EP2101061A1 - Système hydromécanique - Google Patents

Système hydromécanique Download PDF

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Publication number
EP2101061A1
EP2101061A1 EP09003428A EP09003428A EP2101061A1 EP 2101061 A1 EP2101061 A1 EP 2101061A1 EP 09003428 A EP09003428 A EP 09003428A EP 09003428 A EP09003428 A EP 09003428A EP 2101061 A1 EP2101061 A1 EP 2101061A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
hydromechanical
flameproof enclosure
hydromechanical system
flame
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
EP09003428A
Other languages
German (de)
English (en)
Other versions
EP2101061B1 (fr
Inventor
Norbert Eufinger
Norbert Otte
Rudolf Rietzler
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.)
Hoerbiger Automatisierungstechnik Holding GmbH
Original Assignee
Hoerbiger Automatisierungstechnik Holding GmbH
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Hoerbiger Automatisierungstechnik Holding GmbH filed Critical Hoerbiger Automatisierungstechnik Holding GmbH
Publication of EP2101061A1 publication Critical patent/EP2101061A1/fr
Application granted granted Critical
Publication of EP2101061B1 publication Critical patent/EP2101061B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18—Combined units comprising both motor and pump
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type

Definitions

  • the present invention relates to a hydromechanical system, comprising an electric drive motor, a hydraulic pump driven by the latter, and a hydraulic unit comprising a tank and a hydromechanical converter, in particular in the immediate vicinity of the hydraulic unit, which is fluidically connected to the hydraulic unit via hydraulic lines.
  • Hydromechanical systems of the type specified above are known in various embodiments and embodiments. They are particularly useful in applications where high energy densities are desired or needed; because the existing in the design of the individual components of the hydromechanical system flexibility makes it possible, if necessary, to configure corresponding hydromechanical systems so that the hydromechanical transducer provides high forces even with relatively compact overall dimensions of the system.
  • hydromechanical systems of the generic type although they require in typical applications as well as electromechanical systems only an electrical supply line from the outside, the latter are considerably superior.
  • Another advantage of the generic hydromechanical systems is the ability to make them particularly reliable and / or fail-safe; because hydraulic energy can be stored loss-free with little effort, so that even in case of failure of the hydraulic unit (motor-pump unit) an emergency operation by applying the hydromechanical transducer from the relevant hydraulic accumulator out is possible. Also the possibility of lossless storage of hydraulic energy in a suitable memory (eg hydraulic accumulator, spring accumulator, gas spring, etc.) also contributes to the fact that the hydraulic unit can be dimensioned correspondingly small, especially in those applications in which the hydromechanical transducer, measured on the for the loading of the memory by means of the hydraulic unit available time, is operated only comparatively short.
  • a suitable memory eg hydraulic accumulator, spring accumulator, gas spring, etc.
  • the present invention aims to provide a generic hydromechanical system, which can be used without restriction to comparable, no explosion protection hydromechanical systems due to a particularly reliable structural explosion protection in rooms where there is an increased risk of explosion, in particular, other practical aspects are taken into account, for example by the cost of manufacture, operation and maintenance of the corresponding explosion-proof hydromechanical system should not be overly expensive compared to non-explosion-proof hydromechanical systems of the same power.
  • hydromechanical systems according to the invention are distinguished by the fact that the hydraulic power unit - and only this, not the hydromechanical fluid acted upon by it Converter - is housed in a flameproof enclosure, ie in such an encapsulation, which withstand the design occurring in an explosion of an accumulated inside the flameproof enclosure flammable gas pressure.
  • the present invention is directed to the consequences of a - quite to be considered - explosion in Minimize the immediate environment of the hydraulic unit, ie exclude harmful effects on the outside of the flameproof enclosure lying area.
  • the present invention makes use of the ignition protection "flameproof enclosure" according to the ATEX Directive 94/9 / EP.
  • the hydromechanical system according to the invention is not suggested by the knownness of this type of protection as such.
  • the present invention accepts the undesirable, counterproductive effect of a (in some cases massive) pressure drop of the hydraulic fluid flowing through the hydraulic lines in the area of the flame arresters in order to ensure the flameproof enclosure alone of the hydraulic unit (and, if appropriate, further potential sources of ignition of the components) hydromechanical system, see below), ie without enabling the hydro-mechanical converter, in particular in order to minimize the space enclosed by the flameproof enclosure.
  • the present invention thus builds on the recognition that the subordination of flow-dynamic aspects which determine the efficiency of the hydromechanical system, ie the deliberate acceptance of a loss of hydraulic efficiency of the system, enables a particularly practicable execution of the explosion protection. For there are a number of practical advantages that can be achieved thereby of the hydromechanical system according to the invention, which distinguish it in a special way.
