CN108361235B - Compact hydraulic control back pressure valve and control method thereof - Google Patents
Compact hydraulic control back pressure valve and control method thereof Download PDFInfo
- Publication number
- CN108361235B CN108361235B CN201810372992.9A CN201810372992A CN108361235B CN 108361235 B CN108361235 B CN 108361235B CN 201810372992 A CN201810372992 A CN 201810372992A CN 108361235 B CN108361235 B CN 108361235B
- Authority
- CN
- China
- Prior art keywords
- oil
- valve core
- control
- hole
- spring
- 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.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/029—Counterbalance valves
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Safety Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model provides a compact hydraulically-controlled backpressure valve and control method thereof, the oil inlet and the oil-out of valve body set up respectively on the opposite both ends of valve body, realized compact structure, it is more convenient to install, has realized simultaneously that two way outer oil receiving mouths are arranged, thereby be provided with first external hydraulic fluid port, the action of the control case of second outer oil receiving mouth control valve body in the through-flow valve core respectively on the valve body thereby realize the pretightning force of the sealed oil inlet of regulation resistance piece, realized the control of three-position two-way of backpressure valve.
Description
Technical Field
The invention relates to a compact hydraulic control back pressure valve and a control method thereof, in particular to control of main oil return pressure of a multi-way valve group.
Technical Field
In order to prevent the suction of a rotary motor of a hydraulic actuator in a hydraulic excavator, a back pressure valve needs to be added on an oil supplementing path of a hydraulic system, so that the back pressure of return oil from a hydraulic multi-way valve set to a hydraulic oil tank is high enough to ensure the oil supplement in the braking process of the rotary motor, and the rotary motor can be effectively protected, but the back pressure of the whole system is overhigh due to overhigh pressure of a first back pressure valve, the set value of the back pressure valve is generally more than 2.5bar, the average working pressure in actual working reaches more than 4.0bar, and the peak value reaches about 7.0bar, so that the pressure of the whole system is increased, and unnecessary power loss is caused.
In order to reduce the power loss, functionally, as shown in a two-position two-way valve in fig. 4, an external control oil port is added on the basis of the existing two-position two-way valve, so that the three-position two-way function is realized; structurally, as shown in the existing hydraulic control back pressure valve in fig. 1, the oil inlet and return port of the existing oil return back pressure valve presents a 90-degree included angle, so that the corresponding oil pipe has to be adjusted by 90 degrees when the pipeline is arranged, and the design difficulty is increased and the installation and fixation are not facilitated.
Disclosure of Invention
The invention solves the defects of the prior art, provides the compact hydraulic control back pressure valve which has the advantages of compact structure, more convenient installation, realization of arrangement of two paths of external oil receiving ports, realization of the function of high flow and low pressure loss, and the control method thereof.
The compact hydraulic control backpressure valve comprises a valve body, wherein an oil inlet and an oil outlet of the valve body are respectively arranged at two opposite ends of the valve body. The oil inlet and the oil outlet are arranged on the same straight line, so that the structure is compact, the installation is more convenient, and the arrangement of two paths of external oil receiving ports is realized.
The valve body is internally provided with a resistance block for sealing the oil inlet at the oil inlet end, a flow valve core is arranged at the oil outlet end in the valve body, a first oil cavity is formed between the resistance block and the flow valve core, a flow passage is arranged on the flow valve core to communicate the first oil cavity with the oil outlet, a valve core hole which is arranged along the direction from the oil inlet to the oil outlet is arranged in the flow valve core, a control valve core is arranged in the valve core hole, the control valve core is in sliding connection with the inner wall of the valve core hole, the head end of the control valve core is arranged in the first oil cavity and is connected with the resistance block through a first spring, the tail end of the control valve core is connected with a plug through a second spring, the head end of the valve core hole is sealed with the flow valve core through a sealing ring, and the tail end of the valve core hole is sealed through the plug.
And a stop nut is screwed on the part of the control valve core arranged in the first oil cavity, and the first spring is arranged between the resistance block and the stop nut.
The resistance block is provided with a guide groove, the control valve core is arranged in the guide groove, and the control valve core is in sliding connection with the inner wall of the guide groove.
