EP0230529B1 - Valve arrangement for hydraulic accumulator - Google Patents

Valve arrangement for hydraulic accumulator Download PDF

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Publication number
EP0230529B1
EP0230529B1 EP86114822A EP86114822A EP0230529B1 EP 0230529 B1 EP0230529 B1 EP 0230529B1 EP 86114822 A EP86114822 A EP 86114822A EP 86114822 A EP86114822 A EP 86114822A EP 0230529 B1 EP0230529 B1 EP 0230529B1
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EP
European Patent Office
Prior art keywords
valve
pressure
control
line
shut
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.)
Expired - Lifetime
Application number
EP86114822A
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German (de)
French (fr)
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EP0230529A2 (en
EP0230529A3 (en
Inventor
Gerald Lexen
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MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge AG
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Publication date
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Priority to AT86114822T priority Critical patent/ATE72693T1/en
Publication of EP0230529A2 publication Critical patent/EP0230529A2/en
Publication of EP0230529A3 publication Critical patent/EP0230529A3/en
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Publication of EP0230529B1 publication Critical patent/EP0230529B1/en
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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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B2013/0428—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with switchable internal or external pilot pressure source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87193—Pilot-actuated
    • Y10T137/87209—Electric

Definitions

  • the invention relates to a valve arrangement for shutting off or releasing the connection between a hydrostatic machine that can be operated as a motor or pump and a pressure accumulator that can be hydraulically charged or discharged by the latter, with features of the type specified in the preamble of claim 1.
  • the invention is based on a prior art according to the technical publication "Hydrobus", final technical report - hydrostatic braking energy recovery for city buses - April 1983. There is a memory shut-off block shown and briefly described on pages 41 and 286, on which the features mentioned in the introduction can be read are.
  • This known storage shut-off block summarizes the shut-off for both a high-pressure and a low-pressure store. Although this allows a relatively compact design, there are certain disadvantages. Since each memory has a certain spatial extent, the known memory shut-off block cannot be attached directly to the respective memory, but must be connected to it via appropriate pressure lines. This poses a certain safety risk, because such a pressure line could leak, for example, due to vibrations occurring during operation. It should also be borne in mind that in a high-pressure accumulator, when it is completely filled, there can generally be a pressure of over 400 bar. If this high pressure accumulator pressurized in this way were suddenly relieved, this could lead to damage in the control valve, in the line paths and also in the shut-off valve.
  • this oil drainage which is accompanied by a pressure relief, is carried out via separate devices in collection containers which are to be provided for this purpose.
  • each pressure accumulator is assigned its own valve arrangement of the type claimed.
  • a hydraulic control circuit is controlled in principle by means of a leak-free control valve, for the control of which only relatively small forces are required, which supplies the actuating forces required to actuate the shut-off valve.
  • the shut-off valve is formed by a 2/2-way valve in cartridge design. This forms a ready-to-install unit and can be replaced with another, similar valve if necessary with little effort, e.g. if Safety regulations should prescribe the regular replacement of the shut-off valve.
  • This shut-off valve has a control cylinder in which an actuating piston is slidably received.
  • This actuating piston carries a valve body that can be hermetically sealed against a valve seat and always seals leak-free even against extremely high pressure drops, provided that a sufficiently high control pressure acts on the actuating piston, because the pressure tendencies prevailing on both sides of the valve seat tend to close the actuating piston in this way move so that the valve body lifts off the valve seat.
  • the two outputs of the shut-off valve on each side of the valve seat are each connected to a shuttle valve, the third connection of which is connected to the control cylinder of the shut-off valve.
  • the pressure drop driving the shuttle valve corresponds to the pressure drop across the shut-off valve, the higher pressure applied to it being applied by the shuttle valve to the control cylinder becomes.
  • a pressure which is sufficient to press the valve body sufficiently firmly against the valve seat therefore always acts on the actuating piston.
  • the actuating piston is sealingly guided in the control cylinder. That connection of the shut-off valve, which is only separated from the inside of the control cylinder by the actuating piston, is connected to the pressure accumulator. As long as the shut-off valve is closed, in particular during those times in which the device equipped with the valve arrangement according to the invention is not used, there is no pressure drop across the actuating piston, so that the shut-off valve can shut off leak-tight for any length of time.
  • a leak-free, remotely operable control valve is arranged between its control cylinder and the shuttle valve, which in its rest position establishes the connection between the shuttle valve and the control cylinder, but in the working position shuts off the shuttle valve and relieves the control cylinder of a tank or reservoir .
  • the pressures are the same as in the shut-off valve, but the throughput of hydraulic fluid to be controlled is only low, since this is only used to actuate the shut-off valve. It is therefore possible to provide such a valve with an actuator which can be controlled by a control signal and which operates the valve reliably in a sufficiently short time.
  • the control valve Since the valve has a defined rest position, in which it connects the control cylinder of the shut-off valve with the shuttle valve, precaution is taken in the event of a control failure that the pressure accumulator is shut off.
  • the control valve is designed as a directional seat valve with an electromagnetic actuating device. It has a valve seat which hermetically seals its connection to the tank in the rest position of the control valve, so that the control pressure transmitted by the control valve in this operating state cannot escape to the tank.
  • the control valve is also designed so that any pressure forces that occur are directed perpendicular to the movement of its valve body, so that only relatively small actuating forces are required. Because of the small required channel cross section, the valve body of the control valve only has to cover a relatively short switching distance, so that an electromagnet as an actuator for the control valve is completely sufficient.
  • shut-off valve, the shuttle valve, the hydraulic parts of the control valve and the respective connecting lines are combined in a common block.
  • this is a pressure relief valve that connects the pressure accumulator to the tank and has the purpose of automatically reducing this excess pressure to a permissible value in the event of an unacceptable excess pressure in the pressure accumulator.
  • Such an impermissible excess pressure can be brought about, for example, by mechanical deformation of the pressure accumulator or its heating. It is thus possible to mount the pressure accumulator together with the valve arrangement according to the invention in a vehicle even at locations where it is exposed to the sun's rays or other heating. Furthermore, the latter configuration ensures that the pressure accumulator does not burst in the event of an accident.
  • a throttle is arranged in the feed line between the control valve and the control cylinder of the shut-off valve, and a throttle is arranged in the relief line leading from the control valve to the tank.
  • a blockage throttle is provided in the block between the line connected to the tank and the line connected to the pressure accumulator.
  • This shut-off throttle can optionally be provided with a servomotor.
