of the second elastic component 10, core assembly is open-top, and fluid flows to hydraulic fluid port B by hydraulic fluid port A and opens first class pressure overflow, together
When hydraulic fluid port A fluid enter cushion chamber 1a through the second circulation passage, the first circulation passage and push down on the compression of damper piston 8 first
The fluid of elastic component 7, oil back chamber 1b flows into B mouthfuls through the 5th circulation passage, and the pressure of hydraulic fluid port A is gradually increased to two level overflow pressure
Power.
In one embodiment, when the pressure of the pressure of hydraulic fluid port B height, hydraulic fluid port A are low, and the oil liquid pressure of hydraulic fluid port B is more than
When the active force of the second elastic component 10, core assembly is open-top, and fluid flows to hydraulic fluid port A by hydraulic fluid port B and opens first class pressure overflow, together
When hydraulic fluid port B fluid enter cushion chamber 1a through third circulation passage, the first circulation passage and push down on the compression of damper piston 8 first
The fluid of elastic component 7, oil back chamber 1b flows into A mouthfuls through the 4th circulation passage, and the pressure of hydraulic fluid port B is gradually increased to two level overflow pressure
Power.
In a preferred embodiment, as shown in Figure 1, working principle of the present invention is as follows：
When hydraulic fluid port A is in high pressure, hydraulic fluid port B is in low-pressure state, and the oil liquid pressure of hydraulic fluid port A is more than the second elastic component 10
Active force when, poppet valve core 2 is open-top, and fluid flows to hydraulic fluid port B by hydraulic fluid port A and opens first class pressure overflow；The fluid of hydraulic fluid port A simultaneously
Through 21 open-top first reversed disabling mechanism 4a of the 4th axial hole, by the first speaker hole 22, damping hole 61, third axial hole 32,
Second axial hole 31, first axis hole 91 push down on damper piston 8 into cushion chamber 1a and compress the first elastic component 7, Zhi Daohuan
It rushes piston 8 and the step of valve body 1 offsets, the fluid of oil back chamber 1b pushes the 4th reversed disabling mechanism 5b open through the 6th axial hole 27
Afterwards, B mouthfuls are flowed by the 4th speaker hole 28, the pressure of hydraulic fluid port A is gradually increased to two level oil pressure relief.During this, second is reversed
The disabling mechanism 4b and reversed disabling mechanism 5a of third is in cut-off state under A mouthfuls of pressure effect.
When hydraulic fluid port B is in high pressure, hydraulic fluid port A is in low-pressure state, and the oil liquid pressure of hydraulic fluid port B is more than the second elastic component 10
Active force when, poppet valve core 2 is open-top, and fluid flows to hydraulic fluid port A by hydraulic fluid port B and opens first class pressure overflow；The fluid of hydraulic fluid port B simultaneously
Through 23 open-top second reversed disabling mechanism 4b of the first radial hole, by the second speaker hole 24, damping hole 61, third axial hole 32,
Second axial hole 31, first axis hole 91 push down on damper piston 8 into cushion chamber 1a and compress the first elastic component 7, Zhi Daohuan
It rushes piston 8 and the step of valve body 1 offsets, the fluid of oil back chamber 1b pushes the reversed disabling mechanism 5a of third open through the 5th axial hole 25
Afterwards, A mouthfuls are flowed by third speaker hole 26, the pressure of hydraulic fluid port B is gradually increased to two level oil pressure relief.During this, first is reversed
The reversed disabling mechanism 5b of disabling mechanism 4a and the 4th are in cut-off state under B mouthfuls of pressure effect.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.Therefore, it includes excellent that the following claims are intended to be interpreted as
Select embodiment and fall into having altered and/or changing for the scope of the invention, the change made according to an embodiment of the invention and/
Or modification should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of two-way level 2 buffering valve, which is characterized in that including：
Valve body, internal with hole is axially penetrated through, the valve body is equipped with hydraulic fluid port A and hydraulic fluid port B；
Damper piston is slidably arranged in the top of the valve body inner bore, is equipped in the damper piston and axially penetrates through hole；
Screw plug is located at the top of the damper piston and is fixedly connected with the valve body, the screw plug and the damper piston
It is formed with cushion chamber；
Adjusting rod is threaded on the screw plug；
Core assembly is slidably arranged in the lower part of the valve body inner bore, and is formed with oil return with the valve body and damper piston
Chamber, the core assembly top are stretched into the damper piston, and the core assembly slides up and down controllable liquefaction along valve body inner bore
The break-make of mouthful A and hydraulic fluid port B, the core assembly are equipped with the first circulation passage communicated with cushion chamber, on the core assembly
It is additionally provided with connection the first circulation passage and the second circulation passage of hydraulic fluid port A and is connected to the first circulation passage and the third stream of hydraulic fluid port B
Circulation passage is additionally provided with the connection oil back chamber and the 4th circulation passage of hydraulic fluid port A on the core assembly and is connected to the oil return
5th circulation passage of chamber and hydraulic fluid port B；
First elastic component is located in the oil back chamber, and first elastic component one end is against on the core assembly, the other end
It is against on the damper piston；
Second elastic component is located in the cushion chamber, and one end is against on the core assembly, and the other end is against the tune
On pole.
