EP1369596A2 - Hydraulic valve arrangement - Google Patents

Hydraulic valve arrangement Download PDF

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Publication number
EP1369596A2
EP1369596A2 EP20030076582 EP03076582A EP1369596A2 EP 1369596 A2 EP1369596 A2 EP 1369596A2 EP 20030076582 EP20030076582 EP 20030076582 EP 03076582 A EP03076582 A EP 03076582A EP 1369596 A2 EP1369596 A2 EP 1369596A2
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EP
European Patent Office
Prior art keywords
valve
tappet
pressure
connection
arrangement according
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
EP20030076582
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German (de)
French (fr)
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EP1369596B1 (en
EP1369596A3 (en
Inventor
Martin Raadkjaer Joergensen
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Danfoss Power Solutions ApS
Original Assignee
Sauer Danfoss ApS
Sauer Danfoss Nordborg ApS
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Application filed by Sauer Danfoss ApS, Sauer Danfoss Nordborg ApS filed Critical Sauer Danfoss ApS
Publication of EP1369596A2 publication Critical patent/EP1369596A2/en
Publication of EP1369596A3 publication Critical patent/EP1369596A3/en
Application granted granted Critical
Publication of EP1369596B1 publication Critical patent/EP1369596B1/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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • 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
    • F15B11/003—Systems with load-holding valves
    • 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
    • Y10T137/87233—Biased exhaust valve
    • Y10T137/87241—Biased closed

Definitions

  • the invention relates to a hydraulic valve arrangement with a supply connection arrangement, the one Has high pressure connection and a low pressure connection, a working connection arrangement, the two working connections has a control valve between the supply connection arrangement and the working connection arrangement is arranged, and a check valve for every working connection between the control valve and the respective work connection is arranged and its valve element mechanically using a Tappet is controllable.
  • Such a hydraulic valve arrangement is from DE 40 28 887 A1 known.
  • There the plunger opens of the respective check valve on an inclined surface on Control valve slide actuated.
  • Through the opening of the check valve is a return of the engine in one undeflected or extended condition too possible if only a small load on the motor acts, for example the dead weight, and this load is so low that it is used to open the check valve necessary pressure via any auxiliary valves can't muster.
  • a hydraulic valve arrangement with check valves is mainly for mounting on tractors or others Machines thought.
  • the check valves should ensure that the behavior is as leakproof as possible, i.e. they are to be connected to the working connection arrangement Hold the motor in a certain position, if this is set by the control valve.
  • the Check valves are opened with the help of a pilot pressure. This is for example from DE 199 31 142 A1 or 199 19 015 A1. However, this requires that the engine has sufficient pilot pressure can generate.
  • valve arrangement must therefore be able both for double-acting motors and for single-acting motors to open the check valves. If, for example, the field rail on a tractor is controlled via the valve arrangement on the Field rail but no weight rests, then there is hardly any a load to lower the farm rail. The pressure in the tank line should be almost 0 bar, which in is usually relatively difficult to implement.
  • DE 40 28 887 A1 therefore has a positive opening of the Check valves provided. If the spool of the control valve is moved in one direction, then it poses on the one hand the necessary hydraulic connections to operate the motor in one direction. At the same time, the check valve is over the plunger and opened the slide to drain the liquid from the opposite pressure chamber of the engine enable.
  • the invention has for its object when in use of a single-acting motor that of supply reliably open the check valve can.
  • the pressure chamber of the plunger for a check valve is limited by the valve element of the other check valve.
  • the slide of the control valve or a corresponding valve element
  • the valve arrangement with a motor to operate, which is arranged on both work ports or with an engine running on only one Work connection is arranged and accordingly one-sided acts.
  • the free work connection must be with this Design can only be closed. If now with the help of the control valve the pressure to itself closed work connection, then there the check valve turned open. The pestle will moved accordingly to the check valve on the other Tax on the work connection.
  • the opening of the check valve at the closed work connection is not critical, because the hydraulic fluid does not escape anyway can, regardless of whether the check valve is open is or not.
  • a common plunger is provided for both check valves.
  • the plunger can then do one or the other Open the shut-off valve when the pressure on the other Check valve is present.
  • the use of a single Tappet simplifies the construction. You have beyond that the advantage that the one-way motor in Connect basically to each of the two working connections can without the function of the valve assembly is adversely affected.
  • the plunger is preferably shorter than the distance between the valve elements of the two check valves. In an operating mode in which both work connections with connected to the motor, the plunger does not interfere. It may be so charged that it is a Check valve opens when the other check valve goes through the pressure at the high pressure connection is opened, which is caused by the control valve is directed there. In this case is the opening of the other check valve anyway required. If the ram is shorter than the distance between the valve elements of the two check valves, there is definitely a position in which he both check valves not acted on.
  • the valve element and / or the At least on their common contact surface a shape on that the penetration of liquid allowed between the plunger and the valve element.
  • the plunger can, moreover, be relative be thin.
  • the force acting on the plunger only has to sufficient to overcome a force that, for example from a closing spring to the valve element of the check valve is exercised.
  • Such Forming can for example be a groove that in the surface of the valve element of the check valve is arranged is. It can also have a projection on the front of the pestle. Other configurations are conceivable and easily findable for the expert.
  • the tappet and the valve elements of the two check valves preferably have a common axis of movement.
  • the tappet and the two valve elements thus move along a straight line. This keeps wear down.
  • the ram is only loaded along its direction of movement.
  • the guidance of the tappet in the housing is therefore not burdened by laterally acting forces.
  • the pressure chamber can preferably be connected to a leakage oil discharge device.
  • the tappet will have no influence on the valve function.
  • the leakage oil discharge device is provided, via which a correspondingly excessive amount of hydraulic fluid can be discharged before the pressure becomes too great.
  • the leak oil discharge device ensures that a leak cannot lead to pressure build-up at the work connections.
  • the leak oil discharge device has an orifice that connects to the low pressure connection forms.
  • the cover prevents that if there is a desired increase in pressure in the corresponding Too much hydraulic fluid is draining from the pressure chamber can.
  • the panel is preferably in a load sensing line arranged in the neutral position of the control valve is connected to the low pressure connection. This is a relatively simple design.
  • the load sensing line is connected to the work connections anyway. This is required to be the highest in the system occurring pressure to the pump or an associated Report control device. You can now do this Give the load sensor line a second function. she serves namely, smaller amounts of leakage of hydraulic fluid dissipate.
  • the valve element is preferably both mechanical can be controlled hydraulically with the tappet.
  • the Hydraulic valve opening is typical at high pressures, for example 10 bar to 400 bar, and large flow rates, whereas the mechanical solution at lower pressures, e.g. between 0 and 10 bar and small flow rates used becomes.
  • a hydraulic valve arrangement 1 has a housing 2 on.
  • Two working connections A, B are provided in the housing 2, which together form a working connection arrangement form.
  • a control valve 3 is arranged, which has a slide 4, only shown schematically, the in a bore 5 in the housing 2 under the Effect of a drive 6 is displaceable.
  • the hole 5 has a series of circumferential grooves 7-13.
  • the Slider 4 has a series of circumferential grooves 14-19. By moving the slide 4, the Position circumferential grooves 14-19 so that certain neighboring ones Circumferential grooves 7-13 in the bore 5 with each other get connected.
  • the representation of the slide 4 with its grooves 14-19 is therefore not to scale. But since the formation of such a control valve 3rd known with a slider 4 in a bore a detailed explanation is dispensed with.
  • the circumferential groove 7 is connected to the outlet via a channel 20 a compensation valve 21 in connection.
  • the Input of the compensation valve 21 is with the high pressure connection P connected.
  • the compensation valve 21, also known as a pressure compensator or pressure regulator ensures that the control valve 3 there is always the same pressure drop.
  • the control valve 3 is on a first working line 22 with the working connection A in connection and via a second working line 23 with the working connection B.
  • a first check valve 24 arranged, which has a valve element 25, that by a compression spring 26 in contact with one Valve seat 27 is held.
  • the check valve 24 is controllable by a pressure in the working line 22 prevails. The prerequisite for this is that the Pressure in the working line 22 is so great that it Force of the compression spring 26 overcomes.
  • valve element 29th has, by a compression spring 30 against a valve seat 31 is pressed.
  • the valve element 29 can from Valve seat 31 can be lifted when the pressure in the second working line 23 is large enough.
  • the pressure in the two working lines 22, 23 is by the Slider 4 of the control valve 3 controlled.
  • the other work port B is closed. This is symbolized by a check valve 35.
  • a plunger 36 arranged in a bore 37 is displaceable in the housing.
  • the axis of the hole and thus also the axis of the plunger 36 is correct coincides with the axis 48 of the valve elements 25, 29 of the Check valves 24, 28.
  • the working line 22 has one in front of the check valve 24 first pressure chamber 38.
  • the pressure in the first pressure room 38 controls the opening movement of the valve element 25 of the first check valve 24.
  • the pressure in the pressure chamber 39 controls the opening movement of the valve element 29 of the second Check valve 28.
  • the plunger 36 now ends in the two pressure chambers 38, 39.
  • the plunger 36 is pressed by the pressure in the two Pressurized spaces 38, 39. If the pressure in the second pressure chamber 39 is greater than the pressure in the first Pressure chamber 38, then the plunger 36 in the direction of the valve element 25 of the first check valve 24 shifted. If the pressure in the second pressure chamber 39 is sufficient, to generate a force greater than the force exerted by the compression spring 26 on the valve element 25 of the first check valve 24, then the Tappet 36 is able to remove valve element 25 from the valve seat 27 take off and a connection accordingly from the work connection A to the first work line 22 release.
  • the slide 4 of the control valve 3 is moved that the channel 20 is connected by the compensation valve 21 becomes 23 with the second management a pressure builds up in the second pressure chamber 39, the plunger 36 in the direction of the valve element 25 of the first check valve 24 moves in the drawing So to the left, and the valve element 25 from the valve seat 27 stands out against the force of the compression spring 26.
  • the slide 4 has a connection between the first working line 22 and not closer Low pressure connection shown, for example can be connected to the two grooves 10, 11, so that the hydraulic fluid from the pressure chamber 33 of the motor 32 can flow off.
  • the plunger 36 is in the rest position shown on the valve element 29 of the second shutoff valve 28.
  • a formation 40 in the present case Fall a groove in its surface.
  • This formation 40 doesn't have to be big. It only has to suffice to to exert sufficient pressure on the plunger 36 to lift the plunger 36 from the valve element 29. After that the entire end face of the plunger 36 stands for one Pressurization available.
  • the length of the plunger 36 is shorter than the distance between the two valve elements 25, 29. In the rest position it is entirely possible and also envisaged that the two check valves 24, 28 are closed are.
  • connection arrangement for example a double-acting motor on the two working connections A, B is connected, then the Tappet 36 capable of blocking valve 24, 28, respectively to open, in the pressure chamber 38, 39 not enough There is pressure to open it.
  • the Tappet 36 capable of blocking valve 24, 28, respectively to open, in the pressure chamber 38, 39 not enough
  • the Tappet 36 capable of blocking valve 24, 28, respectively to open, in the pressure chamber 38, 39 not enough
  • the Working port A should be pressurized, then there is a corresponding pressure in the first work management 22 under the control of the slide 4 of the Control valve 3 on. This pressure is able to do that Open check valve 24.
  • the plunger 36 moved to the right and opens the second shut-off valve 28, so that liquid from the working connection B can flow off via the working line 23.
  • valve arrangement 1 is therefore without further conversion measures both usable if one-way Motor is connected as well, if one double-acting motor is connected.
  • the plunger 36 In normal operation, the plunger 36 has no influence have the valve function. However, to completely oppose it to ensure that there is no pressure inadvertently the work lines 22, 23 or the work connections A, B can build that open the check valves 24, 28 the working connections A, B are via lines 41, 42 connected to a load-sensing connection LS. Indeed is an aperture 43, 44 for in this connection each working port A, B provided. About these panels 43, 44 may be a leakage fluid in the Neutral position of the slide 4 in the housing 2 in a or both of the working lines 22, 23 arrive. The LS line is in the neutral position of the Slider 4 connected to the low pressure connection.

