EP3744984A1 - Oleodynamisches ventil - Google Patents

Oleodynamisches ventil Download PDF

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Publication number
EP3744984A1
EP3744984A1 EP20177257.1A EP20177257A EP3744984A1 EP 3744984 A1 EP3744984 A1 EP 3744984A1 EP 20177257 A EP20177257 A EP 20177257A EP 3744984 A1 EP3744984 A1 EP 3744984A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic circuit
spools
line
logic element
pressure
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.)
Granted
Application number
EP20177257.1A
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English (en)
French (fr)
Other versions
EP3744984B1 (de
Inventor
Davide MESTURINI
Ulderico Busani
Alessandro CERVI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Walvoil SpA
Original Assignee
Walvoil SpA
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Publication date
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Publication of EP3744984A1 publication Critical patent/EP3744984A1/de
Application granted granted Critical
Publication of EP3744984B1 publication Critical patent/EP3744984B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • 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
    • F15B11/167—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load using pilot pressure to sense the 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
    • F15B2211/20538—Type of pump constant 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
    • F15B2211/20—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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
    • F15B2211/31535—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and a single output member
    • 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31582—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and a single output member
    • 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
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
    • 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
    • F15B2211/41509—Flow control characterised by the connections of the flow 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
    • F15B2211/40—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
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • 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
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/635—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
    • 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
    • F15B2211/67—Methods for controlling pilot pressure
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/781—Control of multiple output members one or more output members having priority

Definitions

  • the present invention finds application in hydraulic valves and the object thereof is the realization of a hydraulic circuit suitable, for example, for lifting applications in the presence of valve distributors with multiple functions intended for working machines such as front loaders, shovels, buckets.
  • a common problem in applications with two (or more) uses on working machines such as front loaders, shovels, buckets, etc. .. is the management of the flow rate addressed simultaneously to two sections (boom and bucket).
  • the distribution of the same among the elements depends on the pressures generated by the loads on the uses and therefore potentially, in certain situations, the simultaneousness of the movements is not guaranteed.
  • This problem is more evident when one section controls a lower load downward movement and at the same time the other activated section controls a higher load upward movement. Since it can be complex even for an expert operator to distribute the flow rates directed to the activations with the adjustment spools and guarantee the contemporaneity of said movements, regulation devices equipped with local compensators for each section are known in the state of the art.
  • the technical problem underlying the present invention is that of providing a hydraulic circuit for a front loader which allows to improve the known solutions and can at least partially overcome one or more of the identifiable disadvantages in relation to the prior art.
  • a further object of the present invention is to provide a constructively simple solution for a hydraulic circuit equipped with flow rate management capacity addressed simultaneously to two uses in applications on working machines.
  • the circuit according to the present invention provides for the presence of a control device capable of being activated only in the case of specific combinations of movements, restricting the passage area towards the use (or the discharge thereof) at a lower load, while under other conditions of use where the distribution of the flow rates is less problematic or where the spools are activated individually, it does not intervene or its operation is irrelevant.
  • the same control spools are those that enable /disable the device, preferably by closing the passage of the pilot signal, when these are activated in the upward direction.
  • control device guarantees an overall operation with a priority activation in which no changes are introduced on each section of the valve system as part of a simple rational solution with a rather low cost.
  • control device is capable of reducing the passage area towards a use or the discharge of the same in order to distribute the input flow rate equally on two uses activated simultaneously.
  • the device can be used with various types of circuit supply, in particular both with open centre circuits supplied by fixed displacement pumps and with LS circuits.
  • the invention further provides for the application of a same device in two different areas of the circuit itself or different supply apparatus.
  • FIG. 2 a schematic diagram of a control device 1 used in a hydraulic circuit 100 for a working machine, for example a front loader, according to the present invention is illustrated in Figure 2 .
  • the control device 1 comprises a logic element 10 preferably composed of a 2-way 2-position logic element, for example composed of a 2-way 2-position drawer, maintained by a spring 2 under a resting condition, i.e. of free passage.
  • a pilot line Pil is also defined in the control device which line receives a decoupled pressure Pd, generated by a pressure reducing member 3 or by an outer supply line.
  • the pressure reducing element 3 is composed of a choke, preferably is located at a diversion line Ld as a diversion to the supply line LP or said outer supply line.
  • the pressure reducing element can comprise a pressure reducing valve 31 present inside the control device 1 itself or any device for limiting the flow and pressure on the line Pil.
  • the choke 3 is capable of reducing the passage area along the diversion line Ld, introducing a corresponding pressure loss, with a consequent pressure reduction.
  • the hydraulic circuit 100 comprises a plurality of spools C1, C2 ..., Cn connected to respective first uses A1, A2 ... An and second uses B1, B2 ... Bn which together form a control valve distributor 20.
  • the first uses A1, A2 are associated with the upward movement of the arm and bucket of the loader, while the second uses B1, B2 are associated with the downward movement of the same. It is however evident that the same concepts can also be applied to other activations of a working machine, configuring the first and second uses in such a way as to make the relative hydraulic actuator carry out an upward or downward movement, respectively.
  • control device 1 is connected to the spools in such a way that the pilot line Pil passes through all the spools C1, C2 ..., Cn of the control valve distributor 20 through respective hydraulic passages L1, L2, ... Ln up to the discharge T.
  • control device 1 and the valve distributor 20 can be made by means of a single component, inside which the lines and passages necessary for the realisation of the present invention are made, or, alternatively, the control device can be made as a stand-alone component, combinable with existing valve distributors.
  • a driving conduit 5 which carries the pilot signal provided by the line Pil to work in opposition to the spring 2 on the device 1 is present downstream said spools C1, C2 ..., Cn along the line Pil.
  • the hydraulic passage L1, L2, ... Ln is in a state of free passage. Under this condition, the pressure along the driving conduit 5 (except for pressure losses) is similar to that of discharge T and therefore the device remains under a resting condition of free passage.
  • the spools C1, C2 ..., Cn are configured in such a way that when at least one spool is moved to carry out the upward movement, the relative passage L1, L2, ... Ln is closed. Consequently, the line Pil is no longer connected to the discharge and reaches the pressure of the supply line LP or, if the choke 3 is replaced with or combined with a reducing valve 31, it reaches the set pressure of the reducing valve itself, as well as the pressure along the conduit 5. Since the pressure applied to the active area 5a of the device 1 is now greater than he equivalent pressure value exerted by the spring 2, the logic element switches to the active choked passage position.
  • the hydraulic circuit for front loader 100 of the example of Figure 3 is of the free circulation type and comprises a fixed displacement pump 6 in parallel configuration.
  • the supply line LP supplies the uses A1, A2 ... An when the spools are switched to carry out the upward movement.
  • a second supply line LP' is located as a diversion to the supply line LP, which passes through the device 1 and subsequently supplies the uses B1, B2 ... Bn when the spools are switched to carry out the downward movement.
  • Figure 4 describes an alternative embodiment of the present invention, in which the control device 1 is inserted inside a hydraulic circuit with a fixed displacement pump in a parallel configuration.
  • control device is inserted along the discharge line T' in which drains coming from the first uses A1, A2 ... An converge when the spools are switched to carry out the downward movement.
  • the line T is present downstream the line T' where all the drains coming from the first uses B1, B2 ... Bn converge when the spools are switched to carry out the upward movement connected in turn with the discharge.
  • Figure 5 illustrates a further embodiment variant in which the control device 1 is inserted inside a circuit LS with variable displacement pump 7. The operation of the circuit is similar to that described in the figure.
  • the solution LS also applies to the case of a logic element 10 located on the discharge line, shown in figure 4 .
  • Figure 6 describes a variant of the control device according to the present invention.
  • control device 1' operates in a normally closed rather than open manner, as in the previous embodiments.
  • the spring 2 of the logic element 10 is adapted to keep the logic element 10 in the choked passage position 11 when it is under a resting condition.
  • the diversion pressure Pd will therefore preferably be applied to an active area 5a of the logic element 10 that is stressed in the same direction as the spring 2.
  • the supply pressure P is also copied at a second active area 5b of the logic element 10 in such a way that the force exerted by the spring 2 and the diversion pressure is counteracted by the supply pressure P.
  • the invention therefore solves the proposed problem, at the same time achieving a plurality of advantages, allowing in particular to optimize the management of the flow rate in applications with two or more uses on working machines such as front loaders, shovels, buckets.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Control Of Transmission Device (AREA)
EP20177257.1A 2019-05-31 2020-05-28 Oleodynamisches ventil Active EP3744984B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000007737A IT201900007737A1 (it) 2019-05-31 2019-05-31 Valvola oleodinamica con movimento prioritario in azionamenti simultanei

