CN110005653A - Overflow valve for excavator main control valve with filter device - Google Patents
Overflow valve for excavator main control valve with filter device Download PDFInfo
- Publication number
- CN110005653A CN110005653A CN201910232747.2A CN201910232747A CN110005653A CN 110005653 A CN110005653 A CN 110005653A CN 201910232747 A CN201910232747 A CN 201910232747A CN 110005653 A CN110005653 A CN 110005653A
- Authority
- CN
- China
- Prior art keywords
- control valve
- valve seat
- valve
- oil inlet
- hole
- 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- Withdrawn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
- 238000007789 sealing Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 241001484259 Lacuna Species 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 44
- 239000010720 hydraulic oil Substances 0.000 description 8
- 230000003749 cleanliness Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
- B01D35/046—Plug, tap, or cock filters filtering elements mounted in or on a faucet the filtering element being mounted in the faucet plug
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
-
- 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
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- 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
- F16K17/0466—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 special seating surface
-
- 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
- F16K17/06—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 special arrangements for adjusting the opening pressure
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a kind of overflow valve for excavator main control valve with filter device, it is characterized in that, including control valve core, control valve core is set to the front end of valve base cavity, the front end of control valve core and the inner cavity clearance fit of valve seat, the rear end of valve base cavity and the front end for adjusting bolt are cooperatively connected, valve seat it is interior it is intracavitary be equipped with spring base and spring, the rear end of control valve core is withstood by spring base in one end of spring, the other end of spring withstands the front end for adjusting bolt, valve seat is equipped with 4-6 oil inlet inclined hole and 4-6 oil return inner hole, oil inlet inclined hole and oil return inner hole are located at the left and right sides at control valve core and valve seat clearance fit, the head of valve seat is fixed with filter block, strainer is equipped between filter block and the external port of each oil inlet inclined hole, filter block is equipped with aperture, each oil inlet inclined hole is at least connected with an aperture by strainer.Overflow valve of the invention has opening and closing characteristic good, and internal pressure is stablized, and small performance is influenced by outside environmental elements.
Description
Technical field
The present invention relates to a kind of hydraulic control valve more particularly to a kind of main-control valve of excavating machine overflows with filter device
Valve belongs to hydraulic device technical field.
Background technique
Overflow valve for excavator main control valve is mainly used for controlling the maximum working pressure of hydraulic system, protects entire hydraulic pressure system
System safety, reliably.According to client feedback, usually after a period of operation, walking inability occurs for excavator, and on inspection, discovery is overflow
Flow valve insufficient pressure.Find through investigation: excavator working environment is severe and operator does not pay attention to the reasons such as maintenance, usually makes
It is not high at cleanliness of hydraulic oil, therefore overflow valve is caused to be blocked by sundries or burr, can not normally-open, closure, cause hydraulic
System pressure is too low, can not work normally.
Summary of the invention
Asking into the cleanliness of hydraulic oil of valve base cavity how is improved the technical problem to be solved by the present invention is solving
Topic.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is to provide a kind of excavation owner with filter device
Control valve overflow valve, which is characterized in that including control valve core, control valve core is before the front end of valve base cavity, control valve core
End and the inner cavity clearance fit of valve seat, the rear end of valve base cavity and the front end for adjusting bolt are cooperatively connected, and the interior of valve seat intracavitary is set
There are spring base and spring, one end of spring withstands the rear end of control valve core by spring base, and the other end of spring withstands adjusting spiral shell
The front end of bolt, valve seat are equipped with 4-6 oil inlet inclined hole and 4-6 oil return inner hole, and oil inlet inclined hole and oil return inner hole are located at control
The left and right sides at spool processed and valve seat clearance fit, the head of valve seat are fixed with filter block, and filter block is outer with each oil inlet inclined hole
Strainer is equipped between port, filter block is equipped with aperture, and each oil inlet inclined hole is at least connected with an aperture by strainer.
Preferably, the interior intracavitary of valve seat is protruded into the front end of the adjusting bolt, adjusts bolt outer circumference surface and valve seat
Inner wall is cooperatively connected.
Preferably, close equipped with the first O shape between the outer circumference surface of adjusting bolt front end and the inner wall of valve base cavity
Seal.
Preferably, the control valve core and valve seat form linear sealing.
Preferably, the adjusting bolt is fixed on valve seat by locking nut and nut check.
Preferably, oil return inner hole radial equipartition on valve seat；Oil inlet inclined hole is obliquely installed on valve seat, and oil inlet is oblique
The inner port in hole is angle, and the inner port of oil inlet inclined hole is set to around the circular conical surface of control valve core front end；The end of filter block and/or
Radial equipartition has aperture, and the quantity of aperture is no less than the quantity of oil inlet inclined hole.
Preferably, the oil inlet inclined hole and oil return inner hole pass through the retaining ring and third O-ring seals that are stuck on the outside of valve seat
Sealing；The second O-ring seals for sealing it between master control valve body are additionally provided on the outside of valve seat.
Preferably, the structure of the filter screen is beveled structure, and the centre of filter screen is equipped with circular hole；The filtering of filter screen
Precision is 20~25 μm；The material of filter screen is 40Cr；The filter screen of 60 mesh of layer 2-4 or 80 mesh is equipped between valve seat and filter block；
The overall thickness of filter screen is 0.8-1.6mm between valve seat and filter block.
Preferably, the inner cavity of the valve seat is equipped with the different Cylinder inner bore of three rank sizes, adjusts the of bolt and valve seat
One inner hole is closely connected, and the first O-ring seals to seal are equipped in the first inner hole；Spring base, control valve core position
In in the second inner hole, the outside of the second inner hole is equipped with the second O-ring seals；Interporal lacuna is matched in the right end and third of control valve core
It closes, the aperture connecting on third inner hole with the second inner hole is equipped with and the matched chamfering rib of control valve core.
Preferably, the structure of the control valve core is by being successively from left to right: the first cylindrical surface, circular conical surface, the second cylinder
Face and third cylindrical surface；First cylindrical surface and spring base are cooperatively connected；The orifice chamfer rib of the third inner hole of circular conical surface and valve seat
It matches, forms linear sealing；Second cylindrical surface connects circular conical surface and third cylindrical surface, and the diameter dimension on the second cylindrical surface is less than the
The diameter dimension on three cylindrical surfaces；The third inner hole of third cylindrical surface and valve seat is clearance fit.
Structure of relief valve of the invention is compact, good seal performance, there is sealing between oil inlet and oil return opening, valve seat and extraneous
There is sealing.Favorable sealing property, using the linear sealing of the conical surface and valve opening chamfering rib, spool opens performance 98% or more.Together
When due at oil inlet inclined hole be equipped with filter screen, block, block caused by can greatly reducing due to cleanliness of hydraulic oil
The phenomenon that spool, to ensure that the service life of main control valve and the job stability of digging machine.Overflow valve of the invention, which has, to be opened
It is good to close characteristic, internal pressure is stablized, and small performance is influenced by outside environmental elements.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of overflow valve for excavator main control valve with filter device.
Specific embodiment
In order to make the present invention more obvious and understandable, hereby with preferred embodiment, and attached drawing is cooperated to be described in detail below.
Embodiment 1
The present invention is a kind of overflow valve for excavator main control valve with filter device, as shown in Figure 1 comprising control valve core
9, control valve core 9 is set to the front end of 4 inner cavity of valve seat, the front end of control valve core 9 and 4 inner cavity clearance fit of valve seat, and hydraulic oil is from matching
It closes gap and enters 9 front end of control valve core, reach opening controlling valve core 9 after set pressure.Spring base 8 is mounted in control valve core 9
On rear end, and spring force is applied in control valve core 9, and control valve core 9 is closed state under normal condition, with the formation of valve seat 4
Linear sealing.One end of spring 7 withstands the rear end of control valve core 9 by spring base 8, and the other end of spring 7, which is withstood, adjusts bolt 1
Front end, i.e. one end of spring 7 are connected with spring base 8, and the other end, which is connected to, to be adjusted on bolt 1.Spring base 8 and spring 7 are all set to
The interior intracavitary of valve seat 4 is protruded into the inner cavity of valve seat 4, the front end for adjusting bolt 1, the inner wall precision-fit of outer circumference surface and valve seat 4,
It is equipped with the first O-ring seals 5 between the two, prevents external foreign matter and air enters and overflow valve oil leak.Bolt 1 is adjusted to pass through
Locking nut 2 and nut 3 are locked on valve seat 4.6 oil inlet inclined hole P and 6 oil return inner hole T are provided on valve seat 4, into
Oily inclined hole P and oil return inner hole T is located at the left and right sides at control valve core 9 and 4 clearance fit of valve seat, and oil return inner hole T is in valve
Radial equipartition on seat 4, oil inlet inclined hole P are obliquely installed on valve seat 4, and the inner port of oil inlet inclined hole P is angle, oil inlet inclined hole P's
Inner port is set to around the circular conical surface of 9 front end of control valve core.Oil inlet inclined hole P and oil return inner hole T is by being stuck in the gear in the outside of valve seat 4
Circle 10 and third O-ring seals 11 seal.The superolateral external screw thread bottom of valve seat 4 be equipped with the second O-ring seals 6, make its with
It is sealed between master control valve body.The head of valve seat 4 is fixed with filter block 13, between filter block 13 and the external port of each oil inlet inclined hole P
It is equipped with strainer 12, compresses filter screen 12 with filter block 13, strainer 12 is pressed in the external port of oil inlet inclined hole P by filter block 13.It crosses
Strainer 12 is completely disposed at the top of the oil inlet inclined hole P of valve seat 4, and sundries and pollutant is blocked to enter in overflow valve.
60 mesh of layer 2-4 or 80 mesh, material 40Cr are equipped between valve seat 4 and filter block 13, filtering accuracy is 20~25 μm
Filter screen 12, the structure of filter screen 12 is beveled structure, and the overall thickness of all filter screens 12 is 0.8-1.6mm, and centre is equipped with
Circular hole.Filter block 13 is connected through a screw thread with valve seat 4, and the aperture of at least six radial equipartition is distributed on filter block 13；In filter block 13
End, distribution at least six are evenly distributed with aperture.Entered in filter block 13 by these aperture hydraulic oil, into after crossing the filtering of filter screen 12, stream
Enter in overflow valve.Each oil inlet inclined hole P is at least connected with an aperture by strainer 12, and the quantity of aperture is no less than oil inlet inclined hole
The quantity of P.
The Cylinder inner bore that 4 inner cavity of valve seat has three rank sizes different, the first inner hole for adjusting bolt 1 and valve seat 4 are fitted close
Connection, and the first O-ring seals 5 are equipped in the first inner hole, it seals；Spring base 8, control valve core 9 are located at the second inner hole
It is interior, and the outside of the second inner hole is equipped with the second O-ring seals 6；The right end and third inner hole clearance fit of control valve core 9, are stayed
There is the fit clearance of very little, enter convenient for hydraulic oil, opens overflow valve；The aperture connecting on third inner hole with the second inner hole is equipped with
With the matched chamfering rib of control valve core 9.
The structure of control valve core 9 is by being successively from left to right: the first cylindrical surface, circular conical surface, the second cylindrical surface and third cylinder
Face.Wherein the first cylindrical surface and spring base 8 cooperate, and apply spring force and withstand control valve core 9.The third of circular conical surface and valve seat 4
The orifice chamfer rib of inner hole matches, and forms linear sealing.Second cylindrical surface connects circular conical surface and third cylindrical surface, wherein the second circle
Cylinder diameter dimension is minimum, that is to say, that the second cylindrical surface diameter dimension is less than the diameter dimension on third cylindrical surface, convenient for storage
The hydraulic oil entered from oil inlet inclined hole P.The third inner hole of third cylindrical surface and valve seat 4 is clearance fit, is not only play the guiding role,
It so that hydraulic oil is entered 9 right end of control valve core, open overflow valve.
The course of work of the invention is as follows:
Under normal condition, control valve core 9 separates oil inlet inclined hole P and oil return inner hole T under the action of spring 7；Work as oil inlet
When the oil pressure of inclined hole P is more than the set pressure of control valve core 9, control valve core 9 is opened rapidly, makes oil inlet inclined hole P and oil return inner hole T
It connects, the high pressure oil of oil inlet inclined hole P lets out rapidly oil return inner hole T, to play the role of safeguard protection.
Embodiment 2
In the present embodiment, valve seat 4 is equipped with 4 oil inlet inclined hole P and 4 oil return inner hole T.Each oil inlet inclined hole P passes through filter
Aperture on net 12 and a filter block 13 is connected.The filter screen 12 of 4 layer of 60 mesh, filter screen are equipped between valve seat 4 and filter block 13
12 filtering accuracy is 25 μm, and the overall thickness of all filter screens 12 is 1.6mm.
Other are same as Example 1.
Embodiment 3
In the present embodiment, the filter screen 12 of 2 layer of 60 mesh, the filtering essence of filter screen 12 are equipped between valve seat 4 and filter block 13
Degree is 20 μm, and the overall thickness of all filter screens 12 is 0.8mm.
Other are same as Example 1.
Embodiment 4
In the present embodiment, the filter screen 12 of 2 layer of 80 mesh, the filtering essence of filter screen 12 are equipped between valve seat 4 and filter block 13
Degree is 20 μm.
Other are same as Example 1.
Claims (10)
1. a kind of overflow valve for excavator main control valve with filter device, which is characterized in that including control valve core (9), control valve
Core (9) is set to the front end of valve seat (4) inner cavity, the front end of control valve core (9) and the inner cavity clearance fit of valve seat (4), and valve seat (4) is interior
The rear end of chamber and the front end for adjusting bolt (1) are cooperatively connected, and the interior of valve seat (4) intracavitary is equipped with spring base (8) and spring (7), bullet
One end of spring (7) withstands the rear end of control valve core (9) by spring base (8), and the other end of spring (7), which is withstood, adjusts bolt (1)
Front end, valve seat (4) be equipped with 4-6 oil inlet inclined hole (P) and 4-6 oil return inner hole (T), oil inlet inclined hole (P) and oil return inner hole
(T) it is located at the left and right sides at control valve core (9) and valve seat (4) clearance fit, the head of valve seat (4) is fixed with filter block
(13), it being equipped between filter block (13) and the external port of each oil inlet inclined hole (P) strainer (12), filter block (13) is equipped with aperture,
Each oil inlet inclined hole (P) is at least connected with an aperture by strainer (12).
2. a kind of overflow valve for excavator main control valve with filter device as described in claim 1, which is characterized in that described
The interior intracavitary of valve seat (4) is protruded into the front end for adjusting bolt (1), and the inner wall for adjusting bolt (1) outer circumference surface and valve seat (4) cooperates company
It connects.
3. a kind of overflow valve for excavator main control valve with filter device as claimed in claim 1 or 2, which is characterized in that institute
The first O-ring seals (5) are equipped between the outer circumference surface of adjusting bolt (1) front end stated and the inner wall of valve seat (4) inner cavity.
4. a kind of overflow valve for excavator main control valve with filter device as described in claim 1, which is characterized in that described
Control valve core (9) and valve seat (4) form linear sealing.
5. a kind of overflow valve for excavator main control valve with filter device as described in claim 1, which is characterized in that described
Bolt (1) is adjusted to be locked on valve seat (4) by locking nut (2) and nut (3).
6. a kind of overflow valve for excavator main control valve with filter device as described in claim 1, which is characterized in that described
Oil return inner hole (T) radial equipartition on valve seat (4)；Oil inlet inclined hole (P) is obliquely installed on valve seat (4), oil inlet inclined hole (P) it is interior
Port is angle, and the inner port of oil inlet inclined hole (P) is set to around the circular conical surface of control valve core (9) front end；The end of filter block (13)
And/or radial equipartition has aperture, the quantity of aperture is no less than the quantity of oil inlet inclined hole (P).
7. a kind of overflow valve for excavator main control valve with filter device as described in claim 1, which is characterized in that described
Oil inlet inclined hole (P) and oil return inner hole (T) are sealed by the retaining ring (10) and third O-ring seals (11) being stuck on the outside of valve seat (4)；
The second O-ring seals (6) for sealing it between master control valve body are additionally provided on the outside of valve seat (4).