  • This shut-off throttle is used to safely relieve the pressure in the reservoir towards the tank, which is necessary, for example, when repair or maintenance work on the pressure reservoir or on the valve arrangement has to be carried out. It is also possible to connect a servomotor assigned to the shut-off throttle to a monitoring device which is connected to two pressure measuring points, so that the pressure accumulator is automatically emptied when a fault occurs.
  • Said pressure measuring points are provided according to a preferred embodiment of the invention, namely on both sides of the shut-off valve, preferably in the respective control line to the shuttle valve.
  • Each pressure measuring point is equipped with a pressure sensor. Via these two pressure measuring points, every pressure relevant for operation and operational safety can be taken off, e.g. the supply pressure in the accumulator, the delivery pressure of the hydrostatic machine working as a pump and the like. More. When the shut-off valve is closed, the pressure drop measured must remain constant. If this is not the case, then there is a fault.
  • the two pressure measuring points can also be equipped with a device which takes remedial measures and / or triggers an alarm in the event of such a fault.
  • the invention thus creates a valve arrangement in the form of a compact block with safety functions for hydraulic accumulators with a blocking position, a continuous position and the possibility of emptying the accumulator directly into the oil tank via a shut-off throttle.
  • the control pressure for controlling the actual shut-off valve which is preferably designed as a 2/2-way valve in cartridge design, is taken directly from the connections for the accumulator or the connected hydraulic unit, the higher of the two pressures being selected in order to achieve a reliable holding effect. Furthermore, measuring connections for regulation, control or monitoring are provided.
  • the block-internal work and control lines are realized through bores, so that there is no risk of damage to the connecting lines there.
  • the block can advantageously be flanged directly to the pressure accumulator; however, it is equally possible to attach this block wherever this is particularly advantageous for spatial reasons.
  • the block does not have to be easily accessible from the outside.
  • Both the 2/2-way valve in the cartridge design and the directional seat valve controlling this are each absolutely sealed when closed, so that any pressure drop due to leakage is reliably avoided over a long period of time.
  • the chokes arranged in the control lines also serve to coordinate the switching time.
  • the shut-off block according to the invention is thus very compact and simple, can be attached to the pressure vessel as well as anywhere in a vehicle, and the control valve can be operated remotely, so that the shut-off block according to the invention is suitable for the electro-hydraulic control of the storage hydraulics.
  • the simple structure also guarantees safe operation.
  • shut-off block forming the valve arrangement according to the invention is shown schematically.
  • the shut-off block 5 shown has three hydraulic connections, namely a connection P for a hydrostatic machine which can be operated either as a pump or motor, a connection S for a high-pressure or low-pressure accumulator and a connection T for a tank or reservoir.
  • a 2/2-way valve C in a cartridge design is arranged inside the shut-off block 5 and has a control cylinder 6.
  • an actuating piston 9 is arranged in a sealing and movable manner and carries a valve body 10 on its side facing away from the pressure chamber of the control cylinder 6.
  • This valve body 10 is set up to seal against leakage in the end position shown in the drawing relative to a valve seat 11.
  • the valve seat 11 divides the interior of the valve C into a first space 7 with a connection B adjacent to the actuating piston 9 and a second space 8 with a connection A.
  • the connection B is connected via a working line 3 to the storage connection S during the connection A is connected via a working line 4 to the connection P for the hydrostatic machine.
  • a spring is preferably provided in the valve C, which presses the actuating piston 9 and thus the valve body 10 against the valve seat 11.
  • the working line 4 is connected via a control line 1 to one input of a shuttle valve WV, the other input via a control line 2 is connected to the working line 3.
  • the two control lines 1 and 2 and thus also the respective working line 4 and 3 are each formed with a measuring connection M 'or M''on which a pressure sensor is arranged.
  • the output of the shuttle valve WV is connected to the control cylinder 6 of the shut-off valve C via a further control line 15.
  • the shuttle valve WV has a valve body, which blocks each of the two inputs of the shuttle valve WV, at which the lower pressure is applied, so that the control cylinder 6 of the shut-off valve C can always be connected to that working line 3 or 4, in each of which the higher pressure prevails. It is therefore always ensured that when the control cylinder 6 is pressurized, it is so high that the valve body 10 of the shut-off valve C remains pressed against the valve seat 11 in a sealing manner.
  • a control valve Wang is formed as a directional seat valve, the rest position of which is shown in the drawing and which is moved out of this rest position against the force of a spring 13 when an electromagnet 12 is actuated.
  • control valve W connects the two branches of the control line 15, between which the control valve W is arranged.
  • a discharge line 14 which connects the control valve W with the connection T for the storage container, is blocked free of leakage by an absolutely tight valve seat seal.
  • control valve W If the control valve W is now moved into its working position against the action of the spring 13 by actuating the electromagnet 12, then that branch of the control line 15 which leads to the shut-off valve C is connected to the relief line 14, while the other branch of the control line 15 is hermetically sealed becomes.
  • control cylinder 6 of the shut-off valve C is emptied via the port T and is therefore pressure-free, so that only the pressure prevailing in the interior spaces 7 and 8 of the shut-off valve C acts on the actuating piston 9, displaces this adjusting piston 9 in the drawing upward and thus lifts the valve body 10 from the valve seat 11, whereby the interiors 7 and 8 and thus the connections B and A of the shut-off valve C are connected to one another and can flow freely between the connections S and P via the working lines 3 and 4 hydraulic working fluid.
  • a first throttle DR ' is provided in the control line 15 between the shut-off valve C and the control valve W.
  • a second throttle DR '' is provided in the relief line 14 between the control valve W and the tank connection T.
  • shut-off block also has a pressure relief valve DB, which connects the working line 3 to the relief line 14 and thus the connections S and T to one another.
  • This pressure relief valve DB relieves any pressure increases caused by external influences (e.g. temperature, deformation, etc.), which can occur particularly in the event of an accident.
  • a shut-off throttle D is arranged, through the opening of which the working line 3 can also be connected to the relief line 14 and thus the connection S for the pressure accumulator to the connection T for the tank. It is thus possible to lower the pressure accumulator by opening the shut-off throttle D and to make it pressure-free. This is necessary, for example, if repairs or a change in the hydraulic oil have to be carried out.
  • the shut-off throttle D can be operated remotely and can be coupled to a monitoring device or a sensor.
  • a monitoring device or a sensor For example, it is possible to couple the shut-off throttle D with a cover that closes the arrangement in such a way that the pressure accumulator is emptied when the cover is removed. It is also possible to provide the shut-off throttle D with an easily accessible handle, via which e.g. the pressure accumulator can be released after an accident.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Safety Valves (AREA)

Abstract

A valve arrangement for connecting a hydraulic machine, such as a pump or a motor, with a pressure accumulator in which a conventional manual shutoff valve is replaced by a leak-proof pressure controlled valve whose operating pressure signal is supplied by a shuttle valve from that one of two ports of the pressure controlled valve at which the higher pressure prevails at a given time. The pressure controlled valve is supplied with fluid under pressure by way of a leak-proof remote controlled slide valve.

