EP2435713B1 - Procédé destiné à enlever des impuretés d'un régulateur numérique de pression hydraulique d'un système hydraulique - Google Patents

Procédé destiné à enlever des impuretés d'un régulateur numérique de pression hydraulique d'un système hydraulique Download PDF

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Publication number
EP2435713B1
EP2435713B1 EP10713637.6A EP10713637A EP2435713B1 EP 2435713 B1 EP2435713 B1 EP 2435713B1 EP 10713637 A EP10713637 A EP 10713637A EP 2435713 B1 EP2435713 B1 EP 2435713B1
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EP
European Patent Office
Prior art keywords
pressure regulator
valve
line
valve means
section
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.)
Not-in-force
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EP10713637.6A
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German (de)
English (en)
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EP2435713A1 (fr
Inventor
Ville Hopponen
Arto Ikonen
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Valmet Technologies Oy
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Valmet Technologies Oy
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Publication of EP2435713A1 publication Critical patent/EP2435713A1/fr
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Publication of EP2435713B1 publication Critical patent/EP2435713B1/fr
Not-in-force legal-status Critical Current
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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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • 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"
    • F15B11/0426—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" by controlling the number of pumps or parallel valves switched on
    • 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
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
    • 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
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40592—Assemblies of multiple valves with multiple valves in parallel flow paths