The through-flow valve core is in threaded or screw connection with the valve body, and the plug is screwed in the through-flow valve core.
As one implementation mode of the device, a second oil cavity is arranged between the head end of the valve core hole and the control valve core in the valve core hole, and the second oil cavity is connected with a first external oil port arranged on the valve body through a first oil hole arranged on the through-flow valve core.
As another implementation mode of the device, a fourth oil cavity is formed between the tail end of the control valve core in the valve core hole and the plug, and the fourth oil cavity is connected with a second outer oil receiving port arranged on the valve body through a second oil hole arranged on the through-flow valve core.
As a third implementation mode of the device, a second oil cavity is arranged between the head end of the valve core hole and the control valve core in the valve core hole, the second oil cavity is connected with a first external oil port arranged on the valve body through a first oil hole arranged on the through-flow valve core, a fourth oil cavity is formed between the tail end of the control valve core in the valve core hole and the plug, and the fourth oil cavity is connected with a second external oil port arranged on the valve body through a second oil hole arranged on the through-flow valve core.
The through-flow valve core comprises an outer pipe and an inner pipe, the outer pipe is fixed on the inner pipe through a plurality of reinforcing ribs which are uniformly distributed, and the first oil hole and the second oil hole are formed in the reinforcing ribs.
A control method of a compact hydraulic control back pressure valve comprises the following three conditions,
A. the external control oil enters from the first external oil port, the pressure oil in the second oil cavity is increased, so that the control valve core is controlled to move towards the second spring to compress the second spring, the pretightening force of the first spring is reduced, the resistance block is separated from the oil inlet until the resistance block does not form resistance to the oil entering the first oil cavity from the oil inlet, and the oil path is completely conducted;
b: the external control oil enters from the second control oil port, the pressure oil in the fourth oil cavity is increased, so that the control valve core is controlled to move towards the first spring to compress the first spring, the pressure of the resistance block to the oil inlet is increased, the overflow area from the oil inlet to the first oil cavity is reduced, and the back pressure of oil return is increased;
c: the external control oil liquid of the first external oil port and the second external oil port is cancelled, and the control valve core realizes the action of normal back pressure under the combined action of the first spring and the second spring.
By adopting the structure, the invention has the following advantages:
1. the oil inlet and the oil outlet are arranged on the same straight line, so that the structure is compact, the installation is more convenient, and the arrangement of two paths of external oil receiving ports is realized;
2. the through-flow valve core structure of the oil inlet and outlet oil ways ensures that the oil inlet and outlet are on the same straight line, and simultaneously realizes the function of normal back pressure;
3. the control of three-position two-way of the back pressure valve is realized through the first external oil port and the second external oil port;
4. on the basis of the existing compact structure, the structural forms of the first external oil port and the second external oil port are obviously improved, and the control of the three-position two-way valve on the basis of the compact structure is realized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Figure 2 three-position two-way back pressure valve principle.
FIG. 3 is a block diagram of a flow through valve core.
Fig. 4 is a diagram of a single first external port structure.
Fig. 5 is a diagram of the structure of the second external oil port alone.
In the attached drawings, 1. A resistance block; 2. a first spring; 3. a control valve core; 4. a vent valve core; 5. a valve body; sixthly, plugging; 7. an oil inlet; 8. a first oil chamber; 9. a second oil chamber; 10. a first oil hole; 11. a third oil chamber; 12. the first external oil port; 14. a fourth oil chamber; 15. a second oil hole; 16. a fifth oil chamber; 17. a second external oil receiving port; 18. an overflow oil passage; 19. an oil outlet; a 20 stop nut; and 21 a second spring.
