CN104454736B - A kind of load holding valve and method of work thereof - Google Patents
A kind of load holding valve and method of work thereof Download PDFInfo
- Publication number
- CN104454736B CN104454736B CN201410777274.1A CN201410777274A CN104454736B CN 104454736 B CN104454736 B CN 104454736B CN 201410777274 A CN201410777274 A CN 201410777274A CN 104454736 B CN104454736 B CN 104454736B
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- valve
- oil
- oil duct
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- valve seat
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000013016 damping Methods 0.000 claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 140
- 239000010720 hydraulic oil Substances 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 16
- 210000000683 abdominal cavity Anatomy 0.000 claims description 11
- 238000007912 intraperitoneal administration Methods 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000002828 fuel tank Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004062 sedimentation Methods 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Driven Valves (AREA)
- Check Valves (AREA)
Abstract
The present invention relates to a kind of load holding valve and method of work thereof, including valve body and the valve seat being arranged in valve body, damping spool, poppet valve core, long spool, pilot valve and guide piston; Described valve seat, pilot valve and guide piston are sequentially connected with, and described damping spool is arranged in valve seat, and described long spool is arranged in pilot valve; The poppet valve core of the front end of described long spool is positioned at orifice valve in-core; Described valve body is provided with the first oil duct, the second oil duct, the 3rd oil duct, the 4th oil duct, actuator port, Pi oil-in and oil return opening. Load holding valve of the present invention, the basis of tradition fuel tap carries out finish structure improve, leak its decrease speed of general who has surrendered under the nature of the hydraulic cylinder caused by controlling valve and control in lowest limit, it is possible to be prevented effectively from the problem that swing arm settling amount is excessive, it is achieved that swing arm declines and controls preferably. Load holding valve design concept of the present invention is ingenious, simple in construction, and substantially, effect is notable in effect.
Description
Technical field
The present invention relates to a kind of load holding valve and method of work thereof, belong to hydraulic power technical field.
Background technology
In existing excavator technology, swing arm connection is to control swing arm settling amount by the sealing in valve body and internal leakage, when swing arm stick returns to middle position, swing arm connection seals and internal leakage can control swing arm and naturally fall, swing arm is made to be maintained in position, but the control of internal leakage is relatively difficult to realize more steady control, swing arm settling amount can be caused unavoidably excessive. This do not have second safeguard procedures to be difficult to control well swing arm settling amount, and swing arm settling amount can be caused unavoidably excessive.
Chinese patent literature CN201232784Y discloses a kind of load holding valve, this valve includes the main valve that valve body, piston, little spring seat, little spring, little moveable door, spool, spring base and spring are constituted, the precursor overflow valve being made up of overflow valve body, overflow spring and the Outflow Valve with oilhole, the guide's choke valve being made up of the one-way throttle valve being arranged in throttling valve pocket and throttling spring, and the one-way relief valves being made up of the big spring seat being arranged in work oil duct, big spring, big valve and valve plug. This valve is arranged on operating cylinder and is connected with operating cylinder without by oil pipe, mainly eliminates pocketed oil phenomenon and eliminates the accident potential that oil pipe burst causes. But it is excessive that this valve is not solved by swing arm settling amount, the problem controlling swing arm sedimentation.
Therefore, need a kind of control valve declined for swing arm of design badly, make the interior leakage of valve body be controlled, to reach to control the purpose that swing arm declines.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of load holding valve.
The present invention also provides for the method for work of a kind of above-mentioned load holding valve.
Technical scheme is as follows:
A kind of load holding valve, including valve body and the main valve plug being arranged in valve body, described valve body includes abdominal cavity, sets gradually valve seat, pilot valve and guide piston from left to right at described intraperitoneal;
Described valve body is provided with actuator port, Pi oil-in, oil return opening, the first oil duct, the second oil duct, the 3rd oil duct and the 4th oil duct;
Described valve seat and the second oil duct cooperatively form sealing structure, stop the hydraulic oil in the second oil duct to enter the 3rd oil duct, when valve seat moves to right, open sealing structure, make the hydraulic oil in the second oil duct enter the 3rd oil duct; Being provided with the first spout hole on described valve seat, described first spout hole and the second oil duct communicate; Being provided with the second spout hole in described pilot valve, described second spout hole and the first oil duct communicate; Being provided with the 3rd spout hole on described guide piston, the horizontal center line of described guide piston is provided with cavity, the right-hand member of described cavity is connected with the 3rd described spout hole;
The centrage of described pilot valve is provided through long spool, described long spool left end poppet valve core is set, described poppet valve core is positioned at valve seat, described poppet valve core and pilot valve cooperatively form and seal in the hydraulic oil entrance pilot valve that structure stops in valve seat, when poppet valve core moves to left, make the hydraulic oil in valve seat enter and enter in the first oil duct by the second spout hole in pilot valve;
Described main valve plug is provided with cannelure, when main valve plug moves to right, is connected the 3rd oil duct and the 4th oil duct by cannelure.
