EP1510699A2 - Verfahren und Vorrichtung zur Flutumschaltung - Google Patents
Verfahren und Vorrichtung zur Flutumschaltung Download PDFInfo
- Publication number
- EP1510699A2 EP1510699A2 EP20040018691 EP04018691A EP1510699A2 EP 1510699 A2 EP1510699 A2 EP 1510699A2 EP 20040018691 EP20040018691 EP 20040018691 EP 04018691 A EP04018691 A EP 04018691A EP 1510699 A2 EP1510699 A2 EP 1510699A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- slide
- diameter
- sliding ring
- valve
- 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
Links
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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
- F15B13/02—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
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
- F15B13/0403—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves a secondary valve member sliding within the main spool, e.g. for regeneration flow
-
- 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
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86582—Pilot-actuated
-
- 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
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86622—Motor-operated
- Y10T137/8663—Fluid motor
Definitions
- the invention relates to a method and apparatus for rapid switching of a liquid or gaseous medium in a hydraulic or pneumatic route by means of a pump depending on the pilot pressure either in a reservoir or in the hydraulic / pneumatic route using a switching valve.
- the control of, for example, an oil flow in a hydraulic path takes place primarily via at least one pump, the direction and the flow rate of which are arranged in the hydraulic path, correspondingly pilot operated valves.
- a balance of hydraulic amount is realized via a reservoir, so that corresponding valves or valve assemblies are provided to realize a flood switch from the pump either in the hydraulic path or in the reservoir.
- valves can be different Function, such as a non-return and overpressure valve function, coupled together as a pilot-operated pressure control valve with a Check valve.
- the spring chamber of the pressure regulating piston is over another Throttle bore in the pressure regulating piston itself with a pressure or pump connection in Connection. If the applied static pressure exceeds the setting value of the pressure valve, this is opened, allowing hydraulic fluid to drain to the reservoir. This drainage creates a pressure drop in the spring chamber of the pressure regulating piston, whereby the closing force of the spring is released and the pressure regulating piston of the Check valve opens the way to the reservoir.
- valves are converted in a valve unit.
- the housing of the valve is spring loaded with two slide-like closure pieces provided in the valve bore against each other are displaceable.
- the guided in a housing bore plug works with a housing-tight valve seat together.
- Both spring chambers of the closure pieces communicate with each other.
- the first, working as a valve spool Closure piece serves to control at least one control terminal, which is connected to a pressure relief valve.
- valve spool with a Pressure applied which is higher than the two spring forces in the spring chambers, lifts the valve slide from its housing-fixed valve seat and closes it the control terminal.
- the other piece of closure works as a pressure regulating piston and communicates with the other side panel connections made during this Operation be released or opened accordingly.
- valve spool will cover for a certain time during switching defined area in the housing, which must be technical, so that the hydraulic Route can not be connected directly to the reservoir.
- the housing side connections to the hydraulic range and to Pump covered which is otherwise built up before the pump pressure from the pressure relief valve, which is located between the hydraulic line and the pump, limited.
- a pressure relief valve is also the use of a check valve known.
- a check valve When using a check valve, however, it is not guaranteed that it works reliably. If the pilot pressure rises, it opens. If the pilot pressure drops It speaks with a time delay and oil can now both in the hydraulic Drain route as well as in the reservoir.
- the object of the invention is the fluid from a pump pilot pressure dependent in different Switch line connections so that the time required for this purpose is shortened and the switching is realized by means of only one valve while the size the valve undergoes only an insignificant change.
- this object is achieved in that the slide a first Slider element and a second slider element which, at least during a Time interval of the switching operation are independently accelerated. This acceleration serves to shorten the switching process to the During the switching before the pump occurring pressure increase as fast as possible to reduce what u. a. extends the life of the pump.
- the axial movement of the slide in the valve is another superimposed on axial movement, resulting in a resulting movement, the Result of the addition of equal and opposite forces, these forces during the switching operation at the same time or with a time delay acting on the slide.