Detailed Description
The back door tilting and sealing device according to the present invention will be further described with reference to the accompanying drawings and embodiments:
embodiment one:
as shown in fig. 1-5, a compact hydraulic control back pressure valve comprises a valve body 5, wherein an oil inlet 7 and an oil outlet 19 of the valve body 5 are respectively arranged at two opposite ends of the valve body. The valve is characterized in that a resistance block 1 for sealing an oil inlet is arranged at an oil inlet end in the valve body 5, a through-flow valve core 4 is arranged at an oil outlet end in the valve body 5, the through-flow valve core is rotatably arranged in the valve body, a first oil cavity 8 is formed between the resistance block 1 and the through-flow valve core 4 by the valve body 5, a through-flow channel 18 is arranged on the through-flow valve core 4 to communicate the first oil cavity 8 with an oil outlet 19, a valve core hole which is arranged in the direction from the oil inlet to the oil outlet is arranged in the through-flow valve core 4, a control valve core 3 is arranged in the valve core hole, the control valve core 3 is in sliding connection with the inner wall of the valve core hole, the head end of the control valve core 3 is connected with the resistance block 1 through a first spring 2, the tail end of the control valve core 3 is connected with a plug 6 through a second spring 21, the head end of the valve core hole is sealed with the through a sealing ring between the control valve core 3 and the through the plug 6, the tail end of the control valve core 6 is rotatably arranged in the through-flow valve core, a stop nut 20 is arranged on the part of the control valve core 3 which is arranged in the first oil cavity, and the stop nut 20 is arranged between the first spring 2 and the stop nut 20. The resistance block 1 is provided with a guide groove, the control valve core is arranged in the guide groove, and the control valve core is in sliding connection with the inner wall of the guide groove.
Embodiment two:
the valve core is characterized in that a second oil cavity 9 is arranged between the head end of the valve core hole and the control valve core in the valve core hole, and the second oil cavity 9 is connected with a first external oil port 12 arranged on the valve body through a first oil hole 10 and a third oil cavity 11 arranged on the through-flow valve core.
Embodiment III:
a fourth oil cavity 14 is formed between the tail end of the control valve core in the valve core hole and the plug, and the fourth oil cavity 14 is connected with a second outer oil receiving port 17 arranged on the valve body through a second oil hole and a fifth oil cavity 16 arranged on the through-flow valve core.
Embodiment four:
the valve core is characterized in that a second oil cavity is arranged between the head end of the valve core hole and the control valve core in the valve core hole, the second oil cavity is connected with a first external oil port arranged on the valve body through a first oil hole arranged on the through-flow valve core, a fourth oil cavity is formed between the tail end of the control valve core in the valve core hole and the plug, and the fourth oil cavity is connected with a second external oil receiving port arranged on the valve body through a second oil hole arranged on the through-flow valve core.
In the above embodiment, the through-flow valve core includes an outer tube and an inner tube, the outer tube is fixed on the inner tube by a plurality of evenly distributed reinforcing ribs, and the first oil hole and the second oil hole are disposed in the reinforcing ribs.
The through-flow valve core 4 and the valve body 5 cooperate to form a third oil chamber 11 and a fifth oil chamber 16.
When the oil inlet 7 is filled with oil, the oil inlet amount of the oil is controlled by the resistance block 1, the oil inlet amount of the oil is determined according to the pretightening force of the first spring 2 and the pretightening force of the second spring 21, and the pretightening force of the first spring 2 is determined by the stroke or the moving amount of the control valve core 3. The oil enters the first oil cavity 8 from the oil inlet 7, then enters the overflow oil channel 18 of the through-flow valve core 4, and finally is discharged through the oil outlet 19.
Case one: when the external control oil enters the first external oil port 12, the external control oil enters the first oil hole 10 in the through-flow valve core 4 through the first oil cavity 11 and then enters the second oil cavity 9, acts on the left section of the control valve core 3, and makes the control valve core 3 move rightwards under the action of pressure, the pretightening force of the first spring 2 is reduced, when the control valve core 3 reaches a certain stroke, the flow area of the oil inlet 7 entering the first oil cavity is large enough and insufficient to form resistance, and at the moment, the oil circuit is completely conducted and is regarded as the left position of the position of FIG. 3. The pressure of the external control oil is regulated, so that the stroke of the second spring 21 is controlled, different positions of the control valve core 3 can be obtained, and the overflow area from the oil inlet 7 to the first oil cavity 8 is gradually reduced until the overflow area reaches 0.
