CN110259752A - Threaded insertion pilot depressurizes second level overflow valve - Google Patents
Threaded insertion pilot depressurizes second level overflow valve Download PDFInfo
- Publication number
- CN110259752A CN110259752A CN201910636036.1A CN201910636036A CN110259752A CN 110259752 A CN110259752 A CN 110259752A CN 201910636036 A CN201910636036 A CN 201910636036A CN 110259752 A CN110259752 A CN 110259752A
- Authority
- CN
- China
- Prior art keywords
- valve
- hydraulic fluid
- fluid port
- guide
- aforementioned
- 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.)
- Withdrawn
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
- F15B13/024—Pressure relief valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
A kind of threaded insertion pilot decompression second level overflow valve, it is characterized by comprising main valve housing, main valve plug, guide's valve seat, sliding spool, pilot valve, pressure regulation valve pocket, piston and connector sleeves, main valve housing is axially hollow and front end forms the first hydraulic fluid port, and side wall is formed with the second hydraulic fluid port；Main valve plug can be movably set in aforementioned main valve housing, for controlling the on-off of aforementioned first hydraulic fluid port and the second hydraulic fluid port；It is set to guide's valve seat forward end seal the rear end of aforementioned main valve plug, and is formed with the first oil pocket between main valve plug；Sliding spool is set to the first oily channel that on aforementioned main valve plug and middle part has the first oil pocket of connection and the first hydraulic fluid port.Degree of regulation of the present invention is high, and tuning linearity is good, and has unidirectional repairing and guide's decompression, realizes that load pressure precisely limits control, it is ensured that the purpose of hydraulic system safe operation.
Description
Technical field
The present invention relates to a kind of overflow valves, belong to hydraulic control valve technical field, are mainly used in movable hydraulic system.
Background technique
Movable hydraulic technology is mainly used in voluntarily mobile in outdoor vehicle, equipment and equipment.Movable hydraulic element is
The important component of movable hydraulic technology, movable hydraulic component structure is light and small, compact, and weight, volume have stringenter limit
System, power density requirements are high, generally use thread cartridge installation form, Various Components are integrated on same valve body；Movable hydraulic
Mechanical load uncertainty is stronger, is mainly reflected in system pressure fluctuation acutely, thus the surge pressure allowable of its element, company
There are notable differences for the requirement of continuous operating pressure, service life and control precision etc. and industrial hydraulic element；Movable hydraulic system
Power often from the removable kinetic energy source such as internal combustion engine, storage battery, therefore extremely emphasize the power between job load and the energy
Match, current precursor overflow valve, is not able to satisfy severe duty requirement in short-term in loading spectrum.
Summary of the invention
It is stable the technical problem to be solved by the present invention is to provide a kind of adjusting pressure for the above-mentioned state of the art
Threaded insertion pilot depressurizes second level overflow valve.
Another technical problem to be solved by this invention is to provide a kind of secondary pressure for the above-mentioned state of the art
The threaded insertion pilot of set-up function depressurizes second level overflow valve.
Another technical problem to be solved by this invention is to provide a kind of unidirectional repairing for the above-mentioned state of the art
Threaded insertion pilot depressurize second level overflow valve.
The technical scheme of the invention to solve the technical problem is: a kind of threaded insertion pilot decompression second level is overflow
Flow valve, it is characterised in that including
Main valve housing, axially hollow and front end form the first hydraulic fluid port, and side wall is formed with the second hydraulic fluid port；
Main valve plug can be movably set in aforementioned main valve housing, for controlling the on-off of aforementioned first hydraulic fluid port and the second hydraulic fluid port；
Guide's valve seat is set to the rear end of aforementioned main valve plug to forward end seal, and is formed with the first oil pocket between main valve plug,
Guide's valve seat laterally offers the guide's hydraulic fluid port communicated with the second hydraulic fluid port；
Sliding spool, on aforementioned main valve plug and middle part has the first oily channel of the first oil pocket of connection and the first hydraulic fluid port；
First spring, both ends offset with main valve plug and guide's valve seat respectively in aforementioned first oil pocket；
Second spring, both ends offset with sliding spool and guide's valve seat respectively in aforementioned first oil pocket；
Pilot valve, on guide's valve seat above-mentioned and front end extend into the first oil pocket, which is detached from guide
In the state of valve seat, guide's hydraulic fluid port above-mentioned is communicated with the first oil pocket；
Pressure regulation valve pocket is set to axially hollow and forward end seal the rear end of aforementioned guide's valve seat；
Piston can axially movably be set in pressure regulation valve pocket above-mentioned and form the second oil between rear end and pressure regulation valve pocket
Chamber；
Connector sleeve, set on aforementioned pressure regulation valve pocket rear end and be axially formed third hydraulic fluid port, form second on the connector sleeve
Oily channel, the second oily channel connection third hydraulic fluid port and the second oil pocket, the connector sleeve front inner wall and piston outer wall sealing cooperate；
Third spring, the trend for forcing piston and pilot valve to be kept away from pressure regulation valve pocket above-mentioned and always；
And
4th spring forces piston to be held away from connector sleeve in the cavity that aforementioned piston and connector sleeve are formed and always
Trend.