Description

Die Erfindung betrifft eine Ventilanordnung zum Absperren bzw. Freigeben der Verbindung zwischen einer als Motor bzw. Pumpe betreibbaren hydrostatischen Maschine und einem durch letztere hydraulisch auf- bzw. entladbaren Druckspeicher mit Merkmalen der im Oberbegriff des Anspruchs 1 angegebenen Art.The invention relates to a valve arrangement for shutting off or releasing the connection between a hydrostatic machine that can be operated as a motor or pump and a pressure accumulator that can be hydraulically charged or discharged by the latter, with features of the type specified in the preamble of claim 1.

Die Erfindung geht aus von einem Stand der Technik gemäß der Fachveröffentlichung ,,Hydrobus", technischer Schlußbericht - hydrostatische Bremsenergierückgewinnung für Stadtlinienbusse - April 1983. Dort ist in Seiten 41 und 286 ein Speicherabsperrblock dargestellt und kurz beschrieben, auf den die eingangs genannten Merkmale zu lesen sind.The invention is based on a prior art according to the technical publication "Hydrobus", final technical report - hydrostatic braking energy recovery for city buses - April 1983. There is a memory shut-off block shown and briefly described on pages 41 and 286, on which the features mentioned in the introduction can be read are.

Dieser bekannte Speicherabsperrblock faßt die Absperrung sowohl für einen Hochdruck- als auch einen Niederdruckspeicher in sich zusammen. Obschon dies eine relativ gedrängte Bauweise erlaubt, so ist diese doch mit gewissen Nachteilen behaftet. Da jeder Speicher eine gewisse räumliche Ausdehnung hat, kann der bekannte Speicherabsperrblock nicht un mittelbar am jeweiligen Speicher angebracht werden, sondern muß über entsprechende Druckleitungen mit diesem verbunden werden. Dies birgt ein gewisses Sicherheitsrisiko in sich, denn eine solche Druckleitung konnte zum Beispiel aufgrund von während des Betriebes auftretenden Erschütterungen undicht werden. Dabei ist auch zu bedenken, daß in einem Hochdruckspeicher bei dessen vollständiger Befüllung in der Regel ein Druck von über 400 bar herrschen kann. Wenn dieser derart druckbeaufschlagte Hochdruckspeicher schlagartig entlastet würde, könnte dies zu Schäden im Steuerventil, in den Leitungswegen und auch im Absperrventil führen.This known storage shut-off block summarizes the shut-off for both a high-pressure and a low-pressure store. Although this allows a relatively compact design, there are certain disadvantages. Since each memory has a certain spatial extent, the known memory shut-off block cannot be attached directly to the respective memory, but must be connected to it via appropriate pressure lines. This poses a certain safety risk, because such a pressure line could leak, for example, due to vibrations occurring during operation. It should also be borne in mind that in a high-pressure accumulator, when it is completely filled, there can generally be a pressure of over 400 bar. If this high pressure accumulator pressurized in this way were suddenly relieved, this could lead to damage in the control valve, in the line paths and also in the shut-off valve.

Darüber hinaus kann es notwendig werden, den jeweiligen Speicher für Reparatur- oder Wartungsaufgaben an diesem selbst oder dem Speicherabsperrblock zu entladen. In der Regel erfolgt diese mit einer Druckentlastung einhergehende Ölablassung über separate Vorrichtungen in extra hierfür bereitzustellende Auffangbehälter.It may also be necessary to unload the respective memory for repair or maintenance tasks on the memory itself or on the memory shut-off block. As a rule, this oil drainage, which is accompanied by a pressure relief, is carried out via separate devices in collection containers which are to be provided for this purpose.

Es ist daher Aufgabe der Erfindung, die hinsichtliche Ausgestaltung und Funktion bekannte gattungsgemäße Ventilanordnung dahingehend zu verbessern, daß eine sichere Beherrschung der Auf- und Entladung eines Druckspeichers unter Vermeidung irgendwelcher systeminterner Schäden möglich und außerdem der Druckspeicher bei Notwendigkeit rasch und einfach entleerbar ist.It is therefore an object of the invention to improve the known design and function of the generic valve arrangement known in such a way that reliable control of the charging and discharging of a pressure accumulator Avoidance of any internal damage possible and the pressure accumulator can be quickly and easily drained if necessary.

Diese Aufgabe ist erfindungsgemäß durch eine Ventilanordnung der gattungsgemäßen Art in Verbindung mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention by a valve arrangement of the generic type in conjunction with the characterizing features of claim 1.

Vorteilhafte Ausgestaltungen dieser Lösung sind im Unteranspruch angegeben.Advantageous embodiments of this solution are specified in the subclaim.

Der erfindungsgemäßen Lösung liegt das Prinzip zugrunde, im Gegensatz zum eingangs diskutierten Stand der Technik jedem Druckspeicher eine eigene Ventilanordnung der beanspruchten Art zuzuordnen.The solution according to the invention is based on the principle that, in contrast to the prior art discussed at the outset, each pressure accumulator is assigned its own valve arrangement of the type claimed.

Bei dieser Ventilanordnung wird im Prinzip mittels eines leckagefreien Steuerventils, zu dessen Ansteuerung nur verhältnismäßig geringe Kräfte erforderlich sind, ein hydraulischer Steuerkreis gesteuert, der die zum Betätigen des Absperrventils erforderlichen Stellkräfte liefert.In this valve arrangement, a hydraulic control circuit is controlled in principle by means of a leak-free control valve, for the control of which only relatively small forces are required, which supplies the actuating forces required to actuate the shut-off valve.

Das Absperrventil ist durch ein 2/2-Wegeventil in Cartridge-Ausführung gebildet. Dieses bildet eine einbaufertige Einheit und kann mit geringem Aufwand ggf. gegen ein anderes, gleichartiges Ventil ausgewechselt werden, wenn z.B. Sicherheitsvorschriften die turnusmäßige Erneuerung des Absperrventils vorschreiben sollten.The shut-off valve is formed by a 2/2-way valve in cartridge design. This forms a ready-to-install unit and can be replaced with another, similar valve if necessary with little effort, e.g. if Safety regulations should prescribe the regular replacement of the shut-off valve.

Dieses Absperrventil weist einen Steuerzylinder auf, in welchem ein Stellkolben verschieblich aufgenommen ist. Dieser Stellkolben trägt einen Ventilkörper, der hermetisch dichtend gegen einen Ventilsitz anlegbar ist und auch gegenüber äußerst hohem Druckgefälle stets leckagefrei abdichtet, vorausgesetzt, es wirkt ein ausreichend hoher Steuerdruck auf den Stellkolben ein, denn die beiderseits des Ventilsitzes vorherrschenden Drücketrachten danach, den Stellkolben so zu verschieben, daß der Ventilkörper vom Ventilsitz abhebt. Um in jedem Fall einen ausreichenden Steuerdruck bereitzustellen, sind die beiden Ausgänge des Absperrventiles beiderseits des Ventiisitzes jeweils mit einem Wechselventil verbunden, dessen dritter Anschluß mit dem Steuerzylinder des Absperrventils verbunden ist. Das das Wechselventil ansteuernde Druckgefälle entspricht dem über das Absperrventil hinweg vorliegenden Druckgefälle, wobei der jeweils höhere, an diesem anliegende Druck vom Wechselventil an den Steuerzylinder angelegt wird. Es wirkt somit auf den Stellkolben stets ein solcher Druck ein, der ausreicht, um den Ventilkörper ausreichend fest gegen den Ventilsitz anzudrücken. Der Stellkolben ist dichtend im Steuerzylinder geführt. Jener Anschluß des Absperrventiles, der vom Inneren des Steuerzylinders nur durch den Stellkolben getrennt ist, ist mit dem Druckspeicher verbunden. Solange das Absperrventil geschlossen ist, also besonders während jener Zeiten, in denen die mitder erfindungsgemäßen Ventilanordnung ausgestattete Einrichtung nicht benutzt wird, tritt somit über den Stellkolben hinweg keinerlei Druckgefälle auf, so daß das Absperrventil über einen beliebig langen Zeitraum hinweg leckagedicht absperren kann. Zum Öffnen des Absperrventiles ist zwischen dessen Steuerzylinder und dem Wechselventil ein leckagefreies, fernbetätigbares Steuerventil angeordnet, das in seiner Ruhelage die Verbindung zwischen dem Wechselventil und dem Steuerzylinder herstellt, dagegen in der Arbeitslage zum Wechselventil hin absperrt und den Steuerzylinder zu einem Tank oder Vorratsbehälter hin entlastet. In diesem Steuerventil herrschen zwar, wie oben erwähnt, die gleich hohen Drücke wie im Absperrventil, aber der zu steuernde Durchsatz an hydraulischer Flüssigkeit ist nur gering, da diese nur zum Ansteuern des Absperrventiles verwendet wird. Daher ist es möglich, ein solches Ventil mit einem Stellantrieb zu versehen, der durch ein Steuersignal ansteuerbar ist und in ausreichend kurzer Zeit zuverlässig das Ventil betätigt. Da das Ventil eine definierte Ruhelage aufweist, in welcher es den Steuerzylinder des Absperrventils mit dem Wechselventil verbindet, ist bei Ausfall der Steuerung Vorsorge getroffen, daß der Druckspeicher abgesperrt wird. Das Steuerventil ist als Wegesitzventil mit elektromagnetischer Betätigungseinrichtung ausgebildet. Es weist einen Ventilsitz auf, der in Ruhelage des Steuerventils dessen Anschluß zum Tank hin hermetisch abdichtet, so daß der in diesem Betriebszustand vom Steuerventil übertragene Steuerdruck nicht zum Tank hin entweichen kann. Das Steuerventil ist ferner so ausgebildet, daß etwa auftretende Druckkräfte senkrecht zur Bewegung seines Ventilkörpers gerichtet sind, so daß nur verhältnismäßig geringe Stellkräfte erforderlich sind. Wegen des geringen erforderlichen Kanalquerschnitts muß der Ventilkörper des Steuerventils auch nureinen verhältnismäßig kurzen Schaltweg zurücklegen, so daß ein Elektromagnet als Stellantrieb für das Steuerventil völlig ausreichend ist.This shut-off valve has a control cylinder in which an actuating piston is slidably received. This actuating piston carries a valve body that can be hermetically sealed against a valve seat and always seals leak-free even against extremely high pressure drops, provided that a sufficiently high control pressure acts on the actuating piston, because the pressure tendencies prevailing on both sides of the valve seat tend to close the actuating piston in this way move so that the valve body lifts off the valve seat. In order to provide a sufficient control pressure in each case, the two outputs of the shut-off valve on each side of the valve seat are each connected to a shuttle valve, the third connection of which is connected to the control cylinder of the shut-off valve. The pressure drop driving the shuttle valve corresponds to the pressure drop across the shut-off valve, the higher pressure applied to it being applied by the shuttle valve to the control cylinder becomes. A pressure which is sufficient to press the valve body sufficiently firmly against the valve seat therefore always acts on the actuating piston. The actuating piston is sealingly guided in the control cylinder. That connection of the shut-off valve, which is only separated from the inside of the control cylinder by the actuating piston, is connected to the pressure accumulator. As long as the shut-off valve is closed, in particular during those times in which the device equipped with the valve arrangement according to the invention is not used, there is no pressure drop across the actuating piston, so that the shut-off valve can shut off leak-tight for any length of time. To open the shut-off valve, a leak-free, remotely operable control valve is arranged between its control cylinder and the shuttle valve, which in its rest position establishes the connection between the shuttle valve and the control cylinder, but in the working position shuts off the shuttle valve and relieves the control cylinder of a tank or reservoir . In this control valve, as mentioned above, the pressures are the same as in the shut-off valve, but the throughput of hydraulic fluid to be controlled is only low, since this is only used to actuate the shut-off valve. It is therefore possible to provide such a valve with an actuator which can be controlled by a control signal and which operates the valve reliably in a sufficiently short time. Since the valve has a defined rest position, in which it connects the control cylinder of the shut-off valve with the shuttle valve, precaution is taken in the event of a control failure that the pressure accumulator is shut off. The control valve is designed as a directional seat valve with an electromagnetic actuating device. It has a valve seat which hermetically seals its connection to the tank in the rest position of the control valve, so that the control pressure transmitted by the control valve in this operating state cannot escape to the tank. The control valve is also designed so that any pressure forces that occur are directed perpendicular to the movement of its valve body, so that only relatively small actuating forces are required. Because of the small required channel cross section, the valve body of the control valve only has to cover a relatively short switching distance, so that an electromagnet as an actuator for the control valve is completely sufficient.

