CN113719491B - Use stable combination load control valve - Google Patents
Use stable combination load control valve Download PDFInfo
- Publication number
- CN113719491B CN113719491B CN202111029586.0A CN202111029586A CN113719491B CN 113719491 B CN113719491 B CN 113719491B CN 202111029586 A CN202111029586 A CN 202111029586A CN 113719491 B CN113719491 B CN 113719491B
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- China
- Prior art keywords
- valve
- sleeve
- pressure regulating
- spring
- load control
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- 238000007789 sealing Methods 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims description 68
- 238000013016 damping Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 125000003003 spiro group Chemical group 0.000 claims description 3
- 230000033001 locomotion Effects 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
Abstract
The invention discloses a combined load control valve with stable use, which comprises a valve body and a valve core, wherein a control port is arranged on the valve body, a valve sleeve is assembled on the valve body, an oil return port is radially arranged on the valve sleeve, a valve seat capable of axially moving is assembled in the valve sleeve, a reset piece is arranged between the valve seat and the valve sleeve, an oil inlet is axially arranged on the valve seat, the valve core can be axially movably assembled in the valve sleeve, and a conical sealing port matched with the valve core is arranged at the front part of the valve seat; a limiting sleeve is fixed in the valve body, a guide sleeve is arranged between the limiting sleeve and the valve sleeve, a valve sleeve radial hole is formed in the valve sleeve, a guide sleeve radial hole corresponding to the valve sleeve radial hole is formed in the guide sleeve, and a gap is reserved between the rear end face of the valve seat and the front end face of the guide sleeve. The advantages are that: the zero leakage sealing device has reasonable structure, zero leakage sealing and continuously adjustable flow, and can realize stable running of load.
Description
Technical Field
The invention relates to the technical field of control valve manufacturing, in particular to a combined load control valve with stable use.
Background
Hydraulic valves for controlling the state of motion of a load are commonly referred to as load control valves. Common movement states include: ascending, descending, turning and holding at any position. To achieve the function of maintaining any position, the internal leakage of the load control valve itself must be very small, and nominally zero leakage is achieved, so that a cone valve structure is typically used for sealing.
In both the start and stop phases of the load movement, smoothness is required, and the load movement is slowly and smoothly started and stopped and cannot be suddenly impacted. This requires that the load control valve also be smooth during the opening and closing phases, and gradually open and close, i.e. the flow area of the valve port is continuously variable from a minimum near 0 to a maximum, rather than abrupt.
The load control valves in use in the market at present are all cone valve structures, and under most working conditions, the load has vibration and shake, so that the performance of the whole machine is affected. Under some special application working conditions, such as an aerial working platform, the platform is manned and is in an aerial state, so that the movement of the platform must be stable, and certain potential safety hazards exist in vibration and shaking. The sealing structure of the cone valve can realize zero leakage sealing, but once the valve port is opened, the flow area is quite large, and the flow area is only larger along with the movement of the valve core, so that the continuous change of the flow area from 0 to the maximum cannot be realized, and the structure of the cone valve needs to be further improved.
Disclosure of Invention
The invention aims to overcome the defects, and discloses a combined load control valve which has reasonable structure, zero leakage seal, continuous and adjustable flow and can realize stable running of a load.
The technical scheme of the invention is realized as follows:
the combined load control valve comprises a valve body and a valve core, wherein a control port is formed in the valve body, a valve sleeve is assembled on the valve body, an oil return port is radially formed in the valve sleeve, a valve seat capable of axially moving is assembled in the valve sleeve, a reset piece is arranged between the valve seat and the valve sleeve, an oil inlet is axially formed in the valve seat, the valve core can be axially movably assembled in the valve sleeve, and a conical sealing port matched with the valve core is formed in the front part of the valve seat; the valve body in be fixed with the stop collar, the stop collar with be provided with the uide bushing between the valve pocket, the valve pocket on be provided with the radial hole of valve pocket, the uide bushing on be provided with the corresponding uide bushing radial hole of valve pocket, the rear end face of disk seat with leave the clearance between the preceding terminal surface of uide bushing.
