EP0005818B1 - Hydraulically operated 3-way seat valve - Google Patents

Hydraulically operated 3-way seat valve Download PDF

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Publication number
EP0005818B1
EP0005818B1 EP19790101638 EP79101638A EP0005818B1 EP 0005818 B1 EP0005818 B1 EP 0005818B1 EP 19790101638 EP19790101638 EP 19790101638 EP 79101638 A EP79101638 A EP 79101638A EP 0005818 B1 EP0005818 B1 EP 0005818B1
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EP
European Patent Office
Prior art keywords
control
piston
valve
way seat
connection
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Expired
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EP19790101638
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German (de)
French (fr)
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EP0005818A1 (en
Inventor
Wolfgang Beyer
Peter Graner
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Bosch Rexroth AG
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Mannesmann Rexroth AG
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Publication of EP0005818A1 publication Critical patent/EP0005818A1/en
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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
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves

Definitions

  • the invention relates to a hydraulically operated 3-way seat valve with two switching positions.
  • Directional valves are actuated in a known manner by pilot valves, the directional valve occupying one switching position in the one switching position of the respective pilot valve and the directional valve assuming the other switching position in the other switching position of the pilot valve. So that the directional control valve remains in the respective switching position, it is necessary that the control pressure acts continuously on the control piston side in question. If this control pressure fails due to a fault in the system, the switch position of the directional valve in question is no longer guaranteed.
  • a valve according to the preamble of claim 1 is known.
  • the only pilot valve is operated electromagnetically.
  • the object of the invention is to provide a hydraulically actuated 3-way seat valve with two switch positions, which, regardless of the failure of the control fluid pressure, maintains the switch position once it has been taken, similar to how this is ensured using mechanical catches and at the same time offers the possibility of combining it with one further to create a valve unit that also fulfills the function of a 4-way seat valve, regardless of the control pressure, maintaining its switching position.
  • Fig. 1 denotes a hydraulically operated 3-way seat valve with two switching positions and 2 the other hydraulically operated 3-way seat valve with two switching positions.
  • Each 3-way seat valve has a control piston 3, 4, which has seat surfaces 3a, 3b and 4a, 4b, which interact with corresponding seat surfaces 5a, 5b and 6a, 6b in the housing.
  • Each control piston 3, 4 has cylindrical projections 3c, 3d and 4c, 4d on both sides, which cooperate with housing bores 8, 9 and 10, 11, respectively.
  • the actuating piston 12 is connected to the control piston 4 via a connecting rod 13.
  • the actuating piston 12 has a larger surface 12a and a smaller ring surface 12b.
  • the control chamber 15 delimited by the smaller annular surface 12b is in direct connection with the housing bore 11 which, depending on the switching position of the control piston 4, can be closed or opened by its cylindrical extension 4d.
  • the actuating piston 16 With the cylindrical projection 3d of the closing body 3, the actuating piston 16 is in a non-positive contact via a bolt-shaped extension.
  • the larger surface 16a of the actuating piston 16 delimits the control chamber 17.
  • the control chamber 17 is connected to the control chamber 20 of the control piston 12 via the control line 18.
  • the control chamber 21, delimited by the smaller annular surface 16b of the actuating piston 16, is in direct connection with the housing bore 9.
  • the control chamber 15 of the 3-way seat valve 2 is permanently connected to the pressure medium source 23 via the pressure line 22 and the control chamber 21 of the 3-way seat valve 1 via the tank line 24 to the tank T.
  • the housing bore 8 corresponds to the cylindrical projection 3c of the control piston 3 of the 3-way seat valve 1 cooperates, is connected via the connecting line 26 with the control chamber 15 and thus also with the pressure medium source, so that the cylindrical extension 3c is constantly acted upon by the control medium pressure, so that the closing body 3 in Direction of the control chamber 21 connected to the tank is loaded.
  • the cylindrical extension 3c forms the actuating piston in the direction of the switching position of the control piston 3 shown.
  • the housing bore 10, with which the cylindrical extension 4c of the control piston 4 of the 3-way seat valve 2 interacts, is in permanent connection via the line 27 with the tank line 24 and thus with the tank T.
  • the valve chamber 30 of the 3-way seat valve 1 is connected via line 31 to the working line connection A and the valve chamber 33 of the 3-way seat valve 2 is connected via line 34 to the working line connection B. From the line 34 branches off a control line 35 which opens into the control line 18 via a throttle 36 and is thus connected both to the control chamber 20 of the 3-way seat valve 2 and to the control chamber 17 of the 3-way seat valve 1 .