Das Absperrventil, das Wechselventil, die hydraulischen Teile des Steuerventils und die jeweiligen Verbindungsleitungen sind in einem gemeinsamen Block zusammengefaßt.The shut-off valve, the shuttle valve, the hydraulic parts of the control valve and the respective connecting lines are combined in a common block.

Erfindungsgemäß sind in diesem gemeinsamen Block als weitere Organe jene gemäß dem Kennzeichen des Anspruchs 1 vorgesehen. Dabei handelt es sich um ein Druckbegrenzungsventil, das den Druckspeicher mit dem Tank verbindet und den Zweck hat, im Fall des Auftretens eines unzulässigen Überdrucks im Druckspeicher diesen Überdruck bis auf einen zulässigen Wert selbsttätig zu senken. Ein solcher unzulässiger Überdruck kann beispielsweise durch mechanische Verformung des Druckspeichers oder dessen Erwärmung herbeigeführt werden. Es ist somit möglich, den Druckspeicher zusammen mit der erfindungsgemäßen Ventilanordnung in einem Fahrzeug selbst an solchen Stellen anzubringen, wo er der Sonneneinstrahlung oder sonstiger Erwärmung ausgesetzt ist. Ferner ist durch die letztgenannte Ausgestaltung sichergestellt, daß der Druckspeicher etwa im Falle eines Unfalls nicht platzt.According to the invention, in this common block, further organs are provided according to the characterizing part of claim 1. This is a pressure relief valve that connects the pressure accumulator to the tank and has the purpose of automatically reducing this excess pressure to a permissible value in the event of an unacceptable excess pressure in the pressure accumulator. Such an impermissible excess pressure can be brought about, for example, by mechanical deformation of the pressure accumulator or its heating. It is thus possible to mount the pressure accumulator together with the valve arrangement according to the invention in a vehicle even at locations where it is exposed to the sun's rays or other heating. Furthermore, the latter configuration ensures that the pressure accumulator does not burst in the event of an accident.

Desweiteren sind im Block erfindungsgemäß eine Drossel in der Zuleitung zwischen Steuerventil und Steuerzylinder des Absperrventils sowie eine Drossel in der vom Steuerventil zum Tank führenden Entlastungsleitung angeordnet. Diese Drosseln sorgen jeweils dafür, daß der Steuerzylinder, in dem ein Druck von über 400 bar herrschen kann, nicht explosionsartig entlastetwird, was zu Schäden im Steuerventil, in den Leitungen und auch im Absperrventil führen könnte.Furthermore, according to the invention, a throttle is arranged in the feed line between the control valve and the control cylinder of the shut-off valve, and a throttle is arranged in the relief line leading from the control valve to the tank. These throttles ensure that the control cylinder, in which a pressure of over 400 bar can prevail, is not explosively relieved, which could lead to damage in the control valve, in the lines and also in the shut-off valve.

Außerdem ist im Block erfindungsgemäß eine Absperrdrossel zwischen mit Tank verbundener und der mit dem Druckspeicher verbundenen Leitung gegeben. Diese Absperrdrossel kann gegebenenfalls mit einem Stellmotor versehen sein. Diese Absperrdrossel dient dazu, den Druck im Speicher gefahrlos zum Tank hin zu entlasten, was etwa dann erforderlich ist, wenn Reparatur- oder Wartungsarbeiten am Druckspeicher oder an der Ventilanordnung durchgeführt werden müssen. Es ist auch möglich, einen der Absperrdrossel zugeordneten Stellmotor mit einer Überwachungseinrichtung zu verbinden, die an zwei Druckmeßstellen angeschlossen ist, so daß bei Auftreten einer Störung der Druckspeicher selbsttätig entleert wird.In addition, according to the invention, a blockage throttle is provided in the block between the line connected to the tank and the line connected to the pressure accumulator. This shut-off throttle can optionally be provided with a servomotor. This shut-off throttle is used to safely relieve the pressure in the reservoir towards the tank, which is necessary, for example, when repair or maintenance work on the pressure reservoir or on the valve arrangement has to be carried out. It is also possible to connect a servomotor assigned to the shut-off throttle to a monitoring device which is connected to two pressure measuring points, so that the pressure accumulator is automatically emptied when a fault occurs.

Die besagten Druckmeßstellen sind gemäß einer bevorzugten Ausgestaltung der Erfindung vorgesehen, und zwar beiderseits des Absperrventils, vorzugsweise in derjeweiligen Steuerleitung zum Wechselventil hin. Jede Druckmeßstelle ist mit einem Druckmeßfühler ausgestattet. Über diese beiden Druckmeßstellen kann jeder für den Betrieb und die Betriebssicherheit relevante Druck abgenommen werden, so z.B. der Vorratsdruck im Speicher, der Förderdruck der als Pumpe arbeitenden hydrostatischen Maschine und dgl. mehr. Bei geschlossenem Absperrventil muß das gemessene Druckgefälle konstant bleiben. Ist dies nicht der Fall, dann liegt eine Störung vor. Die beiden Druckmeßstellen können auch mit einer Einrichtung ausgestattet sein, welche bei einer solchen Störung Abhilfemaßnahmen ergreifen und/oder Alarm auslösen.Said pressure measuring points are provided according to a preferred embodiment of the invention, namely on both sides of the shut-off valve, preferably in the respective control line to the shuttle valve. Each pressure measuring point is equipped with a pressure sensor. Via these two pressure measuring points, every pressure relevant for operation and operational safety can be taken off, e.g. the supply pressure in the accumulator, the delivery pressure of the hydrostatic machine working as a pump and the like. More. When the shut-off valve is closed, the pressure drop measured must remain constant. If this is not the case, then there is a fault. The two pressure measuring points can also be equipped with a device which takes remedial measures and / or triggers an alarm in the event of such a fault.