Further, the pressure regulation valve pocket outer wall is equipped with the spelling cap for limiting guide's valve seat.
Further, the connector sleeve outer wall is equipped with the stop nut for limiting pressure regulation valve pocket.
The airflow channel communicated with atmosphere, the outer wall port in connector sleeve of the airflow channel are offered on the connector sleeve
Upper cover is equipped with the stop nut, and the cavity of the airflow channel formed in connector sleeve inner wall port and piston and connector sleeve connects
It is logical.The gap that there is open air-flow to pass through between stop nut and connector sleeve outer wall.
Further, the precompression of the 4th spring is greater than the precompression of third spring.
The piston includes roomy end cap portion and positioned at end cap portion front end and long and narrow bar portion, accordingly, described
Pressure regulation valve pocket includes roomy expansion mouth and the elongated portion that is extended forward by expansion mouth, which connect dress with pilot valve
Match, bar portion above-mentioned can be set in elongated portion with moving back and forth, and aforementioned end cap portion is limited in expansion mouth, shape in aforementioned expansion mouth
At second oil pocket.
Compared with the prior art, the advantages of the present invention are as follows: the present invention meets severe duty requirement in short-term, energy in loading spectrum
Source power specification does not need to increase, to improve the economy and practicability of equipment, enhances equipment competitiveness.Overall structure is tight
It gathers, adjusts pressure and stablize, stable state accuracy is high, and excess flow is big, and dynamic response is fast, and overshoot is small, and degree of regulation is high, tuning linearity
It is good, and there is unidirectional repairing and guide's decompression, realize that load pressure precisely limits control, it is ensured that hydraulic system safe operation
Purpose.
Detailed description of the invention
Fig. 1 is example structure schematic diagram.
Fig. 2 is the combined amplifier figure of pressure regulation valve pocket and piston in Fig. 1.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
As shown in Figure 1, the threaded insertion pilot decompression second level overflow valve in the present embodiment includes main valve housing 1, main valve plug
2, guide's valve seat 5, sliding spool 3, the first spring 91, second spring 92, pilot valve 4, pressure regulation valve pocket 7, piston 6, connector sleeve 8,
Third spring 93 and the 4th spring 94.
Main valve housing 1 is axially hollow and front end forms the first hydraulic fluid port 1a, and side wall is formed with the second hydraulic fluid port 1b；Main valve plug 2 can move
It is set in main valve housing 1 dynamicly, for controlling the on-off of the first hydraulic fluid port 1a and the second hydraulic fluid port 1b.
It is set to 5 forward end seal of guide's valve seat the rear end of main valve plug 2, and is formed with the first oil pocket 1e between main valve plug 2,
5 side of guide's valve seat is to offering the guide's hydraulic fluid port 1c communicated with the second hydraulic fluid port 1b；Sliding spool 3 is set on main valve plug 2 and middle part
The first oily channel with connection the first oil pocket 1e and the first hydraulic fluid port 1a.
First spring 91 is set to both ends in the first oil pocket 1e and offsets respectively with main valve plug 2 and guide's valve seat 5；Second spring 92
Both ends offset with sliding spool 3 and guide's valve seat 5 respectively in the first oil pocket 1e.
Pilot valve 4 is set on guide's valve seat 5 and front end extend into the first oil pocket 1e, which is detached from pilot valve
In the state of seat 5, guide's hydraulic fluid port 1c is communicated with the first oil pocket 1e；Pressure regulation valve pocket 7 is axially hollow and forward end seal be set to guide
The rear end of valve seat 5,7 outer wall of pressure regulation valve pocket are equipped with the spelling cap 51 for limiting guide's valve seat 5.
Piston 6 can axially movably be set in pressure regulation valve pocket 7 and form the second oil pocket 1f between rear end and pressure regulation valve pocket 7.
