CN104454736A - Load holding valve and running method thereof - Google Patents
Load holding valve and running method thereof Download PDFInfo
- Publication number
- CN104454736A CN104454736A CN201410777274.1A CN201410777274A CN104454736A CN 104454736 A CN104454736 A CN 104454736A CN 201410777274 A CN201410777274 A CN 201410777274A CN 104454736 A CN104454736 A CN 104454736A
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- valve
- oil
- oil duct
- spool
- valve seat
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000013016 damping Methods 0.000 claims abstract description 30
- 239000003921 oil Substances 0.000 claims description 153
- 239000010720 hydraulic oil Substances 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 21
- 210000000683 abdominal cavity Anatomy 0.000 claims description 19
- 239000000945 filler Substances 0.000 claims description 16
- 238000012856 packing Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 6
- 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
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 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
- 230000001681 protective effect 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 invention relates to a load holding valve and a running method thereof. The load holding valve comprises a valve body, a valve seat, a damping spool, a tapered spool, a long spool, a pilot spool and a pilot piston; the valve seat, the damping spool, the tapered spool, the long spool, the pilot spool and the pilot piston are disposed within the valve body. The valve seat, the pilot spool and the pilot piston are connected in order. The damping spool is disposed within the valve seat. The long spool is disposed within the pilot spool. The taper spool at the front end of the long spool is disposed within the damping spool. The valve body is provided with a first oil passage, a second oil passage, a third oil passage, a fourth oil passage, a working oil hole, an oil inlet Pi and a return hole. According to the load holding valve, structural modifications are made based on the traditional oil valve, descent speed of a hydraulic cylinder is controlled to a lowest limit by controlling natural descent of the hydraulic cylinder, caused by valve leakage, the problem of excess settlement of a moving arm is effectively avoided, and descent of the moving arm is better controlled. The load holding valve is ingenious in design, simple in structure, evidently functional and significantly effective.
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 technique
In existing excavator technology, swing arm connection controls swing arm settling amount by the sealing in valve body and internal leakage, when meta got back to by swing arm operating handle, the sealing of swing arm connection and internal leakage can control swing arm and naturally fall, swing arm is made to be remained on original position, but the control of internal leakage is compared and is difficult to realize more steady control, and swing arm settling amount can be caused unavoidably excessive.This do not have second protective measures 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 comprises the main valve that valve body, piston, submissile spring abutment, little spring, little moveable door, spool, spring seat and spring are formed, the precursor overflow valve be made up of overflow valve body, overflow spring and the Outflow Valve with oilhole, the guide's throttle valve be made up of the one-way throttle valve be arranged in throttling valve pocket and throttling spring, and the one-way relief valves be made up of the big spring seat be arranged in work oil duct, big spring, large valve and valve plug.This valve is arranged on operating cylinder and need not be connected with operating cylinder by oil pipe, mainly eliminates entrap phenomenon and eliminates the accident potential that oil pipe burst causes.But it is excessive that this valve does not solve swing arm settling amount, control the problem of swing arm sedimentation.
Therefore, need a kind of control valve declined for swing arm of design badly, the interior leakage of valve body is controlled, to reach the object controlling swing arm and decline.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of load holding valve.
The present invention also provides a kind of method of work of above-mentioned load holding valve.
Technological scheme of the present invention is as follows:
A kind of load holding valve, comprise valve body and be arranged on the main valve plug in valve body, described valve body comprises abdominal cavity, in described abdominal cavity, set gradually valve seat, pilot valve and guide piston from left to right;
Described valve body is provided with actuator port, Pi filler opening, return opening, the first oil duct, the second oil duct, the 3rd oil duct and the 4th oil duct;
Described valve seat coordinates with the second oil duct and forms sealing configuration, stops the hydraulic oil in the second oil duct to enter the 3rd oil duct, when valve seat moves to right, opens sealing configuration, make the hydraulic oil in the second oil duct enter the 3rd oil duct; Described valve seat is provided with the first overflow hole, described first overflow hole communicates with the second oil duct; Described pilot valve is provided with the second overflow hole, described second overflow hole communicates with the first oil duct; Described guide piston is provided with the 3rd overflow hole, 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 overflow hole;
The center line of described pilot valve runs through and is provided with 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 coordinates with pilot valve and forms sealing configuration and stop the high pressure oil in valve seat to enter in pilot valve, when poppet valve core moves to left, the high pressure oil in valve seat is entered and enters in the first oil duct by the second overflow hole in pilot valve;
Described main valve plug is provided with circular groove, when main valve plug moves to right, is communicated with the 3rd oil duct and the 4th oil duct by circular groove.
