EP0139259B1 - Valve for the command of fluid flow between a pump, a fluid reservoir and a double acting hydraulic device - Google Patents

Valve for the command of fluid flow between a pump, a fluid reservoir and a double acting hydraulic device Download PDF

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Publication number
EP0139259B1
EP0139259B1 EP84111742A EP84111742A EP0139259B1 EP 0139259 B1 EP0139259 B1 EP 0139259B1 EP 84111742 A EP84111742 A EP 84111742A EP 84111742 A EP84111742 A EP 84111742A EP 0139259 B1 EP0139259 B1 EP 0139259B1
Authority
EP
European Patent Office
Prior art keywords
valve
bore
pilot
fact
per
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84111742A
Other languages
German (de)
French (fr)
Other versions
EP0139259A1 (en
Inventor
Kenneth Dee Kramer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deere and Co
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Deere and Co
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Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Priority to AT84111742T priority Critical patent/ATE33877T1/en
Publication of EP0139259A1 publication Critical patent/EP0139259A1/en
Application granted granted Critical
Publication of EP0139259B1 publication Critical patent/EP0139259B1/en
Expired legal-status Critical Current

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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
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87193—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
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87193—Pilot-actuated
    • Y10T137/87209—Electric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87217—Motor
    • Y10T137/87225—Fluid motor