And a second case: when the external control oil way enters the second control oil port 17, then enters the fifth oil cavity 16, enters the fourth oil cavity through the second oil hole 15, and when the external control pressure rises, the control valve core 3 moves leftwards to compress the first spring 2, so that the overflow area from the oil inlet 7 to the first oil cavity 8 is reduced, the pretightening force is increased, and the oil return back pressure is increased; when the external control pressure is large enough, the oil path from the oil inlet 7 to the first oil cavity 8 is completely blocked, and the oil in the oil inlet 7 cannot enter the first oil cavity 8, so that the right function as shown in fig. 3 is realized.
And a third case: when the external control pressures of the first external oil port 12 and the second external oil port 17 are cancelled, the control valve core 3 is under a certain pretightening force under the combined action of the first spring 2 and the second spring 21, so that the effect of normal back pressure is realized.
Based on the first, second and third conditions, the invention realizes the functions of the control modes of the three positions shown in fig. 3, and can realize the gradual change process of the analog input signals (the first external oil port 12 and the second external oil port 17) by the functions of the 5 on the basis, and is not limited to the digital input signals of the three positions.
Claims (9)
1. The utility model provides a compact hydraulically controlled backpressure valve, includes valve body, its characterized in that: the oil inlet and the oil outlet of the valve body are respectively arranged at two opposite ends of the valve body;
the valve body is internally provided with a resistance block for sealing the oil inlet at the oil inlet end, a flow valve core is arranged at the oil outlet end in the valve body, a first oil cavity is formed between the resistance block and the flow valve core, a flow passage is arranged on the flow valve core to communicate the first oil cavity with the oil outlet, a valve core hole which is arranged along the direction from the oil inlet to the oil outlet is arranged in the flow valve core, a control valve core is arranged in the valve core hole, the control valve core is in sliding connection with the inner wall of the valve core hole, the head end of the control valve core is arranged in the first oil cavity and is connected with the resistance block through a first spring, the tail end of the control valve core is connected with a plug through a second spring, the head end of the valve core hole is sealed with the flow valve core through a sealing ring, and the tail end of the valve core hole is sealed through the plug.
2. The compact pilot-operated backpressure valve of claim 1, wherein: and a stop nut is screwed on the part of the control valve core arranged in the first oil cavity, and the first spring is arranged between the resistance block and the stop nut.
3. The compact pilot-operated backpressure valve of claim 2, wherein: the resistance block is provided with a guide groove, the control valve core is arranged in the guide groove, and the control valve core is in sliding connection or fixed connection with the inner wall of the guide groove.
4. A compact pilot-operated back pressure valve as defined in claim 3, wherein: the through-flow valve core is in threaded or screw connection with the valve body, and the plug is screwed in the through-flow valve core.
5. The compact pilot-operated backpressure valve of one of claims 1 to 4, wherein: the valve core hole is internally provided with a second oil cavity between the head end of the valve core hole and the control valve core, and the second oil cavity is connected with a first external oil port arranged on the valve body through a first oil hole arranged on the through-flow valve core.
6. The compact pilot-operated backpressure valve of one of claims 1 to 4, wherein: a fourth oil cavity is formed between the tail end of the control valve core in the valve core hole and the plug, and the fourth oil cavity is connected with a second outer oil receiving port arranged on the valve body through a second oil hole arranged on the through-flow valve core.
7. The compact pilot-operated backpressure valve of claim 5, wherein: a fourth oil cavity is formed between the tail end of the control valve core in the valve core hole and the plug, and the fourth oil cavity is connected with a second outer oil receiving port arranged on the valve body through a second oil hole arranged on the through-flow valve core.
8. The compact pilot-operated backpressure valve of claim 7, wherein: the through-flow valve core comprises an outer pipe and an inner pipe, the outer pipe is fixed on the inner pipe through two or more reinforcing ribs which are uniformly distributed, and the first oil hole and the second oil hole are formed in the reinforcing ribs.
