CN113719491A - Combined load control valve stable in use - Google Patents
Combined load control valve stable in use Download PDFInfo
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- CN113719491A CN113719491A CN202111029586.0A CN202111029586A CN113719491A CN 113719491 A CN113719491 A CN 113719491A CN 202111029586 A CN202111029586 A CN 202111029586A CN 113719491 A CN113719491 A CN 113719491A
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- valve
- pressure regulating
- sleeve
- spring
- load control
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- 238000007789 sealing Methods 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims description 69
- 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 11
- 230000006872 improvement Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000009434 installation Methods 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
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 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
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a combined load control valve which is stable in use, and the combined load control valve 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 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 is 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; 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 structure is reasonable, the leakage is zero, the flow is continuously adjustable, and the stable operation of the load can be realized.
Description
Technical Field
The invention relates to the technical field of control valve manufacturing, in particular to a combined load control valve which is stable in use.
Background
Hydraulic valves for controlling the state of motion of a load are commonly referred to as load control valves. Common motion states include: ascending, descending, revolving and arbitrary position holding. To achieve any position holding function, the load control valve itself must have very small internal leakage, nominally zero leakage, and therefore is typically sealed with a cone valve structure.
In the starting and stopping phases of the load movement, smoothness is required, and sudden impact cannot be caused when the load movement is started and stopped slowly and stably. This requires that the load control valve must be smooth in the opening and closing phases, and must be gradually opened and closed, that is, the change of the flow area of the valve port can be continuously changed from a minimum value close to 0 to a maximum value, and cannot be sudden change.
Load control valves used in the market at present are all cone valve structures, and under most working conditions, the loads all have vibration and shaking, so that the performance of the whole machine is influenced. Under some special application working conditions, such as an aerial work platform, because the platform is manned and is in an aerial state, the motion 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, along with the movement of the valve core, the flow area is only larger, and the continuous change of the flow area from 0 to the maximum cannot be realized, so the structure of the cone valve needs to be further improved.
Disclosure of Invention
The invention aims to make up for the defects, and discloses a stably-used combined load control valve which is reasonable in structure, zero-leakage sealing, continuously adjustable in flow and capable of realizing stable operation of a load to the society.
The technical scheme of the invention is realized as follows:
a stably used 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 moving axially 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 is axially movably assembled in the valve sleeve, and a conical sealing port matched with the valve core is formed in the front 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 barrel, the valve barrel on be provided with the radial hole of valve barrel, the uide bushing on be provided with the radial hole of valve barrel corresponds to the radial hole of valve barrel, 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, a check ring is arranged at the rear end of the valve core, 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 cavity between the valve core and the limiting sleeve, a second control cavity between the valve core and the guide sleeve, a third channel communicated with the first control cavity and the second control cavity is arranged in the valve core, a second damping hole communicated with the control port is arranged on the limiting sleeve, and the second control 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 with case looks butt's spring holder, the spacing assembly of pressure regulating screw in the valve body, pressure regulating screw on the spiro union have pressure regulating nut, pressure regulating nut with be provided with pressure regulating spring group between the spring holder, pressure regulating nut can axial displacement but assemble in the valve body unrotatably.
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 limiting 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 positioning pin is arranged between the valve sleeve and the guide sleeve.
As the improvement, the valve body is externally provided with mounting threads.
Compared with the prior art, the invention has the advantages that:
the stably-used combined load control valve is reasonable in structure, the valve core moves axially, and the continuous change of the flow area is realized by covering or opening the radial hole of the guide sleeve, so that the continuous adjustment of the flow is realized, the stable operation of the load is realized, and the inherent impact and vibration of the existing product are overcome; the valve seat is provided with a conical sealing opening, and line sealing is realized by matching the end part of the valve core with the conical sealing opening, so that zero leakage in the operation process is ensured.
Drawings
FIG. 1 is a schematic structural view 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 the portion C in fig. 1.
The names of the reference numbers in the drawings of the invention are as follows:
the valve comprises a valve body 1, a control port 1a, an installation thread 11, a valve core 2, a first channel 2a, a second channel 2b, a third channel 2c, a conical cavity 2d, a retainer ring 21, a first damping hole 21a, a valve sleeve 3, an oil return port 3a, a valve sleeve radial hole 3b, a valve seat 4, an oil inlet 4a, a gap 4b, a reset piece 41, a conical sealing port 42, a plugging section 43, a limiting sleeve 5, a first control accommodating cavity 5a, a second damping hole 5b, a guide sleeve 6, a second control accommodating cavity 6a, a guide sleeve radial hole 6b, a pressure regulating screw 71, a limiting snap spring 71a, a spring seat 72, an assembly cavity 72a, a pressure regulating nut 73, a first spring 74a, a second spring 74b, a steel ball 75, a locking nut 76 and a 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 the valve body 1 is provided with a control port 1a, the valve body 1 is provided with a valve sleeve 3, the valve sleeve 3 is radially provided with an oil return port 3a, the valve sleeve 3 is internally provided with a valve seat 4 capable of moving axially, a reset member 41 is arranged between the valve seat 4 and the valve sleeve 3, the valve seat 4 is axially provided with an oil inlet 4a, the valve core 2 is axially movably arranged in the valve sleeve 3, and the front part of the valve seat 4 is provided with a tapered sealing port 42 matched with the valve core 2; the valve comprises a valve body 1 and is characterized in that 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 3b is formed in the valve sleeve 3, a guide sleeve radial hole 6b corresponding to the valve sleeve radial hole 3b is formed in the guide sleeve 6, and a gap 4b is reserved between the rear end face of a valve seat 4 and the front end face of the guide sleeve 6.