Definitions

  • the invention relates to a valve for controlling the fluid connection between a pump, a collecting container and a consumer which can be acted upon from both sides.
  • valve bore in the housing of the valve are a valve bore, at least one inlet connecting the pump to the valve bore, an outlet connecting the valve bore to the reservoir, two connecting the valve bore to the work spaces of the consumer Working channels and a first and a second pressure-dependent, displaceable valve part are provided in the valve bore.
  • the area between the two valve parts is pressurized by the pump, causing the left and right spring-loaded cone valves to be lifted from their seats and a line with one side of the consumer and the pump and another line with the other side of the consumer and with the collecting container get connected.
  • Which of the two lines is connected to the pump and to the collecting tank depends on the position of a control slide, which can take four different positions, which serve to keep the consumer in a floating position, in which both sides of the consumer with the collecting tank are connected and in which the pump pressurizes the area between the valve parts, in each case to connect one side of the consumer to the pump and the other side of the consumer to the collecting container and to do this, both sides of the consumer and also the area between the two valve parts to the Connect the collecting container. In the last position, the consumer piston is blocked. With this combination, the desired function can be achieved, but this requires the control slide, which is an additional component and is susceptible to failure due to possible contamination in the liquid. Adjusting it in four different positions means additional effort.
  • EP-A-0 103 250 which is only to be taken into account with regard to the novelty, has already disclosed a valve in which the control slide has been dispensed with and in which two solenoid valves are used for actuation.
  • This valve also works with two valve parts, which act on cone valves in the opening sense in order to connect the non-pressurized side of the consumer to the collection container. This valve cannot be operated so that the piston in the consumer goes into the floating position.
  • valve for controlling the fluid connection between a pump, a collecting container and a consumer that can be acted on from both sides
  • a manual and a remote control are provided, via which two valve bodies each act on one side of the consumer a neutral position, in which the inflow to and the outflow from the consumer is blocked, can be shifted in a direction in which one side of the consumer is connected to the pump and the other side of the consumer is connected to the collecting container.
  • the valve body is shifted from the neutral position in the opposite direction, the other side of the consumer is connected to the pump and, accordingly, the previously pressurized side of the consumer is connected to the collection container.
  • an inlet leading to the pump, two working channels leading to the consumer and two outlets leading to a collecting container are provided, each of which opens into a valve bore.
  • two valve bodies are displaceable, both of which are under the action of a spring which wants to move one valve body into an end position in which the inflow is interrupted by the pump, while the other spring acts on the second valve body in such a way that it is to be moved into its position connecting the working cylinder with the collecting container. So this valve body must be kept in the neutral position against the action of its spring via the manual or remote control.
  • valve bodies themselves are of complex construction, with two valve sealing surfaces each forming in the area of the inner bores provided in them. In addition, no floating position of the consumer can be achieved with this valve.
  • the object to be achieved with the invention is seen in providing an easy-to-control valve that can perform four functions.
  • valve for controlling the fluid connection between a pump, a collecting container and a consumer which can be acted on from both sides, a valve bore, at least one inlet connecting the pump to the valve bore, and the valve bore to the valve housing in the valve housing Outlet connecting connecting container, two working channels connecting the valve bore with the work spaces of the consumer and in the valve bore a first and a second pressure-dependent, displaceable valve part are provided, in the valve bore a first cone seat valve, the spring-loaded valve body of which rests a first in the neutral position against the first valve part Valve sealing surface for controlling the fluid connection between the outlet and the first working channel and a second in the neutral position against a housing shoulder of the valve bore valve sealing surface for controlling the fluid connection between the inlet and the first working channel, and a second conical seat valve are displaceable, the spring-loaded valve body having a third valve sealing surface in the neutral position against the second valve part for controlling the fluid connection between the outlet and the second working channel and a fourth valve sealing surface in the
  • an additional control spool can be dispensed with, since the pilot pressure generator integrated in the valve can initially achieve three functions, namely blocking the liquid in the workrooms of the consumer when both pilot pressure generators are at rest, and a second function when one of the two pilot pressure generators is actuated, whereby one work space of the consumer is connected to the pump and the other work space is connected to the collecting container.
  • the third function in which the other working space is connected to the pump and the first working space is connected to the collecting container, is achieved when the other pilot pressure generator is actuated and the previously actuated one is returned to its rest or starting position.
  • a fourth function in which the piston of the consumer is in a floating position, is given in a simple manner when both pilot pressure generators are operated together.
  • each valve part is provided with a through hole extending in its longitudinal axis