Preferably, damping spool is provided with in described valve seat, the left end of described damping spool arranges oil inlet hole, the right-hand member of described damping spool arranges damping spring, described poppet valve core is provided with packing ring, be positioned at orifice valve core inner after damping spring is run through in the front end of described poppet valve core, described packing ring is connected with damping spring.
Preferably, described pilot valve is also provided with drain pan, described drain pan communicates with the first oil duct, and described second overflow hole is positioned at drain pan.
Preferably, the profile of described guide piston is arranged in stepped shaft cylindrical body.
Preferably, described valve body also comprises one-way valve, described one-way valve is arranged in the first oil duct.Advantage of this design is, one-way valve plays the effect that one-way flow oppositely ends, and its objective is and flow to the 3rd oil duct in order to make from the second overflow hole hydraulic oil flowed in the first oil duct, prevent the hydraulic oil in the first oil duct from oppositely flowing back to.
Preferably, described valve body also comprises the first plug screw, and described first plug screw is arranged at the right side of guide piston in order to shutoff abdominal cavity.
Preferably, described valve body also comprises the second plug screw, and described second plug screw is arranged on one-way valve side.The advantage of this design is, increases the convenient maintenance of the second plug screw of design or changes one-way valve.
Preferably, described valve body also comprises pilot valve chamber, and described pilot valve chamber is connected with described abdominal cavity.The advantage of this design is, is discharged by hydraulic oil unnecessary in abdominal cavity, prevent useless hydraulic oil in abdominal cavity inner accumulated by pilot valve chamber.
Preferably, between described guide piston and pilot valve, guide's spring is provided with.
A method of work for load holding valve, comprises the steps,
(1) when main valve plug left end leads to guide oil, guide oil promotes main valve plug and moves to right, and now circular groove is communicated with the 3rd oil duct and the 4th oil duct, and a part of guide oil enters Pi filler opening simultaneously;
(2) guide oil entering Pi filler opening promotes the resistance that guide piston overcomes guide's spring and is moved to the left, and guide oil is entered in guide piston cavity by the 3rd overflow hole and forms hydraulic oil;
(3) hydraulic oil entered in guide piston cavity promotes long spool and moves to left, the sealing configuration that long spool promotion poppet valve core makes poppet valve core and pilot valve be formed is opened, poppet valve core compression damping spring simultaneously, high pressure oil in valve seat enters the first oil duct through pilot valve cavity by the second overflow hole, and the high pressure oil in the first oil duct enters fuel tank by return opening after flowing through the 3rd oil duct, circular groove and the 4th oil duct after one-way valve successively;
(4) after the high pressure oil in valve seat is released, oil pressure outside valve seat is greater than the oil pressure in valve seat, inside and outside valve seat, produce pressure reduction, and this pressure reduction promotes valve seat and moves to right, open the sealing configuration that valve seat and the second oil duct are formed, the second oil duct and the 3rd oil duct are communicated.
Beneficial effect of the present invention is:
Load holding valve of the present invention, the basis of traditional fuel tap is carried out finish structure improve, leaked the nature of the oil hydraulic cylinder caused by control valve under, its rate of descent of general who has surrendered controls in lowest limit, effectively can avoid the problem that swing arm settling amount is excessive, achieves swing arm decline and controls preferably.Load holding valve design concept of the present invention is ingenious, and structure is simple, and effect is obvious, Be very effective.
Accompanying drawing explanation
Fig. 1 be in load holding valve of the present invention second oil duct and the 3rd oil duct completely cut off before sectional structure schematic diagram;
Fig. 2 be in load holding valve of the present invention second oil duct communicate with the 3rd oil duct after sectional structure schematic diagram;
Fig. 3 is load holding valve working 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, one-way 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 overflow hole, 20, 3rd oil duct, 21, 4th oil duct, 22, circular groove, 23, Pi filler opening, 24, second overflow hole, 25, cavity, 26, 3rd overflow hole, 27, actuator port, 28, return opening.