Definitions

  • the invention relates to a method for removing foreign matter from a digital hydraulic pressure regulator of a hydraulic system and more particularly to a method for removing foreign matter from a digital hydraulic pressure regulator of a hydraulic system of a machine for producing a fibrous web, in particular a paper or board machine.
  • actuators are hydraulically driven, with which large forces can be set and exercised with high accuracy.
  • a working fluid e.g. Hydraulic oil used
  • a pump which pressurizes the working fluid
  • a hydraulic actuator e.g. a hydraulic cylinder or hydraulic motor
  • a proportional control valve or proportional valve which may be electrically, hydraulically, or pneumatically driven.
  • Such a control valve has a slidable or displaceable spool or spool which, in response to its location in an associated valve housing, can adjust a desired pressure at the outlet by controlling the pressure of hydraulic oil delivered by the pump.
  • the mobility of the spool in the valve body absolutely requires a certain clearance or gap between the control piston and the valve housing, so that an internal leakage of the control valve is unavoidable.
  • the gap size must not be too narrow, otherwise the valve would be too susceptible to contamination in the hydraulic oil.
  • a digital hydraulic pressure regulator consists of a series of valves connected in parallel, which have only ON / OFF functions; So are simple ON / OFF switching valves that allow or interrupt a flow and can be consistently referred to in this application as valves.
  • the valves are all connected to a common supply line on the one hand and to a common output line on the other hand.
  • the valves themselves may be conventional solenoid valves, i. Be valves with electromagnetic drive. Of course, other forms of drive can be chosen.
  • valves By connecting or installing throttle elements or by the valves themselves, it is ensured that the valves have different flow cross-sections and thus different flows when they are open; a throttle element together with a valve forms a valve device.
  • a throttle element together with a valve forms a valve device.
  • the flow rates Q in the individual, each of the associated valve selectively releasable flow cross-sections in the ratio of 1: 2: 4: 8 to each other; for a larger number of valves this series will continue accordingly.
  • valves are either open or closed, i. To maintain a desired pressure in a closed (and unchanged) system, the valves are simply closed and there are no internal leakage flows. This is a clear difference to the conventional proportional valve, which is always traversed by a hydraulic oil flow. This constantly costs energy for the hydraulic pumps, e.g. in the paper machine.
  • a method for removing foreign substances from a digital hydraulic pressure regulator of a hydraulic system, in particular for a machine for producing a fibrous web is proposed.
  • the pressure regulator has two pressure regulator sections, which can be connected to one another, for example, by an overflow valve and each of which has two valve banks.
  • a plurality of individually switchable valve means is provided, each having a different flow cross-section.
  • the valve means of each valve bank have stepwise mutually different flow cross-sections, ie, a flow cross-section of a valve means of a valve bank with respect to a flow cross section of another valve means the same valve bank to a predetermined amount larger or smaller.
  • valve means are connected in parallel within a valve bank so as to form a parallel arrangement within a valve bank.
  • a valve bank of each pressure regulator section may connect a supply line for supplying the digital hydraulic pressure regulator with a pressurized working fluid, such as hydraulic oil and the like, with a regulator output line.
  • the other valve bank of the same pressure regulator section can connect the regulator outlet line with a drain line for discharging the working fluid from the pressure regulator.
  • the method according to the invention has a step of connecting the two pressure regulator sections, a step of opening the valve device with the largest flow cross section of the supply line side valve bank of a pressure regulator section, a step of opening the valve device with the largest flow cross section of the drain line side valve bank of the other pressure regulator section and a step of Rinse the open flow path through the pressure regulator with the working fluid, while the remaining valve means are closed.
  • the longest possible flow path is opened and rinsed by the pressure regulator with the largest possible flow cross-section, in order thereby to provide, among other things. To be able to flush out as much foreign bodies as possible from the pressure regulator.
  • the method according to the invention furthermore has a step of opening the valve device with the next-smaller flow cross section of the valve Supply line side valve bank of a pressure regulator section, a step of opening the valve means with the next smaller flow cross section of the drain line side valve bank of the other pressure regulator section and a step of purging the open flow path through the pressure regulator with the working fluid, while the remaining valve means are closed.
  • the method described so far may also include a step of opening the valve device with the largest flow cross section of the supply line side valve bank of the other pressure regulator section, a step of opening the valve device with the largest flow cross section of the drain line side valve bank of a pressure regulator section and a step of purging the opened flow path through the pressure regulator with the working fluid while the remaining valve means are closed.
  • the method may further include a step of opening the valve means with the next smaller flow cross section of the supply line side valve bank of the other pressure regulator section, a step of opening the Valve means having the next smaller flow cross section of the drain line side valve bank of a pressure regulator section and a step of purging the open flow path through the pressure regulator with the working fluid, while the remaining valve means are closed.
  • the pressurized working fluid according to the inventive method is preferably stored in a pressure accumulator prior to rinsing. It is further preferable that the working fluid is pressurized by a pump.
  • the method according to the invention preferably further comprises a step of collecting the working fluid after the step of purging in a tank for storing pressureless working fluid.