The measures for further optimizing the technical scheme are as follows:
as an improvement, the rear end of the valve core is provided with a check ring, a first channel communicated with the oil inlet is arranged in the valve core, the first channel is communicated with a second channel, and the second channel is communicated with a first damping hole arranged on the check ring; the valve core is provided with a first control containing cavity between the valve core and the limiting sleeve, a second control containing cavity is arranged between the valve core and the guide sleeve, a third channel which is communicated with the first control containing cavity and the second control containing cavity is arranged in the valve core, a second damping hole which is communicated with the control port is arranged on the limiting sleeve, and the second control containing cavity is communicated with the second damping hole.
As an improvement, the valve body on be provided with pressure regulating mechanism, pressure regulating mechanism including pressure regulating screw and the spring holder with case looks butt, pressure regulating screw spacing assembly in the valve body, pressure regulating screw on the spiro union have the pressure regulating nut, the pressure regulating nut with be provided with the pressure regulating spring group between the spring holder, the pressure regulating nut can axial displacement but can not rotationally assemble in the valve body.
As an improvement, a steel ball is arranged between the spring seat and the valve core, an assembly cavity matched with the steel ball is arranged on the spring seat, and a conical concave cavity is arranged in the center of the rear end of the valve core.
As an improvement, a limiting cavity is arranged in the valve body, and the pressure regulating screw is assembled in the limiting cavity in a limiting mode.
As an improvement, the pressure regulating screw is provided with a limit clamp spring.
As an improvement, the pressure regulating spring group comprises a first spring and a second spring, and the first spring is sleeved outside the second spring.
As an improvement, the extending end of the pressure regulating screw is provided with a locking nut.
As an improvement, a radial locating pin is arranged between the valve sleeve and the guide sleeve.
As an improvement, the valve body is externally provided with mounting threads.
Compared with the prior art, the invention has the advantages that:
the combined load control valve with stable use is reasonable in structure, realizes continuous change of the overflow area by utilizing axial movement of the valve core and covering or opening the radial hole of the guide sleeve, thereby realizing continuous adjustment of flow, realizing stable running of load and overcoming the inherent impact and vibration of the existing product; the valve seat is provided with a conical sealing port, and the wire sealing is realized by utilizing the matching of the end part of the valve core and the conical sealing port, so that zero leakage in the operation process is ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
fig. 4 is an enlarged view of a portion C in fig. 1.
The names of the reference numerals in the drawings of the present invention are:
the valve body 1, the control port 1a, the mounting screw 11, the valve core 2, the first channel 2a, the second channel 2b, the third channel 2c, the conical concave cavity 2d, the retainer ring 21, the first damping hole 21a, the valve sleeve 3, the oil return port 3a, the valve sleeve radial hole 3b, the valve seat 4, the oil inlet 4a, the gap 4b, the reset piece 41, the conical sealing port 42, the blocking section 43, the limit sleeve 5, the first control containing cavity 5a, the second damping hole 5b, the guide sleeve 6, the second control containing cavity 6a, the guide sleeve radial hole 6b, the pressure regulating screw 71, the limit clamp spring 71a, the spring seat 72, the assembly cavity 72a, the pressure regulating nut 73, the first spring 74a, the second spring 74b, the steel ball 75, the lock nut 76 and the radial positioning pin 8.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1 to 4, a combined load control valve with stable use comprises a valve body 1 and a valve core 2, wherein a control port 1a is arranged on the valve body 1, a valve sleeve 3 is assembled on the valve body 1, an oil return port 3a is radially arranged on the valve sleeve 3, a valve seat 4 capable of axially moving is assembled in the valve sleeve 3, a resetting piece 41 is arranged between the valve seat 4 and the valve sleeve 3, an oil inlet 4a is axially arranged on the valve seat 4, the valve core 2 is assembled in the valve sleeve 3 in an axially movable manner, and a conical sealing port 42 matched with the valve core 2 is arranged at the front part of the valve seat 4; the valve body 1 is internally fixed with a limit sleeve 5, a guide sleeve 6 is arranged between the limit sleeve 5 and the valve sleeve 3, a valve sleeve radial hole 3b is arranged on the valve sleeve 3, a guide sleeve radial hole 6b corresponding to the valve sleeve radial hole 3b is arranged on the guide sleeve 6, and a gap 4b is reserved between the rear end face of the valve seat 4 and the front end face of the guide sleeve 6.