Embodiment
Below by embodiment, also the present invention will be further described by reference to the accompanying drawings, but be not limited thereto.
Embodiment 1:
A kind of load holding valve provided by the invention, the main valve plug 14 comprising valve body 1 and be arranged in valve body, valve body comprises abdominal cavity, sets gradually valve seat 8, pilot valve 3 and guide piston 2 in described abdominal cavity from left to right;
Valve body 1 is provided with actuator port 27, Pi filler opening 23, return opening 28, first oil duct 15, second oil duct 16, the 3rd oil duct 20 and the 4th oil duct 21;
Abdominal cavity is all connected with the 3rd oil duct 20 with the second oil duct 16, the left end of valve seat 8 matches to be formed with the inwall of the second oil duct 16 and bores sealing configuration, 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 configuration, make the hydraulic oil in the second oil duct 16 enter the 3rd oil duct 20; Valve seat 8 is provided with the first overflow hole 19, first overflow hole 19 to communicate with the second oil duct 16, ensure that the hydraulic oil in the second oil duct 16 enters into valve seat 8 inside by the first overflow hole 19, the hydraulic oil before being released in valve seat 8 carries out pressurize; Pilot valve 3 is provided with the second overflow hole 24, second overflow hole 24 to communicate with the first oil duct 15, ensures that the high pressure oil entering into pilot valve 3 inside can enter in the first oil duct 15 by the second overflow hole 24; Guide piston 2 is provided with the 3rd overflow hole 26, 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 overflow hole 26; When before the illogical guide oil of Pi filler opening 23, the right-hand member of guide piston 2 and valve interior wall are closely adjacent, when Pi filler opening 23 passes into guide's hydraulic fluid port, guide oil promotes guide piston 2 and is moved to the left, and now guide oil to be entered in cavity 25 by the 3rd overflow hole 26 and acts on long spool 5.
Pilot valve 3 center line has the through hole that runs through pilot valve, long spool 5 to be arranged in through hole and to form 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 the left end opening of shutoff through hole to be made poppet valve core 6 coordinate with pilot valve 3 to form sealing configuration to stop the high pressure oil in valve seat 8 to enter in pilot valve 3, when poppet valve core 6 moves to left, poppet valve core 6 is not at the left end opening of shutoff through hole, now sealing configuration is opened, high pressure oil in valve seat 8 is entered to be entered in the first oil duct by the second overflow hole 24 in pilot valve 3,
Wherein, main valve plug is provided with circular groove 22, when main valve plug 14 moves to right, is communicated with the 3rd oil duct 20 and the 4th oil duct 21 by circular groove 22.
The profile of guide piston 2 arranges in stepped shaft cylindrical body, the cylindrical diameter in both sides is identical and be less than the diameter of mediate cylindrical, the right side of guide piston is closely adjacent with the inwall of valve body, the guide oil now flowing into Pi filler opening 23 can contact with the cylindrical outer surface in right side, the shoulder place promotion guide piston 2 being acted on mediate cylindrical by guide oil is moved to the left, now guide piston and valve interior wall form gap, and guide oil just enters in cavity by the 3rd overflow hole 26.
Valve body 1 also comprises one-way valve 4, and one-way valve 4 is arranged in the first oil duct 15.One-way valve 4 plays the effect that one-way flow oppositely ends, and its objective is to flow to the 3rd oil duct in order to make from the second overflow hole 24 hydraulic oil flowed in the first oil duct, prevents the hydraulic oil in the first oil duct from oppositely flowing back to.
Valve body 1 also comprises the first plug screw 11 and the second plug screw 12, first plug screw 11 is arranged at the right side of guide piston 2 in order to shutoff abdominal cavity.Second plug screw 12 is arranged on one-way 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 one-way valve or cleaning the first oil duct.
Valve body also comprises pilot valve chamber 17, pilot valve chamber 17 is connected with described abdominal cavity, pilot valve chamber 17 is arranged between Pi filler opening 23 and the second plug screw 12, by pilot valve chamber, hydraulic oil unnecessary in abdominal cavity is discharged, prevent useless hydraulic oil in abdominal cavity inner accumulated.