The return member 41 is preferably a spring. The contact surfaces between the inner parts of the valve 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.
A check ring 21 is arranged at the rear end of the valve core 2, 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 check 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 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 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.
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 at 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.
And a limiting clamp spring 71a is arranged on the pressure regulating screw 71.
The pressure regulating spring set comprises a first spring 74a and a second spring 74b, and the first spring 74a is sleeved outside the second spring 74 b.
In order to achieve a good throttling effect, the valve core 2 has a relatively long displacement, the design requirement on the pressure regulating spring is relatively high, mainly the length direction is relatively long, the overall length of the control valve is relatively long, and a suitable pressure regulating mechanism must be designed to shorten the total 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 along with the axial direction, so that compression or release of a spring is realized, and the length of the adjusting structure is long. According to the pressure regulating structure adopted by 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 without axial movement, the pressure regulating screw 71 rotates, the pressure regulating screw 71 is limited without axial movement, the pressure regulating nut 73 does not rotate along with the pressure regulating screw 71, the rotation of the pressure regulating screw 71 drives the pressure regulating nut 73 to move axially, and the pressure regulating nut 73 compresses the pressure regulating spring set to realize the pressure regulating effect. The realization mode that pressure regulating nut 73 only axially displaced and not rotated has a variety, and in this embodiment, the periphery of pressure regulating nut 73 is square structure, and four direction straight flutes are processed in valve body 1, and the four corners of pressure regulating nut 73 square structure is assembled in the direction straight flute that corresponds, because the restriction of direction straight flute, pressure regulating nut 73 can only axially displaced and can not rotate in valve body 1. 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 extending end of the pressure regulating screw 71 is provided with a locking nut 76. By means of the matching 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 pressure regulation is finished.
And a radial positioning pin 8 is arranged between the valve sleeve 3 and the guide sleeve 6.
The valve body 1 is externally provided with a mounting thread 11. The control valve is inserted by the aid of the mounting threads 11, mounting space is small, and integration is facilitated.
A section of cylindrical section is arranged between the oil inlet 4a and the oil return opening 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 opening 3a and is used for being in threaded connection with the inner side of the mounting hole.
The working principle is as follows:
the invention adopts a thread plug-in type three-way structure, namely three working ports are arranged, the end surface is an oil inlet 4a (namely a load port), and the side surface is an oil return port 3a and a control port 1 a; 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, the oil return port 3a has an effect of supplying oil to the load port (the oil inlet 4a) as the 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 oil circuit connection from the oil inlet 4a to the oil return port 3a is realized.
The valve sleeve 3 is provided with a step hole for placing the valve seat 4, the reset part 41 and the guide sleeve 6, the left excircle of the valve sleeve 3 is provided with a valve sleeve radial hole 3b, the guide sleeve 6 is provided with a guide sleeve radial hole 6b communicated with the valve sleeve radial hole 3b, and the guide sleeve 6 is internally and axially provided with the valve core 2. The edge of the right end face of the valve core 2 is matched with the conical sealing opening 42 in the valve seat 4 to form conical surface sealing, and the acting diameter of the sealing 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 limiting sleeve 5, and then the auxiliary sealing device realizes zero leakage sealing. The outer diameter of the valve seat 4 is D4, and the size relation of the diameters is as follows: diameter D4 > diameter D3 > diameter D1 > diameter D2.
The conical cavity 2d is formed in the valve core 2, the conical cavity 2d is matched with the steel ball 75 to ensure that the steel ball 75 is centered, and then the steel ball 75 is matched with the assembling cavity 72a in the spring seat 72 to realize automatic centering of the spring seat 72 and the valve core 2, so that the central axes of the spring seat 72 and the valve core 2 are ensured to be positioned on the same straight line.
This load control valve's initial condition, under the pressure regulating spring compressive force effect, press the right-hand member in case 2 middle sections at the left end of uide bushing 6, make case 2 be in on the right side spacing, disk seat 4 is under the effect of piece 41 that resets, and the toper sealing port 42 of its left end forms the line with case 2's right-hand member face arris edge and seals to realize that the conical surface is sealed, at this moment, leave the clearance between 4 left end faces of disk seat and the 6 right-hand member faces of uide bushing.
When pressure oil enters from the oil inlet 4a, the pressure oil enters the pressure regulating spring accommodating cavity through the first channel 2a and the second channel 2b on the valve core 2 and the first damping hole 21a on the retainer ring 21, acts on the area of an annular ring between the diameter D1 and the diameter D2, and is compared with the compression force of the pressure regulating spring to realize the pressure regulation of the oil inlet 4 a.