- a pump either with a fluidic path or with a reservoir by means of a pilot pressure-dependent three-way valve connected is.
- a two-part slider with a first slider element and a second slider element and that the housing of the valve has additional connections to the pump, which are connected to the existing connections in Connect axial direction and spaced both from these and from each other are.
- the slide before its pressure spring end a Having cut in two correspondingly wide steps towards this end reached the diameter of the slider again and with another outermost stage adapts to the inner diameter of the housing.
- This step-like design of the Nick has the advantage that it simultaneously realizes defined attacks can be. So offers by the structural design of the housing, that the radial annular surface created with the outermost step of the slider is the return surface forms and advantageously with the stop surface the way of the compression spring limited.
- the slide is arranged in the radial direction with a centrally Through hole provided The diameter of this hole is equal to the Diameter of the two additional pump connections to choose a safe To be able to establish connection between pump and slide and no pressure losses to achieve.
- the distance of the through hole of the pressing surface so to choose that at the time when the groove of the slider in the overlap area The slider is located above this through hole with the additional left Pump connection is connected.
- the holes provided in the slide which are connected at right angles to a pipe are, serve together with the step-like incision for receiving a defined volume of oil, with which in case of need by pressurization or Release the pressure to allow movements of components. So that will be in the Blind hole existing bolt within the blind hole either in Moved towards the housing wall or towards the bore. It is advantageous that he has a certain length to also center for the slide in the housing to be able to.
- a further advantageous embodiment of the invention provides that function-related the width of the innermost stage of the incision is defined by the distance between outer wall of the diameter of the through hole to the paragraph the subsequent second stage and the width of the second stage from the Sum of the diameters of the two additional pump connections and their distance from each other.
- the width of the second stage of the incision to the the innermost connects and over the heel - like reduction of the wall thickness of the Housing goes out.
- an additional pressure chamber is formed, which also serves to influence the axial movement of the slider.
- the outer diameter of the sliding ring with the inner diameter of the housing corresponds, d. h., that both abut each other.
- the width of the sliding ring results the difference between the width of the innermost step width and the diameter of the connection. This ensures that always an additional pump connection is open, when the sliding ring is in one of its end positions at the innermost stage.
- Another advantage is that the surface roughness of outer and inner diameter the sliding ring is different.
- the roughness of the surface on the outer diameter of the sliding ring is higher than on Inner diameter. This will cause a stiction between the surface of the Sliding rings and the surface of the inner diameter of the housing reached, which exploited will cause a delay in reversing the direction of movement of the slider to reach.
- the slide and sliding ring of metallic Material is made.
- both may as well be non-metallic Material and made of plastic material.
- the two components can be different Have materials. This depends on the particular application.
- FIG. 1 the basic structure and operation of the invention in one hydraulic track can be seen.
- a reversing valve in the form of a three-way valve, which is connected via two connections to an assembly is from a, not shown Control, with a pilot pressure carried by a piston, applied.
- the closing body or slider present in the valve is so moves that the desired lines are connected together.
- Fig. 1 is essentially a connection from the pump to the hydraulic Detachable track, which is interrupted by the closing body of the valve at falling pilot pressure is used to make the connection hydraulic range - reservoir.
- the slide covers in the valve housing a certain area, so that in this no connection to two terminals can be produced, but always a housing connection is closed.
- overlap area is technically conditioned to connect the hydraulic Exclude route with the reservoir.
- the valve 8, consisting essentially of a housing 1 and a slide 2, the u. a. is held by a compression spring 11 in a certain position.
- a connection is used to introduce hydraulic oil for admission the pressing surface 14 of the slider 2 with a certain pressure, the pilot pressure.
- the further holes are for connections to a pump 4, 4a and 4b, to a Reservoir 5 and 6 provided for hydraulic route.