In addition, install between described guide piston 2 and pilot valve 3 and guide's spring 10 is set, guide piston 2 and pilot valve 3 do not contact to be left guide's spring 10 for and does elastic space and guide piston 2 does mobile space, connected 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 filler opening, 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 as described in Example 1, its difference is, damping spool 7 is provided with in valve seat 8, the left end of damping spool 7 arranges oil inlet hole, and the right-hand member of damping spool 7 arranges damping spring 9, poppet valve core 6 is provided with packing ring 13, be positioned at damping spool 7 after damping spring 9 is run through in the front end of poppet valve core inner, packing ring 13 is connected with damping spring 9.When long spool 5 promote poppet valve core 6 be moved to the left time, packing ring 13 promotes damping spring 9 and compresses, and the sealing configuration that simultaneously poppet valve core 6 and pilot valve 3 are formed is opened, and the high pressure oil now in valve seat 8 enters pilot valve inside.When the obstructed guide oil of Pi filler opening, poppet valve core moves right by the elastic restoring force of damping spring, and poppet valve core gets back to the sealing configuration that original position keeps poppet valve core and pilot valve.
Embodiment 3:
A kind of load holding valve provided by the invention, as described in Example 1, its difference is structure, and pilot valve is also provided with drain pan 18, and drain pan 18 communicates with the first oil duct 15, and the second overflow 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 larger flux when communicating with the first oil duct comparatively greatly, facilitates and all enters into the first oil duct from overflow hole hydraulic oil out; Two is that drain pan can gather a part of hydraulic oil of storage, reduces unnecessary hydraulic oil in abdominal cavity and flows out from pilot valve chamber.
Embodiment 4:
A method of work for load holding valve, comprises the steps,
(1) when main valve plug 14 left end leads to guide oil, guide oil promotes main valve plug 14 and moves to right, and now circular groove 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 filler opening 23 simultaneously;
(2) guide oil being transported to Pi filler opening 23 promotes the resistance that guide piston 2 overcomes guide's spring 10 and is moved to the left, and guide oil is entered in guide piston 2 cavity by the 3rd overflow hole 26 and forms hydraulic oil;
(3) hydraulic oil entered in guide piston 2 cavity promotes long spool 5 and moves to left, long spool 5 promotes the sealing configuration that poppet valve core 6 makes poppet valve core 6 and pilot valve 3 be formed and opens, poppet valve core 6 compression damping spring 9 simultaneously, high pressure oil in valve seat 8 through pilot valve 3 inside to be entered by the second overflow hole 24 high pressure oil in first oil duct 15, first oil duct 15 by one-way valve 4 after flow through the 3rd oil duct 20, circular groove 22 and the 4th oil duct 21 successively after enter fuel tank by return opening 28;
(4) after the high pressure oil in valve seat 8 is released, oil pressure outside valve seat 8 is greater 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 and moves to right, open the sealing configuration that valve seat 8 and the second oil duct 16 are formed, the second oil duct 16 and the 3rd oil duct 20 are communicated.
Pass through the method, a whole set of mechanism be made up of valve seat, pilot valve, guide piston, long spool, poppet valve core is increased in valve body, to be coordinated with the second oil duct inwall by valve seat and form sealing configuration, the hydraulic oil controlled in the second oil duct enters 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 remain on original position well.
Claims (10)
1. a load holding valve, comprise valve body and be arranged on the main valve plug in valve body, it is characterized in that, described valve body comprises abdominal cavity, in described abdominal cavity, set gradually valve seat, pilot valve and guide piston from left to right;
Described valve body is provided with actuator port, Pi filler opening, return opening, the first oil duct, the second oil duct, the 3rd oil duct and the 4th oil duct;
Described valve seat coordinates with the second oil duct and forms sealing configuration, stops the hydraulic oil in the second oil duct to enter the 3rd oil duct, when valve seat moves to right, opens sealing configuration, make the hydraulic oil in the second oil duct enter the 3rd oil duct; Described valve seat is provided with the first overflow hole, described first overflow hole communicates with the second oil duct; Described pilot valve is provided with the second overflow hole, described second overflow hole communicates with the first oil duct; Described guide piston is provided with the 3rd overflow hole, 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 overflow hole;
The center line of described pilot valve runs through and is provided with 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 coordinates with pilot valve and forms sealing configuration and stop the high pressure oil in valve seat to enter in pilot valve, when poppet valve core moves to left, the high pressure oil in valve seat is entered and enters in the first oil duct by the second overflow hole in pilot valve;
Described main valve plug is provided with circular groove, when main valve plug moves to right, is communicated with the 3rd oil duct and the 4th oil duct by circular groove.