When pressure oil enters from the oil return opening 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 an annular belt between the diameter D1 and the diameter D4, overcomes the leftward precompression force of the reset piece 41, pushes the valve seat 4 to move rightwards, opens a passage between the oil return opening 3a and the oil inlet 4a, and continuously changes the opening size from 0 in the opening process.
When pressure oil enters from the control port 1a, the pressure oil enters the second control cavity 6a through the second damping hole 5b on the limiting sleeve 5, the pressure acts on the area of an annular belt between the diameter D3 and the diameter D1, the rightward compression force of a pressure regulating spring is overcome, the valve core 2 is pushed to move leftward, and the conical surface seal formed between the valve core 2 and the valve seat 4 and the covering amount of the radial hole 6b of the guide sleeve on the guide sleeve 6 are opened; the amount of leftward movement of the valve element 2 can be adjusted by adjusting the pressure of the control port 1a, thereby adjusting the open flow area.
The right end face of the guide sleeve 6 is a limiting position for leftward movement of the valve seat 4, the guide sleeve radial holes 6b in the guide sleeve 6 and the valve sleeve radial holes 3b in the valve sleeve 3 correspond to each other one by one to form a passage, and when the valve core 2 moves axially, continuous change of the flow area is achieved by covering or opening the guide sleeve radial holes 6 b. The valve sleeve 3 and the guide sleeve 6 are limited to rotate relatively by the radial positioning pin 8, and the smooth passage of the corresponding radial hole is ensured.
According to the control valve, the change gradient of the flow 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 conditions can be better matched.
While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the present invention.
Claims (10)
1. The utility model provides a use stable combination load control valve, including valve body (1) and case (2), valve body (1) on be provided with control mouth (1a), characterized by: the valve body (1) is provided with a valve sleeve (3), an oil return port (3a) is radially formed in the valve sleeve (3), a valve seat (4) capable of moving axially is assembled in the valve sleeve (3), a reset piece (41) is arranged between the valve seat (4) and the valve sleeve (3), an oil inlet (4a) is axially formed in the valve seat (4), the valve core (2) is assembled in the valve sleeve (3) in an axially moving manner, and a conical sealing port (42) matched with the valve core (2) is formed in the front of the valve seat (4); valve body (1) internal fixation have stop collar (5), stop collar (5) with be provided with uide bushing (6) between valve barrel (3), valve barrel (3) on be provided with valve barrel radial hole (3b), uide bushing (6) on be provided with corresponding uide bushing radial hole (6b) in valve barrel radial hole (3b), the rear end face of disk seat (4) with leave clearance (4b) between the preceding terminal surface of uide bushing (6).
2. A combination load control valve using stability as defined in claim 1, wherein: a check ring (21) is arranged at the rear end of the valve core (2), 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 check ring (21); the valve element (2) and be provided with first control between stop collar (5) and hold chamber (5a), valve element (2) with be provided with second control between uide bushing (6) and hold chamber (6a), valve element (2) in be provided with third passageway (2c) that first control of intercommunication holds chamber (5a) and second control and hold chamber (6a), stop collar (5) on be provided with control mouthful (1a) communicating second damping hole (5b), second control hold chamber (6a) with second damping hole (5b) communicate with each other.
3. A combination load control valve using stability as defined in claim 1, wherein: valve body (1) on be provided with pressure regulating mechanism, pressure regulating mechanism including pressure regulating screw (71) and with valve core (2) looks butt spring holder (72), spacing assembly in valve body (1) of pressure regulating screw (71), pressure regulating screw (71) on the spiro union have pressure regulating nut (73), pressure regulating nut (73) with be provided with pressure regulating spring group between spring holder (72), pressure regulating nut (73) can axial displacement nevertheless assemble in valve body (1) unrotatably.
4. A combination load control valve using stability as defined in claim 3, wherein: 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).
5. A combination load control valve using stability as defined in claim 4, wherein: 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.
6. A combination load control valve using stability as defined in claim 5, wherein: and a limiting clamp spring (71a) is arranged on the pressure regulating screw (71).
7. A combination load control valve using stability as defined in claim 6, wherein: the pressure regulating spring set comprises a first spring (74a) and a second spring (74b), and the first spring (74a) is sleeved outside the second spring (74 b).
8. A combination load control valve using stability as defined in claim 7, wherein: and a locking nut (76) is assembled at the extending end of the pressure regulating screw (71).
9. A combination load control valve with stability according to any one of claims 1 to 8, wherein: and a radial positioning pin (8) is arranged between the valve sleeve (3) and the guide sleeve (6).
10. A combination load control valve using stability as defined in claim 9, wherein: and a mounting thread (11) is arranged outside the valve body (1).
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 true CN113719491A (en) | 2021-11-30 |
| CN113719491B CN113719491B (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111029586.0A Active CN113719491B (en) | 2021-09-03 | 2021-09-03 | Use stable combination load control valve |
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| 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 |
|---|---|
| CN113719491B (en) | 2023-12-15 |
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