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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)
  • Valve Device For Special Equipments (AREA)
  • Multiple-Way Valves (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Hydraulic valve arrangement (1) comprises a supply connection arrangement having a high pressure connection (P) and a low pressure connection, a working connection arrangement having two working connections (A, B), a control valve (3) arranged between the supply connection arrangement and the working connection arrangement, and a shut-off valve (24, 28) for each working connection which is arranged between the control valve and the working connection and has a valve element (25, 29) that is mechanically controlled with the aid of a tappet (36). The tappet ends on its side facing away from the valve element in a pressurized pressure chamber. Preferred Features: The pressure chamber of the tappet for one shut-off valve is defined by the valve element of the other shut-off valve. Both shut-off valves are provided with a common tappet. The tappet is shorter than the distance between the valve elements of the two shut-off valves.

Description

Die Erfindung betrifft eine hydraulische Ventilanordnung mit einer Versorgungsanschlußanordnung, die einen Hochdruckanschluß und einen Niederdruckanschluß aufweist, einer Arbeitsanschlußanordnung, die zwei Arbeitsanschlüsse aufweist, einem Steuerventil, das zwischen der Versorgungsanschlußanordnung und der Arbeitsanschlußanordnung angeordnet ist, und einem Sperrventil für jeden Arbeitsanschluß, das zwischen dem Steuerventil und dem jeweiligen Arbeitsanschluß angeordnet ist und dessen Ventilelement mechanisch mit Hilfe eines Stößels aufsteuerbar ist.The invention relates to a hydraulic valve arrangement with a supply connection arrangement, the one Has high pressure connection and a low pressure connection, a working connection arrangement, the two working connections has a control valve between the supply connection arrangement and the working connection arrangement is arranged, and a check valve for every working connection between the control valve and the respective work connection is arranged and its valve element mechanically using a Tappet is controllable.