- the slider 2 is at a distance from the pressing surface 14 with a circumferential Groove 7 provided whose width is the distance between two adjacent connections plus their diameter. This ensures that the groove 7 in axial Movement of the slider 2 each two of the adjacent terminals 6, 4, 5 covered, is the distance of the groove 7 of the pressing surface 14 depending on the stop of the Slider 2 on the housing 1, resulting from the impact of the return surface 12 of the Slider 2 on the stop surface 9 of the housing 1 results.
- the Ports 4a and 4b provided.
- the Slider 2 on a radial incision 10 the diameter of the slider 2 on a certain diameter tapers. This is in the axial direction over a certain Maintain length until the subsequent stage, first of the original diameter of the slider 2 is reached again.
- Another in continuation the slider 2 subsequent stage whose diameter is greater than its is original diameter is used with the housing 1 to form a stop.
- the slider 2 is arranged in the radial direction with a centric Through hole 13 provided at two points of the circumference of the incision 10 penetrates and thereby affects its outer wall.
- this bore 13 is equal to that of the terminals 4a and 4b.
- the slider 2 is further provided with an axial center blind hole 17, starting out from whose réellefeder devisem end, with the through hole 13 coincides.
- a bolt 18 is arranged, which is used to center the Slider 2 on the inner wall of the housing 1 is supported. Furthermore, the two holes 13 and 17 filled with hydraulic fluid.
- the innermost stage of the incision 10 serves to receive a sliding ring 16, within the limitation of the step, d. H. from the outer wall of the through hole 13th up to the subsequent stage, is axially movable.
- This sliding ring 16 has a Outer diameter, the inner diameter of the housing 1 at this point is adjusted. Its width is defined by the distance between the terminals 4a and 4b from each other plus the diameter of one of these ports, both Diameter, functionally, are the same size.
- the surface of the Schieberings 16 roughened on the outer circumference, so that while this axially on the slide 2 is movable, but always a certain static friction to the inner wall of the housing 1 is guaranteed.
- the arrangement and design of the Incision 10 of particular importance. Is the circumferential groove 7 in the Area of the housing 1, where only the terminal 4 remains open, the bore has 4a be congruent with the through hole 13. He is in this presentation the through hole subsequent incision 10 has, as already mentioned, on two steps, where the width of the innermost step is so great that they are the two ports 4a and 4b and their space covered. The subsequent stage must be so wide that it extends beyond the heel of the housing 1, so that in connection with the outermost stage in this position of the slider 2, a second Pressure chamber 20 is created. The two holes 13 and 17 together the third pressure chamber 21.
- the slider 2 is in the vicinity of the left inner wall of the housing 1 of the valve 8.
- a suitably dimensioned centrally mounted on the inner wall Spacer ensures that the slide 2 is always at a distance of the inner wall of the housing 1 is held, so that with a corresponding Pilot pressure biased hydraulic fluid introduced into the first pressure chamber 19 can be.
- the slider 2 has as far in the direction Compression spring 11 moves, that the sliding ring 16, the terminal 4b closed and at the same time the connection 4a has opened. It has the third pressure chamber 21st hydraulic fluid at the same time the bolt 18 to the wall of the housing. 1 pressed, which has built up a pressure, which endeavors to break down again. This Pressure reduction causes the slide 2, led by the bolt 18, back into his Starting position is moved. Up to the time when the sliding ring 16 its right Has reached stop, the terminals 4 and 5 are connected together.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Pressure Circuits (AREA)
- Fluid-Driven Valves (AREA)
- Stereo-Broadcasting Methods (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Die Steuerung beispielsweise eines Ölstromes in einer hydraulischen Strecke erfolgt in erster Linie über mindestens eine Pumpe, wobei die Richtung und die Durchflussmenge von in der hydraulischen Strecke angeordneten, entsprechend vorgesteuerten Ventilen festgelegt werden. Ein Ausgleich von Hydraulikmenge wird über einen Vorratsbehälter realisiert, so dass entsprechende Ventile oder Ventilanordnungen dafür vorgesehen sind, eine Flutumschaltung von der Pumpe entweder in die hydraulische Strecke oder in den Vorratsbehälter zu realisieren.