  • a first corresponding advantage is economic. Because the hydromechanical system according to the invention can be produced inexpensively, and also additional operating costs for the achievable explosion protection are not incurred. In that regard, in an explosion-proof hydromechanical system according to the invention things are in particular much cheaper as in the case of EP 1515041 A1 , according to which for the installation of a blower for the protective gas, corresponding pipelines and a pressure control, a significant system-related overhead arise and also there is a corresponding footprint. Also omitted in the invention required in the known explosion-proof hydromechanical system for the operation of the blower for the protective gas electrical power.
  • the hydromechanical system according to the invention is more reliable than that according to the EP 1515041 A1 ; because it requires no fan for the protective gas, which can potentially fail, with the result of a corresponding failure of the explosion protection.
  • the hydromechanical system according to the present invention can be realized with particular advantage where the supply (and optionally the removal) of an ignition protection gas is particularly costly and / or not economically feasible, ie in particular in decentralized applications where a large number of hydromechanical systems are distributed over an extensive plant.
  • the present invention of the recent - at least partially, in some areas of technology - existing tendency contrary to supply several hydromechanical transducers not, as in the past rather common to use a central hydraulic unit, but rather decentralized, consumer close or directly to the hydromechanical transducer (Hydraulic cylinder or the like.) Arranged hydraulic units.
  • Typical applications of the present invention are hydraulically actuated so far Flow through a flow line regulating valves in a variety of applications.
  • a first preferred embodiment of the invention is characterized in that the flame arresters are arranged in the hydraulic lines substantially flush with the wall of the flameproof enclosure in the region of the respective passage of the respective hydraulic line.
  • Such an arrangement of the flame arresters is particularly favorable in view of the achievable explosion protection.
  • the flame arresters can be arranged in a suitable construction directly in a corresponding hole, in particular a stepped bore in the wall of the flameproof enclosure.
  • Particularly favorable is a disc-shaped design of the flame arrester, especially in the form of known as such wound tape backups.
  • the respective tape restraints are particularly preferably frontally on both sides edged by support grid discs.
  • the respective support grid discs prevent damage to the tape backups due to the prevailing significant pressure drop in the regular operation of the hydromechanical system through the hydraulic fluid flowing therethrough.
  • Another preferred embodiment of the invention is characterized in that the hydraulic unit fills the volume of the flameproof enclosure at least 65%. Since in this development, in other words, a maximum of 35% of the volume of flameproof enclosure may contain an explosive gases, can be in typical applications of decentralized hydraulic units (power range less than about 1200 W electrical, more preferably less than about 900 W electric) at an explosion of a gas accumulated inside the pressure-resistant enclosure occurring pressures reliably dominate even with relatively small wall thicknesses.
  • a reservoir for hydraulic fluid is arranged outside of the pressure-resistant enclosure, which is fluidically connected to the - arranged within the flameproof enclosure - tank of the hydraulic unit via a flameproof enclosure passing hydraulic line, in which a flame arrester is inserted ,
  • the tank of the hydraulic unit can be made comparatively small (in particular with a capacity of less than one liter, preferably of about 0.7 l), which in turn has a favorable effect on the dimensions of the flameproof enclosure and thus on the required wall thickness.
  • An electric level sensor is only provided on the inside of the pressure-resistant enclosure arranged tank, not meanwhile arranged on the outside of the flameproof enclosure reservoir to avoid a potential ignition source outside the flameproof enclosure.
  • a hydraulic pressure accumulator is provided outside the flameproof enclosure, which is fluidically connected to the pressure side of the hydraulic pump via a hydraulic line passing through the flameproof enclosure into which a flame arrester is inserted.
  • the hydromechanical system according to the invention has electrically or electromechanically actuated valves, in particular in order to control the application of the hydro-mechanical converter, at least the electrical or electromechanical components of the relevant valves are arranged within the flameproof enclosure according to yet another preferred development of the present invention. Also contemplated is an arrangement of the respective valves in total, ie including the mechanical components, within the flameproof enclosure.
  • a particularly preferred development of the invention is characterized in that in a valve in a flow line with a flow-through housing and a flow control element adjustably mounted therein, on which a arranged on the housing hydraulic Actuator acts on the housing further an electric drive motor, a hydraulic pump driven by this and a tank comprehensive hydraulic unit is arranged, which is fluidically connected to the hydraulic adjustment via hydraulic lines, further wherein the hydraulic unit is completely surrounded by a flameproof enclosure and in the the flameproof enclosure penetrating hydraulic lines flame arresters are used.
  • Particular features of such a fitting can be deduced from the above-mentioned developments of the hydromechanical system according to the invention.
  • the contour of the shut-off plate 5 is on matched to the inner diameter of the housing to allow in the - on the plane of the drawing perpendicular locking position a tight closure of the flow line.