The return member 41 is preferably a spring. The interfaces between the valve inner parts are provided with the necessary sealing structures. In the control valve, the control port 1a side is the front end, and the lock nut 76 side is the rear end.
The rear end of the valve core 2 is provided with a retainer ring 21, a first channel 2a communicated with the oil inlet 4a is arranged in the valve core 2, the first channel 2a is communicated with a second channel 2b, and the second channel 2b is communicated with a first damping hole 21a arranged on the retainer ring 21; a first control containing cavity 5a is arranged between the valve core 2 and the limiting sleeve 5, a second control containing cavity 6a is arranged between the valve core 2 and the guide sleeve 6, a third channel 2c which is communicated with the first control containing cavity 5a and the second control containing cavity 6a is arranged in the valve core 2, a second damping hole 5b which is communicated with the control port 1a is arranged on the limiting sleeve 5, and the second control containing cavity 6a is communicated with the second damping hole 5 b.
The valve body 1 on be provided with pressure regulating mechanism, pressure regulating mechanism include pressure regulating screw 71 and with the spring holder 72 of case 2 looks butt, pressure regulating screw 71 spacing assembly in valve body 1, pressure regulating screw 71 on the spiro union have pressure regulating nut 73, pressure regulating nut 73 with be provided with the pressure regulating spring group between the spring holder 72, pressure regulating nut 73 can axial displacement but can not rotationally assemble in valve body 1.
A steel ball 75 is arranged between the spring seat 72 and the valve core 2, an assembly cavity 72a matched with the steel ball 75 is arranged on the spring seat 72, and a conical concave cavity 2d is arranged in the center of the rear end of the valve core 2.
The valve body 1 is internally provided with a limiting cavity, and the pressure regulating screw 71 is assembled in the limiting cavity in a limiting way.
The pressure regulating screw 71 is provided with a limit clamp spring 71a.
The pressure regulating spring group comprises a first spring 74a and a second spring 74b, wherein the first spring 74a is sleeved outside the second spring 74 b.
In order to achieve a good throttling effect, the displacement of the valve core 2 is relatively long, the design requirement of the pressure regulating spring is relatively high, mainly the length direction is relatively long, the whole length of the control valve is relatively long, and a proper pressure regulating mechanism is required to be designed in order to shorten the whole length as much as possible and facilitate use, installation and processing. The conventional pressure regulating mechanism is characterized in that an adjusting piece (generally an adjusting screw) rotates and simultaneously moves axially, so that the compression or release of a spring is realized, and the length of the adjusting structure is relatively long. According to the pressure regulating structure adopted in the invention, the pressure regulating screw 71 is limited in the limiting cavity of the valve body 1, the pressure regulating screw 71 only rotates and does not axially move, the pressure regulating screw 71 is rotated, the pressure regulating screw 71 is limited and cannot axially move, the pressure regulating nut 73 does not rotate along with the pressure regulating screw 71, the pressure regulating screw 71 rotates to drive the pressure regulating nut 73 to axially move, and the pressure regulating nut 73 compresses the pressure regulating spring set to realize the pressure regulating function. In this embodiment, the outer periphery of the pressure regulating nut 73 has a square structure, four guiding straight grooves are machined in the valve body 1, four corners of the square structure of the pressure regulating nut 73 are assembled in the corresponding guiding straight grooves, and the pressure regulating nut 73 can only axially move in the valve body 1 but cannot rotate due to the limitation of the guiding straight grooves. The limiting clamp spring 71a is arranged, so that the maximum displacement of the pressure regulating nut 73 is limited, the pressure regulating spring can be prevented from being excessively compressed, and the pressure regulating nut 73 can be prevented from falling off from the guide straight groove.