  • Fig. 1 shows a portion of a hydraulic system with a pressure accumulator 11, a digital hydraulic pressure regulator 4 and a hydraulic differential cylinder 3 in a schematic diagram.
  • One Supply section 1 with a pump pressure accumulator 11, a pump 16 and a tank 20 supplies the pressure regulator 4 with a pressurized working fluid.
  • the pressure regulator 4 has two pressure regulator sections 41, 42 for operating a differential cylinder 3.
  • Sensors 19 detect by means of output lines 413, 423 the pressure in the two pressure chambers 31 and 34 of the differential cylinder 3, which are separated by a piston 33 with a piston rod 36.
  • the pressure in the rod-side pressure chamber 31 acts on the rod-side piston surface 32, while the pressure in the piston-side pressure chamber 34 presses on the piston surface 35.
  • each pressure regulator section 41, 42 is connected to a supply line 43, to a respective output line 413, 423, and to a respective drain line 414, 424. Furthermore, each pressure regulator section 41, 42 has a supply line side valve bank 411, 421 and a drain line side valve bank 412, 422. In this case, depending on whether valves of the banks are open or closed, the supply-side valve bank 411, 421 connect the supply line 43 with the respective output line 413, 423. Similarly, the drain line side valve bank 412, 422 may connect the respective output line 413, 423 to the respective drain line 414, 424.
  • the pressure in the pressure supply 1, from which the cylinder 3 is to be controlled, is measured by means of pressure sensor 14 and, based thereon, the target pressure in the pressure chambers 31 and 34 is set.
  • At 45 is one Overflow valve referred to, which allows a connection of the two pressure chambers 31 and 34 optionally.
  • the function of this spill valve 45 which can be switched to passage, separates the regulator sections 41, 42 and the pressure chambers 31, 34 from each other in the closed state. When the spill valve 45 opens, the two pressure chambers are connected or shorted together. As a rule, there is a load or force on the piston rod which tends to push the piston rod into the cylinder.
  • the overflow valve 45 is opened and the control valves of the piston rod side controller section remain closed.
  • the working fluid thus flows partly into the piston-side pressure chamber 31 and partly into the tank (not shown).
  • the outflow into the tank is controlled by the cylinder-side regulator section 42 and thus controls the lowering speed of the piston rod.
  • Fig. 2 shows a flow path opened by the method according to the invention, in which the pressurized working fluid from the pump 16 via the supply line 43 through the valve with the largest flow cross-section, in this example with a flow cross-sectional diameter of 1.5 mm, the supply line side valve bank 421 of the pressure regulator section 42nd is conveyed to the output line 423. Since the output line 423 of the pressure regulator section 42 communicates via the opened spill valve 45 with the outlet line 413 of the pressure regulator section 41, the working fluid becomes the output line 413 and further through the valve having the largest flow area, in this example a Flow cross-sectional diameter of 1.5 mm, the drain line side valve bank 412 of the pressure regulator section 41 conveyed into the tank 20 and collected there. In this procedure, a flushing of the longest flow path is achieved with the largest possible flow cross-section of the pressure regulator 4, wherein in the flushed parts of the pressure regulator 4 existing foreign matter flushed out and thus removed from the pressure regulator 4.
  • a circuit of the pressure regulator 4 for venting a first part of the pressure regulator 4 is in Fig. 3 shown.
  • Fig. 3 A circuit of the pressure regulator 4 for venting a first part of the pressure regulator 4 is in Fig. 3 shown.
  • the valve with the next smaller flow area in the supply line side valve bank 421 of the pressure regulator section 42 and the valve with the next smaller flow area of the drain line side valve bank 412 of the pressure regulator section 41 are opened.
  • the working fluid is purged through the flow path formed thereby.
  • the valve with the next smaller flow cross section is located in the valve arrangement shown in each of the valve banks next to the previously opened valve with the largest possible flow cross-section.
  • valve with the next smallest flow cross-section in each of the active valve banks is opened and the flow path opened thereby purged, etc. These steps are repeated until all the valves of the two in Fig. 3 shown active valve banks are flushed and vented.
  • FIG. 4 A circuit of the pressure regulator 4 for venting the remaining part of the pressure regulator 4 is in Fig. 4 shown. Analogous to Fig. 3 First, the longest flow path with the largest possible flow cross-section of the pressure regulator 4 is purged by the pressurized working fluid from the pump 16 via the supply line 43 through the valve with the largest flow cross section of the supply line side valve bank 422 of the pressure regulator section 41 is conveyed into the output line 413. Since the exit passage 413 of the pressure regulator section 41 communicates with the exit passage 423 of the pressure regulator section 42 via the opened relief valve 45, the working fluid becomes the exit passage 423 and further through the valve having the largest flow area of the drain passage side valve bank 422 of the pressure regulator section 42 into the tank 20 promoted and collected there.
  • valve with the next smaller flow area in the supply line side valve bank 411 of the pressure regulator section 41 and the valve with the next smaller flow area of the drain line side valve bank 422 of the pressure regulator section 42 are opened. Then, the working fluid is purged through the flow path formed thereby.
  • the valve with the next smaller flow cross section is located in the valve arrangement shown in each of the valve banks next to the previously opened valve with the largest possible flow cross-section.
  • the valve with the next smallest flow cross-section in each of the active valve banks is opened and the flow path opened thereby purged, etc. These steps are repeated until all valves of the pressure regulator 4 are flushed and vented.
  • valves of a valve bank with a descending flow cross section it is not absolutely necessary for the valves of a valve bank with a descending flow cross section to be arranged next to one another. It would also be conceivable to provide an arbitrary arrangement of the valves in each valve bank.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Fluid Pressure (AREA)