Die Erfindung schafft somit eine Ventilanordnung in Form eines kompakten Blockes mit Sicherheitsfunktionen für hydraulische Speicher mit einer Sperrstellung, einer Durchlaufstellung und der Möglichkeit zum Entleeren des Speichers unmittelbar in den Öltank über eine Absperrdrossel. Der Steuerdruck zur Ansteuerung des eigentlichen Absperrventils, das bevorzugt als 2/2-Wegeventil in Cartridgebauweise ausgebildet ist, wird unmittelbar den Anschlüssen für Speicher oder die angeschlossene Hydraulikeinheit entnommen, wobei der jeweils höhere der beiden Drücke ausgewählt wird, um eine zuverlässige Haltewirkung zu erzielen. Ferner sind Meßanschlüsse für die Regelung, Steuerung oder Kontrolle vorgesehen. Die blockinternen Arbeits- und Steuerleitungen sind durch Bohrungen realisiert, so daß die Gefahr von Beschädigungen der Verbindungsleitungen dort ausgeschlossen ist.The invention thus creates a valve arrangement in the form of a compact block with safety functions for hydraulic accumulators with a blocking position, a continuous position and the possibility of emptying the accumulator directly into the oil tank via a shut-off throttle. The control pressure for controlling the actual shut-off valve, which is preferably designed as a 2/2-way valve in cartridge design, is taken directly from the connections for the accumulator or the connected hydraulic unit, the higher of the two pressures being selected in order to achieve a reliable holding effect. Furthermore, measuring connections for regulation, control or monitoring are provided. The block-internal work and control lines are realized through bores, so that there is no risk of damage to the connecting lines there.

Der Block kann vorteilhafter Weise unmittelbar am Druckspeicher angeflanscht sein; es ist aber ebensogut auch möglich, diesen Block überall dort anzubringen, wo dies etwa aus räumlichen Gründen besonders vorteilhaft ist. Hierbei muß der Block auch nicht ohne weiteres von außen zugänglich sein.The block can advantageously be flanged directly to the pressure accumulator; however, it is equally possible to attach this block wherever this is particularly advantageous for spatial reasons. The block does not have to be easily accessible from the outside.

Sowohl das 2/2-Wegeventil in Cartridgebauweise als auch das dieses steuernde Wegesitzventil ist jeweils, wenn geschlossen, absolut dicht, so daß auch über längere Zeit hinweg irgendein Druckabfall infolge von Leckage zuverlässig vermieden ist.Both the 2/2-way valve in the cartridge design and the directional seat valve controlling this are each absolutely sealed when closed, so that any pressure drop due to leakage is reliably avoided over a long period of time.

Die in den Steuerleitungen angeordneten Drosseln dienen auch zur Abstimmung der Schaltzeit.The chokes arranged in the control lines also serve to coordinate the switching time.

Der erfindungsgemäße Absperrblock ist somit sehr kompakt und einfach aufgebaut, kann sowohl am Druckbehälter als auch an einer beliebigen Stelle etwa in einem Fahrzeug befestigt werden und es ist die Fernbedienung des Steuerventils möglich, so daß sich der erfindungsgemäße Absperrblock für die elektrohydraulische Regelung der Speicherhydraulik eignet. Der einfache Aufbau garantiert ferner die sichere Funktion.The shut-off block according to the invention is thus very compact and simple, can be attached to the pressure vessel as well as anywhere in a vehicle, and the control valve can be operated remotely, so that the shut-off block according to the invention is suitable for the electro-hydraulic control of the storage hydraulics. The simple structure also guarantees safe operation.

Nachstehend ist der Gegenstand der Erfindung anhand der beigefügten, schematischen Zeichnung beispielsweise noch näher erörtert. In der einzigen Figur ist schematisch ein die erfindungsgemäße Ventilanordnung bildender Absperrblock dargestellt.The subject matter of the invention is discussed in more detail below, for example, using the attached schematic drawing. In the single figure, a shut-off block forming the valve arrangement according to the invention is shown schematically.

Der gezeigte Absperrblock 5 weist drei hydraulische Anschlüsse auf, und zwar einen Anschluß P für eine entweder als Pumpe oder Motor betreibbare hydrostatische Maschine, einen Anschluß S für einen Hochdruck- oder Niederdruckspeicher und einen Anschluß T für einen Tank oder Vorratsbehälter.The shut-off block 5 shown has three hydraulic connections, namely a connection P for a hydrostatic machine which can be operated either as a pump or motor, a connection S for a high-pressure or low-pressure accumulator and a connection T for a tank or reservoir.

Im Inneren des Absperrblocks 5 ist ein 2/2-Wegeventil C in Cartridgebauweise angeordnet, das einen Steuerzylinder 6 aufweist. In diesem ist dichtend und beweglich ein Stellkolben 9 angeordnet, der an seiner vom Druckraum des Steuerzylinders 6 abgewandten Seite einen Ventilkörper 10 trägt. Dieser Ventilkörper 10 ist dazu eingerichtet, in der in der Zeichnung gezeigten Endlage gegenüber einem Ventilsitz 11 leckagefrei abzudichten.A 2/2-way valve C in a cartridge design is arranged inside the shut-off block 5 and has a control cylinder 6. In this, an actuating piston 9 is arranged in a sealing and movable manner and carries a valve body 10 on its side facing away from the pressure chamber of the control cylinder 6. This valve body 10 is set up to seal against leakage in the end position shown in the drawing relative to a valve seat 11.

Der Ventilsitz 11 unterteilt den Innenraum des Ventils C in einen ersten Raum 7 mit einem Anschluß B angrenzend an den Stellkolben 9 und einen zweiten Raum 8 mit einem Anschluß A. Der Anschluß B ist über eine Arbeitsleitung 3 mit dem Speicheranschluß S verbunden, während der Anschluß A über eine Arbeitsleitung 4 mit dem Anschluß P für die hydrostatische Maschine verbunden ist. Vorzugsweise ist im Ventil C eine Feder vorgesehen, die den Stellkolben 9 und damit den Ventilkörper 10 in Anlage gegen den Ventilsitz 11 drückt.The valve seat 11 divides the interior of the valve C into a first space 7 with a connection B adjacent to the actuating piston 9 and a second space 8 with a connection A. The connection B is connected via a working line 3 to the storage connection S during the connection A is connected via a working line 4 to the connection P for the hydrostatic machine. A spring is preferably provided in the valve C, which presses the actuating piston 9 and thus the valve body 10 against the valve seat 11.

Die Arbeitsleitung 4 ist über eine Steuerleitung 1 mit dem einen Eingang eines Wechselventiles WV verbunden, dessen anderer Eingang über eine Steuerleitung 2 mit der Arbeitsleitung 3 verbunden ist. Die beiden Steuerleitungen 1 und 2 und damit auch die jeweilige Arbeitsleitung 4 und 3 sind jeweils mit einem Meßanschluß M' bzw. M'' ausgebildet, an dem ein Druckmeßfühler angeordnet ist.The working line 4 is connected via a control line 1 to one input of a shuttle valve WV, the other input via a control line 2 is connected to the working line 3. The two control lines 1 and 2 and thus also the respective working line 4 and 3 are each formed with a measuring connection M 'or M''on which a pressure sensor is arranged.