  • the control rooms 17, 20 are also located via the control line 18 and via the control line sections 18a, 18b with the pilot valve 38 and via the control line 18 and the control line sections 18a, 18c to the pilot valve 39 in connection.
  • the pilot valves 38, 39 are designed as 3-way seat valves with two switching positions a and b.
  • the connection St of the pilot valve 38 is connected via the control line 40 to the control medium source, which is formed by the pressure medium source 23.
  • the junction of the control line 40 into the pressure medium line 22 of the pressure medium source 23 takes place between the pressure medium source 23 and the check valve 41, which is arranged between the pressure medium source 23 and the directional control valve 2.
  • the connection Ta of the pilot valve 38 is connected to the control line 42 leading to the tank.
  • the connection Ta and the connection K of the pilot valve 39 are connected to the control line 42 and thus to the tank T via the control line sections 42a, 42b.
  • the connecting line 35 is connected to the working line 34 with throttle 36 also the control line section 18 and thus also the control rooms 17 and 20 in connection with the tank. Since the control chamber 15 is in permanent connection with the pressure medium source 23, the actuating piston 12 is subjected to a greater force as a result of its larger annular surface 12b compared to the annular surface 4da of the cylindrical extension 4d of the control piston 4 in the direction of the control chamber 20, and thus the switching position shown with certainty guaranteed.
  • the switching position of the control piston 3 shown is also ensured. If the pilot valve 38 is briefly switched from the switching position b to the switching position a, the control line section 18b is connected to the control center line 40 via the check valve 45, so that the control chambers 17 and 20 of the 3-way seat valves are connected via the control line sections 18a, 18b, 18 1 and 2 are acted upon by the control medium pressure.
  • the actuating piston 12 displaces the control piston 4 in the direction of the housing seat surface 6a until the latter has reached the relevant new switching position in which the connection of the valve chamber 33 with the Housing bore 10 prevented and a connection between the valve chamber 33 with the housing bore 11 and valve chamber 15 is made and thus there is a connection of the working port B with the pressure medium source 23.
  • control piston 16 moves the control piston 3 in the direction of the housing seat surface 5a until the latter has reached the switch position in question, in which the connection between the valve chamber 30 and the housing bore 8 is interrupted and therefore the connection of the valve chamber 30 with the housing bore 9 and thus with the space 21 connected to the tank connection T via the tank line 24, so that the work line connection A is connected to the tank connection Tin.
  • the pilot valve 38 can be moved back into the starting position shown.
  • the required control pressure in the control rooms 17 and 20 to ensure the switching position is ensured on the one hand by the fact that the control rooms in the direction of the tank connection Y are closed by the closed pilot valve 39 designed as a seat valve and the check valve 45 arranged in the control line section 18b, and on the other hand via the connecting line 35 with throttle 36 and via the 3-way seat valve 2 there is a connection to the pressure medium connection after the working line connection B is connected to the pressure medium connection P in the new switching position of the 3-way seat valve 2.
  • the control piston 16 of the 3-way seat valve 1 is pressure-balanced, so that the closing body 3 is displaced back in the direction of the switching position shown by the pressure medium acting in the bore 8 on the shoulder 3c.
  • the closing body 4 of the 3-way seat valve 2 in his shifted position shown moved back, by the pressure medium acting in the control chamber 11 and the control piston 12 in the direction of the control chamber 20.
  • the pressure resulting therefrom acts both in the control chamber 11 of the 3-way seat valve 2 and in the valve chamber 30 of the 3-way seat valve 1. Pressure relief in the direction of the pressure medium source 23 is prevented by the check valve 41 in the pressure line 15.
  • the cylindrical lugs 3c, 3d and 4c, 4d of the closing body 3, 4 have such a length that when the closing body 3, 4 is shifted from one to the other switching position, the one cylindrical extension is in operative connection with the relevant housing bore stands until the other cylindrical extension is inserted into the relevant housing bore. This prevents the housing space 30 or 33 from being connected to the pressure medium source and the tank at the same time, that is to say a short-circuit position occurs.
  • Fig. 2 the same reference numerals as in Fig. 1 denote the same parts.
  • the closing bodies 3, 4 are guided in guide bodies 50, 51, which are connected to the valve spaces 30, 33 via transverse bores 52, 53, so that, depending on the switching position of the closing bodies 3, 4, the valve spaces 30 and 33 are connected to the respective ones Housing bores 8, 9 and 10, 11 is guaranteed.
  • the housings for the valves 1 and 2 are formed by a common housing block 55.
  • the dacalethsene- do g s are embedded as channels in this housing block 55th
  • the pilot valves 38, 39 which are designed as solenoid-operated 3-way seat valves with two switching positions, are screwed directly onto the valve housing block 55, so that no pipe connections are required between pilot valves and the 3-way seat valves 1 and 2 forming the main valves.