- Fig. 1:
- eine prinzipielle Darstellung der erfindungsgemäßen Lösung in einer hydraulischen Strecke
- Fig. 2 - 5:
- die Wirkungsweise des erfindungsgemäßen Umschaltventils bei unterschiedlichen Vorsteuerdrücken.
Kurzzeichenliste | |
1 | Gehäuse |
2 | Schieber |
3 | Druckanschluss |
4 | Pumpenanschluss |
4a | Pumpenanschluss |
4b | Pumpenanschluss |
5 | Anschluss Vorratsbehälter |
6 | Anschluss hydraulische Strecke |
7 | Umlaufende Nut |
8 | Ventil |
9 | Anschlagfläche |
10 | Stufenartiger Einschnitt |
11 | Druckfeder |
12 | Rückführfläche |
13 | Durchgangsbohrung |
14 | Andrückfläche |
15 | Überdeckungsbereich |
16 | Schiebering |
17 | Grundlochbohrung |
18 | Bolzen |
19 | Erster Druckraum |
20 | Zweiter Druckraum |
21 | Dritter Druckraum |
Claims (26)
- Verfahren zur Freigabe eines Ausgangsanschlusses mit Hilfe eines Ventils (8), das ein Gehäuse (1) mit einem Eingangsanschluss (3) und einem ersten Ausgangsanschluss (6) und einem zweiten Ausgangsanschluss (5) aufweist und mit einem im Gehäuse (1) bewegbaren Schieber (2), dadurch gekennzeichnet, dass der Schieber (2) ein erstes Schieberelement (2) und ein zweites Schieberelement (16) aufweist, die zumindest während eines Zeitintervalls des Umschaltvorganges unabhängig voneinander beschleunigt werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Fluidumschaltung von einer Pumpe entweder in eine fluidische Strecke (6) oder in einen Vorratsbehälter (5) mittels eines vorsteuerdruckabhängigen Drei-Wege-Ventils (8) stattfindet.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein Anstieg oder Abfall des Vorsteuerdrucks eine axiale Bewegung des Schiebers (2) im Ventil (8) auslöst, die von einer weiteren axialen Bewegung überlagert wird.
- Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, dass sich die resultierende Bewegung des Schiebers (2) ergibt aus der Addition gleich- und entgegengerichteter Kräfte.
- Verfahren nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, dass die Überlagerung der Bewegung des Schiebers (2) während des Umschaltvorganges zeitgleich oder zeitversetzt erfolgt.
- Verfahren nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, dass eine im Schieber (2) gespeicherte Ölmenge während des Umschaltvorgangs in die vorbestimmte Richtung lenkbar ist.
- Vorrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, dass eine Pumpe entweder mit einer fluidischen Strecke (6) oder mit einem Vorratsbehälter (5) mittels eines vorsteuerdruckabhängigen Drei-Wege-Ventils (8) verbunden ist. das einen zweiteiligen Schieber (2) mit einem ersten Schieberelement (2) und einem zweiten Schieberelement (16) enthält.
- Vorrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 7 dadurch gekennzeichnet, dass das Gehäuse (1) des Ventils (8) über weitere Anschlüsse zur Pumpe (4a und 4b) verfügt, die sich an die vorhandenen Anschlüsse (6, 4, 5) in axialer Richtung anschließen und sowohl von diesen als auch voneinander beabstandet sind.
- Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass sich druckfederseitig nach dem Anschluss (4b) die Wandstärke des Gehäuses (1) absatzartig verringert und für den restlichen Gehäuseteil gleich bleibt und die am Absatz entstandene radiale Ringfläche die Anschlagfläche (9) bildet.
- Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass der Schieber (2) vor seinem druckfederseitigen Ende einen Einschnitt (10) aufweist, der in zwei entsprechend breiten Stufen in Richtung dieses Endes den Durchmesser des Schiebers (2) wieder erreicht und mit einer weiteren äußersten Stufe sich dem Innendurchmesser des Gehäuses (1) anpasst.
- Vorrichtung nach Anspruch 9 und 10, dadurch gekennzeichnet, dass die mit der äußersten Stufe gebildete radiale Ringfläche die Rückführfläche (12) bildet, die mit der Anschlagfläche (9) den Weg der Druckfeder (11) begrenzt.
- Vorrichtung nach den Ansprüchen 7 bis 11, dadurch gekennzeichnet, dass der Schieber (2) in radialer Richtung mit einer zentrisch angeordneten Durchgangsbohrung (13) versehen ist, deren Durchmesser gleich dem Durchmesser der Anschlüsse (4a) und (4b) ist.
- Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass der Abstand der Durchgangsbohrung (13) von der Andrückfläche (14) so gewählt wird, dass währenddem sich die Nut (7) des Schiebers (2) im Überdeckungsbereich (15) befindet, über die Durchgangsbohrung (13) eine Verbindung zum Anschluss (4a) hergestellt wird.
- Vorrichtung nach Anspruch 12 und 13, dadurch gekennzeichnet, dass im Schieber (2), von dessen druckfederseitigem Ende ausgehend, achsmittig eine in die Durchgangsbohrung (13) einmündende Grundlochbohrung (17) vorgesehen ist, in der ein Bolzen (18) geführt wird.
- Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass sich der Bolzen (18) endseitig an der Innenwand des Gehäuses (1) abstützt und eine Länge aufweist, die kleiner oder gleich der der Grundlochbohrung (17) ist.
- Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Breite der innersten Stufe des Einschnitts (10) definiert wird durch die Entfernung zwischen äußerer Wandung des Durchmessers der Durchgangsbohrung (13) bis zum Absatz der sich anschließenden zweiten Stufe.
- Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass sich die Breite der zweiten Stufe aus der Summe der Durchmesser der Anschlüsse (4a) und (4b) und deren Abstand voneinander ergibt.
- Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass sich die Breite der zweiten Stufe des Einschnitts (10) an die der innersten anschließt und über die absatzartige Verringerung der Wandstärke des Gehäuses (1) hinausgeht
- Vorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass auf der innersten Stufe des Einschnitts (10) ein Schiebering (16) aufgebracht ist, der sich auf dieser axial bewegen kann.
- Vorrichtung nach Anspruch 19, dadurch gekennzeichnet, dass der Außendurchmesser des Schieberings (16) mit dem Innendurchmesser des Gehäuses (1) korrespondiert.
- Vorrichtung nach Anspruch 19 und 20, dadurch gekennzeichnet, dass der Außendurchmesser des Schieberings (16) mit dem Innendurchmesser des Gehäuses (1) eine Reibpaarung bildet.
- Vorrichtung nach Anspruch 19 bis 21, dadurch gekennzeichnet, dass der Innendurchmesser des Schieberings (16) mit dem Durchmesser des Einschnitts (10) einen Spalt bildet.
- Vorrichtung nach einem der Ansprüche 19 bis 22, dadurch gekennzeichnet, dass sich die Breite des Schieberings (16) ergibt aus der Differenz der Breite der innersten Stufenbreite und dem Durchmesser des Anschlusses (4a).
- Vorrichtung nach einem der Ansprüche 19 bis 23, dadurch gekennzeichnet, dass die Oberflächenrauhigkeit von Außen- und Innendurchmesser des Schieberings (16) unterschiedlich sind.