  • the fluid connection between the outlet and each working channel or both working channels takes place through the through holes, if the valve part or parts of the associated Valve sealing surface of the first or second cone seat valve or both is free. This allows the backflow from the non-pressurized work space of the consumer to be directed in a simple manner to the only outlet leading to the collecting container.
  • a pressing force between the first and second valve part is a spring that pushes apart, it is achieved that the movement of one valve part is resiliently transmitted to the other valve part and the connection to the outlet is always maintained.
  • the single spring presses the valve parts against the cone seat valves when the pilot pressure generators are not actuated, so that in the rest position the first and third valve sealing surfaces are closed and the liquid is prevented from escaping from the work spaces of the consumer.
  • each valve part is provided with a hollow flange and a hollow shaft and the housing in the region of its valve bore is provided with an annular space for receiving the flanges and a cylinder space into which the working channels and the inlet open and which each have a bore are connected to the annular space, which is in communication with the outlet
  • the outlet can open into the central part of the annular spaces and in the cylinder spaces the conical seat valves and the hollow shafts can be sealingly displaceable in the bores
  • each flange and each hollow shaft with the housing interacts to form a pilot room, each of which is connected to one of the pilot pressure generators.
  • each valve part can be provided with a drainage orifice which connects its pilot space to the annular space.
  • the pressure in the pilot space can simply decrease, which means returning the valve parts to the starting position in the case of non-actuated pilot pressure generators and, in the case of an actuated pilot pressure generator, a sensitive opening of the corresponding valve sealing surface dependent on the orifice opening.
  • Each pilot pressure generator can expediently have a pilot channel connected to the respective pilot space and a solenoid-controlled valve, via which the inflow into the pilot spaces can be controlled.
  • the first and third are advantageous Valve sealing surface of the poppet valves can be brought into contact with the end of the associated hollow shaft of the valve parts.
  • each inlet and each working channel are connected to the associated cylinder space via a channel, each cylinder space being offset and forming the housing shoulder in this area, furthermore each cone seat valve can be offset and configured such that there is a fluid connection between allows the channels when the second or fourth valve sealing surface is free from the housing shoulder, each cylinder space having a pilot opening which is permanently connected to the inlet or inlets and which can be closed by means of one of the solenoid-controlled valves.
  • At least the second and fourth valve sealing surfaces of the cone seat valve should also be conical.
  • valve parts and cone seat valves can be movable relative to one another at a back pressure coming from the consumer, so that the first or third valve sealing surface is free. This creates a connection to the collection container, so that additional pressure relief valves can be dispensed with.
  • the ends of the hollow shafts can have a larger diameter than the pins of the stepped conical seat valves, which have first and third valve sealing surfaces.
  • Each cylinder chamber can expediently have a section with a diameter that corresponds to that of the bore and a section with a larger diameter that is separated by the housing shoulder.
  • the valve 10 can be actuated electro-hydraulically and controls the fluid connection between two work spaces 12 and 14 of a consumer 16 in the form of a double-acting cylinder and a pump 18 and a collecting container 20.
  • the valve 10 is essentially formed from two mirror-image halves, so that only one page, the right one, needs to be described in detail. Identical parts on the left-hand side are provided with the same reference symbols and comma in the claims and are only provided with reference symbols in the drawing if this is necessary for better understanding.
  • the valve 10 has a housing 22 with two inlets 24, 24 ′ which conduct liquid from the pump 18 to a valve bore 26 which is provided in the housing 22. Likewise, an outlet 28 is incorporated in the housing 22, which connects the central part of the valve bore 26 to the collecting container 20. Two working channels 30, 30 ′ serve to connect the valve bore 26 and the working spaces 12 and 14 of the consumer 16.
  • valve bore 26 The two ends of the valve bore 26 are closed by pilot pressure generator 34, which will be explained in more detail below.
  • a simple fastening can be done by screwing and in the valve bore 26 housing cartridges 36 are inserted, which are screwed to housing parts 37 of the pilot pressure generator.
  • Each housing cartridge 36 is drilled out in stages so that a bore 40 and an annular space 42 are formed in the cylinder space 38.
  • the annular space 42 has the largest diameter. It is followed by the bore 40 with a relatively small diameter and the cylinder space 38, which initially has a diameter corresponding to the bore 40 and then merges into a part of a larger diameter.
  • 36 channels 44 and 46 and a pilot channel 48 are incorporated into each housing cartridge.
  • the channel 46 connects the working channel 30 with the cylinder space 38 in the area in which it has a diameter corresponding to the bore 40, while the channel 44 connects the inlet 24 with the cylinder space 38 in its area with the larger diameter.
  • the pilot channel 48 establishes a connection between the annular space 42 and a chamber 50, which is formed by one end of the housing cartridge 36 and the opposite part of the housing part 37 of the pilot pressure generator 34.
  • a valve piece 52 is inserted into the chamber 50 and is sealingly connected to one end of the housing cartridge 36 via an O-ring 54.
  • the valve piece 52 closes the cylinder space 38 at one end and has a pilot opening 56 which can be sealed by the valve sealing surface of a valve 58.
  • the valve 58 is part of the pilot pressure generator 34 and is permanently connected to an armature 60 which can be moved via a coil 62 and is under the action of a spring 63 which presses the valve 58 in the direction of the pilot opening 56.
  • the coil 62 can be electrically excited, the pilot opening 56 being free of the valve 58. This controls the valve 58 or the pilot pressure generator 34 solenoid