Eine derartige hydraulische Ventilanordnung ist aus DE 40 28 887 A1 bekannt. Dort wird der Stößel zum Öffnen des jeweiligen Sperrventils über eine Schrägfläche am Schieber des Steuerventils betätigt. Durch die Öffnung des Sperrventils wird ein Rückführen des Motors in einen nicht ausgelenkten oder ausgefahrenen Zustand auch dann möglich, wenn auf den Motor nur eine kleine Last wirkt, beispielsweise das Eigengewicht, und diese Last so gering ist, daß sie den zum Aufsteuern des Sperrventils über irgendwelche Hilfsventile notwendigen Druck nicht aufbringen kann.Such a hydraulic valve arrangement is from DE 40 28 887 A1 known. There the plunger opens of the respective check valve on an inclined surface on Control valve slide actuated. Through the opening of the check valve is a return of the engine in one undeflected or extended condition too possible if only a small load on the motor acts, for example the dead weight, and this load is so low that it is used to open the check valve necessary pressure via any auxiliary valves can't muster.

Eine hydraulische Ventilanordnung mit Sperrventilen ist hauptsächlich für die Montage auf Traktoren oder anderen Arbeitsmaschinen gedacht. Die Sperrventile sollen dabei für ein möglichst tropfdichtes Verhalten sorgen, d.h. sie sollen den an die Arbeitsanschlußanordnung angeschlossenen Motor in einer bestimmten Position halten, wenn dies vom Steuerventil so eingestellt ist. Die Sperrventile werden mit Hilfe eines Pilotdrucks geöffnet. Dies geht beispielsweise aus DE 199 31 142 A1 oder 199 19 015 A1 hervor. Allerdings ist es hierfür erforderlich, daß der Motor einen ausreichenden Pilotdruck erzeugen kann.A hydraulic valve arrangement with check valves is mainly for mounting on tractors or others Machines thought. The check valves should ensure that the behavior is as leakproof as possible, i.e. they are to be connected to the working connection arrangement Hold the motor in a certain position, if this is set by the control valve. The Check valves are opened with the help of a pilot pressure. This is for example from DE 199 31 142 A1 or 199 19 015 A1. However, this requires that the engine has sufficient pilot pressure can generate.

Bei doppelt wirkenden Motoren (oder anderen Verbrauchern) ist dies in der Regel kein Problem, weil der Motor dann, wenn er durch den Druck an einem Arbeitsanschluß in eine Richtung bewegt wird, automatisch einen entsprechend großen Druck am anderen Arbeitsanschluß erzeugt, der dann wiederum die Sperrventile öffnen kann. Bei einfach wirkenden Motoren trifft dies nicht zu. Da nur auf der einen Seite des Motors Flüssigkeit vorhanden ist, kann er nur in eine Richtung aktiviert werden. Um wieder in eine Ausgangsstellung zurückkehren zu können, muß er in die entgegengesetzte Richtung von einer Last beeinflußt werden.With double-acting motors (or other consumers) this is usually not a problem because of the engine then when he is pressed by a work connection is moved in one direction, automatically one correspondingly large pressure at the other work connection generated, which then in turn open the check valves can. This applies to single-acting motors not to. Because liquid is only on one side of the motor is present, it can only be activated in one direction become. To return to a starting position to be able to do so, he must be in the opposite direction Direction can be influenced by a load.

Man weiß im vorhinein im Grunde nie sicher, welcher Verbraucher an die Ventilanordnung angeschlossen werden soll. Die Ventilanordnung muß daher in der Lage sein, sowohl bei zweiseitig wirkenden Motoren als auch bei einseitig wirkenden Motoren die Sperrventile zu öffnen. Wenn beispielsweise bei einem Traktor die Ackerschiene über die Ventilanordnung angesteuert wird, auf der Ackerschiene aber kein Gewicht ruht, dann gibt es kaum eine Last, um die Ackerschiene abzusenken. Der Druck in der Tankleitung müßte nahezu bei 0 bar liegen, was in der Regel relativ schwierig zu realisieren ist.You never really know which one in advance Consumers can be connected to the valve arrangement should. The valve arrangement must therefore be able both for double-acting motors and for single-acting motors to open the check valves. If, for example, the field rail on a tractor is controlled via the valve arrangement on the Field rail but no weight rests, then there is hardly any a load to lower the farm rail. The pressure in the tank line should be almost 0 bar, which in is usually relatively difficult to implement.

Man hat daher in DE 40 28 887 A1 eine Zwangsöffnung der Sperrventile vorgesehen. Wenn der Schieber des Steuerventils in eine Richtung bewegt wird, dann stellt er zum einen die notwendigen hydraulischen Verbindungen her, um den Motor in eine Richtung betreiben zu können. Gleichzeitig wird das Sperrventil über den Stößel und den Schieber geöffnet, um ein Ablaufen der Flüssigkeit aus der gegenüberliegenden Druckkammer des Motors zu ermöglichen.DE 40 28 887 A1 therefore has a positive opening of the Check valves provided. If the spool of the control valve is moved in one direction, then it poses on the one hand the necessary hydraulic connections to operate the motor in one direction. At the same time, the check valve is over the plunger and opened the slide to drain the liquid from the opposite pressure chamber of the engine enable.

Diese Ausbildung hat jedoch einige Nachteile. Zum einen wird eine relativ große Reibung zwischen dem Schieber des Steuerventils und dem Stößel des Sperrventils erzeugt, was beispielsweise dann von Nachteil ist, wenn der Schieber elektrisch betätigt werden soll. Darüber hinaus ist bei dieser Ausgestaltung ein teilweise erheblicher Verschleiß zu beobachten, der die Gefahr mit sich bringt, daß die Ventilanordnung auf Dauer funktionsunfähig wird.However, this training has some disadvantages. On the one hand there is a relatively large amount of friction between the slider of the control valve and the tappet of the check valve, which is a disadvantage, for example, if the slide is to be operated electrically. About that in addition, this configuration is a considerable one in some cases Watch the wear with the danger brings that the valve assembly inoperable in the long run becomes.

Der Erfindung liegt die Aufgabe zugrunde, bei Verwendung eines nur einseitig wirkenden Motors das der Versorgung dienende Sperrventil zuverlässig aufsteuern zu können.The invention has for its object when in use of a single-acting motor that of supply reliably open the check valve can.

Diese Aufgabe wird bei einer hydraulischen Ventilanordnung der eingangs genannten Art dadurch gelöst, daß der Stößel auf seiner dem Ventilelement abgewandten Seite in einem Druckraum endet, der mit Druck beaufschlagbar ist.This task is accomplished with a hydraulic valve assembly of the type mentioned in that the Tappet on its side facing away from the valve element ends in a pressure chamber that can be pressurized is.