Preferably, damping spool it is provided with in described valve seat, the left end of described damping spool arranges fuel feed hole, the right-hand member of described damping spool arranges damping spring, described poppet valve core is provided with packing ring, the front end of described poppet valve core is positioned at orifice valve core inner after running through damping spring, described packing ring is connected with damping spring.
Preferably, described pilot valve being additionally provided with drain pan, described drain pan and the first oil duct and communicates, described second spout hole is positioned at drain pan.
Preferably, the profile of described guide piston arranges the cylinder that is stepped.
Preferably, described valve body also including check valve, described check valve is arranged in the first oil duct. The advantage of this design is in that, check valve plays the effect that one-way flow reversely ends, and the hydraulic oil flow that its purpose is to make to flow in the first oil duct from the second spout hole is to the 3rd oil duct, it is prevented that the hydraulic oil in the first oil duct reversely flows back to.
Preferably, described valve body also includes the first plug screw, and described first plug screw is arranged at the right side of guide piston in order to block abdominal cavity.
Preferably, described valve body also includes the second plug screw, and described second plug screw is arranged on check valve side. The advantage of this design is in that, increases the convenient maintenance of the second plug screw of design or changes check valve.
Preferably, described valve body also includes pilot valve chamber, and described pilot valve chamber is connected with described abdominal cavity. The advantage of this design is in that, is discharged by hydraulic oil unnecessary for intraperitoneal by pilot valve chamber, it is prevented that useless hydraulic oil gathers at intraperitoneal.
Preferably, between described guide piston and pilot valve, guide's spring it is provided with.
The method of work of a kind of load holding valve, comprises the steps,
(1) when the logical guide oil of main valve plug left end, guide oil promotes main valve plug to move to right, now cannelure connection the 3rd oil duct and the 4th oil duct, and a part of guide oil enters Pi oil-in simultaneously;
(2) guide oil entering Pi oil-in promotes guide piston to overcome the resistance of guide's spring to be moved to the left, and guide oil is entered into by the 3rd spout hole and forms hydraulic oil in guide piston cavity;
(3) entering the hydraulic oil in guide piston cavity promotes long spool to move to left, long spool promotes poppet valve core to make poppet valve core open with the sealing structure that pilot valve is formed, poppet valve core compression damping spring simultaneously, hydraulic oil in valve seat enters the first oil duct through pilot valve cavity by the second spout hole, and the hydraulic oil in the first oil duct is by entering fuel tank by oil return opening after flowing through the 3rd oil duct, cannelure and the 4th oil duct successively after check valve;
(4) after the hydraulic oil in valve seat is released, oil pressure outside valve seat, more than the oil pressure in valve seat, produces pressure reduction inside and outside valve seat, and this pressure reduction promotes valve seat to move to right, open valve seat and the sealing structure of the second oil duct formation, make the second oil duct and the 3rd oil duct communicate.
The beneficial effects of the present invention is:
Load holding valve of the present invention, the basis of tradition fuel tap carries out finish structure improve, leak its decrease speed of general who has surrendered under the nature of the hydraulic cylinder caused by controlling valve and control in lowest limit, it is possible to be prevented effectively from the problem that swing arm settling amount is excessive, it is achieved that swing arm declines and controls preferably. Load holding valve design concept of the present invention is ingenious, simple in construction, and substantially, effect is notable in effect.
Accompanying drawing explanation
Fig. 1 be in load holding valve of the present invention second oil duct and the 3rd oil duct isolation before sectional structure schematic diagram;
Fig. 2 be in load holding valve of the present invention second oil duct and the 3rd oil duct communicate after sectional structure schematic diagram;
Fig. 3 is load holding valve operation principle schematic diagram of the present invention;
Fig. 4 is the structural representation of valve seat in load holding valve of the present invention;
Fig. 5 is the structural representation of guide piston in load holding valve of the present invention;
Fig. 6 is the schematic enlarged-scale view of part A in Fig. 5.