  • a hollow valve part 64 is inserted, which has a hollow cylindrical flange 66, which is sealingly and displaceably in the annular space 42 and merges into an axially extending hollow shaft 67, which in turn extends from the bore 40 can be sealed and moved.
  • the valve part 64 is in its neutral position with the bottom of its flange 66 not against the bottom of the annular space 42, so that part of the hollow shaft 67 protrudes from the bore 40 and a pilot space 68 is formed between the valve part 64 and the housing cartridge is connected to the chamber 50 via the pilot channel 48.
  • a drainage aperture 70 In the bottom of the flange 66 is a drainage aperture 70 with a small diameter
  • valve parts 64, 64 'located in the area of the outlet 28 in the neutral position with their open sides at a distance from one another are pressed apart by a single, centrally arranged spring 74.
  • a Kegesitzventil 80 is also slidably inserted in the housing cartridge in the region of the cylinder space 38. Specifically, it consists of a valve body 82 with a valve sealing surface designed as a cone, which is referred to as a second valve sealing surface 84 for the right valve half and as a fourth valve sealing surface 84 'for the left valve half.
  • the valve sealing surface merges into a pin 86, which also has a conical valve sealing surface at the end, which can be referred to as the first valve sealing surface 87 for the right valve half and as the third valve sealing surface 87 'for the left valve half.
  • valve sealing surface 87 and 87 ' can bear sealingly against the ends of the hollow shafts 67, whereas the valve sealing surface 84, 84' can sealingly bear against a respective housing shoulder which is formed in the part of the cylinder space 38 in which the diameter of the bore 40 corresponding part merges into the part with the larger diameter.
  • the housing shoulder is designated 89 'for the right valve half and 89' for the left valve half.
  • Valve body 82 and pin 86 have a smaller diameter than the parts of the cylinder space 38 which receive them, so that the pin 86 has a smaller diameter than the bore 40 or the outer diameter of the hollow shaft 67, as a result of which an annular surface remains on the hollow shaft Back pressure from the consumer 16 can be exposed.
  • the pins 86 and valve body 82 can also be designed differently. However, it must be ensured that a liquid connection from the channel 44 to the channel 46 is possible with free valve sealing surfaces 84, 84 'and that the liquid can reach the pilot opening 56 from the channel.
  • An annular flange 90 connected to the cone seat valve 80 is arranged to be displaceable in the part of the cylinder space 38 with the larger diameter next to the cone seat valve and is under the action of a spring.
  • the right spring is designated 92 and the spring on the left valve half is designated 92 '.
  • the ring flange 90 is also to be designed such that a connection from the channel 40 to the pilot opening 56 is always possible, which can be done, for example, by milled longitudinal grooves, which are not shown in the drawing.
  • valve sealing surfaces 84 'and 87, 87' are closed, so that no liquid can be conveyed to the working channels 30, 30 'by the pump 18, since the connection between the channels 44, 44' and 46, 46 'and thus between the inlets 24, 24' and the working channels 30, 30 'is interrupted by the second and fourth valve sealing surfaces 84, 84' bearing against the housing shoulders 89, 89 '.
  • valve sealing surface 87, 87 'becomes free which is due to this, for example takes place that the back pressure acts on the ring surfaces of the corresponding hollow shafts 67, 67 'projecting beyond the diameter of the respective pins 86, 86' and optionally on the transition points (valve sealing surface 84, 84 ') of the body and stem of the cone seat valves 80, 80'.
  • one of the working spaces 12 or 14 of the consumer 16 which is designed in the form of a cylinder which can be acted on from both sides, is now to be pressurized, one of the coils 62, 62 'of the pilot pressure generator 34, 34' is energized, causing the piston or the piston rod of the cylinder to move in or out is extended, whereas the coil of the other pilot pressure generator is not energized.
  • the coil 62 'of the pilot pressure generator 34' on the left valve half energized, then valve 58 'is moved to the left with reference to the drawing and releases pilot port 56'.
  • the pump chamber 68 ' is thereby acted upon by the pump pressure, since then a liquid connection from the inlet 24' via the channel 44 'connected to it, the cylinder chamber 38' in its part with the larger diameter, the pilot opening 56 ', the chamber 50 'and via the pilot channel 48' to the pilot room 68 '.
  • a pressure builds up in the left pilot space 68 ', which shifts the left valve part 64' to the right.
  • the left poppet valve 80 ' cannot follow this movement because the spring 92' is the fourth
  • Valve sealing surface 84 ' presses against the further housing shoulder 89' and thereby keeps the valve sealing surface closed.
  • the third valve sealing surface 87' opens, so that a fluid connection is created between the working space 12 and the collecting container 20, specifically via the working channel 30 ', the channel 46' connected to it Bore 40 ', the through hole 72', the annular space 42 'and the outlet 28.
  • the right valve part 64 is also shifted to the right via the then tensioned spring 74 and the right cone seat valve 80 counteracts the Effect of the right spring 92, since the hollow shaft 67 abuts the pin 86 of the right cone seat valve.
  • the coil 62 is excited to open the right pilot opening 56, after which the processes described above are reversed.
  • the consumer 16 can also be brought into a so-called floating position if both coils 62 and 62 'are excited at the same time. As a result, both pilot spaces 68 and 68 'are pressurized and both valve parts 64, 64' are moved to the center of valve 10. The valve sealing surfaces 87, 87 'become free, while the valve sealing surfaces 84, 84' remain closed. This creates a fluid connection between the two working spaces 12 and 14 to the outlet 28 and thus to the collecting container via the working channels 30, 30 ', the channels 46, 46', the bores 40, 40 'and the through bores 72, 72' in the valve parts 64, 64 'created. In this state, the piston in the consumer 16 can move freely.