The protruding end of the pressure regulating screw 71 is fitted with a lock nut 76. By means of the cooperation of the locking nut 76 and the end face of the valve body 1, the pressure regulating screw 71 is locked after pressure regulation, and the pressure regulating screw 71 is prevented from rotating after the pressure regulation is completed.
A radial locating pin 8 is arranged between the valve sleeve 3 and the guide sleeve 6.
The valve body 1 is provided with mounting threads 11. The control valve is inserted by using the mounting screw 11, so that the mounting space is small and the integration is convenient.
A section of cylindrical section is arranged outside between the oil inlet 4a and the oil return port 3a, a sealing element is arranged on the cylindrical section, and a section of external thread is arranged on the inner side of the oil return port 3a and is used for being in threaded connection with the mounting hole.
Working principle:
the invention adopts a thread plug-in type tee joint structure, namely, three working ports are arranged, the end face is an oil inlet 4a (namely, a load port), and the side face is an oil return port 3a and a control port 1a; the working principle of the load control valve is as follows: the oil inlet 4a is connected with a load, the oil return port 3a is connected with oil return, and the oil return port 3a also has the function of supplying oil to the load port (the oil inlet 4 a) as an oil inlet, so that a power source is provided for the load, the control port 1a is connected with control pressure, the movement of the valve core 2 is controlled, and the connection of an oil path from the oil inlet 4a to the oil return port 3a is realized.
The valve sleeve 3 is designed with a stepped hole, a valve seat 4, a resetting piece 41 and a guide sleeve 6 are placed, a valve sleeve radial hole 3b is formed in the outer circle of the left part of the valve sleeve 3, a guide sleeve radial hole 6b communicated with the valve sleeve radial hole 3b is formed in the guide sleeve 6, and a valve core 2 is axially arranged in the guide sleeve 6. The right end surface edge of the valve core 2 is matched with a conical sealing port 42 in the valve seat 4 to form conical sealing, and the sealing action diameter is D1. The diameter of the left section of the valve core 2 is D2, the diameter of the middle of the valve core 2 is D3, the diameter D2 and the diameter D3 are in clearance fit with the inner hole step of the limit sleeve 5, and the auxiliary sealing device realizes zero leakage sealing. The outer diameter of the valve seat 4 is D4, and the size relationship of the diameters is: diameter D4 > diameter D3 > diameter D1 > diameter D2.
The valve core 2 is provided with the conical concave cavity 2d, the conical concave cavity 2d is matched with the steel ball 75, centering of the steel ball 75 is guaranteed, and then the steel ball 75 is matched with the assembly cavity 72a on the spring seat 72, so that automatic centering of the spring seat 72 and the valve core 2 is achieved, and the central axes of the spring seat 72 and the valve core 2 are guaranteed to be positioned on the same straight line.
In the initial state of the load control valve, the right end of the middle section of the valve core 2 is pressed at the left end of the guide sleeve 6 under the action of the compression force of the pressure regulating spring, so that the valve core 2 is positioned on the right limit, and the conical sealing port 42 at the left end of the valve seat 4 and the edge of the right end face of the valve core 2 form linear sealing under the action of the resetting piece 41, so that conical sealing is realized, and at the moment, a gap is reserved between the left end face of the valve seat 4 and the right end face of the guide sleeve 6.
When pressure oil enters from the oil inlet 4a, the pressure oil enters into the pressure regulating spring cavity through the first channel 2a and the second channel 2b on the valve core 2 and the first damping hole 21a on the check ring 21, acts on the area of the annular belt between the diameter D1 and the diameter D2, and compared with the compression force of the pressure regulating spring, the pressure regulation of the oil inlet 4a is realized.
When pressure oil enters from the oil return port 3a, the pressure oil enters a gap between the left end face of the valve seat 4 and the right end face of the guide sleeve 6, acts on the area of the annular belt between the diameter D1 and the diameter D4, overcomes the precompression force of the resetting piece 41 to the left, pushes the valve seat 4 to move to the right, opens a passage between the oil return port 3a and the oil inlet 4a, and starts to continuously change from 0 in the opening process.
When pressure oil enters from the control port 1a, the pressure oil enters into the second control containing cavity 6a through the second damping hole 5b on the limit sleeve 5, the pressure is acted on the annular area between the diameter D3 and the diameter D1, the rightward compression force of the pressure regulating spring is overcome, the valve core 2 is pushed to move leftwards, and the conical surface seal formed between the valve core 2 and the valve seat 4 and the covering amount of the guide sleeve radial hole 6b on the guide sleeve 6 are opened; by adjusting the pressure of the control port 1a, the amount of movement of the spool 2 to the left can be adjusted, and the open flow area can be adjusted.
The right end face of the guide sleeve 6 is a limiting position for the left movement of the valve seat 4, the radial holes 6b of the guide sleeve 6 are in one-to-one correspondence with the radial holes 3b of the valve sleeve 3 to form a passage, and when the valve core 2 moves axially, the continuous change of the overflow area is realized by covering or opening the radial holes 6b of the guide sleeve. The valve sleeve 3 and the guide sleeve 6 are limited to rotate relatively through the radial positioning pin 8, so that the smoothness of the corresponding radial hole passage is ensured.
According to the control valve disclosed by the invention, the change gradient of the overflow area can be changed only by changing the diameter or the position of the radial hole 6b of the guide sleeve on the guide sleeve 6, so that different throttling effects are realized, and the actual use working condition can be better matched.
While the preferred embodiments of the present invention have been illustrated, various changes and modifications can be made by one of ordinary skill in the art without departing from the scope of the invention.
Claims (9)
1. The utility model provides a use stable combination load control valve, is including valve body (1) and case (2), valve body (1) on be provided with control port (1 a), characterized by: the valve body (1) is provided with a valve sleeve (3), an oil return port (3 a) is radially formed in the valve sleeve (3), a valve seat (4) capable of axially moving is arranged in the valve sleeve (3), a resetting piece (41) is arranged between the valve seat (4) and the valve sleeve (3), an oil inlet (4 a) is axially formed in the valve seat (4), the valve core (2) can be axially movably assembled in the valve sleeve (3), and a conical sealing port (42) matched with the valve core (2) is formed in the front part of the valve seat (4); a limiting sleeve (5) is fixed in the valve body (1), a guide sleeve (6) is arranged between the limiting sleeve (5) and the valve sleeve (3), a valve sleeve radial hole (3 b) is formed in the valve sleeve (3), a guide sleeve radial hole (6 b) corresponding to the valve sleeve radial hole (3 b) is formed in the guide sleeve (6), and a gap (4 b) is reserved between the rear end face of the valve seat (4) and the front end face of the guide sleeve (6);
the rear end of the valve core (2) is provided with a check ring (21), a first channel (2 a) communicated with the oil inlet (4 a) is arranged in the valve core (2), the first channel (2 a) is communicated with a second channel (2 b), and the second channel (2 b) is communicated with a first damping hole (21 a) arranged on the check ring (21); the valve core (2) with be provided with first control appearance chamber (5 a) between stop collar (5), case (2) with be provided with second control appearance chamber (6 a) between uide bushing (6), case (2) in be provided with the third passageway (2 c) that feeds through first control appearance chamber (5 a) and second control appearance chamber (6 a), stop collar (5) on be provided with control mouthful (1 a) communicating second damping hole (5 b), second control appearance chamber (6 a) with second damping hole (5 b) communicate with each other.
2. A use stable combination load control valve according to claim 1, characterized by: the valve body (1) on be provided with pressure regulating mechanism, pressure regulating mechanism including pressure regulating screw (71) and with spring holder (72) of case (2) looks butt, pressure regulating screw (71) spacing assembly in valve body (1), pressure regulating screw (71) on the spiro union have pressure regulating nut (73), pressure regulating nut (73) with be provided with the pressure regulating spring group between spring holder (72), pressure regulating nut (73) can axial displacement but can not rotationally assemble in valve body (1).