Connector sleeve 8 is set to the rear end of pressure regulation valve pocket 7 and is axially formed third hydraulic fluid port 1d, forms second on the connector sleeve 8
Oily channel 81, the second oily channel 81 are connected to third hydraulic fluid port 1d and the second oil pocket 1f, outside 8 front inner wall of connector sleeve and piston 6
Wall sealing cooperation；8 outer wall of connector sleeve is equipped with the stop nut 71 for limiting pressure regulation valve pocket 7.It is offered on connector sleeve 8 and atmosphere
The airflow channel 82 communicated, the airflow channel 82 are equipped with stop nut 71, the airflow channel in the outer wall port upper cover of connector sleeve 8
82 are connected in 8 inner wall port of connector sleeve with piston 6 with the cavity 1g that connector sleeve 8 is formed.Although stop nut 71 here covers
Port, but do not seal, what cavity 1g was still communicated with atmosphere, it is ensured that air and atmosphere in operational process hollow cavity 1g are protected
Consistent temperature is held, in case interference operation, reduces precision.
The trend that third spring 93 is set in pressure regulation valve pocket 7 and forces always piston 6 and pilot valve 4 to be kept away from, the
Three springs 93 are offseted by gasket 61 with piston 6；4th spring 94 is set in the cavity 1g that piston 6 is formed with connector sleeve 8 and begins
Piston 6 is forced to be held away from the trend of connector sleeve 8 eventually.The precompression of 4th spring 94 is greater than the precompression of third spring 93.
As shown in connection with fig. 2, the piston 6 in the present embodiment includes roomy end cap portion 63 and is located at 63 front end of end cap portion and narrow
Long bar portion 62, accordingly, pressure regulation valve pocket 7 include roomy expansion mouth 73 and the elongated portion 72 extended forward by expansion mouth 73,
The elongated portion 72 is linked and packed with pilot valve 5, and bar portion 62 can be set in elongated portion 72 with moving back and forth, and end cap portion 63 is limited in
In expansion mouth 73, the second oil pocket 1e is formed in expansion mouth 73.
Working principle
1.1 overflow valve principles: main valve plug 2 the first spring 91 and 92 pre-pressing force of second spring and its high pressure make
Press main valve housing 1 with the hydraulic coupling that lower both ends difference in areas generates, the first hydraulic fluid port 1a oil liquid is blocked to flow to the second hydraulic fluid port 1b, maintains the
One hydraulic fluid port 1a pressure, as load increases, the first hydraulic fluid port 1a pressure constantly promoted, when the first hydraulic fluid port 1a boost in pressure is to acting on
Hydraulic coupling caused by the product of pilot valve 4 and 5 sealing area of guide's valve seat, greater than the pre-pressing force of third spring 93, with elder generation
The sum of hydraulic coupling caused by the product of guide valve core 4 and 5 sealing area of guide's valve seat and the second hydraulic fluid port 1b pressure, at this time pilot valve
4 are initially separated with guide's valve seat 5, and as separation distance increases, oil liquid flows to the second hydraulic fluid port 1b of low pressure not from the first oil pocket 1e
Disconnected to increase, the first hydraulic fluid port 1a oil liquid also constantly flows to the first oil pocket 1e, to form barometric gradient since oil liquid flows, the first hydraulic fluid port 1a
Pressure is greater than the first oil pocket 1e pressure, and the first oil pocket 1e chamber pressure is much larger than the second hydraulic fluid port 1b pressure, as barometric gradient increases
Add and act on hydraulic coupling on main valve plug 2 and constantly reduce, so that force direction is on the contrary, overcome the first spring 91 and second spring 92
Pre-pressing force separates primary spools 2 with valve pocket 1, and oil liquid flows directly into the second hydraulic fluid port 1b from the first hydraulic fluid port 1a, and pressure passes through at this time
It crosses dynamic convergence and maintains steady state stability, the valve plays overflow pressure stabilization function in working field.