Durch die Druckbeaufschlagung des Druckraumes wird der Stößel bewegt und steuert dadurch das Ventilelement des Sperrventils auf. Dieses Aufsteuern benötigt also keine Umlenkung von mechanisch wirkenden Kräften mehr. Die Beaufschlagung des Stößels erfolgt hydraulisch. Hydraulische Drücke können aber weitgehend verschleißfrei auf den Stößel wirken. Dementsprechend wird der Verschleiß klein gehalten und das Sperrventil kann auch auf Dauer zuverlässig aufgesteuert werden. Die Erzeugung eines Drucks auf den Stößel ist vergleichsweise einfach. Ein erhöhter Druck steht im System ohnehin zur Verfügung. Man muß diesen Druck nur mit geeigneten Maßnahmen auf die entsprechende Stirnseite des Stößels leiten.By pressurizing the pressure chamber The tappet moves and controls the valve element of the Check valve. This control is therefore not required Redirection of mechanical forces more. The The ram is acted on hydraulically. hydraulic Pressures can be largely wear-free the plunger. Accordingly, the wear kept small and the check valve can also last be controlled reliably. The generation of a Pressure on the plunger is comparatively easy. On increased pressure is available in the system anyway. You only have to apply this pressure with suitable measures guide the corresponding end face of the plunger.

Hierbei ist bevorzugt, daß der Druckraum des Stößels für ein Sperrventil begrenzt ist durch das Ventilelement des jeweils anderen Sperrventils. Mit dieser Ausgestaltung erreicht man, daß der Schieber des Steuerventils (oder ein entsprechendes Ventilelement) lediglich so betätigt werden muß, daß der Druck zum zweiten Sperrventil geleitet wird, wenn das erste Sperrventil aufgesteuert werden soll. Mit dieser Ausgestaltung ist es möglich, die Ventilanordnung wahlweise mit einem Motor zu betreiben, der an beiden Arbeitsanschlüssen angeordnet ist, oder mit einem Motor, der an nur einem Arbeitsanschluß angeordnet ist und dementsprechend einseitig wirkt. Der freie Arbeitsanschluß muß bei dieser Ausgestaltung lediglich verschlossen werden. Wenn man nun mit Hilfe des Steuerventils den Druck zum an sich verschlossenen Arbeitsanschluß leitet, dann wird dort zwar das Sperrventil aufgesteuert. Der Stößel wird aber entsprechend bewegt, um auch das Sperrventil am anderen Arbeitsanschluß aufzusteuern. Das Aufsteuern des Sperrventils am verschlossenen Arbeitsanschluß ist unkritisch, weil die Hydraulikflüssigkeit ohnehin nicht entweichen kann, unabhängig davon, ob das Sperrventil geöffnet ist oder nicht.It is preferred that the pressure chamber of the plunger for a check valve is limited by the valve element of the other check valve. With this configuration one reaches that the slide of the control valve (or a corresponding valve element) only must be operated so that the pressure to the second Check valve is routed when the first check valve to be controlled. With this configuration is it is possible to choose the valve arrangement with a motor to operate, which is arranged on both work ports or with an engine running on only one Work connection is arranged and accordingly one-sided acts. The free work connection must be with this Design can only be closed. If now with the help of the control valve the pressure to itself closed work connection, then there the check valve turned open. The pestle will moved accordingly to the check valve on the other Tax on the work connection. The opening of the check valve at the closed work connection is not critical, because the hydraulic fluid does not escape anyway can, regardless of whether the check valve is open is or not.

Hierbei ist besonders bevorzugt, daß für beide Sperrventile ein gemeinsamer Stößel vorgesehen ist. Der Stößel kann dann sowohl das eine als auch das andere Sperrventil öffnen, wenn der Druck am jeweils anderen Sperrventil anliegt. Die Verwendung eines einzelnen Stößels vereinfacht den Aufbau. Man hat darüber hinaus den Vorteil, daß man den einseitig wirkenden Motor im Grunde an jedem der beiden Arbeitsanschlüsse anschließen kann, ohne daß die Funktion der Ventilanordnung negativ beeinflußt wird.It is particularly preferred that for both check valves a common plunger is provided. The The plunger can then do one or the other Open the shut-off valve when the pressure on the other Check valve is present. The use of a single Tappet simplifies the construction. You have beyond that the advantage that the one-way motor in Connect basically to each of the two working connections can without the function of the valve assembly is adversely affected.

Vorzugsweise ist der Stößel kürzer als der Abstand zwischen den Ventilelementen der beiden Sperrventile. In einer Betriebsweise, in der beide Arbeitsanschlüsse mit dem Motor verbunden sind, stört der Stößel dann nicht. Er ist zwar möglicherweise so beaufschlagt, daß er ein Sperrventil öffnet, wenn das andere Sperrventil durch den Druck am Hochdruckanschluß geöffnet wird, der durch das Steuerventil dorthin geleitet wird. In diesem Fall ist das Öffnen des anderen Sperrventils aber ohnehin erforderlich. Wenn der Stößel kürzer ist als der Abstand zwischen den Ventilelementen der beiden Sperrventile, gibt es auf jeden Fall eine Stellung, in der er beide Sperrventile nicht beaufschlagt.The plunger is preferably shorter than the distance between the valve elements of the two check valves. In an operating mode in which both work connections with connected to the motor, the plunger does not interfere. It may be so charged that it is a Check valve opens when the other check valve goes through the pressure at the high pressure connection is opened, which is caused by the control valve is directed there. In this case is the opening of the other check valve anyway required. If the ram is shorter than the distance between the valve elements of the two check valves, there is definitely a position in which he both check valves not acted on.

Bevorzugterweise weisen das Ventilelement und/oder der Stößel an ihrer gemeinsamen Berührungsfläche mindestens eine Ausformung auf, die das Vordringen von Flüssigkeit zwischen den Stößel und das Ventilelement erlaubt. Damit ist sichergestellt, daß der Druck auch auf die entsprechende Stirnseite des Stößels wirken kann, um den Stößel zu verlagern. Der Stößel kann im übrigen relativ dünn sein. Die auf den Stößel wirkende Kraft muß lediglich ausreichen, um eine Kraft zu überwinden, die beispielsweise von einer Schließfeder auf das Ventilelement des Sperrventils ausgeübt wird. Eine derartige Ausformung kann beispielsweise eine Nut sein, die in der Oberfläche des Ventilelements des Sperrventils angeordnet ist. Sie kann auch ein Vorsprung an der Stirnseite des Stößels sein. Andere Ausgestaltungen sind denkbar und für den Fachmann ohne weiteres auffindbar.Preferably, the valve element and / or the At least on their common contact surface a shape on that the penetration of liquid allowed between the plunger and the valve element. In order to ensures that the pressure is also on the corresponding Front of the plunger can act around the Relocate ram. The plunger can, moreover, be relative be thin. The force acting on the plunger only has to sufficient to overcome a force that, for example from a closing spring to the valve element of the check valve is exercised. Such Forming can for example be a groove that in the surface of the valve element of the check valve is arranged is. It can also have a projection on the front of the pestle. Other configurations are conceivable and easily findable for the expert.

Vorzugsweise weisen der Stößel und die Ventilelemente der beiden Sperrventile eine gemeinsame Bewegungsachse auf. Der Stößel und die beiden Ventilelemente bewegen sich also entlang einer geraden Linie. Dies hält den Verschleiß klein. Der Stößel wird nur entlang seiner Bewegungsrichtung belastet. Die Führung des Stößels im Gehäuse wird also nicht durch seitlich wirkende Kräfte belastet.
Vorzugsweise ist der Druckraum mit einer Leckölabführeinrichtung verbindbar. Im Normalbetrieb wird der Stößel keinen Einfluß auf die Ventilfunktion haben. Um jedoch vollständig sicherzustellen, daß nicht unabsichtlich ein Druck an den Arbeitsanschlüssen aufgebaut werden kann, der dann wieder den Stößel beeinflußt, ist die Leckölabführeinrichtung vorgesehen, über die eine entsprechend überschüssige Menge an Hydraulikflüssigkeit abgeführt werden kann, bevor der Druck zu groß wird. Wenn das Steuerventil in der Neutralstellung ist, dann sorgt die Leckölabführeinrichtung dafür, daß eine Leckage nicht zu einem Druckaufbau an den Arbeitsanschlüssen führen kann.The tappet and the valve elements of the two check valves preferably have a common axis of movement. The tappet and the two valve elements thus move along a straight line. This keeps wear down. The ram is only loaded along its direction of movement. The guidance of the tappet in the housing is therefore not burdened by laterally acting forces.
The pressure chamber can preferably be connected to a leakage oil discharge device. In normal operation, the tappet will have no influence on the valve function. However, in order to completely ensure that a pressure cannot accidentally build up on the work connections, which then again influences the plunger, the leakage oil discharge device is provided, via which a correspondingly excessive amount of hydraulic fluid can be discharged before the pressure becomes too great. When the control valve is in the neutral position, the leak oil discharge device ensures that a leak cannot lead to pressure build-up at the work connections.

Hierbei ist bevorzugt, daß die Leckölabführeinrichtung eine Blende aufweist, die eine Verbindung zum Niederdruckanschluß bildet. Durch die Blende wird verhindert, daß bei einem gewollten Druckanstieg in dem entsprechenden Druckraum zu viel hydraulische Flüssigkeit abfließen kann.It is preferred that the leak oil discharge device has an orifice that connects to the low pressure connection forms. The cover prevents that if there is a desired increase in pressure in the corresponding Too much hydraulic fluid is draining from the pressure chamber can.

Vorzugsweise ist die Blende in einer Lastfühlleitung angeordnet, die in Neutralstellung des Steuerventils mit dem Niederdruckanschluß verbunden ist. Dies ist eine relativ einfache Ausgestaltung. Die Lastfühlleitung ist ohnehin mit den Arbeitsanschlüssen verbunden. Dies ist erforderlich, um den jeweils höchsten im System vorkommenden Druck an die Pumpe oder eine damit verbundene Steuereinrichtung zu melden. Man kann nun dieser Lastfühlleitung eine zweite Funktion mitgeben. Sie dient nämlich dazu, kleinere Leckagemengen von Hydraulikflüssigkeit abzuführen.The panel is preferably in a load sensing line arranged in the neutral position of the control valve is connected to the low pressure connection. this is a relatively simple design. The load sensing line is connected to the work connections anyway. This is required to be the highest in the system occurring pressure to the pump or an associated Report control device. You can now do this Give the load sensor line a second function. she serves namely, smaller amounts of leakage of hydraulic fluid dissipate.

Vorzugsweise ist das Ventilelement sowohl mechanisch mit dem Stößel als auch hydraulisch aufsteuerbar. Die hydraulische Öffnung der Ventile wird typischerweise bei großen Drücken, beispielsweise 10 bar bis 400 bar, und großen Durchflußmengen verwendet, wo hingegen die mechanische Lösung bei kleineren Drücken, z.B. zwischen 0 und 10 bar und kleinen Durchflußmengen verwendet wird.The valve element is preferably both mechanical can be controlled hydraulically with the tappet. The Hydraulic valve opening is typical at high pressures, for example 10 bar to 400 bar, and large flow rates, whereas the mechanical solution at lower pressures, e.g. between 0 and 10 bar and small flow rates used becomes.

Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung näher beschrieben. Hierin zeigt die

einzige Fig.
einen schematischen Querschnitt durch eine hydraulische Ventilanordnung.
The invention is described below with reference to a preferred embodiment in connection with the drawing. Here shows the
only fig.
a schematic cross section through a hydraulic valve assembly.

Eine hydraulische Ventilanordnung 1 weist ein Gehäuse 2 auf. Im Gehäuse 2 sind zwei Arbeitsanschlüsse A, B vorgesehen, die zusammen eine Arbeitsanschlußanordnung bilden. Ferner gibt es einen Hochdruckanschluß P und einen nicht näher dargestellten Niederdruckanschluß, die zusammen eine Versorgungsanschlußanordnung bilden. Zwischen der Arbeitsanschlußanordnung A, B und dem Versorgungsanschluß P ist ein Steuerventil 3 angeordnet, das einen nur schematisch dargestellten Schieber 4 aufweist, der in einer Bohrung 5 im Gehäuse 2 unter der Wirkung eines Antriebs 6 verschiebbar ist. Die Bohrung 5 weist eine Reihe von Umfangsnuten 7-13 auf. Der Schieber 4 weist eine Reihe von Umfangsnuten 14-19 auf. Durch eine Verschiebung des Schiebers 4 lassen sich die Umfangsnuten 14-19 so positionieren, daß bestimmte benachbarte Umfangsnuten 7-13 in der Bohrung 5 miteinander verbunden werden. Die Darstellung des Schiebers 4 mit seinen Nuten 14-19 ist insofern nicht maßstäblich. Da aber die Ausbildung eines derartigen Steuerventils 3 mit einem Schieber 4 in einer Bohrung an sich bekannt ist, wird auf eine nähere Erläuterung verzichtet.A hydraulic valve arrangement 1 has a housing 2 on. Two working connections A, B are provided in the housing 2, which together form a working connection arrangement form. There is also a high pressure connection P and a low pressure connection, not shown, which together form a supply connection arrangement. Between the working connection arrangement A, B and the supply connection P a control valve 3 is arranged, which has a slide 4, only shown schematically, the in a bore 5 in the housing 2 under the Effect of a drive 6 is displaceable. The hole 5 has a series of circumferential grooves 7-13. The Slider 4 has a series of circumferential grooves 14-19. By moving the slide 4, the Position circumferential grooves 14-19 so that certain neighboring ones Circumferential grooves 7-13 in the bore 5 with each other get connected. The representation of the slide 4 with its grooves 14-19 is therefore not to scale. But since the formation of such a control valve 3rd known with a slider 4 in a bore a detailed explanation is dispensed with.

Die Umfangsnut 7 steht über einen Kanal 20 mit dem Ausgang eines Kompensationsventils 21 in Verbindung. Der Eingang des Kompensationsventils 21 ist mit dem Hochdruckanschluß P verbunden. Das Kompensationsventil 21, das auch als Druckwaage oder Druckregler bezeichnet werden kann, stellt sicher, daß über das Steuerventil 3 immer der gleiche Druckabfall herrscht.The circumferential groove 7 is connected to the outlet via a channel 20 a compensation valve 21 in connection. The Input of the compensation valve 21 is with the high pressure connection P connected. The compensation valve 21, also known as a pressure compensator or pressure regulator ensures that the control valve 3 there is always the same pressure drop.

Das Steuerventil 3 steht über eine erste Arbeitsleitung 22 mit dem Arbeitsanschluß A in Verbindung und über eine zweite Arbeitsleitung 23 mit dem Arbeitsanschluß B. In der ersten Arbeitsleitung 22 ist ein erstes Sperrventil 24 angeordnet, das ein Ventilelement 25 aufweist, das durch eine Druckfeder 26 in Anlage an einem Ventilsitz 27 gehalten wird. Das Sperrventil 24 ist durch einen Druck aufsteuerbar, der in der Arbeitsleitung 22 herrscht. Voraussetzung dafür ist, daß der Druck in der Arbeitsleitung 22 so groß ist, daß er die Kraft der Druckfeder 26 überwindet. Natürlich gibt es mehrere unterschiedliche Möglichkeiten für die Öffnung der Ventile 24 und 28. Man kann auch einen Teil des Bereichs des Rückschlagventils auf der Lastseite mit Niederdruck (auf der Federseite) verbinden und gleichzeitig über einen Differenzbereich die restliche Federkraft mit Hilfe des Lastdrucks überwinden.The control valve 3 is on a first working line 22 with the working connection A in connection and via a second working line 23 with the working connection B. In the first working line 22 is a first check valve 24 arranged, which has a valve element 25, that by a compression spring 26 in contact with one Valve seat 27 is held. The check valve 24 is controllable by a pressure in the working line 22 prevails. The prerequisite for this is that the Pressure in the working line 22 is so great that it Force of the compression spring 26 overcomes. Of course there is several different options for opening the valves 24 and 28. One can also use part of the range the check valve on the load side with low pressure Connect (on the spring side) and at the same time the remaining spring force over a difference range overcome with the help of the load pressure.

In ähnlicher Weise ist in der Arbeitsleitung 23 ein Sperrventil 28 angeordnet, das ein Ventilelement 29 aufweist, das durch eine Druckfeder 30 gegen einen Ventilsitz 31 gedrückt wird. Das Ventilelement 29 kann vom Ventilsitz 31 abgehoben werden, wenn der Druck in der zweiten Arbeitsleitung 23 groß genug ist. Der Druck in den beiden Arbeitsleitungen 22, 23 wird durch den Schieber 4 des Steuerventils 3 gesteuert.Similarly, there is a in the working line 23 Check valve 28 arranged, the valve element 29th has, by a compression spring 30 against a valve seat 31 is pressed. The valve element 29 can from Valve seat 31 can be lifted when the pressure in the second working line 23 is large enough. The pressure in the two working lines 22, 23 is by the Slider 4 of the control valve 3 controlled.

Dargestellt ist nun eine Betriebssituation, in der lediglich am Arbeitsanschluß A ein einfach wirkender Motor 32 angeschlossen ist. Der Motor 32 weist einen Druckraum 33 auf, der von einem beweglichen Kolben 34 begrenzt ist. Wenn die Arbeitsleitung 22 durch eine entsprechende Stellung des Schiebers 4 des Steuerventils 3 unter Druck gesetzt wird, dann wird das Sperrventil 24 aufgesteuert und die Hydraulikflüssigkeit aus der Arbeitsleitung 22 kann über den Arbeitsanschluß A in den Druckraum 33 des Motors 32 fließen.An operating situation is now shown in which only a single-acting motor at working port A. 32 is connected. The motor 32 has one Pressure chamber 33 on by a movable piston 34th is limited. If the working line 22 by a corresponding position of the slide 4 of the control valve 3 is pressurized, then the check valve 24 opened and the hydraulic fluid out the working line 22 can via the working connection A flow into the pressure chamber 33 of the motor 32.

Der andere Arbeitsanschluß B ist verschlossen. Dies ist durch ein Rückschlagventil 35 symbolisiert.The other work port B is closed. This is symbolized by a check valve 35.

Eine Rückbewegung des Kolbens 34 unter Verkleinerung des Druckraums 33 ist ohne weitere Maßnahmen nicht möglich. Wenn der Druck in der Arbeitsleitung 22 absinkt, dann schließt das Sperrventil 24 und der Arbeitsanschluß A ist abgesperrt.A return movement of the piston 34 with reduction of the pressure chamber 33 is not possible without further measures. If the pressure in the working line 22 drops, then the shut-off valve 24 closes and the working connection A is locked.

Aus diesem Grunde ist zwischen den beiden Ventilelementen 25, 29 ein Stößel 36 angeordnet, der in einer Bohrung 37 im Gehäuse verschiebbar ist. Die Achse der Bohrung und damit auch die Achse des Stößels 36 stimmt überein mit der Achse 48 der Ventilelemente 25, 29 der Sperrventile 24, 28. For this reason, is between the two valve elements 25, 29 a plunger 36 arranged in a bore 37 is displaceable in the housing. The axis of the hole and thus also the axis of the plunger 36 is correct coincides with the axis 48 of the valve elements 25, 29 of the Check valves 24, 28.

Die Arbeitsleitung 22 weist vor dem Sperrventil 24 einen ersten Druckraum 38 auf. Der Druck im ersten Druckraum 38 steuert die Öffnungsbewegung des Ventilelements 25 des ersten Sperrventils 24. In ähnlicher Weise weist die zweite Arbeitsleitung 23 vor dem Sperrventil 28 einen Druckraum 39 auf. Der Druck im Druckraum 39 steuert die Öffnungsbewegung des Ventilelements 29 des zweiten Sperrventils 28.The working line 22 has one in front of the check valve 24 first pressure chamber 38. The pressure in the first pressure room 38 controls the opening movement of the valve element 25 of the first check valve 24. In a similar manner the second working line 23 upstream of the check valve 28 Pressure room 39 on. The pressure in the pressure chamber 39 controls the opening movement of the valve element 29 of the second Check valve 28.

Der Stößel 36 endet nun in den beiden Druckräumen 38, 39. Der Stößel 36 wird durch den Druck in den beiden Druckräumen 38, 39 beaufschlagt. Wenn der Druck im zweiten Druckraum 39 größer ist als der Druck im ersten Druckraum 38, dann wird der Stößel 36 in Richtung auf das Ventilelement 25 des ersten Sperrventils 24 verschoben. Wenn der Druck im zweiten Druckraum 39 ausreicht, um eine Kraft zu erzeugen, die größer ist, als die von der Druckfeder 26 ausgeübte Kraft auf das Ventilelement 25 des ersten Sperrventils 24, dann ist der Stößel 36 in der Lage, das Ventilelement 25 vom Ventilsitz 27 abzuheben und dementsprechend eine Verbindung vom Arbeitsanschluß A zur ersten Arbeitsleitung 22 freizugeben.The plunger 36 now ends in the two pressure chambers 38, 39. The plunger 36 is pressed by the pressure in the two Pressurized spaces 38, 39. If the pressure in the second pressure chamber 39 is greater than the pressure in the first Pressure chamber 38, then the plunger 36 in the direction of the valve element 25 of the first check valve 24 shifted. If the pressure in the second pressure chamber 39 is sufficient, to generate a force greater than the force exerted by the compression spring 26 on the valve element 25 of the first check valve 24, then the Tappet 36 is able to remove valve element 25 from the valve seat 27 take off and a connection accordingly from the work connection A to the first work line 22 release.

Dies kann man nun ausnutzen, um den Kolben 34 des Motors 32 abzusenken.This can now be exploited to the piston 34 of the engine 32 lower.

Der Schieber 4 des Steuerventils 3 wird so verschoben, daß der Kanal 20 vom Kompensationsventil 21 verbunden wird mit der zweiten Arbeitsleitung 23. Dementsprechend baut sich ein Druck in der zweiten Druckkammer 39 auf, der den Stößel 36 in Richtung auf das Ventilelement 25 des ersten Sperrventils 24 verschiebt, in der Zeichnung also nach links, und das Ventilelement 25 vom Ventilsitz 27 gegen die Kraft der Druckfeder 26 abhebt. Gleichzeitig hat der Schieber 4 eine Verbindung zwischen der ersten Arbeitsleitung 22 und dem nicht näher dargestellten Niederdruckanschluß, der beispielsweise mit den beiden Nuten 10, 11 verbunden sein kann, hergestellt, so daß die Hydraulikflüssigkeit aus dem Druckraum 33 des Motors 32 abfließen kann.The slide 4 of the control valve 3 is moved that the channel 20 is connected by the compensation valve 21 becomes 23 with the second management a pressure builds up in the second pressure chamber 39, the plunger 36 in the direction of the valve element 25 of the first check valve 24 moves in the drawing So to the left, and the valve element 25 from the valve seat 27 stands out against the force of the compression spring 26. At the same time, the slide 4 has a connection between the first working line 22 and not closer Low pressure connection shown, for example can be connected to the two grooves 10, 11, so that the hydraulic fluid from the pressure chamber 33 of the motor 32 can flow off.

Der Stößel 36 liegt in der dargestellten Ruhestellung am Ventilelement 29 des zweiten Sperrventils 28 an. Um sicherzustellen, daß Hydraulikflüssigkeit zwischen das Ventilelement 29 und den Stößel 36 gelangen kann, hat das Ventilelement 29 eine Ausformung 40, im vorliegenden Fall eine Nut, in seiner Oberfläche. Diese Ausformung 40 muß nicht groß sein. Sie muß nur ausreichen, um einen Druck auf den Stößel 36 auszuüben, der ausreicht, um den Stößel 36 vom Ventilelement 29 abzuheben. Danach steht die gesamte Stirnfläche des Stößels 36 für eine Druckbeaufschlagung zur Verfügung.The plunger 36 is in the rest position shown on the valve element 29 of the second shutoff valve 28. Around ensure that hydraulic fluid between the Valve element 29 and the plunger 36 can reach the valve element 29 has a formation 40, in the present case Fall a groove in its surface. This formation 40 doesn't have to be big. It only has to suffice to to exert sufficient pressure on the plunger 36 to lift the plunger 36 from the valve element 29. After that the entire end face of the plunger 36 stands for one Pressurization available.

Die Länge des Stößels 36 ist kürzer als der Abstand zwischen den beiden Ventilelementen 25, 29. In der Ruhestellung ist es also durchaus möglich und auch vorgesehen, daß die beiden Sperrventile 24, 28 geschlossen sind.The length of the plunger 36 is shorter than the distance between the two valve elements 25, 29. In the rest position it is entirely possible and also envisaged that the two check valves 24, 28 are closed are.

Wenn die Anschlußanordnung geändert wird, beispielsweise ein zweiseitig wirksamer Motor an die beiden Arbeitsanschlüsse A, B angeschlossen wird, dann ist der Stößel 36 in der Lage, jeweils das Sperrventil 24, 28 zu öffnen, in dessen Druckraum 38, 39 nicht genügend Druck anliegt, um es zu öffnen. Wenn beispielsweise der Arbeitsanschluß A unter Druck gesetzt werden soll, dann steht ein entsprechender Druck in der ersten Arbeitsleitung 22 unter der Steuerung des Schiebers 4 des Steuerventils 3 an. Dieser Druck ist in der Lage, das Sperrventil 24 zu öffnen. Gleichzeitig wird der Stößel 36 nach rechts verschoben und öffnet das zweite Sperrventil 28, so daß Flüssigkeit aus dem Arbeitsanschluß B über die Arbeitsleitung 23 abfließen kann.If the connection arrangement is changed, for example a double-acting motor on the two working connections A, B is connected, then the Tappet 36 capable of blocking valve 24, 28, respectively to open, in the pressure chamber 38, 39 not enough There is pressure to open it. For example, if the Working port A should be pressurized, then there is a corresponding pressure in the first work management 22 under the control of the slide 4 of the Control valve 3 on. This pressure is able to do that Open check valve 24. At the same time, the plunger 36 moved to the right and opens the second shut-off valve 28, so that liquid from the working connection B can flow off via the working line 23.

Die Ventilanordnung 1 ist also ohne weitere Umbaumaßnahmen sowohl verwendbar, wenn ein nur einseitig wirkender Motor angeschlossen ist, als auch, wenn ein zweiseitig wirkender Motor angeschlossen ist.The valve arrangement 1 is therefore without further conversion measures both usable if one-way Motor is connected as well, if one double-acting motor is connected.

Im Normalbetrieb wird der Stößel 36 keinen Einfluß auf die Ventilfunktion haben. Um jedoch vollständig dagegen zu sichern, daß sich nicht unbeabsichtigt ein Druck in den Arbeitsleitungen 22, 23 oder den Arbeitsanschlüssen A, B aufbauen kann, der die Sperrventile 24, 28 öffnen könnte, sind die Arbeitsanschlüsse A, B über Leitungen 41, 42 mit einem Lastfühl-Anschluß LS verbunden. Allerdings ist in dieser Verbindung eine Blende 43, 44 für jeden Arbeitsanschluß A, B vorgesehen. Über diese Blenden 43, 44 kann eine Leckageflüssigkeit, die in der Neutralstellung des Schiebers 4 im Gehäuse 2 in eine oder beide der Arbeitsleitungen 22, 23 gelangt, abfließen. Die LS-Leitung ist in der Neutralstellung des Schiebers 4 mit dem Niederdruckanschluß verbunden. In normal operation, the plunger 36 has no influence have the valve function. However, to completely oppose it to ensure that there is no pressure inadvertently the work lines 22, 23 or the work connections A, B can build that open the check valves 24, 28 the working connections A, B are via lines 41, 42 connected to a load-sensing connection LS. Indeed is an aperture 43, 44 for in this connection each working port A, B provided. About these panels 43, 44 may be a leakage fluid in the Neutral position of the slide 4 in the housing 2 in a or both of the working lines 22, 23 arrive. The LS line is in the neutral position of the Slider 4 connected to the low pressure connection.

Natürlich sind auch andere Möglichkeiten der Leckageflüssigkeit-Abfuhr möglich, sofern dabei sichergestellt ist, daß in der ausgelenkten Stellung des Schiebers 4, in der eine entsprechende Menge an Hydraulikflüssigkeit unter Druck zu einem der beiden Arbeitsanschlüsse A, B fließen soll, nicht zu viel Flüssigkeit ungenutzt abfließt.Of course, there are other ways to drain the leakage fluid possible if ensured is that in the deflected position of the slide 4, in which a corresponding amount of hydraulic fluid under pressure to one of the two working connections A, B should not flow too much liquid unused.

Claims (10)

Hydraulische Ventilanordnung mit einer Versorgungsanschlußanordnung, die einen Hochdruckanschluß und einen Niederdruckanschluß aufweist, einer Arbeitsanschlußanordnung, die zwei Arbeitsanschlüsse aufweist, einem Steuerventil, das zwischen der Versorgungsanschlußanordnung und der Arbeitsanschlußanordnung angeordnet ist, und einem Sperrventil für jeden Arbeitsanschluß, das zwischen dem Steuerventil und dem jeweiligen Arbeitsanschluß angeordnet ist und dessen Ventilelement mechanisch mit Hilfe eines Stößels aufsteuerbar ist, dadurch gekennzeichnet, daß der Stößel (36) auf seiner dem Ventilelement (25, 29) abgewandten Seite in einem Druckraum (38, 39) endet, der mit Druck beaufschlagbar ist.Hydraulic valve assembly having a supply port assembly having a high pressure port and a low pressure port, a working port assembly having two working ports, a control valve located between the supply port assembly and the working port assembly, and a check valve for each working port located between the control valve and the respective working port is arranged and the valve element can be opened mechanically with the aid of a tappet, characterized in that the tappet (36) ends on its side facing away from the valve element (25, 29) in a pressure chamber (38, 39) which can be pressurized. Ventilanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Druckraum (38, 39) des Stößels (36) für ein Sperrventil (24, 28) begrenzt ist durch das Ventilelement (29, 25) des jeweils anderen Sperrventils (28, 24).Valve arrangement according to claim 1, characterized in that the pressure chamber (38, 39) of the tappet (36) for a check valve (24, 28) is limited by the valve element (29, 25) of the other check valve (28, 24). Ventilanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß für beide Sperrventile (24, 28) ein gemeinsamer Stößel (36) vorgesehen ist.Valve arrangement according to claim 1 or 2, characterized in that a common tappet (36) is provided for both check valves (24, 28). Ventilanordnung nach Anspruch 3, dadurch gekennzeichnet, daß der Stößel (36) kürzer ist als der Abstand zwischen den Ventilelementen (25, 29) der beiden Sperrventile (24, 28).Valve arrangement according to claim 3, characterized in that the tappet (36) is shorter than the distance between the valve elements (25, 29) of the two check valves (24, 28). Ventilanordnung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Ventilelement (25, 29) und/oder der Stößel (36) an ihrer gemeinsamen Berührungsfläche mindestens eine Ausformung (40) aufweisen, die das Vordringen von Flüssigkeit zwischen den Stößel (36) und das Ventilelement (25, 29) erlaubt.Valve arrangement according to Claim 3 or 4, characterized in that the valve element (25, 29) and / or the tappet (36) have at least one shape (40) on their common contact surface which prevents the penetration of liquid between the tappets (36) and the valve element (25, 29) allows. Ventilanordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Stößel (36) und die Ventilelemente (25, 29) der beiden Sperrventile eine gemeinsame Bewegungsachse (48) aufweisen.Valve arrangement according to one of claims 1 to 5, characterized in that the tappet (36) and the valve elements (25, 29) of the two shut-off valves have a common movement axis (48). Ventilanordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Druckraum (38, 39) mit einer Leckölabführeinrichtung (41-44) verbindbar ist.Valve arrangement according to one of claims 1 to 6, characterized in that the pressure chamber (38, 39) can be connected to a leak oil discharge device (41-44). Ventilanordnung nach Anspruch 7, dadurch gekennzeichnet, daß die Leckölabführeinrichtung (41-44) eine Blende (43, 44) aufweist, die eine Verbindung zum Niederdruckanschluß bildet.Valve arrangement according to claim 7, characterized in that the leak oil discharge device (41-44) has an orifice (43, 44) which forms a connection to the low-pressure connection. Ventilanordnung nach Anspruch 8, dadurch gekennzeichnet, daß die Blende (43, 44) in einer Lastfühlleitung (LS) angeordnet ist, die in Neutralstellung des Steuerventils (3) mit dem Niederdruckanschluß verbunden ist. Valve arrangement according to claim 8, characterized in that the orifice (43, 44) is arranged in a load-sensing line (LS) which is connected to the low-pressure connection in the neutral position of the control valve (3). Ventilanordnung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Ventilelement (25, 29) sowohl mechanisch mit dem Stößel (36) als auch hydraulisch aufsteuerbar ist.Valve arrangement according to one of claims 1 to 9, characterized in that the valve element (25, 29) can be actuated both mechanically with the tappet (36) and hydraulically.
EP20030076582 2002-06-05 2003-05-26 Hydraulic valve arrangement Expired - Lifetime EP1369596B1 (en)

Applications Claiming Priority (2)

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DE2002124827 DE10224827A1 (en) 2002-06-05 2002-06-05 Hydraulic valve arrangement
DE10224827 2002-06-05

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EP1369596A2 true EP1369596A2 (en) 2003-12-10
EP1369596A3 EP1369596A3 (en) 2005-06-01
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DE102007032415B3 (en) * 2007-07-12 2009-04-02 Sauer-Danfoss Aps Hydraulic valve arrangement
EP2891806A1 (en) * 2014-01-03 2015-07-08 Danfoss Power Solutions Aps A hydraulic valve arrangement
US10590962B2 (en) * 2016-05-16 2020-03-17 Parker-Hannifin Corporation Directional control valve

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Also Published As

Publication number Publication date
EP1369596B1 (en) 2007-01-24
DE10224827A1 (en) 2004-01-08
EP1369596A3 (en) 2005-06-01
DE50306350D1 (en) 2007-03-15
US7028710B2 (en) 2006-04-18
ATE352720T1 (en) 2007-02-15
US20030226597A1 (en) 2003-12-11

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