Publications (2)

Publication Number Publication Date
EP3744984A1 true EP3744984A1 (de) 2020-12-02
EP3744984B1 EP3744984B1 (de) 2023-10-18

Family

ID=68072983

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20177257.1A Active EP3744984B1 (de) 2019-05-31 2020-05-28 Oleodynamisches ventil

Country Status (2)

Country Link
EP (1) EP3744984B1 (de)
IT (1) IT201900007737A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2022993A1 (de) * 1970-05-12 1971-12-02 Westinghouse Bremsen Und Appba Steuereinrichtung fuer Druckmittelsysteme
EP0393195A1 (de) 1988-06-17 1990-10-24 Kabushiki Kaisha Kobe Seiko Sho Fluid-steuerungsmechanismus für kraftschaufeln
EP0705984A2 (de) * 1994-09-30 1996-04-10 Samsung Heavy Industries Co., Ltd Variables Folgeventil
US20150059331A1 (en) * 2012-06-15 2015-03-05 Sumitomo(S.H.I.) Construction Machinery Co., Ltd. Hydraulic circuit for construction machine and control device therefor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2022993A1 (de) * 1970-05-12 1971-12-02 Westinghouse Bremsen Und Appba Steuereinrichtung fuer Druckmittelsysteme
EP0393195A1 (de) 1988-06-17 1990-10-24 Kabushiki Kaisha Kobe Seiko Sho Fluid-steuerungsmechanismus für kraftschaufeln
EP0705984A2 (de) * 1994-09-30 1996-04-10 Samsung Heavy Industries Co., Ltd Variables Folgeventil
US20150059331A1 (en) * 2012-06-15 2015-03-05 Sumitomo(S.H.I.) Construction Machinery Co., Ltd. Hydraulic circuit for construction machine and control device therefor

Also Published As

Publication number Publication date
EP3744984B1 (de) 2023-10-18
IT201900007737A1 (it) 2020-12-01

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