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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)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft ein hydraulisch betätigtes 3-Wegesitzventil mit zwei Schaltstellungen.The invention relates to a hydraulically operated 3-way seat valve with two switching positions.

In bekannter Weise werden Wegeventile von Vorsteuerventilen angesteuert, wobei in der einen Schaltstellung des betreffenden Vorsteuerventils das Wegeventil die eine Schaltstellung und in der anderen Schaltstellung des Vorsteuerventils das Wegeventil die andere Schaltstellung einnimmt. Damit das Wegeventil jeweils in der betreffenden Schaltstellung verbleibt, ist es erforderlich, daß der Steuerdruck dauernd auf die betreffende Steuerkolbenseite wirkt. Fällt dieser Steuerdruck durch eine Störung in der Anlage aus, ist die betreffende Schaltstellung des Wegeventils nicht mehr gewährleistet.Directional valves are actuated in a known manner by pilot valves, the directional valve occupying one switching position in the one switching position of the respective pilot valve and the directional valve assuming the other switching position in the other switching position of the pilot valve. So that the directional control valve remains in the respective switching position, it is necessary that the control pressure acts continuously on the control piston side in question. If this control pressure fails due to a fault in the system, the switch position of the directional valve in question is no longer guaranteed.

Aus GB-A-685 925 ist ein Ventil nach dem Oberbegriff des Anspruchs 1 bekannt. Das einzige Vorsteuerventil wird elektromagnetisch betätigt.From GB-A-685 925 a valve according to the preamble of claim 1 is known. The only pilot valve is operated electromagnetically.

Die Aufgabe der Erfindung besteht darin, ein hydraulisch betätigtes 3-Wegesitzventil mit zwei Schaltstellungen zu schaffen, das unabhängig vom Ausfall des Steuerflüssigkeitsdruckes die einmal eingenommene Schaltstellung beibehält, ähnlich wie dies unter Verwendung mechanischer Rasten gewährleistet ist und zugleich die Möglichkeit bietet, durch Kombination mit einem weiteren ebenfalls unabhängig vom Steuerdruck seine Schaltstellung beibehaltendes 3-Wegesitzventil eine Ventileinheit zu schaffen, die die Funktion eines 4-Wegesitzventils erfüllt.The object of the invention is to provide a hydraulically actuated 3-way seat valve with two switch positions, which, regardless of the failure of the control fluid pressure, maintains the switch position once it has been taken, similar to how this is ensured using mechanical catches and at the same time offers the possibility of combining it with one further to create a valve unit that also fulfills the function of a 4-way seat valve, regardless of the control pressure, maintaining its switching position.

Nach der Erfindung wird dies mit den kennzeichnenden Merkmalen des Anspruches 1 erreicht.According to the invention this is achieved with the characterizing features of claim 1.

Weitere Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Further refinements of the invention result from the subclaims.

Durch die FR-Patente 1 078 604 und 1 391 950 ist es bei luftgesteuerten 2-Wegesitzventilen bekannt, das Arbeitsmedium zum Halten der jeweiligen Schaltstellung des Schließkörpers heranzuziehen. Diese Ventile bieten jedoch nicht die Möglichkeit, durch Kombination mit einem ähnlich aufgebauten Ventil eine Ventileinheit zu schaffen, die die Funktion eines 4-Wegeventils bietet.From FR patents 1 078 604 and 1 391 950 it is known in air-controlled 2-way seat valves to use the working medium to hold the respective switching position of the closing body. However, these valves do not offer the possibility, by combination with a similarly constructed valve, to create a valve unit which functions as a 4-way valve.

Ein Ausführungsbeispiel der Erfindung ist in Verbindung mit der Zeichnung nachfolgend beschrieben.An embodiment of the invention is described below in connection with the drawing.

Die Zeichnung zeigt in

  • Fig. 1 den schematischen Aufbau eines von zwei 3-Wegeventilen gebildeten 4-Wegeventils und in
  • Fig. 2 den konstruktiven Aufbau des 4-Wegeventils nach Fig. 1.
The drawing shows in
  • Fig. 1 shows the schematic structure of a 4-way valve formed by two 3-way valves and in
  • 2 shows the structural design of the 4-way valve according to FIG. 1.

In Fig. 1 ist mit 1 das eine hydraulisch betätigte 3-Wege-Sitzventil mit zwei Schaltstellungen und mit 2 das andere hydraulisch betätigte 3-Wege- Sitzventil mit zwei Schaltstellungen bezeichnet. Jedes 3-Wege-Sitzventil weist einen Steuerkolben 3, 4 auf, der Sitzflächen 3a, 3b bzw. 4a, 4b aufweist, die mit entsprechenden Sitzflächen 5a, 5b bzw. 6a, 6b im Gehäuse zusammenwirken. Jeder Steuerkolben 3, 4 weist auf beiden Seiten zylindrische Ansätze 3c, 3d bzw. 4c, 4d auf, die mit Gehäusebohrungen 8, 9 bzw. 10, 11 zusammenwirken. Mit dem Steuerkolben 4 ist der Betätigungskolben 12 über eine Verbindungsstange 13 verbunden. Der Betätigungskolben 12 weist eine größere Fläche 12a und eine kleinere Ringfläche 12b auf. Der von der kleineren Ringfläche 12b begrenzte Steuerraum 15 steht in unmittelbarer Verbindung mit der Gehäusebohrung 11, die je nach Schaltstellung des Steuerkolbens 4 von dessen zylindrischen Ansatz 4d zu schließen oder zu öffnen ist.In Fig. 1, 1 denotes a hydraulically operated 3-way seat valve with two switching positions and 2 the other hydraulically operated 3-way seat valve with two switching positions. Each 3-way seat valve has a control piston 3, 4, which has seat surfaces 3a, 3b and 4a, 4b, which interact with corresponding seat surfaces 5a, 5b and 6a, 6b in the housing. Each control piston 3, 4 has cylindrical projections 3c, 3d and 4c, 4d on both sides, which cooperate with housing bores 8, 9 and 10, 11, respectively. The actuating piston 12 is connected to the control piston 4 via a connecting rod 13. The actuating piston 12 has a larger surface 12a and a smaller ring surface 12b. The control chamber 15 delimited by the smaller annular surface 12b is in direct connection with the housing bore 11 which, depending on the switching position of the control piston 4, can be closed or opened by its cylindrical extension 4d.

Mit dem zylindrischen Ansatz 3d des Schließkörpers 3 steht der Betätigungskolben 16 über eine bolzenförmige Verlängerung in kraftschlüssiger Anlage. Die größere Fläche 16a des Betätigungskolbens 16 begrenzt den Steuerraum - 17. Über die Steuerleitung 18 steht der Steuerraum 17 mit dem Steuerraum 20 des Steuerkolbens 12 in Verbindung. Der von der kleineren Ringfläche 16b des Betätigungskolbens 16 begrenzte Steuerraum 21 steht mit der Gehäusebohrung 9 in unmittelbarer Verbindung. Der Steuerraum 15 des 3-Wege-Sitzventils 2 ist über die Druckleitung 22 mit der Druckmittelquelle 23 dauernd verbunden und der Steuerraum 21 des 3-Wege-Sitzventils 1 über die Tankleitung 24 mit dem Tank T. Die Gehäusebohrung 8, die mit dem zylindrischen Ansatz 3c des Steuerkolbens 3 des 3-Wege-Sitzventils 1 zusammenwirkt, steht über die Verbindungsleitung 26 mit dem Steuerraum 15 und damit ebenfalls mit der Druckmittelquelle in dauernder Verbindung, so daß auch der zylindrische Ansatz 3c dauernd vom Steuermitteldruck beaufschlagt ist, wodurch der Schließkörper 3 in Richtung des mit dem Tank in Verbindung stehenden Steuerraumes 21 belastet ist. Der zylindrische Ansatz 3c bildet hierbei den Betätigungskolben in Richtung der gezeigten Schaltstellung des Steuerkolbens 3.With the cylindrical projection 3d of the closing body 3, the actuating piston 16 is in a non-positive contact via a bolt-shaped extension. The larger surface 16a of the actuating piston 16 delimits the control chamber 17. The control chamber 17 is connected to the control chamber 20 of the control piston 12 via the control line 18. The control chamber 21, delimited by the smaller annular surface 16b of the actuating piston 16, is in direct connection with the housing bore 9. The control chamber 15 of the 3-way seat valve 2 is permanently connected to the pressure medium source 23 via the pressure line 22 and the control chamber 21 of the 3-way seat valve 1 via the tank line 24 to the tank T. The housing bore 8 corresponds to the cylindrical projection 3c of the control piston 3 of the 3-way seat valve 1 cooperates, is connected via the connecting line 26 with the control chamber 15 and thus also with the pressure medium source, so that the cylindrical extension 3c is constantly acted upon by the control medium pressure, so that the closing body 3 in Direction of the control chamber 21 connected to the tank is loaded. The cylindrical extension 3c forms the actuating piston in the direction of the switching position of the control piston 3 shown.

Die Gehäusebohrung 10, mit der der zylindrische Ansatz 4c des Stuerkolbens 4 des 3-Wege-Sitzventils 2 zusammenwirkt, steht über die Leitung 27 mit der Tankleitung 24 und damit mit dem Tank T in dauernder Verbindung. Der Ventilraum 30 des 3-Wege-Sitzventils 1 steht über die Leitung 31 mit dem Arbeitsleitungsanschluß A und der Ventilraum 33 des 3-Wege- Sitzventils 2 steht über die Leitung 34 mit dem Arbeitsleitungsanschluß B in Verbindung. Von der Leitung 34 zweigt eine Steuerleitung 35 ab, die über eine Drosselstelle 36 in die Steuerleitung 18 mündet und damit sowohl mit dem Steuerraum 20 des 3-Wege-Sitzventils 2 als auch mit dem Steuerraum 17 des 3-Wege-Sitzventils 1 in Verbindung steht.The housing bore 10, with which the cylindrical extension 4c of the control piston 4 of the 3-way seat valve 2 interacts, is in permanent connection via the line 27 with the tank line 24 and thus with the tank T. The valve chamber 30 of the 3-way seat valve 1 is connected via line 31 to the working line connection A and the valve chamber 33 of the 3-way seat valve 2 is connected via line 34 to the working line connection B. From the line 34 branches off a control line 35 which opens into the control line 18 via a throttle 36 and is thus connected both to the control chamber 20 of the 3-way seat valve 2 and to the control chamber 17 of the 3-way seat valve 1 .

Die Steuerräume 17, 20 stehen ferner über die Steuerleitung 18 sowie über die Steuerleitungsabschnitte 18a, 18b mit dem Vorsteuerventil 38 und über die Steuerleitung 18 sowie über die Steuerleitungsabschnitte 18a, 18c mit dem Vorsteuerventil 39 in Verbindung. Die Vorsteuerventile 38, 39 sind als 3-Wege-Sitzventile mit zwei Schaltstellungen a und b ausgebildet. Der Anschluß St des Vorsteuerventils 38 steht über die Steuerleitung 40 mit der Steuermittelquelle in Verbindung, die von der Druckmittelquelle23 gebildet wird. Die Einmündungsstelle der Steuerleitung 40 in die Druckmittelleitung 22 der Druckmittelquelle 23 erfolgt zwischen der Druckmittelquelle 23 und dem Rückschlagventil 41, das zwischen Druckmittelquelle 23 und Wegeventil 2 angeordnet ist. Der Anschluß Ta des Vorsteuerventils 38 steht mit der zum Tank führenden Steuerleitung 42 in Verbindung. Ebenso steht der Anschluß Ta und der Anschluß K des Vorsteuerventils 39 über die Steuerleitungsabschnitte 42a, 42b mit der Steuerleitung 42 und damit mit dem Tank T in Verbindung.The control rooms 17, 20 are also located via the control line 18 and via the control line sections 18a, 18b with the pilot valve 38 and via the control line 18 and the control line sections 18a, 18c to the pilot valve 39 in connection. The pilot valves 38, 39 are designed as 3-way seat valves with two switching positions a and b. The connection St of the pilot valve 38 is connected via the control line 40 to the control medium source, which is formed by the pressure medium source 23. The junction of the control line 40 into the pressure medium line 22 of the pressure medium source 23 takes place between the pressure medium source 23 and the check valve 41, which is arranged between the pressure medium source 23 and the directional control valve 2. The connection Ta of the pilot valve 38 is connected to the control line 42 leading to the tank. Likewise, the connection Ta and the connection K of the pilot valve 39 are connected to the control line 42 and thus to the tank T via the control line sections 42a, 42b.