Wherein: 1, valve body, 2, guide piston, 3, pilot valve, 4, check valve, 5, long spool, 6, poppet valve core, 7, damping spool, 8, valve seat, 9, damping spring, 10, guide's spring, 11, first plug screw, 12, second plug screw, 13, packing ring, 14, main valve plug, 15, first oil duct, 16, second oil duct, 17, pilot valve chamber, 18, drain pan, 19, first spout hole, 20, 3rd oil duct, 21, 4th oil duct, 22, cannelure, 23, Pi oil-in, 24, second spout hole, 25, cavity, 26, 3rd spout hole, 27, actuator port, 28, oil return opening.
Detailed description of the invention
The present invention will be further described by the examples below and in conjunction with accompanying drawing, but is not limited to this.
Embodiment 1:
A kind of load holding valve provided by the invention, including valve body 1 and the main valve plug 14 being arranged in valve body, valve body includes abdominal cavity, sets gradually valve seat 8, pilot valve 3 and guide piston 2 from left to right at described intraperitoneal;
Valve body 1 is provided with actuator port 27, Pi oil-in 23, oil return opening the 28, first oil duct the 15, second oil duct the 16, the 3rd oil duct 20 and the 4th oil duct 21;
Abdominal cavity is all connected with the second oil duct 16 and the 3rd oil duct 20, the left end of valve seat 8 and the inwall of the second oil duct 16 match and form cone sealing structure, the hydraulic oil in the second oil duct 16 is stoped to enter the 3rd oil duct 20, when valve seat 8 moves to right, the left end of valve seat 8 and the inwall of the second oil duct 16 are separated, open sealing structure, make the hydraulic oil in the second oil duct 16 enter the 3rd oil duct 20; Being provided with the first spout hole 19 on valve seat 8, the first spout hole 19 communicates with the second oil duct 16, it is ensured that it is internal that the hydraulic oil in the second oil duct 16 enters into valve seat 8 by the first spout hole 19, and the hydraulic oil in valve seat 8 carries out pressurize before being released; Being provided with the second spout hole 24 in pilot valve 3, the second spout hole 24 communicates with the first oil duct 15, it is ensured that entering into the hydraulic oil within pilot valve 3 can enter in the first oil duct 15 by the second spout hole 24; Being provided with the 3rd spout hole 26 on guide piston 2, the horizontal center line of guide piston 2 is provided with a cavity 25, the right-hand member of cavity is connected with the 3rd described spout hole 26; When before the illogical guide oil of Pi oil-in 23, the right-hand member of guide piston 2 is closely adjacent with valve interior wall, when Pi oil-in 23 passes into guide's hydraulic fluid port, guide oil promotes guide piston 2 to be moved to the left, and now guide oil is entered in cavity 25 by the 3rd spout hole 26 and acts on long spool 5.
Pilot valve 3 centrage has a through hole running through pilot valve, long spool 5 is arranged in through hole and forms small?gap suture with through hole and coordinates, long spool left end poppet valve core 6 is set, poppet valve core is positioned at valve seat, poppet valve core 6 is used for blocking the left end opening of through hole makes poppet valve core 6 and pilot valve 3 cooperatively form in the hydraulic oil entrance pilot valve 3 sealed in structure prevention valve seat 8, when poppet valve core 6 moves to left, poppet valve core 6 is not at the left end opening of closure through hole, now seal structure to be opened, make the hydraulic oil in valve seat 8 enter in pilot valve 3 and enter in the first oil duct by the second spout hole 24,
Wherein, main valve plug is provided with cannelure 22, when main valve plug 14 moves to right, connects the 3rd oil duct 20 and the 4th oil duct 21 by cannelure 22.
The profile of guide piston 2 arranges the cylinder that is stepped, the cylindrical diameter in both sides is identical and diameter less than mediate cylindrical, the right side of guide piston is closely adjacent with the inwall of valve body, the guide oil now flowing into Pi oil-in 23 can contact with the cylindrical outer surface in right side, the shoulder place being acted on mediate cylindrical by guide oil promotes guide piston 2 to be moved to the left, now guide piston forms gap with valve interior wall, and guide oil is controlled by the 3rd spout hole 26 and enters in cavity.
Also including check valve 4 on valve body 1, check valve 4 is arranged in the first oil duct 15. Check valve 4 plays the effect that one-way flow reversely ends, and the hydraulic oil flow that its purpose is to make to flow in the first oil duct from the second spout hole 24 is to the 3rd oil duct, it is prevented that the hydraulic oil in the first oil duct reversely flows back to.