9. A control method of a compact pilot-controlled back pressure valve comprising the compact pilot-controlled back pressure valve according to claim 7 or 8, characterized in that: including the following three cases,
A. the external control oil enters from the first external oil port, the pressure oil in the second oil cavity is increased, so that the control valve core is controlled to move towards the second spring to compress the second spring, the pretightening force of the first spring is reduced, the resistance block is separated from the oil inlet until the resistance block does not form resistance to the oil entering the first oil cavity from the oil inlet, and the oil path is completely conducted;
b: the external control oil enters from the second control oil port, the pressure oil in the fourth oil cavity is increased, so that the control valve core is controlled to move towards the first spring to compress the first spring, the pressure of the resistance block to the oil inlet is increased, the overflow area from the oil inlet to the first oil cavity is reduced, and the back pressure of oil return is increased;
c: the external control oil liquid of the first external oil port and the second external oil port is cancelled, and the control valve core realizes the action of normal back pressure under the combined action of the first spring and the second spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810372992.9A CN108361235B (en) | 2018-04-24 | 2018-04-24 | Compact hydraulic control back pressure valve and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810372992.9A CN108361235B (en) | 2018-04-24 | 2018-04-24 | Compact hydraulic control back pressure valve and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108361235A CN108361235A (en) | 2018-08-03 |
| CN108361235B true CN108361235B (en) | 2023-09-08 |
Family
ID=63008854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810372992.9A Active CN108361235B (en) | 2018-04-24 | 2018-04-24 | Compact hydraulic control back pressure valve and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108361235B (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2163913Y (en) * | 1993-04-23 | 1994-05-04 | 姜德林 | Two-way counterbalance valve |
| US5676169A (en) * | 1996-01-24 | 1997-10-14 | Power Team Division Of Spx Corporation | Counterbalance valve |
| JP2000346004A (en) * | 1999-06-02 | 2000-12-12 | Kubota Corp | Counterbalance valve structure for working machine |
| JP2003097747A (en) * | 2001-09-26 | 2003-04-03 | Asahi Organic Chem Ind Co Ltd | Back pressure valve |
| CN2588103Y (en) * | 2002-11-26 | 2003-11-26 | 张勇 | Energy-saving self-locking hydraulic controlled one direction multi-way change valve |
| CN102135118A (en) * | 2011-04-17 | 2011-07-27 | 常德中联重科液压有限公司 | Hydraulic control component and control circuit with same |
| CN202039816U (en) * | 2011-05-11 | 2011-11-16 | 江苏金石富源机械有限公司 | Bidirectional back pressure valve |
| CN202531513U (en) * | 2012-05-10 | 2012-11-14 | 合肥长源液压股份有限公司 | Back pressure valve for hydraulic oil return system |
| CN103470562A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | High-frequency counterbalance valve and counterbalancing method thereof |
| CN103727086A (en) * | 2014-01-20 | 2014-04-16 | 南京工程学院 | Hydraulically-controlled proportional valve |
| CN203809759U (en) * | 2014-04-25 | 2014-09-03 | 徐工集团工程机械股份有限公司 | Back pressure valve |
| CN104047918A (en) * | 2014-07-17 | 2014-09-17 | 圣邦集团有限公司 | Duplex check valve |
| CN104528555A (en) * | 2014-12-19 | 2015-04-22 | 中联重科股份有限公司 | Main arm variable amplitude controlling system for crane and crane |
| CN104632747A (en) * | 2015-01-27 | 2015-05-20 | 西京学院 | Hydraulic balance valve |
| CN204783911U (en) * | 2015-06-24 | 2015-11-18 | 湖南凯恩利液压机械制造有限公司 | Liquid accuse return oil pressure valve |
| CN105387016A (en) * | 2015-12-21 | 2016-03-09 | 山河智能装备股份有限公司 | Hydraulic control back pressure valve for engineering machinery |
| CN205349901U (en) * | 2016-02-02 | 2016-06-29 | 南京航海仪器二厂有限公司 | Back pressure valve |
| CN208381015U (en) * | 2018-04-24 | 2019-01-15 | 山河智能装备股份有限公司 | A kind of compact hydraulic control counterbalance valve |
-
2018