In der gezeigten Schaltstellung b des Vorsteuerventils 38 ist eine Verbindung der beiden Steuerräume 17, 20 der 3-Wege-Sitzventile 1 und 2 durch das Rückschlagventil 45 im Steuerleitungsabschnitt 18b in Richtung des Tankes unterbunden, ebenso durch die Schaltstellung b des Vorsteuerventils 39, in der der Anschluß St, mit dem der Steuerleitungsanschluß 18c verbunden ist, geschlossen ist.In the switching position b of the pilot valve 38 shown, a connection of the two control spaces 17, 20 of the 3-way seat valves 1 and 2 is prevented by the check valve 45 in the control line section 18b in the direction of the tank, and likewise by the switching position b of the pilot valve 39, in which the connection St, to which the control line connection 18c is connected, is closed.

In der gezeigten Schaltstellung des 3-Wege- Sitzventils 2, in der der Ventilraum 33 über die Gehäusebohrung 10 sowie über die Leitung 27 mit der Tankleitung 24 in Verbindung steht und damit auch die Arbeitsleitung 34, steht über die mit der Arbeitsleitung 34 verbundene Verbindungsleitung 35 mit Drosselstelle 36 auch der Steuerleitungsabschnitt 18 und damit auch die Steuerräume 17 und 20 mit dem Tank in Verbindung. Da der Steuerraum 15 mit der Druckmittelquelle 23 in dauernder Verbindung steht, wird der Betätigungskolben 12 infolge dessen größeren Ringfläche 12b gegenüber der Ringfläche 4da des zylindrischen Ansatzes 4d des Steuerkolbens 4 in Richtung des Steuerraumes 20 von einer größeren Kraft belastet und damit die gezeigte Schaltstellung mit Sicherheit gewährleistet. Da über die Verbindungsleitung 26 auch die Gehäusebohrung 8 und damit auch der zylindrische Ansatz 3c vom Druck der Druckmittelquelle dauernd beaufschlagt ist und sowohl der Raum 21 als auch der Steuerraum 17 mit dem Tank in Verbindung stehen, so daß der Betätigungskolben 16 druckausgeglichen und damit keine Kraft ausüben kann, ist die gezeigte Schaltstellung des Steuerkolbens 3 ebenfalls sichergestellt. Wird das Vorsteuerventil 38 kurzzeitig aus der Schaltstellung b in die Schaltstellung a geschaltet, wird der Steuerleitungsabschnitt 18b über das Rückschlagventil 45 mit der Steuermittelleitung 40 verbunden, so daß über die Steuerleitungsabschnitte 18a, 18b, 18 die Steuerräume 17 und 20 der 3-Wege-Sitzventile 1 und 2 vom Steuermitteldruck beaufschlagt werden. Da die druckbeaufschlagte Fläche 12a des Betätigungskolbens 12 größer ist als die dauernd unter dem Druckmittel stehende Ringfläche 12b, verschiebt der Betätigungskolben 12 den Steuerkolben 4 in Richtung der Gehäusesitzfläche 6a bis letzterer die betreffende neue Schaltstellung erreicht hat, in der die Verbindung des Ventilraumes 33 mit der Gehäusebohrung 10 unterbunden und eine Verbindung zwischen dem Ventilraum 33 mit der Gehäusebohrung 11 und Ventilraum 15 hergestellt ist und damit eine Verbindung des Arbeitsanschlusses B mit der Druckmittelquelle 23 besteht. Durch die gleichzeitige Steuerdruckmittelbeaufschlagung des Steuerraumes 17 verschiebt der Steuerkolben 16 den Steuerkolben 3 in Richtung der Gehäusesitzfläche 5a bis letzterer die betreffende Schaltstellung erreicht hat, in der die Verbindung zwischen dem Ventilraum 30 und der Gehäusebohrung 8 unterbrochen und dafür die Verbindung des Ventilraumes 30 mit der Gehäusebohrung 9 und damit mit dem über die Tankleitung 24 mit dem Tankanschluß T verbundenen Raum 21 hergestellt ist, so daß der Arbeitsieitungsanschtuß A mit dem Tankanschluß Tin Verbindung steht.In the switching position of the 3-way seat valve 2 shown, in which the valve chamber 33 is connected to the tank line 24 via the housing bore 10 and via the line 27 and thus also the working line 34, the connecting line 35 is connected to the working line 34 with throttle 36 also the control line section 18 and thus also the control rooms 17 and 20 in connection with the tank. Since the control chamber 15 is in permanent connection with the pressure medium source 23, the actuating piston 12 is subjected to a greater force as a result of its larger annular surface 12b compared to the annular surface 4da of the cylindrical extension 4d of the control piston 4 in the direction of the control chamber 20, and thus the switching position shown with certainty guaranteed. Since the housing bore 8 and thus also the cylindrical extension 3c is continuously acted upon by the pressure of the pressure medium source via the connecting line 26 and both the space 21 and the control space 17 are connected to the tank, so that the actuating piston 16 is pressure-balanced and therefore no force can exercise, the switching position of the control piston 3 shown is also ensured. If the pilot valve 38 is briefly switched from the switching position b to the switching position a, the control line section 18b is connected to the control center line 40 via the check valve 45, so that the control chambers 17 and 20 of the 3-way seat valves are connected via the control line sections 18a, 18b, 18 1 and 2 are acted upon by the control medium pressure. Since the pressurized surface 12a of the actuating piston 12 is larger than the annular surface 12b which is permanently under the pressure medium, the actuating piston 12 displaces the control piston 4 in the direction of the housing seat surface 6a until the latter has reached the relevant new switching position in which the connection of the valve chamber 33 with the Housing bore 10 prevented and a connection between the valve chamber 33 with the housing bore 11 and valve chamber 15 is made and thus there is a connection of the working port B with the pressure medium source 23. Due to the simultaneous application of control pressure medium to the control chamber 17, the control piston 16 moves the control piston 3 in the direction of the housing seat surface 5a until the latter has reached the switch position in question, in which the connection between the valve chamber 30 and the housing bore 8 is interrupted and therefore the connection of the valve chamber 30 with the housing bore 9 and thus with the space 21 connected to the tank connection T via the tank line 24, so that the work line connection A is connected to the tank connection Tin.