Valve body 1 also includes the first plug screw 11 and the second plug screw 12, and the first plug screw 11 is arranged at the right side of guide piston 2 in order to block abdominal cavity. Second plug screw 12 is arranged on check valve 4 side. The first plug screw 11 increasing design is convenient for changing Intraabdominal parts or cleaning abdominal cavity, and the second plug screw 12 is convenient overhauls or change check valve or cleaning the first oil duct.
Valve body also includes pilot valve chamber 17, pilot valve chamber 17 is connected with described abdominal cavity, pilot valve chamber 17 is arranged between Pi oil-in 23 and the second plug screw 12, by pilot valve chamber, hydraulic oil unnecessary for intraperitoneal is discharged, it is prevented that useless hydraulic oil gathers at intraperitoneal.
Additionally, installation settings guide's spring 10 between described guide piston 2 and pilot valve 3, guide piston 2 does not contact with pilot valve 3 to be left guide's spring 10 for and does elastic space and guide piston 2 does mobile space, it is attached by guide's spring 10, guide's spring 10 is compressed when guide piston 2 is moved to the left, when the obstructed guide oil of Pi oil-in, guide piston moves right by the elastic force of guide's spring and returns to original position.
Embodiment 2:
A kind of load holding valve provided by the invention, structure is as described in Example 1, it is different in that, damping spool 7 it is provided with in valve seat 8, the left end of damping spool 7 arranges fuel feed hole, and the right-hand member of damping spool 7 arranges damping spring 9, and poppet valve core 6 is provided with packing ring 13, the front end of poppet valve core is positioned at damping spool 7 after running through damping spring 9 internal, and packing ring 13 is connected with damping spring 9. When long spool 5 promotes poppet valve core 6 to be moved to the left, packing ring 13 promotes damping spring 9 to compress, and the sealing structure that poppet valve core 6 and pilot valve 3 are formed simultaneously is opened, and now the hydraulic oil in valve seat 8 enters inside pilot valve. When the obstructed guide oil of Pi oil-in, poppet valve core moves right by the elastic restoring force of damping spring, and poppet valve core returns to original position and keeps the sealing structure of poppet valve core and pilot valve.
Embodiment 3:
A kind of load holding valve provided by the invention, as described in Example 1, it is different in that structure, and pilot valve is additionally provided with drain pan 18, and drain pan 18 communicates with the first oil duct 15, and the second spout hole 24 is positioned at drain pan 18. Drain pan has the effect of two aspects, and one is that drain pan opening diameter has bigger flux when communicating with the first oil duct relatively greatly, facilitates and is all introduced into the first oil duct from spout hole hydraulic oil out; Two is that drain pan can gather a part of hydraulic oil of storage, reduces the unnecessary hydraulic oil of intraperitoneal and flows out from pilot valve chamber.
Embodiment 4:
The method of work of a kind of load holding valve, comprises the steps,
(1) when the logical guide oil of main valve plug 14 left end, guide oil promotes main valve plug 14 to move to right, and now cannelure 22 moves to right connection the 3rd oil duct 20 and the 4th oil duct 21, and a part of guide oil is transported to Pi oil-in 23 simultaneously;
(2) guide oil being transported to Pi oil-in 23 promotes guide piston 2 to overcome the resistance of guide's spring 10 to be moved to the left, and guide oil is entered into by the 3rd spout hole 26 and forms hydraulic oil in guide piston 2 cavity;
(3) entering the hydraulic oil in guide piston 2 cavity promotes long spool 5 to move to left, long spool 5 promotes poppet valve core 6 to make poppet valve core 6 open with the sealing structure that pilot valve 3 is formed, poppet valve core 6 compression damping spring 9 simultaneously, hydraulic oil in valve seat 8 enters the first oil duct 15 through internal second spout hole 24 that passes through of pilot valve 3, and the hydraulic oil in the first oil duct 15 is by entering fuel tank by oil return opening 28 after flowing through the 3rd oil duct 20, cannelure 22 and the 4th oil duct 21 successively after check valve 4;
(4) after the hydraulic oil in valve seat 8 is released, oil pressure outside valve seat 8 is more than the oil pressure in valve seat, and at the inside and outside generation pressure reduction of valve seat 8, this pressure reduction promotes valve seat 8 to move to right, open valve seat 8 and the sealing structure of the second oil duct 16 formation, make the second oil duct 16 and the 3rd oil duct 20 communicate.