Der Ausgang des Wechselventils WV ist über eine weitere Steuerleitung 15 mit dem Steuerzylinder 6 des Absperrventils C verbunden.The output of the shuttle valve WV is connected to the control cylinder 6 of the shut-off valve C via a further control line 15.

Das Wechselventil WV weist einen Ventilkörper auf, der jeweils jenen der beiden Eingänge des Wechselventils WV sperrt, an dem der jeweils kleinere Druck ansteht, so daß der Steuerzylinder 6 des Absperrventils C stets mit jener Arbeitsleitung 3 oder 4 in Verbindung bringbar ist, in welcher jeweils der höhere Druck vorherrscht. Es ist somit stets dafür Vorsorge getroffen, daß, wenn der Steuerzylinder 6 mit Druck beaufschlagt ist, dieser so hoch ist, daß der Ventilkörper 10 des Absperrventils C dichtend gegen den Ventilsitz 11 angedrückt bleibt.The shuttle valve WV has a valve body, which blocks each of the two inputs of the shuttle valve WV, at which the lower pressure is applied, so that the control cylinder 6 of the shut-off valve C can always be connected to that working line 3 or 4, in each of which the higher pressure prevails. It is therefore always ensured that when the control cylinder 6 is pressurized, it is so high that the valve body 10 of the shut-off valve C remains pressed against the valve seat 11 in a sealing manner.

In der Steuerleitung 15 ist ein als Wegesitzventil aus gebildetes Steuerventil Wangebracht, dessen Ruhelage in der Zeichnung gezeigt ist und das bei Betätigung eines Elektromagneten 12 gegen die Kraft einer Feder 13 aus dieser Ruhelage heraus bewegt wird.In the control line 15 a control valve Wang is formed as a directional seat valve, the rest position of which is shown in the drawing and which is moved out of this rest position against the force of a spring 13 when an electromagnet 12 is actuated.

In der Ruhelage verbindet das Steuerventil W die beiden Zweige der Steuerleitung 15, zwischen welchen das Steuerventil W angeordnet ist. Gleichzeitig wird durch eine absolut dichte Ventilsitzabdichtung eine Entlastungsleitung 14 leckagefrei abgesperrt, die das Steuerventil W mit dem Anschluß T für den Vorratsbehälter verbindet.In the rest position, the control valve W connects the two branches of the control line 15, between which the control valve W is arranged. At the same time, a discharge line 14, which connects the control valve W with the connection T for the storage container, is blocked free of leakage by an absolutely tight valve seat seal.

Wird nun durch Ansteuern des Elektromagneten 12 das Steuerventil W gegen die Wirkung der Feder 13 in seine Arbeitslage versetzt, dann wird jener Zweig der Steuerleitung 15, der zum Absperrventil C hinführt, mit der Entlastungsleitung 14 verbunden, während der andere Zweig der Steuerleitung 15 hermetisch abgedichtet wird. In diesem Fall wird der Steuerzylinder 6 des Absperrventils C über den Anschluß T entleert und somit druckfrei, so daß auf den Stellkolben 9 des Absperrventils C nur noch der in dessen Innenräumen 7 und 8 herrschende Druck einwirkt, diesen Stellkolben 9 in der Zeichnung nach oben verschiebt und somit den Ventilkörper 10 vom Ventilsitz 11 abhebt, wodurch die Innenräume 7 und 8 und somit die Anschlüsse B und A des Absperrventils C miteinander verbunden werden und zwischen den Anschlüssen S und P über die Arbeitsleitungen 3 und 4 ungehindert hydraulische Arbeitsflüssigkeit strömen kann.If the control valve W is now moved into its working position against the action of the spring 13 by actuating the electromagnet 12, then that branch of the control line 15 which leads to the shut-off valve C is connected to the relief line 14, while the other branch of the control line 15 is hermetically sealed becomes. In this case, the control cylinder 6 of the shut-off valve C is emptied via the port T and is therefore pressure-free, so that only the pressure prevailing in the interior spaces 7 and 8 of the shut-off valve C acts on the actuating piston 9, displaces this adjusting piston 9 in the drawing upward and thus lifts the valve body 10 from the valve seat 11, whereby the interiors 7 and 8 and thus the connections B and A of the shut-off valve C are connected to one another and can flow freely between the connections S and P via the working lines 3 and 4 hydraulic working fluid.

Zwischen dem Absperrventil C und dem Steuerventil W ist in der Steuerleitung 15 eine erste Drossel DR' vorgesehen. Außerdem ist in der Entlastungsleitung 14 zwischen dem Steuerventil W und dem Tankanschluß T eine zweite Drossel DR'' vorgesehen. Diese beiden Drosseln sind dazu bestimmt, den explosionsartigen Druckabfall im Steuerzylinder 6 des Absperrventils C zu verhindern und das gesteuerte, aber rasche Öffnen des Absperrventils C mit einer vorbestimmten Geschwindigkeit bzw. in einer vorbestimmten Öffnungszeit zu ermöglichen.A first throttle DR 'is provided in the control line 15 between the shut-off valve C and the control valve W. In addition, a second throttle DR '' is provided in the relief line 14 between the control valve W and the tank connection T. These two restrictors are intended to prevent the explosion-like pressure drop in the control cylinder 6 of the shut-off valve C and to enable the controlled but rapid opening of the shut-off valve C at a predetermined speed or in a predetermined opening time.

Außerdem weist der Absperrblock noch ein Druckbegrenzungsventil DB auf, welches die Arbeitsleitung 3 mit der Entlastungsleitung 14 und somit die Anschlüsse S und T miteinander verbindet. Dieses Druckbegrenzungsventil DB entlastet eventuelle Druckerhöhungen durch äußere Einflüsse (z.B. Temperatur, Verformung usw.), wie sie besonders im Fall eines Unfalls auftreten können.In addition, the shut-off block also has a pressure relief valve DB, which connects the working line 3 to the relief line 14 and thus the connections S and T to one another. This pressure relief valve DB relieves any pressure increases caused by external influences (e.g. temperature, deformation, etc.), which can occur particularly in the event of an accident.

Parallel zu diesem Druckbegrenzungsventil DB ist eine Absperrdrossel D angeordnet, durch deren Öffnen ebenfalls die Arbeitsleitung 3 mit der Entlastungsleitung 14 und somit der Anschluß S für den Druckspeicher mit dem Anschluß T für den Tank verbunden werden kann. Es ist somit möglich, durch Öffnen der Absperrdrossel D den Druckspeicher abzulassen und druckfrei zu machen. Dies ist beispielsweise dann erforderlich, wenn Reparaturen oder ein Wechsel des Hydrauliköles vorgenommen werden müssen.In parallel to this pressure relief valve DB, a shut-off throttle D is arranged, through the opening of which the working line 3 can also be connected to the relief line 14 and thus the connection S for the pressure accumulator to the connection T for the tank. It is thus possible to lower the pressure accumulator by opening the shut-off throttle D and to make it pressure-free. This is necessary, for example, if repairs or a change in the hydraulic oil have to be carried out.