Claims (10)

  1. Procédé permettant d'éliminer des impuretés d'une conduite d'un système hydraulique, en particulier pour une machine destinée à la fabrication d'une bande de matière fibreuse,
    un régulateur numérique de pression hydraulique (4) présentant deux parties (41, 42), lesquelles peuvent être reliées entre elles, et chacune d'entre elles comportant deux blocs de vannes (411, 412, 421, 422) et une pluralité d'ensembles vannes (5) à commutation individuelle étant présentes dans chacune d'entre elles, ces ensembles vanne présentant respectivement une section d'écoulement différente et étant raccordées en parallèle à l'intérieur d'un bloc de vannes, l'un des blocs de vanne (411, 421) pouvant relier une conduite d'alimentation (43) à une conduite de sortie de régulateur (413, 423) et l'autre bloc de vannes (412, 422) pouvant relier la conduite de sortie de régulateur (413, 423) à une conduite d'évacuation (414, 424), et
    le procédé comprenant les étapes suivantes :
    la liaison des deux parties (41, 42) du régulateur de pression,
    l'ouverture de l'ensemble vanne présentant la plus grande section d'écoulement dans le bloc de vannes (421) côté conduite d'alimentation d'une des parties (42) du régulateur de pression,
    l'ouverture de l'ensemble vanne présentant la plus grande section d'écoulement dans le bloc de vannes (412) côté conduite d'évacuation de l'autre partie (41) du régulateur de pression, et
    la purge de la voie d'écoulement ouverte au moyen du régulateur de pression (4) et d'un fluide de travail sous pression, les ensembles vannes restants étant fermés.
  2. Procédé selon la revendication 1, le procédé comprenant en outre les étapes suivantes :
    l'ouverture de l'ensemble vanne présentant la section d'écoulement immédiatement inférieure dans le bloc de vannes (421) côté conduite d'alimentation d'une des parties (42) du régulateur de pression,
    l'ouverture de l'ensemble vanne présentant la section d'écoulement immédiatement inférieure dans le bloc de vannes (412) côté conduite d'évacuation de l'autre partie (41) du régulateur de pression, et
    la purge de la voie d'écoulement ouverte au moyen du régulateur de pression (4) et du fluide de travail, les ensembles vannes restants étant fermés.
  3. Procédé selon la revendication 2, les étapes mentionnées dans la revendication 2 étant répétées jusqu'à ce que tous les ensembles vanne (5) du bloc de vannes (421) côté conduite d'alimentation d'une des parties (42) du régulateur de pression et tous les ensembles vanne dans le bloc de vannes (412) côté conduite d'évacuation de l'autre partie (41) du régulateur de pression soient purgés.
  4. Procédé selon la revendication 2 ou 3, le procédé comprenant en outre les étapes suivantes :
    l'ouverture de l'ensemble vanne présentant la plus grande section d'écoulement dans le bloc de vannes (411) côté conduite d'alimentation de l'autre partie (41) du régulateur de pression,
    l'ouverture de l'ensemble vanne présentant la plus grande section d'écoulement dans le bloc de vannes (422) côté conduite d'évacuation d'une des parties (42) du régulateur de pression, et
    la purge de la voie d'écoulement ouverte au moyen du régulateur de pression (4) et du fluide de travail, les ensembles vannes restants étant fermés.
  5. Procédé selon la revendication 4, le procédé comprenant en outre les étapes suivantes :
    l'ouverture de l'ensemble vanne présentant la section d'écoulement immédiatement inférieure dans le bloc de vannes (411) côté conduite d'alimentation de l'autre partie (41) du régulateur de pression,
    l'ouverture de l'ensemble vanne présentant la section d'écoulement immédiatement inférieure dans le bloc de vannes (422) côté conduite d'évacuation de l'une des parties (42) du régulateur de pression, et
    la purge de la voie d'écoulement ouverte au moyen du régulateur de pression (4) et du fluide de travail, les ensembles vannes restants étant fermés.
  6. Procédé selon la revendication 5, les étapes mentionnées dans la revendication 5 étant répétées jusqu'à ce que tous les ensembles vanne du bloc de vannes (411) côté conduite d'alimentation de l'autre partie (41) du régulateur de pression et tous les ensembles vanne dans le bloc de vannes (422) côté conduite d'évacuation d'une des parties (42) du régulateur de pression soient purgés.
  7. Procédé selon l'une quelconque des revendications précédentes, les ensembles vanne (5) de chaque bloc de vannes présentant des sections d'écoulement se différenciant graduellement les unes des autres.
  8. Procédé selon l'une quelconque des revendications précédentes, le fluide de travail étant stocké dans un accumulateur hydraulique (11) avant la purge.
  9. Procédé selon l'une quelconque des revendications précédentes, le fluide de travail étant sollicité en pression par une pompe (16).
  10. Procédé selon l'une quelconque des revendications précédentes, le procédé comprenant en outre l'étape suivante :
    la collecte du fluide de travail, après l'étape de la purge, dans un réservoir (20) destiné à l'accumulation du fluide de travail exempt de pression.
EP10713637.6A 2009-05-29 2010-04-13 Procédé destiné à enlever des impuretés d'un régulateur numérique de pression hydraulique d'un système hydraulique Not-in-force EP2435713B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009026608A DE102009026608A1 (de) 2009-05-29 2009-05-29 Verfahren zum Entfernen von Fremdstoffen aus einem digitalhydraulischen Druckregler eines Hydrauliksystems
PCT/EP2010/054793 WO2010136253A1 (fr) 2009-05-29 2010-04-13 Procédé destiné à enlever des impuretés d'un régulateur numérique de pression hydraulique d'un système hydraulique

