EP3390842B1 - Hydraulic valve device with multiple working sections with pump control system - Google Patents
Hydraulic valve device with multiple working sections with pump control system Download PDFInfo
- Publication number
- EP3390842B1 EP3390842B1 EP16823216.3A EP16823216A EP3390842B1 EP 3390842 B1 EP3390842 B1 EP 3390842B1 EP 16823216 A EP16823216 A EP 16823216A EP 3390842 B1 EP3390842 B1 EP 3390842B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- line
- flow rate
- load
- valve device
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 29
- 239000013642 negative control Substances 0.000 claims description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 description 11
- 230000007423 decrease Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/24—Bypassing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/02—Pumping installations or systems having reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
- F15B11/055—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive by adjusting the pump output or bypass
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/605—Load sensing circuits
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
Definitions
- the present invention relates to the field of hydraulic valve devices with open circuit and multiple working elements or sections designed to control a pump.
- variable displacement pump the hydraulic pressure taken upstream of an orifice placed at the end of the bypass line, also called carry-over, is sent to the pump regulator.
- control is such that, with decreasing pressure upstream of the orifice, the flow rate sent by the variable displacement pump increases. Therefore, it is said that it is a negative control circuit.
- these systems also provide that the pump still generates a minimum flow and the balance between flow rate and control pressure of the pump regulator is as in the accompanying figure 4 .
- the flow rate to the utility at a certain stroke of the relative spool depends on the load, if the load increases, the flow rate to the utility decreases and that through the orifice increases, with a consequent reduction of the flow rate sent, up to reach a new balance point in which the flow rate to the utility and that sent will have decreased while the flow rate through the orifice will have increased.
- bypass line is further narrowed resulting in a reduction of the flow rate through the bypass line itself and through choke 2, with consequent decrease of the control signal to the pump and increase of the flow rate from the delivery to the utilities.
- the flow rate is divided between the two utilities on the basis of the reciprocal loads and as these loads vary, the division among the driven utilities varies and so does the sum of the single flow rates.
- a first object of the present invention is to provide a valve device which allows eliminating some limits of the control system of a variable displacement, negative control or LS pump within a simple, rational and cost-effective solution.
- a first aspect of the invention is to provide a valve device comprising a pressure regulator on the bypass line adapted to keep the pressure drop constant only along the bypass line through the elements of the device.
- figure 1 shows an example of prior art, in particular a negative control variable displacement pump the displacement of which is determined by the control pressure N.
- the control pressure N is given by the flow rate load losses through the fixed choke 2.
- control negative pump a feature of the control negative pump is that the displacement (and thus the flow rate supplied) increases with decreasing control pressure PN and vice versa.
- control negative pump a feature of the control negative pump is that the displacement (and thus the flow rate supplied) increases with decreasing control pressure PN and vice versa.
- FIG 2 shows a circuit of the type comprising a variable displacement pump according to the present invention.
- variable displacement pump indicated with PA
- PA the type of variable displacement pump
- the delivery is connected in P1 to the entry side FE.
- One or more elements E1...En (in the case 2 elements E1 and E2) of the crossing type that allows connecting the PA pump and the tank to the various utilities through the uses (A1, B1, A2, B2).
- a bleeding side FS keeps the flow rates from the bypass line LC separate from those coming from the return of the utilities and from the bleeds of the valves and connects them both to tank T through two separate lines.
- valve device in figure 2 there is at least one delivery line P1 connected to the variable displacement pump for negative control systems PA, which feeds the side FE and the crossing elements E1 and E2, downstream at high pressure; it is noted that the number of elements varies depending on the number of utilities to connect.
- a bypass or crossing line is also provided, indicated with LC, connecting the delivery P1 to the tank: however, contrary to what happens in standard crossing valve distributors, where they all are connected so as to come out of a single fitting, in the present invention the bypass line, and thus the flow rate flowing into line LC is kept separate with respect to the lines of the return flow rates of utilities and valves, which equally go to tank T but with two separate fittings, that is:
- bypass line LC and the return of the utilities and the valve bleeds are connected to tank T.
- Valve 5 in this example is calibrated at 30 bar.
- This flow rate creates a certain load loss along the bypass line LC through the elements (E1, E2), thus generating a defined pressure just downstream of the regulator 5.
- the regulator 5 is calibrated just above such a pressure value.
- This system also provides that the pump still generates a minimum flow and the balance between flow rate and control pressure of the pump regulator is as in figure 4 .
- the displacement is determined by the control pressure N.
- the control pressure N is given by the flow rate load losses through the fixed choke 2.
- the inclusion of the regulator 5 imposes a constant pressure PC.
- the regulator 5 is in fact configured so as to keep the pressure constant at its calibration value, then it intervenes by reducing the flow rate (only in the bypass line LC) at that value, whereby the load losses are equal to the calibration of the regulator 5.
- the regulator 5 prevents this additional flow rate from flowing in the bypass line LC.
- Said additional flow rate only flows towards the actuated utility, i.e. through the load line 4 and to the utility.
- bypass line LC narrows further resulting, in the order:
- a fixed pressure of the bypass line LC before the first element and being the pressure in the tank fixed and considered null a fixed pressure drop is set by said regulator 5 between the beginning of the LC before the first section and the tank.
- regulator 5 only on the bypass line LC sets the pressure stage ⁇ P; in addition, the passage area through the bypass line LC is known and defined: the value of a given flow rate Q is thus obtained from the formula, which crosses all the line LC and orifice 2 (the latter placed on the same line, downstream).
- control signal N is taken after all the elements E1..En but before the fixed choke 2, it follows that the pressure at that point is given by the load losses of the determined flow rate Q through choke 2 (considering the pressure in tank T as null).