1.2 guides depressurize principle: the pre-pressing force of third spring is to set wanting for overflow valve the first hydraulic fluid port 1a pressure key
Element, relief valve set pressure are the critically important technical parameters of equipment, directly decision equipment safety, once setting need to be authorized through professional people
Member is adjusted, and since working condition load difference has underloading, normal loading, heavy load demand, thus correspondence at least needs second level
Pressure setting.When third hydraulic fluid port 1d connection fuel tank no pressure acts on control piston 6, the first hydraulic fluid port 1a pressure is by third bullet
The level-one pre-pressing force of spring 93 is set；When third hydraulic fluid port 1d connection pilot control oil, guide's oil pressure is acted on control piston 6
The 4th spring 94 is compressed, pushes control piston 5 until compressing connector sleeve 8, while part release third spring 93, so that third bullet
Spring 93 highly extends, and pre-pressing force reduces, and is secondary prepressing clamp force, corresponds to secondary prepressing clamp force the first hydraulic fluid port 1a overflow pressure at this time
Power reduction meets normal loading operating condition job requirements.When return, the 1d connection fuel tank release of third hydraulic fluid port, the first hydraulic fluid port 1a overflow pressure
Power returns to level-one heavy duty setting.
1.3 unidirectional repairing principles: under the negative load behaviors such as weight decline, the second hydraulic fluid port 1b pressure is greater than first sometimes
Hydraulic fluid port 1a pressure or even the first hydraulic fluid port 1a pressure are lower than 1 atmospheric pressure, form oil liquid and are emptied, cavitation erosion etc. is caused to destroy, in order to anti-
Only this exceedingly odious operating condition generates, and the second hydraulic fluid port 1b has certain return oil pressure, and main valve plug 2 is in the second hydraulic fluid port 1b pressure at this time
Act on the hydraulic coupling that lower both ends difference in areas generates and overcome 92 pre-pressing force of the first spring 91 and second spring, make primary spools 2 with
Valve pocket 1 separates, and oil liquid flows directly into the first hydraulic fluid port 1a from the second hydraulic fluid port 1b, plays the role of repairing.With the first hydraulic fluid port 1a pressure
Go up, main valve plug 2 presses to valve pocket 1 under the first spring 91 and the effect of 92 pre-pressing force of second spring, and valve port is closed.
Third spring 93 is much larger than using 94 precompression of the 4th spring in structure, control piston 5 is pushed by the 4th spring 94
It is adjacent to pressure regulation female connector 7, control piston 5 while third spring 93, realizes level-one set-up function.Guide's control is carried in conjunction with movable hydraulic
Feature processed realizes decompression, and integral layout is novel, and rationally, compact-sized, number of parts is few, multiple functional.Predominantly equip
Power global optimization, improves efficiency, and reduces discharge and provides extremely letter easily implementation.
General repairing overflow valve is formed by check valve and overflow valve parallel combination.The present embodiment is collected two kinds of advantages
At organic whole, using main valve plug 2, the Integrated design of valve pocket 1 and guide's valve seat 5 has been provided simultaneously with overflow valve function and unidirectional
Repairing function reduces number of parts, improves product reliability, and main integrated rear space greatly reduces, using thread cartridge
Form can be easily installed in hydraulic pump outlet, and the import of main control valve easily realizes system overflow and unidirectional repairing, greatly extremely simplely
Widen application.
General main overflow valve is controlled the first oil pocket and is connected with the first hydraulic fluid port using fixed aperture, that is, forms fixed damping, with
The adaptive damping that pilot valve and guide's valve seat openings of sizes are formed, forms Hydraulic bridge, realizes transformation force gradient to control master
Relief function is completed in the unlatching and closure of spool.The design substitutes fixed aperture using sliding valve structure, forms adaptive damping, group
Adaptive damping Hydraulic bridge in pairs obtains fast convergence barometric gradient, and it is fast to reach dynamic response, and control precision is high, steady-state characteristic
Good, barrier load pressure peak value is conducted to engine, improves hydraulic system performance, improves service life of equipment.