2. load holding valve as claimed in claim 1, it is characterized in that, damping spool is provided with in described valve seat, the left end of described damping spool arranges oil inlet hole, the right-hand member of described damping spool arranges damping spring, described poppet valve core is provided with packing ring, and be positioned at orifice valve core inner after damping spring is run through in the front end of described poppet valve core, described packing ring is connected with damping spring.
3. load holding valve as claimed in claim 1 or 2, it is characterized in that, described pilot valve is also provided with drain pan, and described drain pan communicates with the first oil duct, and described second overflow hole is positioned at drain pan.
4. load holding valve as claimed in claim 1 or 2, is characterized in that, the profile of described guide piston is arranged in stepped shaft cylindrical body.
5. load holding valve as claimed in claim 1 or 2, it is characterized in that, described valve body also comprises one-way valve, and described one-way valve is arranged in the first oil duct.
6. load holding valve as claimed in claim 1 or 2, it is characterized in that, described valve body also comprises the first plug screw, and described first plug screw is arranged at the right side of guide piston in order to shutoff abdominal cavity.
7. load holding valve as claimed in claim 5, it is characterized in that, described valve body also comprises the second plug screw, and described second plug screw is arranged on one-way valve side.
8. load holding valve as claimed in claim 1, it is characterized in that, described valve body also comprises pilot valve chamber, and described pilot valve chamber is connected with described abdominal cavity.
9. load holding valve as claimed in claim 1, is characterized in that, be provided with guide's spring between described guide piston and pilot valve.
10. a method of work for the load holding valve as described in any one of claim 1 to 9, comprises the steps,
(1) when main valve plug left end leads to guide oil, guide oil promotes main valve plug and moves to right, and now circular groove is communicated with the 3rd oil duct and the 4th oil duct, and a part of guide oil enters Pi filler opening simultaneously;
(2) guide oil entering Pi filler opening promotes the resistance that guide piston overcomes guide's spring and is moved to the left, and guide oil is entered in guide piston cavity by the 3rd overflow hole and forms hydraulic oil;
(3) hydraulic oil entered in guide piston cavity promotes long spool and moves to left, the sealing configuration that long spool promotion poppet valve core makes poppet valve core and pilot valve be formed is opened, poppet valve core compression damping spring simultaneously, high pressure oil in valve seat enters the first oil duct through pilot valve cavity by the second overflow hole, and the high pressure oil in the first oil duct enters fuel tank by return opening after flowing through the 3rd oil duct, circular groove and the 4th oil duct after one-way valve successively;
(4) after the high pressure oil in valve seat is released, oil pressure outside valve seat is greater than the oil pressure in valve seat, inside and outside valve seat, produce pressure reduction, and this pressure reduction promotes valve seat and moves to right, open the sealing configuration that valve seat and the second oil duct are formed, the second oil duct and the 3rd oil duct are communicated.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
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| CN104454736A true CN104454736A (en) | 2015-03-25 |
| CN104454736B CN104454736B (en) | 2016-06-15 |
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| CN201410777274.1A Active CN104454736B (en) | 2014-12-15 | 2014-12-15 | A kind of load holding valve and method of work thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949263A (en) * | 2017-05-18 | 2017-07-14 | 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 |
| CN108980129A (en) * | 2018-07-24 | 2018-12-11 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of load holding control valve |
| CN110145508A (en) * | 2019-05-22 | 2019-08-20 | 新乡市德恩智能工业有限公司 | A kind of multi-way valve equipped with holding valve |
| CN110230618A (en) * | 2019-06-25 | 2019-09-13 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic control two way selected valve, load keep module and load holding system |
| KR102100949B1 (en) * | 2019-01-25 | 2020-04-16 | 디와이파워 주식회사 | Holding valve device provided with multi-stage pressure actuated spool valve structure |
| CN111853111A (en) * | 2020-07-17 | 2020-10-30 | 中车青岛四方车辆研究所有限公司 | Brake cylinder |
| CN112879365A (en) * | 2021-01-19 | 2021-06-01 | 龙工（上海）精工液压有限公司 | Load holding valve for excavator |
| CN113898626A (en) * | 2021-08-31 | 2022-01-07 | 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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