  • hydraulic adjusting 6 is provided to adjust the shut-off plate 5 is arranged on the housing 1 hydraulic adjusting 6 is provided.
  • This is designed as a hydromechanical transducer 7 by having a piston unit with two flanges 9 end-mounted on a piston rod 10, sealingly guided in associated cylinders 8, within a cylinder housing 47 flanged to the housing 1.
  • the two pistons 9 are double-acting, by delimiting in the respective associated cylinder 8 two hydraulic fluid acted upon by hydraulic fluid.
  • a double-acting design of the Hydromechanical transducer 7 comes if necessary (eg in fail-safe valves) and a simple design into consideration, in which case the piston can work, for example against a spring accumulator.
  • the guided in corresponding holes 48 of the cylinder housing 47 - piston rod 10 is executed in a central portion in the form of a rack 11 which meshes with a connected to the shaft 12 of the shut-off plate 5 gear 13.
  • the valve further comprises a decentralized, solely the actuation of the flow control element 3 of the relevant valve by appropriate application the hydraulic adjusting drive 6 serving hydraulic unit 14, which comprises an electric drive motor 15, a driven by this hydraulic pump 16 and a tank 17.
  • the valve shown comprises a - known as such - directional control valve 19, which is connected in the hydraulic unit 14 with the hydraulic adjustment 6 hydraulically connecting hydraulic lines 18 and by means of an electric linear drive 20 in the form of an attached to the valve housing 27 electromagnet in known as such Way in different positions is switchable. If the hydraulic unit is designed for reversing operation, in the simplest case, a directional control valve 19 having two switch positions is sufficient.
  • the hydraulic unit 14 and the directional control valve 19 together with the valve housing 27 and the linear drive 20 are completely surrounded by a flameproof enclosure 21.
  • This comprises a via an intermediate plate 51, which forms a line block, attached to the cylinder housing 47 base plate 49 and a screwed with this hood 50.
  • the hydraulic unit 18 hydraulically connecting the hydraulic unit 14 with the hydraulic adjustment 6 hydraulic lines 18 are guided through the intermediate plate 51.
  • the hydraulic lines 18 each penetrate in their area between the directional control valve 19 and the working spaces of the two cylinders 8 of the hydraulic adjusting drive 6, the wall 22 of the pressure-resistant enclosure 21. In these sections of the hydraulic lines Flame barriers used 23, flush with the wall 22 in question.
  • FIG Fig. 3 A preferred way of carrying out the flame arrestors 23 and installing or accommodating them in the respective hydraulic lines 18 is in FIG Fig. 3 illustrated.
  • the flame arresters 23 are disc-shaped, in the form of (wound) tape fences 24.
  • the front side of each tape backup 24 is enclosed on both sides by perforated support grid discs 25.
  • the package of band securing 24 and associated support grid discs 25 is in each case inserted into a stepped bore 26 of the wall 22 of the base plate 49 of the flameproof enclosure 21. It is held by the intermediate plate 51, which is flanged to the larger diameter portion 28 of the stepped bore 26, in abutment against the shoulder 29 of the stepped bore 26.
  • the valve housing 27 is flanged to the smaller diameter portion 31 of the stepped bore 26.
  • the stepped bore is in each case between the flange surface and the opposite surrounding end face of the wall 22 of the flameproof enclosure 21, a suitable annular seal 32 is provided.
  • a pressure-resistant or intrinsically safe terminal box 33 is arranged outside of one of the walls 22 of the base plate 49 of the flameproof enclosure 21, a pressure-resistant or intrinsically safe terminal box 33 is arranged. He takes the control 34 for the valve.
  • the necessary supply lines 35 and 36 for the electric drive motor 15 of the hydraulic unit 14 and the linear drive 20 are guided by a known as such explosion-proof cable bushing 37 into the interior of the flameproof enclosure 21.
  • signal and / or control lines in particular the signal line of a arranged on the tank 17 level sensor 38 and the signal line of the pressure on the pressure side of the hydraulic pump 16 detecting, attached to the valve housing pressure sensor 40.
  • signal or Control lines may, for example, relate to an actual value sensor for the position of the liner drive 20 or to an oil thermometer measuring the temperature of the hydraulic fluid.
  • the signal line of the position of the shut-off plate 5 detecting actual value can be moved outside the flameproof enclosure 21.
  • a reservoir 41 is provided, from which the tank 17 can be fed with hydraulic fluid.
  • the reservoir 41 with the tank 17 via a hydraulic line 42 which is passed through the intermediate plate 51 and the flameproof enclosure 21 passes through fluidly connected.
  • this hydraulic line 42 is in the above in detail described manner substantially flush with the wall 22 of the base plate 49 of the flameproof enclosure 21, a flame arrester 43 is inserted.
  • a hydraulic pressure accumulator 44 is arranged outside the pressure-resistant enclosure 21 outside the pressure-resistant enclosure 21 outside the pressure-resistant enclosure 21.
  • This is fluidically connected to the pressure side of the hydraulic pump 16 via a hydraulic line 45, which is passed through the intermediate plate 51, which is passed through the intermediate plate 51 and the pressure-resistant enclosure 21 passes through.
  • a flame arrester 46 is inserted in this hydraulic line 45 in the manner described above in detail substantially flush with the wall 22 of the base plate 49 of the flameproof enclosure 21, a flame arrester 46 is inserted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP20090003428 2008-03-15 2009-03-10 Système hydromécanique Active EP2101061B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008014539A DE102008014539A1 (de) 2008-03-15 2008-03-15 Hydromechanisches System