Pass through the method, a whole set of mechanism being made up of valve seat, pilot valve, guide piston, long spool, poppet valve core is increased in valve body, sealing structure is cooperatively formed by valve seat and the second oil duct inwall, control the hydraulic oil in the second oil duct and enter into flow and the opportunity of the 3rd oil duct, the interior leakage effectively controlling valve is avoided making swing arm settling amount excessive, makes swing arm be held in place well.
Claims (10)
1. a load holding valve, including valve body and the main valve plug being arranged in valve body, it is characterised in that described valve body includes abdominal cavity, sets gradually valve seat, pilot valve and guide piston from left to right at described intraperitoneal;
Described valve body is provided with actuator port, Pi oil-in, oil return opening, the first oil duct, the second oil duct, the 3rd oil duct and the 4th oil duct;
Described valve seat and the second oil duct cooperatively form sealing structure, stop the hydraulic oil in the second oil duct to enter the 3rd oil duct, when valve seat moves to right, open sealing structure, make the hydraulic oil in the second oil duct enter the 3rd oil duct; Being provided with the first spout hole on described valve seat, described first spout hole and the second oil duct communicate; Being provided with the second spout hole in described pilot valve, described second spout hole and the first oil duct communicate; Being provided with the 3rd spout hole on described guide piston, the horizontal center line of described guide piston is provided with cavity, the right-hand member of described cavity is connected with the 3rd described spout hole;
The centrage of described pilot valve is provided through long spool, described long spool left end poppet valve core is set, described poppet valve core is positioned at valve seat, described poppet valve core and pilot valve cooperatively form and seal in the hydraulic oil entrance pilot valve that structure stops in valve seat, when poppet valve core moves to left, make the hydraulic oil in valve seat enter and enter in the first oil duct by the second spout hole in pilot valve;
Described main valve plug is provided with cannelure, when main valve plug moves to right, is connected the 3rd oil duct and the 4th oil duct by cannelure.
2. load holding valve as claimed in claim 1, it is characterized in that, damping spool it is provided with in described valve seat, the left end of described damping spool arranges fuel feed hole, the right-hand member of described damping spool arranges damping spring, being provided with packing ring on described poppet valve core, the front end of described poppet valve core is positioned at orifice valve core inner after running through damping spring, described packing ring is connected with damping spring.
3. load holding valve as claimed in claim 1 or 2, it is characterised in that being additionally provided with drain pan, described drain pan and the first oil duct in described pilot valve and communicate, described second spout hole is positioned at drain pan.
4. load holding valve as claimed in claim 1 or 2, it is characterised in that the profile of described guide piston arranges the cylinder that is stepped.
5. load holding valve as claimed in claim 1 or 2, it is characterised in that also including check valve on described valve body, described check valve is arranged in the first oil duct.
6. load holding valve as claimed in claim 1 or 2, it is characterised in that described valve body also includes the first plug screw, and described first plug screw is arranged at the right side of guide piston in order to block abdominal cavity.
7. load holding valve as claimed in claim 5, it is characterised in that described valve body also includes the second plug screw, and described second plug screw is arranged on check valve side.
8. load holding valve as claimed in claim 1, it is characterised in that described valve body also includes pilot valve chamber, and described pilot valve chamber is connected with described abdominal cavity.
9. load holding valve as claimed in claim 1, it is characterised in that be provided with guide's spring between described guide piston and pilot valve.