- Vorrichtung nach Anspruch 20, dadurch gekennzeichnet, dass die Rauhigkeit der Oberfläche des Außendurchmessers des Schieberings (16) höher als die des Innendurchmessers ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche 7 bis 25, dadurch gekennzeichnet, dass Schieber (2), Schiebering (16) und Gehäuse aus metallischem oder nichtmetallischem Werkstoff oder Kunststoff herstellbar sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10338881 | 2003-08-23 | ||
DE10338881 | 2003-08-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1510699A2 true EP1510699A2 (de) | 2005-03-02 |
EP1510699A3 EP1510699A3 (de) | 2005-07-20 |
EP1510699B1 EP1510699B1 (de) | 2008-03-05 |
Family
ID=34089182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040018691 Not-in-force EP1510699B1 (de) | 2003-08-23 | 2004-08-06 | Verfahren und Vorrichtung zur Flutumschaltung |
Country Status (5)
Country | Link |
---|---|
US (1) | US7458396B2 (de) |
EP (1) | EP1510699B1 (de) |
JP (1) | JP2005069482A (de) |
AT (1) | ATE388331T1 (de) |
DE (2) | DE502004006385D1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110124384B (zh) * | 2019-05-19 | 2022-03-15 | 非润科技(山东)有限公司 | 一种污水处理系统 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3723672C2 (de) | 1987-07-17 | 1991-03-21 | Wessel-Hydraulik Gmbh, 2940 Wilhelmshaven, De |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3107693A (en) * | 1961-05-24 | 1963-10-22 | Robertshaw Controls Co | Pneumatic relay |
US3267965A (en) * | 1963-03-28 | 1966-08-23 | Airmatic Valve Inc | Pilot operated spool valve |
US3548879A (en) * | 1968-11-12 | 1970-12-22 | Teldix Gmbh | Three-way valve |
US3610285A (en) * | 1969-12-11 | 1971-10-05 | Scovill Manufacturing Co | Sliding valve |
JPS5326686B2 (de) * | 1973-11-07 | 1978-08-03 | ||
US4187884A (en) * | 1978-06-12 | 1980-02-12 | General Gas Light Company | Four-way valve employing fluid spring |
JPS5655762A (en) * | 1979-10-15 | 1981-05-16 | Hitachi Ltd | Fluid control valve |
DE3629479A1 (de) * | 1985-09-03 | 1987-07-16 | Barmag Barmer Maschf | Wegeventil |
US4763691A (en) | 1985-09-03 | 1988-08-16 | Barmag Barmer Maschinenfabrik Aktiengesellschaft | Hydraulic control valve |
US4649957A (en) * | 1986-01-27 | 1987-03-17 | The Aro Corporation | Fluid assisted spring return for pilot operated, spool valve |
DE10135298A1 (de) * | 2001-07-24 | 2003-02-13 | Bosch Rexroth Ag | Ventilanordnung |
-
2004
- 2004-08-06 DE DE200450006385 patent/DE502004006385D1/de active Active
- 2004-08-06 EP EP20040018691 patent/EP1510699B1/de not_active Not-in-force
- 2004-08-06 AT AT04018691T patent/ATE388331T1/de not_active IP Right Cessation
- 2004-08-06 DE DE200410038193 patent/DE102004038193A1/de not_active Withdrawn
- 2004-08-17 US US10/919,941 patent/US7458396B2/en not_active Expired - Fee Related
- 2004-08-20 JP JP2004240676A patent/JP2005069482A/ja not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3723672C2 (de) | 1987-07-17 | 1991-03-21 | Wessel-Hydraulik Gmbh, 2940 Wilhelmshaven, De |
Also Published As
Publication number | Publication date |
---|---|
EP1510699A3 (de) | 2005-07-20 |
ATE388331T1 (de) | 2008-03-15 |
JP2005069482A (ja) | 2005-03-17 |
US7458396B2 (en) | 2008-12-02 |
DE102004038193A1 (de) | 2005-03-17 |
DE502004006385D1 (de) | 2008-04-17 |
US20050039803A1 (en) | 2005-02-24 |
EP1510699B1 (de) | 2008-03-05 |
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