Sobald die Steuerkolben 3 bzw. 4 diese neue Schaltstellung eingenommen haben, kann das Vorsteuerventil 38 wieder in die gezeigte Ausgangsstellung zurück verschoben werden. Der erforderliche Steuerdruck in den Steuerräumen 17 und 20 zur Sicherstellung der Schaltstellung wird zum einen dadurch gewährleistet, daß die Steuerräume in Richtung des Tankanschlusses Y durch das als Sitzventil ausgebildete geschlossene Vorsteuerventil 39 und das im Steuerleitungsabschnitt 18b angeordnete Rückschlagventil 45 leckölfrei abgeschlossen sind und zum anderen über die Verbindungsleitung 35 mit Drosselstelle 36 und über das 3-Wegesitzventil 2 eine Verbindung zum Druckmittelanschluß besteht, nachdem in der neuen Schaltstellung des 3-Wege-Sitzventils 2 der Arbeitsieitungsanschluß B mit dem Druckmittelanschluß P verbunden ist. Sollte durch eine Betriebsstörung die Druckmittelquelle 23 außer Betrieb gesetzt sein, kann sich der Druck durch das zwischengeschaltete Rückschlagventil 41 in der Druckleitung 22 im Ventilraum 33 nicht abbauen, so daß nach wie vor der erforderliche Steuerdruck zur Aufrechterhaltung der neuen Schaltstellung sichergestellt ist, insbesondere, wenn am mit dem Verbraucheranschluß B in Wirkverbindung stehenden Verbraucher eine äußere Last wirkt, die als Druck im Arbeitsleitungsanschluß B wirksam ist.As soon as the control pistons 3 and 4 have assumed this new switching position, the pilot valve 38 can be moved back into the starting position shown. The required control pressure in the control rooms 17 and 20 to ensure the switching position is ensured on the one hand by the fact that the control rooms in the direction of the tank connection Y are closed by the closed pilot valve 39 designed as a seat valve and the check valve 45 arranged in the control line section 18b, and on the other hand via the connecting line 35 with throttle 36 and via the 3-way seat valve 2 there is a connection to the pressure medium connection after the working line connection B is connected to the pressure medium connection P in the new switching position of the 3-way seat valve 2. Should the pressure medium source 23 be put out of operation due to a malfunction, the pressure cannot drop through the intermediate check valve 41 in the pressure line 22 in the valve chamber 33, so that the control pressure required to maintain the new switching position is still ensured, especially if an external load acts on the consumer in operative connection with the consumer connection B, which acts as a pressure in the working line connection B.