10. the method for work of the load holding valve as described in any one of claim 1 to 9, it is characterised in that comprise the steps,
(1) when the logical guide oil of main valve plug left end, guide oil promotes main valve plug to move to right, now cannelure connection the 3rd oil duct and the 4th oil duct, and a part of guide oil enters Pi oil-in simultaneously;
(2) guide oil entering Pi oil-in promotes guide piston to overcome the resistance of guide's spring to be moved to the left, and guide oil is entered into by the 3rd spout hole and forms hydraulic oil in guide piston cavity;
(3) entering the hydraulic oil in guide piston cavity promotes long spool to move to left, and long spool promotes poppet valve core to make poppet valve core open with the sealing structure that pilot valve is formed, and poppet valve core compression damping spring simultaneously, the hydraulic oil in valve seat is through pilot valve chamber
Body enters the first oil duct by the second spout hole, and the hydraulic oil in the first oil duct is by entering fuel tank by oil return opening after flowing through the 3rd oil duct, cannelure and the 4th oil duct successively after check valve;
(4) after the hydraulic oil in valve seat is released, the oil pressure outside valve seat, more than the oil pressure in valve seat, produces pressure reduction inside and outside valve seat, and this pressure reduction promotes valve seat to move to right, and opens valve seat and the sealing structure of the second oil duct formation, makes the second oil duct and the 3rd oil duct communicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410777274.1A CN104454736B (en) | 2014-12-15 | 2014-12-15 | A kind of load holding valve and method of work thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410777274.1A CN104454736B (en) | 2014-12-15 | 2014-12-15 | A kind of load holding valve and method of work thereof |
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| Publication Number | Publication Date |
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| CN104454736A CN104454736A (en) | 2015-03-25 |
| CN104454736B true CN104454736B (en) | 2016-06-15 |
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| CN106949263B (en) * | 2017-05-18 | 2019-05-24 | 山河智能装备股份有限公司 | Load with variable area pilot ratio keeps one-way valve connection and control method |
| CN108980129B (en) * | 2018-07-24 | 2020-04-07 | 中国航空工业集团公司西安飞行自动控制研究所 | Load holding control valve |
| KR102100949B1 (en) * | 2019-01-25 | 2020-04-16 | 디와이파워 주식회사 | Holding valve device provided with multi-stage pressure actuated spool valve structure |
| CN110145508B (en) * | 2019-05-22 | 2024-03-22 | 新乡市德恩智能工业有限公司 | Multi-way valve with holding valve |
| CN111853111B (en) * | 2020-07-17 | 2021-09-03 | 中车青岛四方车辆研究所有限公司 | Brake cylinder |
| CN112879365B (en) * | 2021-01-19 | 2022-10-14 | 龙工（上海）精工液压有限公司 | Load holding valve for excavator |
| CN113898626B (en) * | 2021-08-31 | 2023-11-07 | 徐工集团工程机械股份有限公司 | Load holding device and load holding system |
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| CN201232784Y (en) * | 2008-07-17 | 2009-05-06 | 贵州枫阳液压有限责任公司 | Load holding valve |
| CN102644632A (en) * | 2012-05-13 | 2012-08-22 | 合肥长源液压股份有限公司 | Electro-hydraulic multiple-way directional valve |
| CN103148038A (en) * | 2013-03-20 | 2013-06-12 | 镇江华瑞液压机械有限公司 | Dual-energy saving combined hydraulic valve |
| CN203570734U (en) * | 2013-11-26 | 2014-04-30 | 中联重科股份有限公司渭南分公司 | Balance valve, hydraulic cylinder stretching control loop and hydraulic equipment |
| CN103742473A (en) * | 2013-12-31 | 2014-04-23 | 浙江大学 | Split type pilot load control valve |
| CN204371812U (en) * | 2014-12-15 | 2015-06-03 | 山东华伟液压设备制造有限公司 | A kind of load holding valve |
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| CN104454736A (en) | 2015-03-25 |
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Address after: Jinan town airport 250017 Licheng District in Shandong province Ji'nan City Road West Applicant after: SHANDONG HUAWEI HYDRAULIC TECHNOLOGY CO., LTD. Address before: Jinan town airport 250017 Licheng District in Shandong province Ji'nan City Road West Applicant before: SHANDONG HUAWEI HYDRAULIC EQUIPMENT MANUFACTURING CO., LTD. |
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Denomination of invention: Load holding valve and running method thereof Effective date of registration: 20190322 Granted publication date: 20160615 Pledgee: Qilu bank Limited by Share Ltd Ji'nan high tech branch Pledgor: SHANDONG HUAWEI HYDRAULIC TECHNOLOGY CO., LTD. Registration number: 2019370000053 |
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Date of cancellation: 20200311 Granted publication date: 20160615 Pledgee: Qilu bank Limited by Share Ltd Ji'nan high tech branch Pledgor: SHANDONG HUAWEI HYDRAULIC TECHNOLOGY Co.,Ltd. Registration number: 2019370000053 |
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Denomination of invention: Load holding valve and running method thereof Effective date of registration: 20200323 Granted publication date: 20160615 Pledgee: Jinan area branch of Shandong free trade zone of Qilu Bank Co., Ltd Pledgor: SHANDONG HUAWEI HYDRAULIC TECHNOLOGY Co.,Ltd. Registration number: Y2020370000030 |