- said predetermined flow rate Q must be equal to the minimum one of pump PA.
- the circuit of the valve device shown is, as said, adapted to also control a load sensing pump.
- control feeds the control signal of the negative control pump and generates a flow rate inversely proportional to the control pressure (in turn inversely proportional to the stroke of the spools).
- said control signal N now closes a suitable choke, i.e. a proportional opening tray 7, a tray that is placed along the load line 4.
- FIG 5 it is illustrated another possible embodiment of the invention which comprises a load sensing pump PA; instead of the choke 7 is observed the presence of another choke 17 of a proportional opening drawer, in this case said choke 17 is located along the delivery line, upstream of the junction that separates LC and the load line 4; the connection line N now acts on the relative drawer so that:
- An LS signal downstream of said choke of tray 7, 17 arrives at the LS PA pump, so the latter sends a flow rate proportional to the opening of the choke, in turn inversely proportional to the control pressure which is in turn inversely proportional to the stroke of spools C1, C2, ...Cn.
- control signal is configured for opening in a manner inversely proportional the choke of the tray 7, 17 while a signal (LS) from the load line 4, downstream said choke, arrives to the pump.
- the valve device has a regulator valve 5 only on the bypass line LC and upstream of the first element E1.
- the valve device makes the flow rate to the utility independent of the load and allows setting a maximum flow rate at the end of the stroke; in multiple drives, it ensures that the sum of the required flow rates is independent of the loads.
- the regulator 5 is configured so as to impose a constant pressure drop along the single bypass line LC and through the elements E1, En.
- the bypass line LC is configured to be connected to tank T through a fitting C, independent of the fitting into which the return flow rates of utilities and valves flow.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUB2015A009570A ITUB20159570A1 (it) | 2015-12-16 | 2015-12-16 | Dispositivo valvolare idraulico a piu' sezioni di lavoro con sistema di controllo della pompa |
PCT/EP2016/081392 WO2017103079A1 (en) | 2015-12-16 | 2016-12-16 | Hydraulic valve device with multiple working sections with pump control system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3390842A1 EP3390842A1 (en) | 2018-10-24 |
EP3390842B1 true EP3390842B1 (en) | 2022-09-21 |
Family
ID=55642742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16823216.3A Active EP3390842B1 (en) | 2015-12-16 | 2016-12-16 | Hydraulic valve device with multiple working sections with pump control system |
Country Status (4)
Country | Link |
---|---|
US (1) | US20180372088A1 (it) |
EP (1) | EP3390842B1 (it) |
IT (1) | ITUB20159570A1 (it) |
WO (1) | WO2017103079A1 (it) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUB20159571A1 (it) * | 2015-12-18 | 2017-06-18 | Walvoil Spa | Dispositivo valvolare idraulico a piu' sezioni di lavoro con sistema di controllo della pompa con linea di by-pass |
JP7314404B2 (ja) * | 2020-03-30 | 2023-07-25 | 日立建機株式会社 | 作業機械 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140318116A1 (en) * | 2011-12-08 | 2014-10-30 | Kawasak Jukogyo Kabushiki Kaisha | Hydraulic control device and construction machinery including same |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57197336A (en) * | 1981-05-29 | 1982-12-03 | Komatsu Ltd | Oil-pressure circuit for turning excavator |
DE3532816A1 (de) * | 1985-09-13 | 1987-03-26 | Rexroth Mannesmann Gmbh | Steueranordnung fuer mindestens zwei von mindestens einer pumpe gespeiste hydraulische verbraucher |
JPH03229001A (ja) * | 1990-02-01 | 1991-10-11 | Kayaba Ind Co Ltd | 流体圧アクチュエータの駆動回路 |
DE4027047A1 (de) * | 1990-08-27 | 1992-03-05 | Rexroth Mannesmann Gmbh | Ventilanordnung zur lastunabhaengigen steuerung mehrerer hydraulischer verbraucher |
US6244158B1 (en) * | 1998-01-06 | 2001-06-12 | Fps, Inc. | Open center hydraulic system with reduced interaction between branches |
CN1274810A (zh) * | 1999-05-21 | 2000-11-29 | 株式会社岛津制作所 | 多阀门装置 |
KR101597174B1 (ko) * | 2008-03-31 | 2016-02-24 | 나부테스코 가부시키가이샤 | 건설기계의 유압회로 |
KR20110076073A (ko) * | 2009-12-29 | 2011-07-06 | 볼보 컨스트럭션 이큅먼트 에이비 | 네가티브 컨트롤방식 유압시스템 |
US9175456B2 (en) * | 2010-06-22 | 2015-11-03 | Hitachi Construction Machinery Co., Ltd. | Hydraulic control device for working vehicle |
JP2012141037A (ja) * | 2011-01-05 | 2012-07-26 | Hitachi Constr Mach Co Ltd | 建設機械の油圧アクチュエータ駆動回路 |
-
2015
- 2015-12-16 IT ITUB2015A009570A patent/ITUB20159570A1/it unknown
- 2015-12-16 US US16/063,249 patent/US20180372088A1/en not_active Abandoned
-
2016
- 2016-12-16 EP EP16823216.3A patent/EP3390842B1/en active Active
- 2016-12-16 WO PCT/EP2016/081392 patent/WO2017103079A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140318116A1 (en) * | 2011-12-08 | 2014-10-30 | Kawasak Jukogyo Kabushiki Kaisha | Hydraulic control device and construction machinery including same |
Also Published As
Publication number | Publication date |
---|---|
US20180372088A1 (en) | 2018-12-27 |
WO2017103079A1 (en) | 2017-06-22 |
ITUB20159570A1 (it) | 2017-06-16 |
EP3390842A1 (en) | 2018-10-24 |
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