Die Absperrdrossel D kann fernbedienbar sein und mit einer Überwachungseinrichtung oder einem Fühler gekoppelt sein. So ist es beispielsweise möglich, die Absperrdrossel D etwa mit einem die Anordnung verschließenden Deckel so zu koppeln, daß bei Abnahme dieses Deckels sicherheitshalber der Druckspeicher entleert wird. Es ist auch möglich, die Absperrdrossel D mit einer leicht zugänglichen Handhabe zu versehen, über welche z.B. nach einem Unfall der Druckspeicher abgelassen werden kann.The shut-off throttle D can be operated remotely and can be coupled to a monitoring device or a sensor. For example, it is possible to couple the shut-off throttle D with a cover that closes the arrangement in such a way that the pressure accumulator is emptied when the cover is removed. It is also possible to provide the shut-off throttle D with an easily accessible handle, via which e.g. the pressure accumulator can be released after an accident.

Die Ventilanordnung des gezeigten Absperrblockes weist die folgenden Funktionen auf:

  • 1. In der in der Zeichnung gezeigten Ruhelage ist das Absperrventil C geschlossen.
  • 2. Wenn das Steuerventil W angesteuert wird, dann öffnet das Absperrventil C.
  • 3. Eventuelle Druckerhöhungen durch äußere Einflüsse werden über das Druckbegrenzungsventil DB entlastet.
  • 4. Durch Öffnen der Absperrdrossel D kann der Druckspeicher in den Tank entleert werden.
  • 5. Das Absperrventil C wird steuerseitig mit dem jeweils höheren Druck der Anschlüsse A und B beaufschlagt.
The valve arrangement of the shut-off block shown has the following functions:
  • 1. In the rest position shown in the drawing, the shut-off valve C is closed.
  • 2. When the control valve W is activated, the shut-off valve C opens.
  • 3. Any pressure increases due to external influences are relieved via the pressure relief valve DB.
  • 4. By opening the shut-off throttle D, the pressure accumulator can be emptied into the tank.
  • 5. The shut-off valve C is acted upon by the higher pressure of ports A and B on the control side.

Claims (2)

  1. A valve arrangement for blocking or releasing the connection between a hydrostatic machine operable as a motor or pump and a pressure store which can be hydraulically charged or discharged by means of said machine, comprising
    a) a leakproof shutoff valve (C) formed by a 2/2 way valve in a cartridge design with a terminal (B) for the pressure store (S) and a terminal (A) for the hydrostatic machine (P and also comprising an adjusting piston (9), which is displaceable in a sealing-tight manner in a control cylinder (6), can be loaded and unloaded with control pressure and supports a valve element (10) movable against a valve seat (11) in a leakproof sealing-tight manner upon the application of pressure to release or interrupt the connection between the two terminals (A, B).
    b) a two-way valve (WV), which is connected via a control line (1, 2) in each case to each of the two terminals (A, B) of the shutoff valve (C) and via a supply line (15) to the control cylinder (6) of the shutoff valve (C) in such a manner that said supply line (15) is connected in each case with the terminal (A, B) in which the higher pressure exists, and
    c) a leakproof remote control valve (W), which is arranged in the supply line (15) leading from the two-way valve (WV) to the control cylinder (6) of the shutoff valve (C), is designed as changeover seat valve with an electromagnetic actuating device and which in its first position disconnects the supply line (15) between the two-way valve (WV) and the control cylinder (6) and for the flow connection of the shutoff valve (C) discharges said supply line (15) via a relief line (14) to a tank terminal (T) and in its second position allows the control pressure existing in the supply line (15) to flow to the control cylinder (6) in order to close the shutoff valve (C),


    the shutoff valve (C), the two-way valve (WV), the hydraulic parts of the control valve (W) and optionally further elements as well as the respective connecting lines combining to form a common block (5), characterised in that the following further elements are provided in the common block (5):
    - a pressure relief valve (DB), which opens once a maximum permissible pressure is reached and is connected between the relief line (14) leading to the tank terminal (T) and the line (3) connected to the pressure store terminal (S),the terminal (B) of the shutoff valve (C) and connected with the pressure store (S),
    - a throttle (DR') in the supply line (15) between the control valve (W) and the control cylinder (6) of the shutoff valve (C),
    - a throttle (DR") in the relief line (14) leading from the control valve (W) to the tank terminal (T), and
    - a shutoff throttle (D) between said relief line (14) and said line (3), by means of which (D) the pressure store (S) can be discharged into the tank when necessary.
  2. A valve arrangement according to claim 1, characterised in that a pressure measuring point for a pressure signal transmitter (M', M") is arranged at the two terminals (A, B) of the shutoff valve (C), or in the lines (2, 3, or 1, 4) connected to the terminals (A, B).
EP86114822A 1986-01-27 1986-10-24 Valve arrangement for hydraulic accumulator Expired - Lifetime EP0230529B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114822T ATE72693T1 (en) 1986-01-27 1986-10-24 VALVE ASSEMBLY FOR A HYDRAULIC ACCUMULATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863602362 DE3602362A1 (en) 1986-01-27 1986-01-27 VALVE ARRANGEMENT FOR A HYDRAULIC PRESSURE STORAGE
DE3602362 1986-01-27

Publications (3)

Publication Number Publication Date
EP0230529A2 EP0230529A2 (en) 1987-08-05
EP0230529A3 EP0230529A3 (en) 1989-04-26
EP0230529B1 true EP0230529B1 (en) 1992-02-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114822A Expired - Lifetime EP0230529B1 (en) 1986-01-27 1986-10-24 Valve arrangement for hydraulic accumulator

Country Status (5)

Country Link
US (1) US4706930A (en)
EP (1) EP0230529B1 (en)
AT (1) ATE72693T1 (en)
DE (2) DE3602362A1 (en)
DK (1) DK166551B1 (en)

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DE3683933D1 (en) 1992-03-26
US4706930A (en) 1987-11-17
DK578386D0 (en) 1986-12-02
EP0230529A2 (en) 1987-08-05
ATE72693T1 (en) 1992-03-15
DK578386A (en) 1987-07-28
DK166551B1 (en) 1993-06-07
DE3602362A1 (en) 1987-07-30
EP0230529A3 (en) 1989-04-26

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