- 2018-04-24 CN CN201810372992.9A patent/CN108361235B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2163913Y (en) * | 1993-04-23 | 1994-05-04 | 姜德林 | Two-way counterbalance valve |
| US5676169A (en) * | 1996-01-24 | 1997-10-14 | Power Team Division Of Spx Corporation | Counterbalance valve |
| JP2000346004A (en) * | 1999-06-02 | 2000-12-12 | Kubota Corp | Counterbalance valve structure for working machine |
| JP2003097747A (en) * | 2001-09-26 | 2003-04-03 | Asahi Organic Chem Ind Co Ltd | Back pressure valve |
| CN2588103Y (en) * | 2002-11-26 | 2003-11-26 | 张勇 | Energy-saving self-locking hydraulic controlled one direction multi-way change valve |
| CN102135118A (en) * | 2011-04-17 | 2011-07-27 | 常德中联重科液压有限公司 | Hydraulic control component and control circuit with same |
| CN202039816U (en) * | 2011-05-11 | 2011-11-16 | 江苏金石富源机械有限公司 | Bidirectional back pressure valve |
| CN202531513U (en) * | 2012-05-10 | 2012-11-14 | 合肥长源液压股份有限公司 | Back pressure valve for hydraulic oil return system |
| CN103470562A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | High-frequency counterbalance valve and counterbalancing method thereof |
| CN103727086A (en) * | 2014-01-20 | 2014-04-16 | 南京工程学院 | Hydraulically-controlled proportional valve |
| CN203809759U (en) * | 2014-04-25 | 2014-09-03 | 徐工集团工程机械股份有限公司 | Back pressure valve |
| CN104047918A (en) * | 2014-07-17 | 2014-09-17 | 圣邦集团有限公司 | Duplex check valve |
| CN104528555A (en) * | 2014-12-19 | 2015-04-22 | 中联重科股份有限公司 | Main arm variable amplitude controlling system for crane and crane |
| CN104632747A (en) * | 2015-01-27 | 2015-05-20 | 西京学院 | Hydraulic balance valve |
| CN204783911U (en) * | 2015-06-24 | 2015-11-18 | 湖南凯恩利液压机械制造有限公司 | Liquid accuse return oil pressure valve |
| CN105387016A (en) * | 2015-12-21 | 2016-03-09 | 山河智能装备股份有限公司 | Hydraulic control back pressure valve for engineering machinery |
| CN205349901U (en) * | 2016-02-02 | 2016-06-29 | 南京航海仪器二厂有限公司 | Back pressure valve |
| CN208381015U (en) * | 2018-04-24 | 2019-01-15 | 山河智能装备股份有限公司 | A kind of compact hydraulic control counterbalance valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108361235A (en) | 2018-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201786797U (en) | Excavator load sensitive pressure compensation multi-way valve | |
| CN107268703B (en) | Hydraulic system of loader | |
| CN102865387A (en) | Electric proportional multi-way valve | |
| CN202251173U (en) | Non-differential floating double-cylinder assembly | |
| CN108361235B (en) | Compact hydraulic control back pressure valve and control method thereof | |
| CN205715031U (en) | A kind of multiple directional control valve of band mechanical release device | |
| CN109306976B (en) | Load sensitive control system | |
| CN2839687Y (en) | Two-position six-way guiding reversing valve | |
| CN208381015U (en) | A kind of compact hydraulic control counterbalance valve | |
| WO2021169175A1 (en) | Oilway structure for achieving precise control of double-acting cylinder | |
| CN106762991A (en) | The electromechanical actuator of the hydraulic control with steady regulatory function | |
| CN209414295U (en) | A kind of logical valve | |
| CN201513403U (en) | Multistage cylinder integrated control hydraulic valve group | |
| CN202790680U (en) | Electronic controlled proportional multi-way valve | |
| CN212429388U (en) | Load-sensitive multi-way valve bank | |
| CN201896806U (en) | Superposed type balance valve | |
| CN103644332B (en) | A kind of revolution Foot braking valve | |
| CN208431215U (en) | A kind of Operating Pressure lift controlling system | |
| CN203488466U (en) | Dual-control multi-position reversing hydraulic device | |
| CN111810483A (en) | Electro-hydraulic valve reversing anti-impact structure | |
| CN106678112B (en) | A kind of underwater cylinder control system | |
| CN202833374U (en) | Electro-hydraulic reversing valve with adjustable oil drainage way | |
| CN211231766U (en) | High-performance copper-zinc alloy pneumatic electromagnetic valve seat | |
| CN213540900U (en) | Novel no back pressure type low pressure shut-off valve | |
| CN203614820U (en) | Rotation pedal brake valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |