EP2449268B1 - Valve arrangement - Google Patents
Valve arrangement Download PDFInfo
- Publication number
- EP2449268B1 EP2449268B1 EP10739848A EP10739848A EP2449268B1 EP 2449268 B1 EP2449268 B1 EP 2449268B1 EP 10739848 A EP10739848 A EP 10739848A EP 10739848 A EP10739848 A EP 10739848A EP 2449268 B1 EP2449268 B1 EP 2449268B1
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- EP
- European Patent Office
- Prior art keywords
- valve
- switching
- directional control
- tank
- directional
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- 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.)
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- 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
Definitions
- the invention relates to a valve arrangement with a pilot-operated valve according to the preamble of patent claim 1.
- Such a valve arrangement has a continuously adjustable main control valve as a main stage and an electro-magnetically actuated pilot valve as a precursor.
- the main control valve is used to control a pressure medium connection between a pressure source, a drain and a consumer in the form of a hydraulic cylinder.
- a main control spool of the main control valve is controllable via two control chambers and has a spring return.
- the control chambers for adjusting the main control piston are controlled via the pilot valve. About this the control rooms are then connected to the drain or the pressure medium source.
- the disadvantage here is that with increasing nominal size of the pilot valve and the production costs and production costs increase.
- the present invention seeks to provide a cost-effective, dynamic pilot-operated valve.
- a pilot-operated valve of a valve arrangement has a main and a preliminary stage.
- the main stage has a directional valve - for example, a seat valve - with at least one control chamber, which is connectable via a directional control valve of the preliminary stage with a pressure source or a drain or tank.
- At least one switching valve is arranged parallel to the directional control valve of the preliminary stage.
- This solution has the advantage that a high pressure medium throughput between the at least one control chamber of the main stage and the tank or the pressure medium source - depending on how the switching valve is arranged - is made possible by the switching valve.
- a high pressure medium throughput and short positioning times of the main stage can be achieved.
- a pilot valve of the precursor with a small nominal size has low manufacturing costs, high dynamics and high robustness. Since the switching valve is also extremely inexpensive, a pilot-operated valve according to the invention overall is extremely cost-effective and robust.
- the directional control valve of the preliminary stage can be a proportional directional control valve or continuous directional control valve.
- control chamber of the directional control valve of the main stage via the proportional directional control valve of the precursor with the pressure source or the tank and at least one switching valve to the tank and / or via at least one switching valve to the pressure source connected.
- this has an input and an output port.
- a pressure medium connection between the input and the output terminal is locked in a spring-biased blocking position.
- the input and the output port are in pressure medium connection (it would be conceivable to form the switch positions exactly the reverse).
- a plurality of switching valves may be arranged in the preliminary stage for connecting the control chamber to the tank.
- a plurality of switching valves may be provided.
- a switching valve has two inlet and two outlet connections. In a spring-biased basic position, the two inlet connections and the two outlet connections and in a switching position, in each case one inlet and one outlet connection are connected.
- two flow paths between the control chamber of the directional control valve of the main stage and the tank or the pressure medium source can run, at the same time low space requirement of the switching valve.
- the directional control valve of the main stage has two control chambers, via which a main control piston is proportionally adjustable via the precursor.
- a respective control chamber can be connected to the pressure source via at least one first switching valve and to the tank via at least one second switching valve.
- FIG. 1 a hydraulic circuit diagram of a valve arrangement according to the invention with a pilot-operated valve according to a first embodiment is shown.
- the valve is a 2/2-way valve 1, which serves to open and close a pressure medium connection between a hydraulic accumulator 2 and a pressure source and a consumer in the form of a hydraulic cylinder 4.
- the directional control valve 1 is used as a main stage 6, which is pre-controlled by a precursor 8.
- the hydraulic accumulator 2 is connected via a pressure line 10 to a first working port 12 of the directional control valve 1 of the main stage 6.
- a working line 16 is connected, which is connected to a cylinder chamber 18 of the hydraulic cylinder 4.
- the cylinder chamber 18 is separated by a guided in the hydraulic cylinder 4 piston 20 by an annular space 22 which is penetrated by a piston 20 connected to the piston rod 24.
- the directional control valve 1 has a valve seat 26 associated with stepped piston 28.
- a remote from the valve seat 26 control surface 30 of the stepped piston 28 defines a control chamber 32 which is connectable via the precursor 8 with the pressure line 10 and thus with the hydraulic accumulator 2 or with a tank 34.
- a closing spring 36 is arranged, which acts on the stepped piston 28 via the control surface 30 in the direction of the valve seat 26 with a spring force.
- a displacement measuring piston 38 of a displacement transducer 40 is supported for determining the stroke path of the stepped piston 28.
- the stepped piston 28 has a radially stepped-back portion 42 which rests on the valve seat 26 in the closed state of the directional control valve 1. Due to the reclassified portion 42, the stepped piston 28 has a repellent from the control surface 30 annular surface 44 and an end face 46. In the closed state of the directional control valve 1, the annular surface 44 in pressure fluid communication with the working port 12 and thus the pressure line 10 and the end face 46 with the working port 14 and thus the working line 16 connected.
- a control line 48 is connected to the control chamber 32 of the directional control valve 1, which is connected to a working port A of a directional valve 50 of the precursor 8.
- This is an electromagnetically via a proportional solenoid 52 - conceivable would be a servo or piezoelectric element - operable Proportional directional valve or 3/2-way valve.
- the directional control valve 50 further has a pressure port P, which is in fluid communication with the pressure line 10 via a connecting line 54. Via a tank connection T, the directional control valve 50 is connected to a tank line 56 connected to the tank 34.
- a pilot spool of the directional control valve 50 is biased with a valve spring 57 in a basic position a, in which the pressure port P is connected to the working port A - depending on the use, the basic position a could also be designed differently.
- About the proportional solenoid 52 of the pilot spool is displaced in the direction of working positions b, in which the working port A is connected to the tank port T.
- two switching valves 58, 60 are arranged in the preliminary stage 8 parallel to the directional control valve 50, via which a pressure medium connection between the control chamber 32 of the directional control valve 1 and the tank 34th is on and zuu Kunststoffbar.
- the switching valves 58, 60 are electromagnetically adjustable 2/2-way valves and each have a connected to the control line 48 working port A and connected to the tank line 56 tank port T.
- a valve spool of Switching valve 58 or 60 is biased by a valve spring 62 in a blocking position x, in which the pressure medium connection between the tank port T and the working port A is disconnected.
- an electromagnetically actuated actuator 64 the valve spool of the switching valve 58 or 60 can be switched to an open position y, in which the working port A is connected to the tank port T.
- the control chamber 32 is connected via the precursor 8 to the tank 34.
- the valve spool of the switching valve 58 and 60 is additionally brought into the open position y, whereby a faster discharge of the control chamber 32 to the tank 34 takes place.
- the second switching valve 58 or 60 is additionally brought into the open position y. The positioning time can thus be shortened by additional operation of one or both switching valves 58, 60.
- the directional control valve 50 and the switching valves 58 and 60 are de-energized in the normal position a or blocking position x.
- the control chamber 32 is then connected via the directional control valve 50 to the hydraulic accumulator 2, whereby the stepped piston 28 via the control surface 30 with the pressure of the hydraulic accumulator 2 and the Spring force of the closing spring 36 is moved in the closing direction against the pressure applied to the annular surface 44 and the end face 46.
- a short positioning time of the stepped piston 28 of the directional control valve 1 is required, for example, when the hydraulic cylinder 4 is used for injecting injection molding agent into an injection molding machine.
- a rapid pressurization of the piston 20 of the hydraulic cylinder 4 via the cylinder chamber 18 is necessary and thus a fast pressure medium connection between the cylinder chamber 18 connected to the working line 16 and connected to the hydraulic accumulator 2 pressure line 10 is necessary.
- FIG. 2 represents in a hydraulic circuit diagram, the valve assembly according to a second embodiment.
- the precursor 8 has two additional switching valves 66, 68. These serve to quickly close the directional control valve 1 of the main stage 6.
- the switching valves 66 and 68 each have a connected to the control line 48 working port A and connected to the connecting line 54 and thus to the pressure line 10 pressure port P.
- the further embodiment of the switching valves 66 and 68 corresponds to the one in FIG. 1 explained switching valves 58 and 60th
- the switching valves 66, 68 is a shorter positioning time of the stepped piston 28 in the closing direction, compared to the first embodiment FIG. 1 , allows.
- the switching valves 58, 60 and the directional control valve 50 of the precursor 8 are energized and the switching valve 66 energized, whereby the control chamber 32 of the directional control valve 1 of the main stage 6 via the switching valve 66 and the directional control valve 50 with the pressure line 10 and thus with the hydraulic accumulator 2 is in fluid communication.
- an increased pressure medium throughput of the hydraulic accumulator 2 is created to the control chamber 32, resulting in a shortened positioning time.
- the switching valve 68 can be actuated, whereby the pressure medium throughput is further increased.
- FIG. 3 shows a hydraulic circuit diagram of the valve assembly according to a third embodiment. This corresponds approximately to the first embodiment FIG. 1 , wherein instead of the switching valves 58, 60, a single switching valve 70 is arranged in the preliminary stage parallel to the directional control valve 50.
- the switching valve 70 is a 4/2-way valve with two working ports A1, A2 or feed ports connected to the control line 48 and two tank ports T1, T2 or drain ports connected to the tank line 56.
- a valve spool of the switching valve 70 is biased by a valve spring 72 in a basic position h, in which the two working ports A1, A2 and the two tank ports T1, T2 are in fluid communication.
- the valve slide can be switched into an open position i, in which the working port A1 is in pressure-fluid communication with the tank port T2 and the working port A2 is in fluid communication with the tank port T1.
- the pressure medium flow rate over the switching valve 70 may, for example, the sum of the two pressure medium volume flow rates of the switching valves 58 and 60 from FIG. 1 correspond, with only a single switching valve 70 is necessary and, for example, space can be saved.
- the valve slide of the switching valve 70 is actuated into the open position i in addition to the directional valve 50 connected to the working position b.
- the control line 48 is connected via the switching valve 70 on the one hand via the working port A1 and the tank port T2 and the other via the working port A2 and the tank port T1 to the tank line 56, whereby the control chamber 32 of the directional control valve 1 and the tank 34th in pressure medium connection.
- FIG. 4 is shown in a hydraulic circuit diagram, the valve assembly according to a fourth embodiment.
- This has in addition to the third embodiment FIG. 3 a switching valve 76 corresponding to the switching valve 70.
- the switching valve 76 serves to reduce the positioning time of the stepped piston 28 of the directional control valve 1 of the main stage 6 in the closing direction.
- a valve spool of the switching valve 76 is biased by a valve spring 78 in a basic position k, in which the two working ports A1, A2 and the two pressure ports P1, P2 are interconnected.
- an electromagnetically actuated actuator 80 of the valve spool of the switching valve 76 is in the open position I switchable, in which the working port A1 to the pressure port P2 and the working port A2 to the pressure port P1 is in fluid communication, whereby the pressure line 10 via the connecting line 54, the pressure ports P1, P2 and the working ports A1, A2 is connected to the control line 48 and thus to the control chamber 32 of the directional control valve 1.
- FIG. 5 apparently in a hydraulic circuit diagram, a valve assembly in a fifth embodiment.
- the main stage 6 in this case has a 4/3-way valve or continuous-way valve 82 with two control chambers 84, 86 for pressurizing and moving a main control piston 82 of the directional control valve.
- a 4/3-way valve for example, a 2/2-way or 3/2-way valve can be used.
- the control chambers 84, 86 can each be connected via the precursor 8 to the tank 34 or a pressure medium source 88.
- the pre-stage 8 has an electromagnetically continuous proportional magnets 90, 92 - is conceivable, for example, a servo or piezoelectric element or a linear motor - adjustable 4/3-way valve 94 and four parallel arranged switching valves 96, 98, 100, 102.
- the directional control valve 94th is connected via a pressure port P to a pressure line 104 connected to the pressure medium source 88. With a tank connection T, the directional control valve 94 is connected to a tank line 106 connected to the tank 34.
- a first working port A of the directional control valve 94 is connected via a first working line 108 with the in the FIG. 5 left control chamber 84 of the directional control valve 82 and a second working port B is connected via a second working line 110 to the right control chamber 86 in fluid communication.
- a valve spool of the directional control valve 94 of the precursor 8 is centered via two valve springs 112, 114 in a basic position r and by energizing the proportional solenoid 90 in the direction of working positions m, in which the working port A to the tank port T and the working port B to the pressure port P in Pressure medium connection are, displaceable. In the basic position r, both working connections to the tank connection T are in pressure medium connection.
- the valve spool of the directional control valve 94 in the direction of working positions n is displaceable, in which the working port A with the pressure port P and the working port B with the tank port T is in fluid communication.
- the directional control valve 82 of the main stage 6 has in the FIG. 5 four connections, these are not explained in detail.
- Essential in the directional control valve 82 is that the main control piston via the control chambers 84, 86 with a shortened positioning time by the switching valves 96 to 102 is displaceable.
- the switching valves 96 to 102 correspond to those of the first two embodiments FIG. 1 and 2 ,
- the switching valve 100 is connected to the working line 110 via a working port A and to the pressure line 104 via a pressure flow P.
- the switching valve 102 is connected to the working line 110 and to a tank connection T with the tank line 106.
- the right-hand control chamber 86 of the directional control valve 82 can thus be connected to the pressure medium source 88 and via the switching valve 102 to the tank 34.
- the switching valve 98 is connected via a working port A to the working line 108 and via a pressure port P to the pressure medium source 88 and the switching valve 96 via a working port A to the working line 108 and a tank port T to the tank 34.
- the left control chamber 84 of the directional control valve 82 is thus connected via the switching valve 98 with the pressure medium source 88 and with the switching valve 96 to the tank 34.
- the main control piston of the directional control valve 82 of the main stage 6 is biased via valve springs 116, 118 in a blocking position u, displaceable via the control chamber 86 in the direction of working positions w and over the control chamber 84 in the direction of working positions v.
- a displacement sensor 120 measures the displacement of the main control piston.
- the switching valves 98 and 102 are switched to blocking positions x, whereby the control chambers 84 and 86 are controlled only via the directional control valve 94 of the precursor 8. For an accurate positioning of the main control piston of the directional control valve 82 is possible.
- the control chamber 86 is correspondingly connected via the directional control valve 94 to the pressure source 88 and the control chamber 84 to the tank 34. To shorten the positioning time then the switching valve 96 and the switching valve 100 are opened.
- the switching valves from the FIGS. 1 to 5 have an extremely short switching time.
- the actuators 74 and 80 of the switching valves 70 and 76 of the Figures 3 and 4 For example, they are designed for 12 volts. In experiments it has been shown that an energization with overvoltage - for example, 24 volts - is possible, whereby advantageously the switching time of the switching valves 70 and 76 is further reduced.
- the switching valves 58, 60; 66, 68; 96, 98, 100, 102 in the FIGS. 1 . 2 and 5 can also be designed as a 3/2-way valve.
- a working port A in a first switching position with a sequence and in a second switching position with a pressure source can be connected.
- a pilot operated valve with a main and a preliminary stage.
- the main stage has a directional control valve, which is designed for example as a seat or slide valve.
- a directional control valve has at least one control chamber, which is connected via a directional control valve of the preliminary stage with a pressure source or a tank.
- a switching valve is arranged parallel to the directional control valve of the precursor. This is extremely inexpensive and robust, has a low switching time and allows an increase in the pressure medium throughput through the precursor.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Multiple-Way Valves (AREA)
- Servomotors (AREA)
- Fluid-Driven Valves (AREA)
Description
Die Erfindung geht aus von einer Ventilanordnung mit einem vorgesteuerten Ventil gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a valve arrangement with a pilot-operated valve according to the preamble of
In der
Werden schnelle Stellzeiten des Hauptsteuerkolbens des Hauptsteuerventils benötigt, so sind diese bei gegebenen Druckverhältnissen im Wesentlichen von der Nenngröße des Vorsteuerventils abhängig. Je größer die Nenngröße des Vorsteuerventils ist, desto größer ist auch der Druckmitteldurchsatz über das Vorsteuerventil zum Ansteuern der Steuerräume des Hauptsteuerventils und desto kürzer ist damit die Stellzeit.If fast positioning times of the main control piston of the main control valve are required, these are essentially dependent on the nominal size of the pilot valve at given pressure conditions. The larger the nominal size of the pilot valve, the greater the fluid flow rate through the pilot valve for driving the control chambers of the main control valve and the shorter the positioning time.
Nachteilig hierbei ist, dass mit steigender Nenngröße des Vorsteuerventils auch die Herstellungskosten und der Herstellungsaufwand steigen.The disadvantage here is that with increasing nominal size of the pilot valve and the production costs and production costs increase.
Demgegenüber liegt der Erfindung die Aufgabe zugrunde, ein kostengünstiges, dynamisches vorgesteuertes Ventil zu schaffen.In contrast, the present invention seeks to provide a cost-effective, dynamic pilot-operated valve.
Diese Aufgabe wird gelöst durch eine Ventilanordnung mit den Merkmalen des Patentanspruchs 1.This object is achieved by a valve arrangement having the features of
Erfindungsgemäß weist ein vorgesteuertes Ventil einer Ventilanordnung eine Haupt- und eine Vorstufe auf. Die Hauptstufe hat dabei ein Wegeventil - beispielsweise ein Sitzventil - mit zumindest einem Steuerraum, der über ein Wegeventil der Vorstufe mit einer Druckquelle oder einem Ablauf bzw. Tank verbindbar ist. Parallel zum Wegeventil der Vorstufe ist wenigstens ein Schaltventil angeordnet.According to the invention, a pilot-operated valve of a valve arrangement has a main and a preliminary stage. The main stage has a directional valve - for example, a seat valve - with at least one control chamber, which is connectable via a directional control valve of the preliminary stage with a pressure source or a drain or tank. At least one switching valve is arranged parallel to the directional control valve of the preliminary stage.
Diese Lösung hat den Vorteil, dass durch das Schaltventil ein hoher Druckmitteldurchsatz zwischen dem zumindest einen Steuerraum der Hauptstufe und dem Tank oder der Druckmittelquelle - je nachdem wie das Schaltventil angeordnet ist - ermöglicht ist. Dabei kann selbst bei einer kleinen Nenngröße des Wegeventils der Vorstufe ein hoher Druckmitteldurchsatz und kurze Stellzeiten der Hauptstufe erreicht werden. Ein Wegeventil der Vorstufe mit einer kleinen Nenngröße weist geringe Herstellungskosten, eine hohe Dynamik und eine hohe Robustheit auf. Da das Schaltventil ebenfalls äußerst kostengünstig ist, ist ein erfindungsgemäßes vorgesteuertes Ventil insgesamt äußerst kostengünstige und robust.This solution has the advantage that a high pressure medium throughput between the at least one control chamber of the main stage and the tank or the pressure medium source - depending on how the switching valve is arranged - is made possible by the switching valve. In this case, even with a small nominal size of the directional valve of the precursor, a high pressure medium throughput and short positioning times of the main stage can be achieved. A pilot valve of the precursor with a small nominal size has low manufacturing costs, high dynamics and high robustness. Since the switching valve is also extremely inexpensive, a pilot-operated valve according to the invention overall is extremely cost-effective and robust.
Zum genauen Ansteuern des Wegeventils der Hauptstufe kann das Wegeventil der Vorstufe ein Proportional-Wegeventil bzw. Stetig-Wegeventil sein.For accurately controlling the directional control valve of the main stage, the directional control valve of the preliminary stage can be a proportional directional control valve or continuous directional control valve.
Bei einer bevorzugten Ausgestaltung der Ventilanordnung ist der Steuerraum des Wegeventils der Hauptstufe über das Proportional-Wegeventil der Vorstufe mit der Druckquelle oder dem Tank und über zumindest ein Schaltventil mit dem Tank und/oder über zumindest ein Schaltventil mit der Druckquelle verbindbar.In a preferred embodiment of the valve assembly, the control chamber of the directional control valve of the main stage via the proportional directional control valve of the precursor with the pressure source or the tank and at least one switching valve to the tank and / or via at least one switching valve to the pressure source connected.
Bei einer sehr einfachen und kostengünstigen Ausgestaltung des Schaltventils hat dieses einen Eingangs- und einen Ausgangsanschluss. Dabei ist in einer federvorgespannten Sperrstellung eine Druckmittelverbindung zwischen dem Eingangs- und dem Ausgangsanschluss gesperrt. In einer Öffnungsstellung stehen dann der Eingangs-und der Ausgangsanschluss in Druckmittelverbindung (es wäre denkbar, die Schaltstellungen genau umgekehrt auszubilden).In a very simple and inexpensive embodiment of the switching valve, this has an input and an output port. In this case, a pressure medium connection between the input and the output terminal is locked in a spring-biased blocking position. In an open position then the input and the output port are in pressure medium connection (it would be conceivable to form the switch positions exactly the reverse).
Zur Steigerung des Druckmitteldurchsatzes zwischen dem Steuerraum des Wegeventils der Hauptstufe und dem Tank können mehrere Schaltventile in der Vorstufe zum Verbinden des Steuerraums mit dem Tank angeordnet sein.To increase the pressure medium throughput between the control chamber of the directional control valve of the main stage and the tank, a plurality of switching valves may be arranged in the preliminary stage for connecting the control chamber to the tank.
Um eine weitere Erhöhung des Druckmitteldurchsatzes zwischen dem Steuerraum des Wegeventils der Hauptstufe und der Druckquelle zu ermöglichen, können mehrere Schaltventile vorgesehen sein.In order to enable a further increase of the pressure medium throughput between the control chamber of the directional control valve of the main stage and the pressure source, a plurality of switching valves may be provided.
In einer weiteren vorteilhaften Ausgestaltung der Erfindung hat ein Schaltventil zwei Zulauf- und zwei Ablaufanschlüsse. In einer federvorgespannten Grundstellung sind die beiden Zulaufanschlüsse und die beiden Ablaufanschlüsse und in einer Schaltstellung jeweils ein Zulauf- mit einem Ablaufanschluss verbunden. Über ein derartiges Schaltventil können vorteilhafterweise zwei Strömungspfade zwischen dem Steuerraum des Wegeventils der Hauptstufe und dem Tank oder der Druckmittelquelle verlaufen, bei gleichzeitig geringem Bauraumbedarf des Schaltventils.In a further advantageous embodiment of the invention, a switching valve has two inlet and two outlet connections. In a spring-biased basic position, the two inlet connections and the two outlet connections and in a switching position, in each case one inlet and one outlet connection are connected. About such a switching valve advantageously two flow paths between the control chamber of the directional control valve of the main stage and the tank or the pressure medium source can run, at the same time low space requirement of the switching valve.
Mit Vorteil hat das Wegeventil der Hauptstufe zwei Steuerräume, über die ein Hauptsteuerkolben proportional über die Vorstufe verstellbar ist. Bei diesem Wegeventil kann ein jeweiliger Steuerraum einfach über zumindest ein erstes Schaltventil mit der Druckquelle und über zumindest ein zweites Schaltventil mit dem Tank verbindbar sein.Advantageously, the directional control valve of the main stage has two control chambers, via which a main control piston is proportionally adjustable via the precursor. In this directional valve For example, a respective control chamber can be connected to the pressure source via at least one first switching valve and to the tank via at least one second switching valve.
Sonstige vorteilhafte Weiterbildungen der Erfindung sind Gegenstand weiterer Unteransprüche.Other advantageous developments of the invention are the subject of further subclaims.
Im Folgenden werden bevorzugte Ausführungsbeispiele anhand schematischer Zeichnungen näher erläutert. Es zeigen:
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einen Hydraulikschaltplan mit einer Ventilanordnung gemäß einem ersten Ausführungsbeispiel;Figur 1 -
einen Hydraulikschaltplan mit der Ventilanordnung gemäß einem zweiten Ausführungsbeispiel;Figur 2 -
Figur 3 einen Hydraulikschaltplan mit der Ventilanordnung gemäß einem dritten Ausführungsbeispiel; -
einen Hydraulikschaltplan mit der Ventilanordnung gemäß einem vierten Ausführungsbeispiel; undFigur 4 -
Figur 5 einen Hydraulikschaltplan mit der Ventilanordnung gemäß einem fünften Ausführungsbeispiel.
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FIG. 1 a hydraulic circuit diagram with a valve assembly according to a first embodiment; -
FIG. 2 a hydraulic circuit diagram with the valve assembly according to a second embodiment; -
FIG. 3 a hydraulic circuit diagram with the valve assembly according to a third embodiment; -
FIG. 4 a hydraulic circuit diagram with the valve assembly according to a fourth embodiment; and -
FIG. 5 a hydraulic circuit diagram with the valve assembly according to a fifth embodiment.
In der
Der Hydrospeicher 2 ist über eine Druckleitung 10 mit einem ersten Arbeitsanschluss 12 des Wegeventils 1 der Hauptstufe 6 verbunden. An einem zweiten Arbeitsanschluss 14 des Wegeventils 1 ist eine Arbeitsleitung 16 angeschlossen, die mit einem Zylinderraum 18 des Hydrozylinders 4 verbunden ist. Der Zylinderraum 18 wird von einem im Hydrozylinder 4 geführten Kolben 20 von einem Ringraum 22 getrennt, der von einer mit dem Kolben 20 verbundenen Kolbenstange 24 durchsetzt ist.The
Zum Auf- und Zusteuern der Druckmittelverbindung zwischen dem Hydrospeicher 2 und dem Hydrozylinder 4 weist das Wegeventil 1 einen einem Ventilsitz 26 zugeordneten Stufenkolben 28 auf. Eine vom Ventilsitz 26 abgewandte Steuerfläche 30 des Stufenkolbens 28 begrenzt einen Steuerraum 32, der über die Vorstufe 8 mit der Druckleitung 10 und somit mit dem Hydrospeicher 2 oder mit einem Tank 34 verbindbar ist. In dem Steuerraum 32 ist eine Schließfeder 36 angeordnet, die den Stufenkolben 28 über die Steuerfläche 30 in Richtung des Ventilsitzes 26 mit einer Federkraft beaufschlagt. An der Steuerfläche 30 stützt sich ein Wegmesskolben 38 eines Wegaufnehmers 40 zur Bestimmung des Hubewegs des Stufenkolbens 28 ab.To open and close the pressure medium connection between the
Der Stufenkolben 28 hat einen radial zurückgestuften Abschnitt 42, der im geschlossenen Zustand des Wegeventils 1 auf dem Ventilsitz 26 anliegt. Durch den zurückgestuften Abschnitt 42 hat der Stufenkolben 28 eine von der Steuerfläche 30 abweisende Ringfläche 44 und eine Stirnfläche 46. Im geschlossenen Zustand des Wegeventils 1 ist die Ringfläche 44 in Druckmittelverbindung mit dem Arbeitsanschluss 12 und damit der Druckleitung 10 und die Stirnfläche 46 mit dem Arbeitsanschluss 14 und damit der Arbeitsleitung 16 verbunden.The
Zur Verbindung mit der Vorstufe 8 ist an dem Steuerraum 32 des Wegeventils 1 eine Steuerleitung 48 angeschlossen, die mit einem Arbeitsanschluss A eines Wegeventils 50 der Vorstufe 8 verbunden ist. Dieses ist ein elektromagnetisch über einen Proportionalmagneten 52 - denkbar wäre auch ein Servo- oder Piezoelement - betätigbares Proportional-Wegeventil bzw. 3/2-Wegeventil. Das Wegeventil 50 hat des Weiteren einen Druckanschluss P, der über eine Verbindungsleitung 54 mit der Druckleitung 10 in Druckmittelverbindung steht. Über einen Tankanschluss T ist das Wegeventil 50 an eine mit dem Tank 34 verbundene Tankleitung 56 angeschlossen. Ein Vorsteuerschieber des Wegeventils 50 ist mit einer Ventilfeder 57 in einer Grundstellung a vorgespannt, in der der Druckanschluss P mit dem Arbeitsanschluss A verbunden ist - je nach Einsatz könnte die Grundstellung a auch anders ausgebildet sein. Über den Proportionalmagneten 52 ist der Vorsteuerschieber in Richtung von Arbeitsstellungen b verschiebbar, in denen der Arbeitsanschluss A mit dem Tankanschluss T verbunden ist. Durch das Wegeventil 50 ist die Position des Stufenkolbens 28 des Wegeventils 1 und der Druck im Steuerraum 32 regelbar.To connect to the
In der in
Um die zur Verschiebung des Stufenkolbens 28 in die Öffnungsrichtung benötigte Stellzeit des Wegeventils 1 zu verringern, sind in der Vorstufe 8 parallel zu dem Wegeventil 50 zwei Schaltventile 58, 60 angeordnet, über die eine Druckmittelverbindung zwischen dem Steuerraum 32 des Wegeventils 1 und dem Tank 34 auf- und zusteuerbar ist. Die Schaltventile 58, 60 sind elektromagnetisch verstellbare 2/2-Wegeventile und haben jeweils einen mit der Steuerleitung 48 verbundenen Arbeitsanschluss A und einen mit der Tankleitung 56 verbundenen Tankanschluss T. Ein Ventilschieber des Schaltventils 58 bzw. 60 ist über eine Ventilfeder 62 in eine Sperrstellung x vorgespannt, in der die Druckmittelverbindung zwischen dem Tankanschluss T und dem Arbeitsanschluss A getrennt ist. Über einen elektromagnetisch betätigbaren Aktor 64 ist der Ventilschieber des Schaltventils 58 bzw. 60 in eine Öffnungsstellung y schaltbar, in der der Arbeitsanschluss A mit dem Tankanschluss T verbunden ist.In order to reduce the time required for displacement of the stepped
Im Folgenden wird die Funktionsweise des Wegeventils 1 mit den Schaltventilen 58, 60 gemäß dem ersten Ausführungsbeispiel erläutert.In the following, the operation of the
Zum Öffnen des Wegeventils 1 wird der Steuerraum 32 über die Vorstufe 8 mit dem Tank 34 verbunden. Hierfür gibt es mehrere Möglichkeiten. Ist eine lange Stellzeit des Wegeventils 1 hinreichend, so wird lediglich der Vorsteuerschieber des Wegeventils 50, wie vorstehend erläutert, in Richtung der Arbeitsstellungen b verschoben. Zur Verkürzung der Stellzeit wird zusätzlich der Ventilschieber des Schaltventils 58 bzw. 60 in die Öffnungsstellung y gebracht, wodurch eine schnellere Entlastung des Steuerraums 32 zum Tank 34 erfolgt. Soll die Stellzeit weiter verkürzt werden, wird zusätzlich das zweite Schaltventil 58 bzw. 60 in die Öffnungsstellung y gebracht. Die Stellzeit kann somit durch zusätzliche Betätigung eines oder beider Schaltventile 58, 60 verkürzt werden. Durch die Druckentlastung des Steuerraums wird der Stufenkolben 28 über die Ringfläche 44, die vom Druck im Hydrospeicher 2 beaufschlagt ist, in die Öffnungsrichtung bewegt. Sind beispielsweise 70 % eines erforderlichen Öffnungshubs des Stufenkolbens 28 erreicht, so werden die Schaltventile 58 und 60 in die Sperrstellung x geschaltet, womit der restliche Hubweg über das Wegeventil 50 der Vorstufe 8 gesteuert wird. Mit dem Wegeventil 50 alleine ist eine genaue Positionierung des Stufenkolbens 28 des Wegeventils 1 ermöglicht.To open the
Zum Schließen des Wegeventils 1 sind das Wegeventil 50 und die Schaltventile 58 und 60 stromlos in der Grundstellung a bzw. Sperrstellung x. Der Steuerraum 32 ist dann über das Wegeventil 50 mit dem Hydrospeicher 2 verbunden, wodurch der Stufenkolben 28 über die Steuerfläche 30 mit dem Druck des Hydrospeichers 2 und der Federkraft der Schließfeder 36 in Schließrichtung gegen den an der Ringfläche 44 und der Stirnfläche 46 anliegenden Druck bewegt wird.To close the
Eine kurze Stellzeit des Stufenkolbens 28 des Wegeventils 1 wird beispielsweise benötigt, wenn der Hydrozylinder 4 zum Einspritzen von Spritzgussmittel in eine Spritzgussmaschine eingesetzt wird. Hierzu ist eine schnelle Druckbeaufschlagung des Kolbens 20 des Hydrozylinders 4 über den Zylinderraum 18 notwendig und somit eine schnelle Druckmittelverbindung zwischen der mit dem Zylinderraum 18 verbundenen Arbeitsleitung 16 und der mit dem Hydrospeicher 2 verbundenen Druckleitung 10 notwendig.A short positioning time of the stepped
Mit den Schaltventilen 66, 68 ist eine kürzere Stellzeit des Stufenkolbens 28 in Schließrichtung, im Vergleich zum ersten Ausführungsbeispiel aus
Ist die erforderliche Endposition des Stufenkolbens 28 erreicht oder liegt dieser auf dem Ventilsitz 26 an, so wird die Bestromung der Schaltventile 66, 68 unterbrochen.If the required end position of the stepped
Es ist denkbar, weitere Schaltventile parallel zu den Schaltventilen 58, 60 bzw. 66, 68 in der Vorstufe 8 anzuordnen, um die Stellzeit der Hauptstufe 6 weiter zu verringern.It is conceivable to arrange further switching valves parallel to the switching
Um bei einer Betätigung des Stufenkolbens 28 des Wegeventils 1 die Stellzeit zu senken, wird der Ventilschieber des Schaltventils 70 in die Öffnungsstellung i zusätzlich zu dem in die Arbeitsstellung b geschalteten Wegeventil 50 betätigt. In der Öffnungsstellung i wird die Steuerleitung 48 über das Schaltventil 70 zum einen über den Arbeitsanschluss A1 und den Tankanschluss T2 und zum anderen über den Arbeitsanschluss A2 und den Tankanschluss T1 mit der Tankleitung 56 verbunden, womit der Steuerraum 32 des Wegeventils 1 und der Tank 34 in Druckmittelverbindung stehen.In order to reduce the actuating time when the stepped
In der
Durch das zusätzliche Schaltventil 76 ist ein Zusteuern des Wegeventils 1 mit einer kürzeren Stellzeit ermöglicht. Die Funktionsweise entspricht dem Ausführungsbeispiel aus
Die Steuerräume 84, 86 sind jeweils über die Vorstufe 8 mit dem Tank 34 oder einer Druckmittelquelle 88 verbindbar. Die Vorstufe 8 hat ein elektromagnetisch stetig über Proportionalmagneten 90, 92 - denkbar ist beispielsweise auch ein Servo- oder Piezoelement oder ein Linearmotor - verstellbares 4/3-Wegeventil 94 und vier parallel dazu angeordnete Schaltventile 96, 98, 100, 102. Das Wegeventil 94 ist über einen Druckanschluss P mit einer mit der Druckmittelquelle 88 verbundenen Druckleitung 104 verbunden. Mit einem Tankanschluss T ist das Wegeventil 94 an eine mit dem Tank 34 verbundene Tankleitung 106 angeschlossen. Ein erster Arbeitsanschluss A des Wegeventils 94 steht über eine erste Arbeitsleitung 108 mit dem in der
Ein Ventilschieber des Wegeventils 94 der Vorstufe 8 ist über zwei Ventilfedern 112, 114 in einer Grundstellung r zentrierbar und durch Bestromung des Proportionalmagneten 90 in Richtung von Arbeitsstellungen m, in der der Arbeitsanschluss A mit dem Tankanschluss T und der Arbeitsanschluss B mit dem Druckanschluss P in Druckmittelverbindung stehen, verschiebbar. In der Grundstellung r sind beide Arbeitsanschlüsse mit dem Tankanschluss T in Druckmittelverbindung. Über den Proportionalmagneten 92 ist der Ventilschieber des Wegeventils 94 in Richtung von Arbeitsstellungen n verschiebbar, in denen der Arbeitsanschluss A mit dem Druckanschluss P und der Arbeitsanschluss B mit dem Tankanschluss T in Druckmittelverbindung steht. Somit wird in den Arbeitsstellungen m der in der Figur rechte Steuerraum 86 des Wegeventils 82 der Hauptstufe 6 mit der Druckquelle 88 und in den Arbeitsstellungen n der linke Steuerraum 84 mit der Druckmittelquelle 88 verbunden. Der jeweils nicht mit der Druckmittelquelle 88 verbundene Steuerraum 84 bzw. 86 in den Arbeitsstellungen m und n des Wegeventils 94 ist dann mit dem Tank 34 verbunden.A valve spool of the
Das Wegeventil 82 der Hauptstufe 6 hat in der
Mit den in der
Die Schaltventile 96 bis 102 entsprechen denen aus den ersten beiden Ausführungsbeispielen aus
Das Schaltventil 98 ist über einen Arbeitsanschluss A mit der Arbeitsleitung 108 und über einen Druckanschluss P mit der Druckmittelquelle 88 und das Schaltventil 96 über einen Arbeitsanschluss A mit der Arbeitsleitung 108 und mit einem Tankanschluss T mit dem Tank 34 verbunden. Der linke Steuerraum 84 des Wegeventils 82 ist damit über das Schaltventil 98 mit der Druckmittelquelle 88 und mit dem Schaltventil 96 mit dem Tank 34 verbindbar.The switching
Der Hauptsteuerkolben des Wegeventils 82 der Hauptstufe 6 ist über Ventilfedern 116, 118 in einer Sperrstellung u vorgespannt, über den Steuerraum 86 in Richtung von Arbeitsstellungen w und über den Steuerraum 84 in Richtung von Arbeitsstellungen v verschiebbar. Ein Wegaufnehmer 120 misst dabei den Verschiebeweg des Hauptsteuerkolbens.The main control piston of the
Zum Verstellen des Hauptventilschiebers des Wegeventils 82 der Hauptstufe 6 in Richtung der Arbeitsstellungen v wird der in der
Zum Verschieben des Hauptsteuerkolbens des Wegeventils 82 in Richtung der Arbeitsstellungen w wird entsprechend der Steuerraum 86 über das Wegeventil 94 mit der Druckquelle 88 und der Steuerraum 84 mit dem Tank 34 verbunden. Zum Verkürzen der Stellzeit werden dann das Schaltventil 96 und das Schaltventil 100 geöffnet.To move the main control piston of the
Es ist denkbar, bei dem Ausführungsbeispiel in
Die Schaltventile aus den
Die Wegeventile 50 und 94 der Vorstufe 8 aus den
Die Schaltventile 58, 60; 66, 68; 96, 98, 100, 102 in den
Offenbart ist ein vorgesteuertes Ventil mit einer Haupt- und einer Vorstufe. Die Hauptstufe weist ein Wegeventil auf, das beispielsweise als Sitz- oder Schieberventil ausgebildet ist. Ein derartiges Wegeventil hat zumindest einen Steuerraum, der über ein Wegeventil der Vorstufe mit einer Druckquelle oder einem Tank verbunden ist. Zur Verkürzung der Stellzeit des Wegeventils der Hauptstufe ist parallel zum Wegeventil der Vorstufe wenigstens ein Schaltventil angeordnet. Dieses ist äußerst kostengünstig und robust, weist eine geringe Schaltzeit auf und ermöglicht eine Erhöhung des Druckmitteldurchsatzes durch die Vorstufe.Disclosed is a pilot operated valve with a main and a preliminary stage. The main stage has a directional control valve, which is designed for example as a seat or slide valve. Such a directional control valve has at least one control chamber, which is connected via a directional control valve of the preliminary stage with a pressure source or a tank. To shorten the positioning time of the directional control valve of the main stage at least one switching valve is arranged parallel to the directional control valve of the precursor. This is extremely inexpensive and robust, has a low switching time and allows an increase in the pressure medium throughput through the precursor.
- 11
- Wegeventilway valve
- 22
- Hydrospeicherhydraulic accumulator
- 44
- Hydrozylinderhydraulic cylinders
- 66
- Hauptstufemain stage
- 88th
- Vorstufepreliminary stage
- 1010
- Druckleitungpressure line
- 1212
- Arbeitsanschlussworking port
- 1414
- Arbeitsanschlussworking port
- 1616
- Arbeitsleitungworking line
- 1818
- Zylinderraumcylinder space
- 2020
- Kolbenpiston
- 2222
- Ringraumannulus
- 2424
- Kolbenstangepiston rod
- 2626
- Ventilsitzvalve seat
- 2828
- Stufenkolbenstepped piston
- 3030
- Steuerflächecontrol surface
- 3232
- Steuerraumcontrol room
- 3434
- Tanktank
- 3636
- Schließfederclosing spring
- 3838
- WegmesskolbenWegmesskolben
- 4040
- Wegaufnehmertransducer
- 4242
- Abschnittsection
- 4444
- Ringflächering surface
- 4646
- Stirnflächeface
- 4848
- Steuerleitungcontrol line
- 5050
- Wegeventilway valve
- 5252
- Proportionalmagnetproportional solenoid
- 5454
- Verbindungsleitungconnecting line
- 5656
- Tankleitungtank line
- 5858
- Schaltventilswitching valve
- 6060
- Schaltventilswitching valve
- 6262
- Ventilfedervalve spring
- 6464
- Aktoractuator
- 6666
- Schaltventilswitching valve
- 6868
- Schaltventilswitching valve
- 7070
- Schaltventilswitching valve
- 7272
- Ventilfedervalve spring
- 7474
- Aktoractuator
- 7676
- Schaltventilswitching valve
- 7878
- Ventilfedervalve spring
- 8080
- Aktoractuator
- 8282
- Wegeventilway valve
- 8484
- Steuerraumcontrol room
- 8686
- Steuerraumcontrol room
- 8888
- DruckmittelquellePressure medium source
- 9090
- Proportionalmagnetproportional solenoid
- 9292
- Proportionalmagnetproportional solenoid
- 9494
- Wegeventilway valve
- 9696
- Schaltventilswitching valve
- 9898
- Schaltventilswitching valve
- 100100
- Schaltventilswitching valve
- 102102
- Schaltventilswitching valve
- 104104
- Druckleitungpressure line
- 106106
- Tankleitungtank line
- 108108
- Arbeitsleitungworking line
- 110110
- Arbeitsleitungworking line
- 112112
- Ventilfedervalve spring
- 114114
- Ventilfedervalve spring
- 116116
- Ventilfedervalve spring
- 118118
- Ventilfedervalve spring
- 120120
- Wegaufnehmertransducer
- PP
- Druckanschlusspressure connection
- A, A1, A2A, A1, A2
- Arbeitsanschlussworking port
- T, T1, T2T, T1, T2
- Tankanschlusstank connection
- a, h, k, ra, h, k, r
- Grundstellunginitial position
- b, m, n, w, vb, m, n, w, v
- Arbeitsstellungworking position
- x, ux, u
- Sperrstellungblocking position
- y, i, ly, i, l
- Öffnungsstellungopen position
Claims (10)
- Valve arrangement having a pilot-controlled valve which has a main stage and a pilot stage (6, 8), wherein the main stage (6) has a directional valve (1; 82) with at least one control chamber (32; 84, 86) which can be connected by means of a directional valve (50; 94) of the pilot stage (8) to a pressure source (2; 88) or to an outlet (34), characterized in that at least one switching valve (58, 60, 66, 68; 70, 76; 96, 98, 100, 102) is arranged in parallel with the directional valve (50; 94) of the pilot stage (8).
- Valve arrangement according to Claim 1, wherein the directional valve (50, 94) of the pilot stage (8) is a proportional directional valve.
- Valve arrangement according to Claim 2, wherein the control chamber of the directional valve (1; 82) of the main stage (6) can be connected by means of the directional valve (50; 94) of the pilot stage (8) to the pressure source (2; 88) or to the outlet (34) and by means of at least one of the switching valves (58, 60; 70; 96, 102) to the outlet (34) and/or by means of at least one of the switching valves (66, 68, 76, 98, 100) to the pressure source (2, 88).
- Valve arrangement according to one of the preceding claims, wherein the switching valve (58, 60, 66, 68, 96, 98, 100, 102) has an inlet port and an outlet port (A, T; P, A), wherein in a spring-preloaded blocking position, a pressure medium connection between the inlet port and the outlet port (A, T; P, A) is blocked, and wherein in an open position, the inlet port and the outlet port (A, T; P, A) have a pressure medium connection to one another.
- Valve arrangement according to one of the preceding claims, wherein the directional valve (1) of the main stage (6) has a control chamber (32) which can be connected by means of two switching valves (58, 60) to the outlet (34).
- Valve arrangement according to one of the preceding claims, wherein the control chamber (32) of the directional valve (1) of the main stage (6) can be connected by means of two switching valves (66, 68) to the pressure source (2).
- Valve arrangement according to one of Claims 1 to 4, wherein the switching valve (70, 76) has two inlet and two outlet ports (A1, A2, P1, P2, T1, T2), wherein in a spring-preloaded basic position (h, k), the two inlet ports (A1, A2; P1, P2) and the two outlet ports (T1, T2; A1, A2) are connected, and in a switching position (i, 1), in each case one inlet port is connected to one outlet port (A1, A2, P1, P2, T1, T2).
- Valve arrangement according to Claim 7, wherein the switching valve (70) is connected via the inlet ports (A1, A2) to the control chamber (32) and via the outlet ports (T1, T2) to the tank (34), and/or the switching valve (76) is connected via the inlet ports (P1, P2) to the pressure source (2) and via the outlet ports (A1, A2) to the control chamber (32).
- Valve arrangement according to one of Claims 1 to 4 or 7, wherein the directional valve (82) of the main stage (6) has two control chambers (84, 86) by means of which a main control piston can be adjusted proportionally by means of the pilot stage (8).
- Valve arrangement according to Claim 9, wherein each control chamber (84, 86) of the directional valve (82) of the main stage (6) can be connected by means of at least one first switching valve (98, 100) to the pressure source (88) and by means of at least one second switching valve (96, 102) to the tank (34).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009030888A DE102009030888A1 (en) | 2009-06-29 | 2009-06-29 | valve assembly |
PCT/EP2010/003851 WO2011000515A1 (en) | 2009-06-29 | 2010-06-29 | Valve arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2449268A1 EP2449268A1 (en) | 2012-05-09 |
EP2449268B1 true EP2449268B1 (en) | 2013-01-23 |
Family
ID=42767971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10739848A Not-in-force EP2449268B1 (en) | 2009-06-29 | 2010-06-29 | Valve arrangement |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2449268B1 (en) |
CN (1) | CN102472299B (en) |
DE (1) | DE102009030888A1 (en) |
WO (1) | WO2011000515A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012016838B4 (en) | 2012-08-27 | 2023-12-28 | Robert Bosch Gmbh | Hydraulic control circuit for a hydraulically operated casting unit |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012020066A1 (en) | 2012-10-12 | 2014-04-17 | Robert Bosch Gmbh | valve assembly |
CN111550465B (en) * | 2020-05-15 | 2022-05-20 | 北京林克富华技术开发有限公司 | Control valve group |
DE102022113397A1 (en) | 2022-05-27 | 2023-11-30 | Festo Se & Co. Kg | Controlling a volume flow of a fluid using a valve arrangement |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4753158A (en) * | 1985-09-06 | 1988-06-28 | Hitachi, Construction Machinery Co., Ltd. | Pilot hydraulic system for operating directional control valve |
EP0281635B1 (en) * | 1986-09-09 | 1991-02-27 | Hitachi Construction Machinery Co., Ltd. | Valve device |
DE4405143C2 (en) | 1994-02-18 | 2002-03-14 | Bosch Gmbh Robert | Electro-hydraulic proportional directional valve |
US6318234B1 (en) * | 2000-06-30 | 2001-11-20 | Caterpillar Inc. | Line vent arrangement for electro-hydraulic circuit |
DE102004048689B3 (en) * | 2004-10-06 | 2005-10-20 | Siemens Ag | Two-stage servo valve |
CN101203681A (en) * | 2005-03-31 | 2008-06-18 | 独立行政法人科学技术振兴机构 | Actuator using fluid cylinder and method of controlling the same |
-
2009
- 2009-06-29 DE DE102009030888A patent/DE102009030888A1/en not_active Withdrawn
-
2010
- 2010-06-29 WO PCT/EP2010/003851 patent/WO2011000515A1/en active Application Filing
- 2010-06-29 CN CN201080033573.4A patent/CN102472299B/en not_active Expired - Fee Related
- 2010-06-29 EP EP10739848A patent/EP2449268B1/en not_active Not-in-force
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012016838B4 (en) | 2012-08-27 | 2023-12-28 | Robert Bosch Gmbh | Hydraulic control circuit for a hydraulically operated casting unit |
Also Published As
Publication number | Publication date |
---|---|
CN102472299A (en) | 2012-05-23 |
DE102009030888A1 (en) | 2010-12-30 |
WO2011000515A1 (en) | 2011-01-06 |
CN102472299B (en) | 2015-07-08 |
EP2449268A1 (en) | 2012-05-09 |
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