2. trimmer valve according to claim 1, which is characterized in that the core assembly includes poppet valve core, guide rod and company
Joint chair, the guide rod are screwed with the poppet valve core and connect, and the connecting seat is located at the guide rod top.
3. trimmer valve according to claim 2, which is characterized in that first circulation passage includes being connected to cushion chamber
First axis hole on the connecting seat and second be located on the guide rod being connected to first axis hole are axial
Hole and third axial hole, the third axial hole are equipped with damper, and the damper is equipped with damping hole.
4. trimmer valve according to claim 2, which is characterized in that second circulation passage includes being located at the poppet valve core
The 4th axial hole being connected to hydraulic fluid port A and the first speaker hole being connected to the 4th axial hole are gone up, is set on first speaker hole
There is the first reversed disabling mechanism.
5. trimmer valve according to claim 2, which is characterized in that the third circulation passage includes being located at the poppet valve core
The first radial hole being connected to hydraulic fluid port B and the second speaker hole being connected to the first radial hole are gone up, is set on second speaker hole
There is the second reversed disabling mechanism.
6. trimmer valve according to claim 2, which is characterized in that the 4th circulation passage includes being located at the poppet valve core
The 5th axial hole being connected to oil back chamber and the third speaker hole being connected to the 5th axial hole are gone up, is set on the third speaker hole
There is the reversed disabling mechanism of third.
7. trimmer valve according to claim 2, which is characterized in that the 5th circulation passage includes being located at the poppet valve core
The 6th axial hole being connected to oil back chamber and the 4th speaker hole being connected to the 6th axial hole are gone up, is set on the 4th speaker hole
There is the 4th reversed disabling mechanism.
8. trimmer valve according to claim 1, which is characterized in that by adjusting, the adjusting screw rod is adjustable to be crimped on institute
The pre-pressing force on core assembly is stated, to control the first order Opening pressure of core assembly.
9. trimmer valve according to any one of claim 1 to 8, which is characterized in that when the pressure of hydraulic fluid port A is high, hydraulic fluid port B
When pressure is low, and the oil liquid pressure of hydraulic fluid port A be more than the second elastic component active force when, core assembly is open-top, and fluid is by hydraulic fluid port A
It flows to hydraulic fluid port B and opens first class pressure overflow, while the fluid of hydraulic fluid port A enters buffering through the second circulation passage, the first circulation passage
Chamber pushes down on damper piston and compresses the first elastic component, and the fluid of oil back chamber flows into B mouthfuls through the 5th circulation passage, the pressure of hydraulic fluid port A
Power is gradually increased to two level oil pressure relief.
10. trimmer valve according to any one of claim 1 to 9, which is characterized in that when the pressure of hydraulic fluid port B is high, hydraulic fluid port A
Pressure it is low when, and the oil liquid pressure of hydraulic fluid port B be more than the second elastic component active force when, core assembly is open-top, and fluid is by oil
Mouth B flows to hydraulic fluid port A and opens first class pressure overflow, while the fluid of hydraulic fluid port B is slow through third circulation passage, the entrance of the first circulation passage
It rushes chamber and pushes down on damper piston the first elastic component of compression, the fluid of oil back chamber flows into A mouthfuls through the 4th circulation passage, hydraulic fluid port B's
Pressure is gradually increased to two level oil pressure relief.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810074873.5A CN108278237A (en) | 2018-01-25 | 2018-01-25 | Two-way level 2 buffering valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810074873.5A CN108278237A (en) | 2018-01-25 | 2018-01-25 | Two-way level 2 buffering valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108278237A true CN108278237A (en) | 2018-07-13 |
Family
ID=62805196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810074873.5A Pending CN108278237A (en) | 2018-01-25 | 2018-01-25 | Two-way level 2 buffering valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108278237A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847279A (en) * | 2019-11-28 | 2020-02-28 | 宁波文泽机电技术开发有限公司 | Loader buffer |