Publications (2)

Publication Number Publication Date
EP2101061A1 true EP2101061A1 (fr) 2009-09-16
EP2101061B1 EP2101061B1 (fr) 2013-09-18

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EP (1) EP2101061B1 (fr)
DE (1) DE102008014539A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007137A1 (de) 2010-02-05 2011-08-11 Hoerbiger Automatisierungstechnik Holding GmbH, 86956 Fluidbetätigter Stellantrieb an einer Armatur
WO2011095351A1 (fr) 2010-02-05 2011-08-11 Hoerbiger Automatisierungstechnik Holding Gmbh Servomoteur actionné par un fluide dans une robinetterie
DE102013007927A1 (de) 2013-05-10 2014-11-13 Hoerbiger Automatisierungstechnik Holding Gmbh Antriebseinheit
WO2016210397A1 (fr) * 2015-06-25 2016-12-29 Tescom Corporation Contrôleur électronique certifié pour les gaz non inertes
WO2020141265A1 (fr) * 2019-01-04 2020-07-09 4Mc Bloc de puissance pour l'actionnement d'un obturateur de vanne
WO2022148668A1 (fr) * 2021-01-08 2022-07-14 Robert Bosch Gmbh Unité de transmission hydraulique, en particulier pour une utilisation en haute mer
US11448243B2 (en) * 2017-04-19 2022-09-20 Robert Bosch Gmbh Electrohydraulic system for use under water, comprising an electrohydraulic actuator
US11448242B2 (en) 2018-10-08 2022-09-20 Robert Bosch Gmbh Hydraulic system for use under water with a hydraulic actuating drive

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11852152B2 (en) 2019-10-07 2023-12-26 The Gorman-Rupp Company Pin vent assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29815151U1 (de) 1998-08-24 1998-10-29 ASF THOMAS Industries GmbH, 82178 Puchheim Flammensperre für Flüssigkeits- und/oder Gasleitungen
DE10152510B4 (de) 2001-10-18 2004-09-23 Bartec Sicherheits-Schaltanlagen Gmbh Schutzgehäuse für elektrische Betriebsmittel
EP1515041A1 (fr) 2003-09-09 2005-03-16 Bosch Rexroth AG Groupe hydraulique avec un réservoir pour liquide hydraulique et une unité motopompe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29815151U1 (de) 1998-08-24 1998-10-29 ASF THOMAS Industries GmbH, 82178 Puchheim Flammensperre für Flüssigkeits- und/oder Gasleitungen
DE10152510B4 (de) 2001-10-18 2004-09-23 Bartec Sicherheits-Schaltanlagen Gmbh Schutzgehäuse für elektrische Betriebsmittel
EP1515041A1 (fr) 2003-09-09 2005-03-16 Bosch Rexroth AG Groupe hydraulique avec un réservoir pour liquide hydraulique et une unité motopompe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"RICHTLINIE 94/9/EG", 23 March 1994, DAS EUROPÄISCHE PARLAMENT UND DER RAT DER EUROPÄISCHEN UNION, XP002533726 *