Claims (6)
1. a kind of threaded insertion pilot depressurizes second level overflow valve, it is characterised in that including
Main valve housing (1), axially hollow and front end form the first hydraulic fluid port (1a), and side wall is formed with the second hydraulic fluid port (1b)；
Main valve plug (2) can be movably set in aforementioned main valve housing (1), for controlling aforementioned first hydraulic fluid port (1a) and the second hydraulic fluid port
The on-off of (1b)；
Guide's valve seat (5) is set to the rear end of aforementioned main valve plug (2) to forward end seal, and is formed with first between main valve plug (2)
Oil pocket (1e), guide's valve seat (5) laterally offer the guide's hydraulic fluid port (1c) communicated with the second hydraulic fluid port (1b)；
Sliding spool (3), is set on aforementioned main valve plug (2) and middle part has the of connection the first oil pocket (1e) and the first hydraulic fluid port (1a)
One oily channel；
First spring (91) is set to the interior both ends of aforementioned first oil pocket (1e) and offsets respectively with main valve plug (2) and guide's valve seat (5)；
Second spring (92) is set to the interior both ends of aforementioned first oil pocket (1e) and offsets respectively with sliding spool (3) and guide's valve seat (5)；
Pilot valve (4) is set on guide's valve seat (5) above-mentioned and front end extend into the first oil pocket (1e), the pilot valve (4)
It is detached from the state of guide's valve seat (5), guide's hydraulic fluid port (1c) above-mentioned communicates with the first oil pocket (1e)；
Pressure regulation valve pocket (7) is set to axially hollow and forward end seal the rear end of aforementioned guide's valve seat (5)；
Piston (6) can axially movably be set in pressure regulation valve pocket (7) above-mentioned and form the between rear end and pressure regulation valve pocket (7)
Two oil pockets (1f)；
Connector sleeve (8), be set to aforementioned pressure regulation valve pocket (7) rear end and be axially formed third hydraulic fluid port (1d), on the connector sleeve (8) at
Type has the second oily channel (81), which is connected to third hydraulic fluid port (1d) and the second oil pocket (1f), the connector sleeve (8)
Front inner wall and the sealing of piston (6) outer wall cooperate；
Third spring (93) is set in pressure regulation valve pocket (7) above-mentioned and forces always piston (6) and pilot valve (4) to keep remote
From trend；And
4th spring (94) is set in the cavity (1g) that aforementioned piston (6) and connector sleeve (8) are formed and forces piston (6) always
It is held away from the trend of connector sleeve (8).
2. threaded insertion pilot according to claim 1 depressurizes second level overflow valve, it is characterised in that the pressure regulation valve pocket
(7) outer wall is equipped with the spelling cap (51) for limiting guide's valve seat (5).
3. threaded insertion pilot according to claim 1 depressurizes second level overflow valve, it is characterised in that the connector sleeve
(8) outer wall is equipped with the stop nut (71) for limiting pressure regulation valve pocket (7).
4. threaded insertion pilot according to claim 3 depressurizes second level overflow valve, it is characterised in that the connector sleeve (8)
On offer the airflow channel (82) communicated with atmosphere, which is equipped in the outer wall port upper cover of connector sleeve (8)
The stop nut (71), the airflow channel (82) are formed in connector sleeve (8) inner wall port and piston (6) and connector sleeve (8)
Cavity (1g) connection.
5. threaded insertion pilot according to claim 1 depressurizes second level overflow valve, it is characterised in that the 4th spring
(94) precompression is greater than the precompression of third spring (93).
6. threaded insertion pilot according to claim 1 depressurizes second level overflow valve, it is characterised in that the piston (6)
Including roomy end cap portion (63) and it is located at end cap portion (63) front end and long and narrow bar portion (62), accordingly, the pressure regulator valve
Cover the elongated portion (72) that (7) include roomy expansion mouth (73) and extended forward by expansion mouth (73), the elongated portion (72) and elder generation
Guide valve core (5) is linked and packed, and bar portion (62) above-mentioned can be set in elongated portion (72) with moving back and forth, aforementioned end cap portion (63) limit
In expansion mouth (73), second oil pocket (1e) is formed in aforementioned expansion mouth (73).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636036.1A CN110259752A (en) | 2019-07-15 | 2019-07-15 | Threaded insertion pilot depressurizes second level overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636036.1A CN110259752A (en) | 2019-07-15 | 2019-07-15 | Threaded insertion pilot depressurizes second level overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110259752A true CN110259752A (en) | 2019-09-20 |
Family