3. A use stable combination load control valve according to claim 2, characterized by: a steel ball (75) is arranged between the spring seat (72) and the valve core (2), an assembly cavity (72 a) matched with the steel ball (75) is formed in the spring seat (72), and a conical concave cavity (2 d) is formed in the center of the rear end of the valve core (2).
4. A use stable combination load control valve according to claim 3, characterized by: the valve body (1) is internally provided with a limiting cavity, and the pressure regulating screw (71) is assembled in the limiting cavity in a limiting way.
5. A use stable combination load control valve according to claim 4, characterized by: and the pressure regulating screw (71) is provided with a limit clamp spring (71 a).
6. A use stable combination load control valve according to claim 5, characterized by: the pressure regulating spring group comprises a first spring (74 a) and a second spring (74 b), and the first spring (74 a) is sleeved outside the second spring (74 b).
7. A use stable combination load control valve according to claim 6, characterized by: the extending end of the pressure regulating screw (71) is provided with a locking nut (76).
8. A use stable combination load control valve according to any one of claims 1 to 7, characterized by: a radial locating pin (8) is arranged between the valve sleeve (3) and the guide sleeve (6).
9. A use stable combination load control valve according to claim 8, characterized by: the valve body (1) is provided with mounting threads (11) outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111029586.0A CN113719491B (en) | 2021-09-03 | 2021-09-03 | Use stable combination load control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111029586.0A CN113719491B (en) | 2021-09-03 | 2021-09-03 | Use stable combination load control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113719491A CN113719491A (en) | 2021-11-30 |
| CN113719491B true CN113719491B (en) | 2023-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111029586.0A Active CN113719491B (en) | 2021-09-03 | 2021-09-03 | Use stable combination load control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113719491B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122882A (en) * | 2011-11-18 | 2013-05-29 | 广西柳工机械股份有限公司 | Adjustable pilot overflow valve |
| CN203257779U (en) * | 2013-05-06 | 2013-10-30 | 北京华德液压工业集团有限责任公司 | Pilot-operated type proportional overflow valve |
| CN206280320U (en) * | 2016-11-24 | 2017-06-27 | 上海立新液压有限公司 | A kind of radiator control valve group |
| CN108869425A (en) * | 2018-07-06 | 2018-11-23 | 佛山信卓派思机械科技有限公司 | A kind of inserted valve for lifting device |
| CN111810688A (en) * | 2020-07-06 | 2020-10-23 | 浙江华益精密机械股份有限公司 | Balance valve |
| CN112253558A (en) * | 2020-10-20 | 2021-01-22 | 浙江大学 | Load control valve integrating large-flow overflow function into main valve core |
| CN213419536U (en) * | 2020-05-21 | 2021-06-11 | 涌镇液压机械（上海）有限公司 | Cartridge valve for high back pressure circuit |
-
2021
- 2021-09-03 CN CN202111029586.0A patent/CN113719491B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122882A (en) * | 2011-11-18 | 2013-05-29 | 广西柳工机械股份有限公司 | Adjustable pilot overflow valve |
| CN203257779U (en) * | 2013-05-06 | 2013-10-30 | 北京华德液压工业集团有限责任公司 | Pilot-operated type proportional overflow valve |
| CN206280320U (en) * | 2016-11-24 | 2017-06-27 | 上海立新液压有限公司 | A kind of radiator control valve group |
| CN108869425A (en) * | 2018-07-06 | 2018-11-23 | 佛山信卓派思机械科技有限公司 | A kind of inserted valve for lifting device |
| CN213419536U (en) * | 2020-05-21 | 2021-06-11 | 涌镇液压机械（上海）有限公司 | Cartridge valve for high back pressure circuit |
| CN111810688A (en) * | 2020-07-06 | 2020-10-23 | 浙江华益精密机械股份有限公司 | Balance valve |
| CN112253558A (en) * | 2020-10-20 | 2021-01-22 | 浙江大学 | Load control valve integrating large-flow overflow function into main valve core |
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| Publication number | Publication date |
|---|---|
| CN113719491A (en) | 2021-11-30 |
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