| CN111456981A (en) * | 2020-05-22 | 2020-07-28 | 湖南特达液压有限公司 | Built-in bidirectional pressure relief oil cylinder |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1182921B (en) * | 1958-12-02 | 1964-12-03 | Von Roll Ag | Pilot operated safety valve |
| DE3239931A1 (en) * | 1982-10-28 | 1984-05-03 | Mannesmann Rexroth GmbH, 8770 Lohr | Pressure valve, especially a pressure-limiting valve, pressure-reducing valve or the like |
| EP0204666A1 (en) * | 1985-05-31 | 1986-12-10 | EDI SYSTEM Srl | A two-way reversible-flow hydraulic control valve |
| US20030106588A1 (en) * | 2001-12-12 | 2003-06-12 | Sun Hydraulics Corporation | Pilot operated pressure valve |
| DE10310587A1 (en) * | 2003-03-11 | 2004-09-23 | Bosch Rexroth Ag | Pilot actuated pressure relief valve, has pressure governor with a pressure governing piston acted upon towards the opening direction by a rule spring which axially overlaps with the valve spring |
| US20110114203A1 (en) * | 2008-07-08 | 2011-05-19 | Walvoil S.P.A. | Pressure relief valve |
| CN105697832A (en) * | 2016-04-19 | 2016-06-22 | 龙工（上海）精工液压有限公司 | Safety valve with buffer performance |
-
2018
- 2018-01-25 CN CN201810074873.5A patent/CN108278237A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1182921B (en) * | 1958-12-02 | 1964-12-03 | Von Roll Ag | Pilot operated safety valve |
| DE3239931A1 (en) * | 1982-10-28 | 1984-05-03 | Mannesmann Rexroth GmbH, 8770 Lohr | Pressure valve, especially a pressure-limiting valve, pressure-reducing valve or the like |
| EP0204666A1 (en) * | 1985-05-31 | 1986-12-10 | EDI SYSTEM Srl | A two-way reversible-flow hydraulic control valve |
| US20030106588A1 (en) * | 2001-12-12 | 2003-06-12 | Sun Hydraulics Corporation | Pilot operated pressure valve |
| DE10310587A1 (en) * | 2003-03-11 | 2004-09-23 | Bosch Rexroth Ag | Pilot actuated pressure relief valve, has pressure governor with a pressure governing piston acted upon towards the opening direction by a rule spring which axially overlaps with the valve spring |
| US20110114203A1 (en) * | 2008-07-08 | 2011-05-19 | Walvoil S.P.A. | Pressure relief valve |
| CN105697832A (en) * | 2016-04-19 | 2016-06-22 | 龙工（上海）精工液压有限公司 | Safety valve with buffer performance |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847279A (en) * | 2019-11-28 | 2020-02-28 | 宁波文泽机电技术开发有限公司 | Loader buffer |
| CN110847279B (en) * | 2019-11-28 | 2021-12-03 | 王玲芝 | Loader buffer |
| CN111456981A (en) * | 2020-05-22 | 2020-07-28 | 湖南特达液压有限公司 | Built-in bidirectional pressure relief oil cylinder |
| CN111456981B (en) * | 2020-05-22 | 2024-05-17 | 湖南特达液压有限公司 | Built-in bidirectional pressure relief oil cylinder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203856793U (en) | Balance valve and hydraulic cylinder telescoping control loop with same | |
| CN108999836B (en) | Piston rod oil inlet double-acting multistage hydraulic cylinder | |
| CN107939766A (en) | A kind of oil supplementation buffer valve | |
| CN108278237A (en) | Two-way level 2 buffering valve | |
| CN108252975B (en) | Two-way secondary pressure rotary buffering valve | |
| CN201525715U (en) | Crawler crane anti-back-tilting hydraulic system with function of switching high and low voltage | |
| CN108266431A (en) | A kind of secondary pressure bidirectional relief valve | |
| CN108278236A (en) | A kind of bidirectional buffering overflow valve | |
| CN106051186B (en) | Flow type balanced valve with pooling feature | |
| CN207364370U (en) | Flow balance valve | |
| CN106051185A (en) | Balance valve internally provided with buffering valve | |
| CN108278234A (en) | Plug-in rotary buffering valve | |
| CN108252976A (en) | A kind of two-way buffer valve | |
| CN108167253A (en) | Buffer overflow valve | |
| CN108775431A (en) | Balanced valve | |
| CN108533553A (en) | A kind of converging valve and its hydraulic system for realizing double constant displacement pump division flow controls | |
| CN106015673B (en) | A kind of balanced valve with pooling feature | |
| CN108150472B (en) | A kind of buffer overflow valve | |
| CN108150473B (en) | A kind of buffer overflow valve | |
| CN103015473A (en) | Priority control method of excavator and movable arm to rotation and priority valve | |
| CN214578525U (en) | Heavy-load fixed damping force hydraulic bidirectional speed controller | |
| CN108252974B (en) | A kind of compact rotary buffering valve | |
| CN210710470U (en) | Flow control type variable amplitude balance valve | |
| CN208417126U (en) | Clamping cylinder | |
| CN109751440A (en) | Flow balance valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180713 |