ID=67926143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910636036.1A Withdrawn CN110259752A (en) | 2019-07-15 | 2019-07-15 | Threaded insertion pilot depressurizes second level overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110259752A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283419A (en) * | 2020-11-27 | 2021-01-29 | 力源液压（苏州）有限公司 | Buffer valve for realizing overflow of two pressure levels |
| CN112923108A (en) * | 2021-03-10 | 2021-06-08 | 力源液压（苏州）有限公司 | Pilot pressurizing two-stage overflow valve |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050081056A (en) * | 2004-02-12 | 2005-08-18 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pilot poppet type relief valve |
| CN1661269A (en) * | 2004-02-25 | 2005-08-31 | 沃尔沃建造设备控股（瑞典）有限公司 | Pilot operated relief valve |
| KR20090091567A (en) * | 2008-02-25 | 2009-08-28 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pressure control valve |
| KR100950571B1 (en) * | 2009-02-27 | 2010-04-01 | (주)동우정공 | Relief valve of heavy equipment |
| CN102859204A (en) * | 2010-05-17 | 2013-01-02 | 沃尔沃建造设备有限公司 | Pressure control valve |
| CN102959298A (en) * | 2010-07-06 | 2013-03-06 | 沃尔沃建造设备有限公司 | Valve for controlling pressure |
| US20150167856A1 (en) * | 2012-01-13 | 2015-06-18 | Kayaba Industry Co., Ltd. | Relief valve |
| CN110259751A (en) * | 2019-07-15 | 2019-09-20 | 宁波克泰液压有限公司 | Threaded insertion pilot is pressurized second level overflow valve |
| CN210461224U (en) * | 2019-07-15 | 2020-05-05 | 宁波克泰液压有限公司 | Thread cartridge type pilot pressure-reducing secondary overflow valve |
-
2019
- 2019-07-15 CN CN201910636036.1A patent/CN110259752A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050081056A (en) * | 2004-02-12 | 2005-08-18 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pilot poppet type relief valve |
| CN1661269A (en) * | 2004-02-25 | 2005-08-31 | 沃尔沃建造设备控股（瑞典）有限公司 | Pilot operated relief valve |
| KR20090091567A (en) * | 2008-02-25 | 2009-08-28 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pressure control valve |
| KR100950571B1 (en) * | 2009-02-27 | 2010-04-01 | (주)동우정공 | Relief valve of heavy equipment |
| CN102859204A (en) * | 2010-05-17 | 2013-01-02 | 沃尔沃建造设备有限公司 | Pressure control valve |
| CN102959298A (en) * | 2010-07-06 | 2013-03-06 | 沃尔沃建造设备有限公司 | Valve for controlling pressure |
| US20150167856A1 (en) * | 2012-01-13 | 2015-06-18 | Kayaba Industry Co., Ltd. | Relief valve |
| CN110259751A (en) * | 2019-07-15 | 2019-09-20 | 宁波克泰液压有限公司 | Threaded insertion pilot is pressurized second level overflow valve |
| CN210461224U (en) * | 2019-07-15 | 2020-05-05 | 宁波克泰液压有限公司 | Thread cartridge type pilot pressure-reducing secondary overflow valve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283419A (en) * | 2020-11-27 | 2021-01-29 | 力源液压（苏州）有限公司 | Buffer valve for realizing overflow of two pressure levels |
| CN112923108A (en) * | 2021-03-10 | 2021-06-08 | 力源液压（苏州）有限公司 | Pilot pressurizing two-stage overflow valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8596993B2 (en) | Dual-pump supply system with bypass-controlled flow regulator | |
| US8256445B2 (en) | Pressurizing and pressure regulating valve and fuel supply system employing the same | |
| US8387665B2 (en) | Combination spring and gas filled accumulator | |
| US4756330A (en) | Flow divider valve | |
| EP2535644B1 (en) | Combustor fuel control systems with flow divider assemblies | |
| US9678515B2 (en) | Lightweight gas pressure regulator | |
| CN110259752A (en) | Threaded insertion pilot depressurizes second level overflow valve | |
| CN203009431U (en) | Cushion valve for excavator motor | |
| CN110259751A (en) | Threaded insertion pilot is pressurized second level overflow valve | |
| CN203570729U (en) | Piloted relief valve | |
| CN210461224U (en) | Thread cartridge type pilot pressure-reducing secondary overflow valve | |
| CN109162975A (en) | A kind of Reversing valve plate with jump position and pressure holding function on agricultural machinery | |
| GB2131520A (en) | Bypass-type differential pressure regulator | |
| CN213982138U (en) | Combination valve suitable for 70MPa operating pressure | |
| CN109477499B (en) | Valve device | |
| CN210240160U (en) | Threaded plug-in type pilot supercharging two-stage overflow valve | |
| GB2066368A (en) | Hydraulic priority circuit for vehicles | |
| WO2022004425A1 (en) | Relief valve | |
| CN214304614U (en) | Pilot-operated proportional pressure reducing valve | |
| CN215334681U (en) | Overflow valve and hydraulic motor with same | |
| CN114593101B (en) | Multi-stage main pressure logic control valve for compensating steady-state hydraulic power | |
| CN215171148U (en) | Overflow valve for hydraulic motor | |
| CN211343541U (en) | Remote pressure control valve and hydraulic system having the same | |
| CN108561357A (en) | A kind of plug-in proportional pressure control valve | |
| CN220434891U (en) | Control valve assembly of boost fuel pump of aeroengine |
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 | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190920 |
|
| WW01 | Invention patent application withdrawn after publication |