Wird das Vorsteuerventil 39 kurzzeitig aus der Ausgangsschaltstellung b in die Schaltstellung a verschoben, werden über dessen Anschluß K die Steuerräume 17 und 20 mit dem Tankanschluß verbunden. Dadurch ist der Steuerkolben 16 des 3-Wege-Sitzventils 1 druckausgeglichen, so daß der Schließkörper 3 durch das in der Bohrung 8 wirkende den Ansatz 3c beaufschlagende Druckmittel in Richtung seiner gezeigten Schaltstellung zurück verschoben wird. Ebenso wird der Schließkörper 4 des 3-Wege-Sitzventils 2 in seine gezeigte Schaltstellung zurückverschoben, durch das im Steuerraum 11 wirkende den Steuerkolben 12 in Richtung des Steuerraumes 20 beaufschlagende Druckmittel. Wird das Vorsteuerventil 39 wieder in die gezeigte Ausgangsschaltstellung b zurückgestellt, bleiben die Steuerräume 17,20 nach wie vor mit dem Tankanschluß in Verbindung, da in der gezeigten Schaltstellung des 3-Wege-Sitzventils 2 der Ventilraum 33 mit dem Tankanschluß in Verbindung steht und damit über die Verbindungsleitung 35 mit Drosselstelle 36 auch die Steuerräume 17 und 20. Sollte in dieser Schaltstellung der 3-Wege-Sitzventile die Druckmittelquelle 23 durch eine Störung außer Betrieb gesetzt werden, bleibt der zur Aufrechterhaltung der Schaltstellung oder Schließkörper erforderliche Steuerdruck erhalten, wenn am mit dem Arbeitsleitungsanschluß A verbundenen Verbraucher eine äußere Last angreift.If the pilot valve 39 is briefly shifted from the initial switch position b to the switch position a, the control chambers 17 and 20 are connected to the tank connection via the connection K thereof. As a result, the control piston 16 of the 3-way seat valve 1 is pressure-balanced, so that the closing body 3 is displaced back in the direction of the switching position shown by the pressure medium acting in the bore 8 on the shoulder 3c. Likewise, the closing body 4 of the 3-way seat valve 2 in his shifted position shown moved back, by the pressure medium acting in the control chamber 11 and the control piston 12 in the direction of the control chamber 20. If the pilot valve 39 is returned to the initial switch position b shown, the control chambers 17, 20 remain in connection with the tank connection, since in the switch position of the 3-way seat valve 2 shown, the valve chamber 33 is connected to the tank connection and thus Via the connecting line 35 with throttle 36 also the control rooms 17 and 20. Should the pressure medium source 23 be put out of operation by a fault in this switching position of the 3-way seat valves, the control pressure required to maintain the switching position or closing body is maintained if on with the consumer connected to the working line connection A attacks an external load.

Der daraus sich ergebende Druck wirkt sowohl im Steuerraum 11 des 3-Wege-Sitzventils 2 als auch im Ventilraum 30 des 3-Wege-Sitzventils 1. Eine Druckentlastung in Richtung der Druckmittelquelle 23 wird durch das Rückschlagventil 41 in der Druckleitung 15 unterbunden.The pressure resulting therefrom acts both in the control chamber 11 of the 3-way seat valve 2 and in the valve chamber 30 of the 3-way seat valve 1. Pressure relief in the direction of the pressure medium source 23 is prevented by the check valve 41 in the pressure line 15.

Die zylindrischen Ansätze 3c, 3d bzw. 4c, 4d der Schließkörper 3,4 weisen eine solche Länge auf, daß bei einer Verschiebung der Schließkörper 3, 4 aus der einen in die andere Schaltstellung der eine zylindrische Ansatz so lange mit der betreffenden Gehäusebohrung in Wirkverbindung steht, bis der andere zylindrische Ansatz in die betreffende Gehäusebohrung eingefahren ist. Damit wird verhindert, daß der Gehäuseraum 30 bzw. 33 gleichzeitig mit der Druckmittelquelle und dem Tank in Verbindung steht, also eine Kurzschlußstellung auftritt.The cylindrical lugs 3c, 3d and 4c, 4d of the closing body 3, 4 have such a length that when the closing body 3, 4 is shifted from one to the other switching position, the one cylindrical extension is in operative connection with the relevant housing bore stands until the other cylindrical extension is inserted into the relevant housing bore. This prevents the housing space 30 or 33 from being connected to the pressure medium source and the tank at the same time, that is to say a short-circuit position occurs.

In Fig. 2 sind mit den gleichen Bezugszeichen wie in Fig. 1 die gleichen Teile bezeichnet. Die Schließkörper 3,4 sind in Führungskörpern 50, 51 geführt, die über Querbohrungen 52, 53 mit den Ventilräumen 30, 33 in Verbindung stehen, so daß je nach Schaltstellung der Schließkörper 3,4 eine Verbindung der Ventilräume 30 bzw. 33 mit den betreffenden Gehäusebohrungen 8, 9 bzw. 10, 11 gewährleiset ist. Die Gehäuse für die Ventile 1 und 2 werden von einem gemeinsamen Gehäuseblock 55 gebildet. Die Verbindungslei- tungen sind als Kanäle in diesem Gehäuseblock 55 eingelassen. Die Vorsteuerventile 38, 39, die als magnetbetätigte 3-Wege-Sitzventile mit zwei Schaltstellungen ausgebildet sind, sind unmittelbar am Ventilgehäuseblock 55 aufgeschraubt, so daß zwischen Vorsteuerventilen und den die Hauptventile bildenden 3-Wege-Sitzventilen 1 und 2 keine Rohrverbindungen erforderlich sind.In Fig. 2 the same reference numerals as in Fig. 1 denote the same parts. The closing bodies 3, 4 are guided in guide bodies 50, 51, which are connected to the valve spaces 30, 33 via transverse bores 52, 53, so that, depending on the switching position of the closing bodies 3, 4, the valve spaces 30 and 33 are connected to the respective ones Housing bores 8, 9 and 10, 11 is guaranteed. The housings for the valves 1 and 2 are formed by a common housing block 55. The Verbindungslei- do g s are embedded as channels in this housing block 55th The pilot valves 38, 39, which are designed as solenoid-operated 3-way seat valves with two switching positions, are screwed directly onto the valve housing block 55, so that no pipe connections are required between pilot valves and the 3-way seat valves 1 and 2 forming the main valves.