Publications (2)

Publication Number Publication Date
EP2435713A1 EP2435713A1 (fr) 2012-04-04
EP2435713B1 true EP2435713B1 (fr) 2015-03-04

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EP10713637.6A Not-in-force EP2435713B1 (fr) 2009-05-29 2010-04-13 Procédé destiné à enlever des impuretés d'un régulateur numérique de pression hydraulique d'un système hydraulique

Country Status (5)

Country Link
US (1) US8920575B2 (fr)
EP (1) EP2435713B1 (fr)
CN (1) CN102449318B (fr)
DE (1) DE102009026608A1 (fr)
WO (1) WO2010136253A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102009026608A1 (de) 2009-05-29 2010-12-02 Metso Paper, Inc. Verfahren zum Entfernen von Fremdstoffen aus einem digitalhydraulischen Druckregler eines Hydrauliksystems
EP2543890B1 (fr) * 2011-07-04 2018-09-05 Valmet Technologies, Inc. Composant de sécurité
DK201270573A (en) * 2012-02-01 2013-08-02 Hydratech Ind Wind Power As Hydraulic system primarily for pitch control
DE102013224390A1 (de) 2013-11-28 2015-05-28 Robert Bosch Gmbh Ventilanordnung für ein Digitalhydrauliksystem
DE102013224337A1 (de) 2013-11-28 2015-05-28 Robert Bosch Gmbh Ventilanordnung für ein Digitalhydrauliksystem
DE102015221259A1 (de) * 2015-10-30 2017-05-04 Festo Ag & Co. Kg Ventilmodul und Ventilanordnung
DE102016206821A1 (de) * 2016-04-21 2017-10-26 Festo Ag & Co. Kg Verfahren zum Betreiben einer Ventileinrichtung, Ventileinrichtung und Datenträger mit einem Computerprogramm
US11067102B1 (en) * 2020-04-13 2021-07-20 Mac Valves, Inc. Digital proportional pressure controller
EP4174324A1 (fr) * 2021-10-29 2023-05-03 Danfoss Scotland Limited Contrôleur et procédé pour appareil hydraulique

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DE19724447A1 (de) * 1997-06-10 1998-12-17 Buerkert Werke Gmbh & Co Verfahren zum Herstellen eines digitalen Proportionalventils und Proportionalventil
FI118608B (fi) * 2001-04-23 2008-01-15 Matti Linjama Ohjausjärjestelmä ja menetelmä toimilaitteen ohjaamiseksi ja ohjauksen optimoimiseksi rinnankytkettyjen venttiilisarjojen avulla
US6467264B1 (en) * 2001-05-02 2002-10-22 Husco International, Inc. Hydraulic circuit with a return line metering valve and method of operation
FI113794B (fi) * 2002-11-14 2004-06-15 Metso Paper Inc Menetelmä ja järjestely pitkänomaisen telavälineen paikan ja/tai voiman säätämiseksi
DE102004006683A1 (de) * 2004-02-11 2005-09-01 Zf Friedrichshafen Ag Schalteinheit
FI123590B (fi) * 2005-09-06 2013-07-31 Bosch Gmbh Robert Venttiilijärjestelmän vikojen havaitseminen ja vikasietoinen ohjaus
DE102006012008A1 (de) * 2006-03-14 2007-09-20 Robert Bosch Gmbh Steuervorrichtung zur Rotorblattverstellung
DE102007032964A1 (de) * 2007-07-16 2009-01-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Vorrichtung zum Stellen eines Aktuators
DE102009026608A1 (de) 2009-05-29 2010-12-02 Metso Paper, Inc. Verfahren zum Entfernen von Fremdstoffen aus einem digitalhydraulischen Druckregler eines Hydrauliksystems

Also Published As

Publication number Publication date
CN102449318A (zh) 2012-05-09
DE102009026608A1 (de) 2010-12-02
US20120067378A1 (en) 2012-03-22
WO2010136253A1 (fr) 2010-12-02
CN102449318B (zh) 2014-10-29
US8920575B2 (en) 2014-12-30
EP2435713A1 (fr) 2012-04-04

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