8. a kind of overflow valve for excavator main control valve with filter device as described in claim 1, which is characterized in that described
The structure of filter screen (12) is beveled structure, and the centre of filter screen (12) is equipped with circular hole；The filtering accuracy of filter screen (12) is 20
~25 μm；The material of filter screen (12) is 40Cr；The filtering of 60 mesh of layer 2-4 or 80 mesh is equipped between valve seat (4) and filter block (13)
Net (12)；The overall thickness of filter screen (12) is 0.8-1.6mm between valve seat (4) and filter block (13).
9. a kind of overflow valve for excavator main control valve with filter device as described in claim 1, which is characterized in that described
The inner cavity of valve seat (4) is equipped with the different Cylinder inner bore of three rank sizes, adjusts bolt (1) and the first inner hole of valve seat (4) is closely matched
Connection is closed, is equipped with the first O-ring seals (5) to seal in the first inner hole；Spring base (8), control valve core (9) are located at the
In two inner holes, the outside of the second inner hole is equipped with the second O-ring seals (6)；Interporal lacuna in the right end and third of control valve core (9)
Cooperate, the aperture connecting on third inner hole with the second inner hole is equipped with and the matched chamfering rib of control valve core (9).
10. a kind of overflow valve for excavator main control valve with filter device as claimed in claim 9, which is characterized in that described
Control valve core (9) structure by being successively from left to right: the first cylindrical surface, circular conical surface, the second cylindrical surface and third cylindrical surface；The
One cylindrical surface and spring base (8) are cooperatively connected；Circular conical surface is matched with the orifice chamfer rib of the third inner hole of valve seat (4), is formed
Linear sealing；Second cylindrical surface connects circular conical surface and third cylindrical surface, and the diameter dimension on the second cylindrical surface is less than third cylindrical surface
Diameter dimension；The third inner hole of third cylindrical surface and valve seat (4) is clearance fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910232747.2A CN110005653A (en) | 2019-03-26 | 2019-03-26 | Overflow valve for excavator main control valve with filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910232747.2A CN110005653A (en) | 2019-03-26 | 2019-03-26 | Overflow valve for excavator main control valve with filter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110005653A true CN110005653A (en) | 2019-07-12 |
Family
ID=67168204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910232747.2A Withdrawn CN110005653A (en) | 2019-03-26 | 2019-03-26 | Overflow valve for excavator main control valve with filter device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110005653A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202252194U (en) * | 2011-09-13 | 2012-05-30 | 龙工（上海）桥箱有限公司 | Overflow valve for excavator main control valve |
| CN203374967U (en) * | 2013-07-16 | 2014-01-01 | 宁波海宏液压有限公司 | Remote control overflow valve |
| CN105587701A (en) * | 2015-10-23 | 2016-05-18 | 上海立新液压有限公司 | Load maintaining valve |
| CN207777693U (en) * | 2018-01-16 | 2018-08-28 | 扬州市职业大学 | A kind of check-valves |
| CN208330903U (en) * | 2018-06-22 | 2019-01-04 | 温州美瑞克液压科技有限公司 | A kind of hydraulic lock |
| CN209875597U (en) * | 2019-03-26 | 2019-12-31 | 龙工（上海）精工液压有限公司 | Overflow valve with filter device for excavator main control valve |
-
2019
- 2019-03-26 CN CN201910232747.2A patent/CN110005653A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202252194U (en) * | 2011-09-13 | 2012-05-30 | 龙工（上海）桥箱有限公司 | Overflow valve for excavator main control valve |
| CN203374967U (en) * | 2013-07-16 | 2014-01-01 | 宁波海宏液压有限公司 | Remote control overflow valve |
| CN105587701A (en) * | 2015-10-23 | 2016-05-18 | 上海立新液压有限公司 | Load maintaining valve |
| CN207777693U (en) * | 2018-01-16 | 2018-08-28 | 扬州市职业大学 | A kind of check-valves |
| CN208330903U (en) * | 2018-06-22 | 2019-01-04 | 温州美瑞克液压科技有限公司 | A kind of hydraulic lock |
| CN209875597U (en) * | 2019-03-26 | 2019-12-31 | 龙工（上海）精工液压有限公司 | Overflow valve with filter device for excavator main control valve |
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Application publication date: 20190712 |
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| WW01 | Invention patent application withdrawn after publication |