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8973890B2 (en) * 2010-02-05 2015-03-10 Hoerbiger Automatisierungstechnik Holding Gmbh Fluid-operated actuating drive on a valve
DE102010007152B4 (de) 2010-02-05 2017-03-30 Hoerbiger Automatisierungstechnik Holding Gmbh Fluidbetätigter Stellantrieb an einer Armatur
DE102010007137A1 (de) 2010-02-05 2011-08-11 Hoerbiger Automatisierungstechnik Holding GmbH, 86956 Fluidbetätigter Stellantrieb an einer Armatur
DE102010007152A1 (de) 2010-02-05 2011-08-11 Hoerbiger Automatisierungstechnik Holding GmbH, 86956 Fluidbetätigter Stellantrieb an einer Armatur
CN102822536A (zh) * 2010-02-05 2012-12-12 贺尔碧格自动化技术控股股份有限公司 在阀门上的流体操纵的伺服驱动装置
CN102834617A (zh) * 2010-02-05 2012-12-19 贺尔碧格自动化技术控股股份有限公司 在配件上流体操纵的伺服驱动装置
US20130009080A1 (en) * 2010-02-05 2013-01-10 Hoerbiger Automatisierungstechnik Holding Gmbh Fluid-operated actuating drive on a valve
US8752806B2 (en) 2010-02-05 2014-06-17 Hoerbiger Automatisierungstechnik Holding Gmbh Fluid-operated actuating drive on a valve
CN102822536B (zh) * 2010-02-05 2015-04-22 贺尔碧格自动化技术控股股份有限公司 在阀门上的流体操纵的伺服驱动装置
RU2551468C2 (ru) * 2010-02-05 2015-05-27 ХЁРБИГЕР Аутоматизирунгстехник Холдинг ГмбХ Сервопривод трубопроводной арматуры, приводимый в действие текучей средой
WO2011095350A1 (fr) 2010-02-05 2011-08-11 Hoerbiger Automatisierungstechnik Holding Gmbh Servomoteur actionné par un fluide dans une robinetterie
WO2011095351A1 (fr) 2010-02-05 2011-08-11 Hoerbiger Automatisierungstechnik Holding Gmbh Servomoteur actionné par un fluide dans une robinetterie
CN102834617B (zh) * 2010-02-05 2016-03-02 贺尔碧格自动化技术控股股份有限公司 在配件上流体操纵的伺服驱动装置
DE102013007927B4 (de) * 2013-05-10 2014-12-24 Hoerbiger Automatisierungstechnik Holding Gmbh Antriebseinheit
US9807892B2 (en) 2013-05-10 2017-10-31 Hoerbiger Automatisierungstechnik Holding Gmbh Drive unit
DE102013007927A1 (de) 2013-05-10 2014-11-13 Hoerbiger Automatisierungstechnik Holding Gmbh Antriebseinheit
WO2016210397A1 (fr) * 2015-06-25 2016-12-29 Tescom Corporation Contrôleur électronique certifié pour les gaz non inertes
US20160377192A1 (en) * 2015-06-25 2016-12-29 Tescom Corporation Non-inert gas certified electronic controller
US10197181B2 (en) 2015-06-25 2019-02-05 Tescom Corporation Non-inert gas certified electronic controller
US11448243B2 (en) * 2017-04-19 2022-09-20 Robert Bosch Gmbh Electrohydraulic system for use under water, comprising an electrohydraulic actuator
US11448242B2 (en) 2018-10-08 2022-09-20 Robert Bosch Gmbh Hydraulic system for use under water with a hydraulic actuating drive
WO2020141265A1 (fr) * 2019-01-04 2020-07-09 4Mc Bloc de puissance pour l'actionnement d'un obturateur de vanne
WO2022148668A1 (fr) * 2021-01-08 2022-07-14 Robert Bosch Gmbh Unité de transmission hydraulique, en particulier pour une utilisation en haute mer

Also Published As

Publication number Publication date
EP2101061B1 (fr) 2013-09-18
DE102008014539A1 (de) 2009-09-17

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