Claims (5)

1. Hydraulically actuated 3-way seat valve with two switching positions, which has an actuating piston (12), which is functionally connected to the control piston (4), that area (12a) of the actuating piston, which is to be subjected to the control pressure and acts in one switching direction, having a greater effective area than that area (12b) of the said piston, which is to be subjected to the control pressure and acts in the other switching direction, the smaller effective area (12b) having to be continuously subjected to the control pressure (23), and the larger effective area (12a) having to be subjected either to the control pressure or to the tank pressure, characterised by two pilot valves (38, 39), which are designed as 3-way seat valves with two switching positions (a, b), of which one pilot valve (39) controls the connection of the control chamber (20) containing the larger actuating-piston area (12a) to the tank (T), whilst the other pilot valve (38) controls the connection of this control chamber (20), via a non-return valve (45), to the source (23) of the control medium, this control chamber (20) being connected, via a restriction (36), to the consumer-connection (B) of the main valve.
2. Hydraulically actuated 3-way seat valve according to Claim 1, characterised in that the actuating piston (12), which is functionally connected to the control piston (4), is rigidly connected to the said piston, and that effective area (12b) of the actuating piston, which faces towards the control piston (4), is smaller than the effective area (12a) which faces away from the control piston (4).
3. Hydraulically actuated 3-way seat valve, designed with a positive switching-overlap, according to Claims 1 and 2, the positive switching-overlap being formed by means of cylindrical extensions (4c, 4d), which are located at both ends of the control piston (4) and interact with holes in the housing which carry working fluig, characterised in that one hole (11) in the housing, which communicates with the pump- connection (P) and unteracts with one cylindrical extension (4d) of the control piston (4), is in direct communication with the control chamber (15) which is bounded by the smaller area (12b) of the actuating piston (12).
4. Hydraulically actuated 3-way seat valve according to Claim 1, characterised by the combination with an additional hydraulically actuated 3-way seat valve (1) having a positive switching-overlap, which is formed by cylindrical extensions which are located at both end's of the control piston, a cylindrical extension (3c), which is subjected to the pump pressure, simultaneously forming the actuating piston with the smaller effective area. and the actuating piston (16) having the larger effective area (16a) being designed as an independent part which is frictionally connected to the control piston (3), via a bolt-shaped prolongation (16c). and the space (9) between the actuating piston (16) and the other cylindrical extension (3d) of the control piston being connected to the tank, and that control chamber (17) of the actuating piston (t6). which faces away from this space (9), being connected to the consumer-connection (3) of the first 3-way seat valve (2), via a restriction (36).
5. Hydraulically actuated 3-way seat valve having control fluid which is formed by the working fluid, according to one or several of the preceding Claims, characterised in that a non-return valve (41) is located between the source (23) of the pressure medium and the directional valve (1, 2), it being possible to lead off the control fluid between the source of the pressure medium and the non-return valve.
EP19790101638 1978-06-03 1979-05-29 Hydraulically operated 3-way seat valve Expired EP0005818B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782824461 DE2824461C2 (en) 1978-06-03 1978-06-03 Pressure medium control device for a consumer that can be acted upon on both sides
DE2824461 1978-06-03

Publications (2)

Publication Number Publication Date
EP0005818A1 EP0005818A1 (en) 1979-12-12
EP0005818B1 true EP0005818B1 (en) 1981-11-25

Family

ID=6040979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790101638 Expired EP0005818B1 (en) 1978-06-03 1979-05-29 Hydraulically operated 3-way seat valve

Country Status (2)

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EP (1) EP0005818B1 (en)
DE (1) DE2824461C2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3102505A1 (en) * 1981-01-27 1982-08-19 Robert Bosch Gmbh, 7000 Stuttgart Control device for a hydraulic work unit
CN109296816B (en) * 2018-11-28 2023-12-01 陕西航天泵阀科技集团有限公司 Mechanical switching dispensing device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7704002U1 (en) * 1900-01-01 Kugelfischer Georg Schaefer & Co, 8720 Schweinfurt
GB685925A (en) * 1949-10-07 1953-01-14 Electro Hydraulics Ltd Improvements in or relating to valve devices
FR1078604A (en) * 1953-04-02 1954-11-19 Lecq Et Cie Soc Pneumatic switching on and off
US3318331A (en) * 1964-01-18 1967-05-09 W E & F Control valve for high pressure hydraulic cylinders and the like
FR1391950A (en) * 1964-01-29 1965-03-12 Merlin Gerin Hydropneumatic control device, in particular for electrical circuit breakers
US3646968A (en) * 1970-09-30 1972-03-07 Sperry Rand Corp Power transmission valve with detent
FR2116863A5 (en) * 1970-12-10 1972-07-21 Gratzmuller Jean Louis TWO-WAY HYDRAULIC CONTROL
DE2632547A1 (en) * 1976-07-20 1978-01-26 Helmut Prof Dipl Ing Kampmann Multi-way valve for high pressure fluids - is four way valve with metal valve seats for controlling double acting hydraulic pistons

Also Published As

Publication number Publication date
EP0005818A1 (en) 1979-12-12
DE2824461C2 (en) 1986-12-11
DE2824461A1 (en) 1979-12-06

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