Abstract

A four-function valve for operating a 2-way hydraulic cylinder has a pair of solenoid-operated pilots. The valve also includes a pair of valve members and a pair of poppet members, all slidable within bores in a pair of hollow sleeves. The solenoid-operated pilot valves control pilot pressure communication to the valve members to control movement of the valve and poppet members. Each poppet member has a pair of seats, one engageable with a shoulder on the sleeve to control fluid flow between a pump and the cylinder, the other engageable with an end of the corresponding valve member to control fluid flow between a sump and the cylinder.

Description

Die Erfindung bezieht sich auf ein Ventil zum Steuern der Flüssigkeitsverbindung zwischen einer Pumpe, einem Sammelbehälter und einem doppelseitig beaufschlagbaren Verbraucher.The invention relates to a valve for controlling the fluid connection between a pump, a collecting container and a consumer which can be acted upon from both sides.

Bei einem derartigen Ventil (US-A-3 587 630) sind in dem Gehäuse des Ventils eine Ventilbohrung, mindestens ein die Pumpe mit der Ventilbohrung verbindender Einlaß, ein die Ventilbohrung mit dem Sammelbehälter verbindender Auslaß, zwei die Ventilbohrung mit den Arbeitsräumen des Verbrauchers verbindende Arbeitskanäle und in der Ventilbohrung ein erster und ein zweiter druckabhängiger, verschiebbarer Ventilteil vorgesehen. Dabei wird der Bereich zwischen den beiden Ventilteilen von der Pumpe aus druckbeaufschlagt, wodurch linke und rechte federbelastete Kegelventil von ihren Sitzen abgehoben und eine Leitung mit der einen Seite des Verbrauchers und der Pumpe und eine weitere Leitung mit der anderen Seite des Verbrauchers und mit dem Sammelbehälter verbunden werden. Welche der beiden Leitungen mit der Pumpe und mit dem Sammelbehälter verbunden wird, hängt von der Stellung eines Steuerschiebers ab, der vier verschiedene Stellungen einnehmen kann, die dazu dienen, den Verbraucher in einer Schwimmstellung zu halten, in der beide Seiten des Verbrauchers mit dem Sammelbehälter verbunden sind und in der die Pumpe den Bereich zwischen den Ventilteilen druckbeaufschlagt, jeweils eine Seite des Verbrauchers mit der Pumpe und die andere Seite des Verbrauchers mit dem Sammelbehälter zu verbinden und dazu, beide Seiten des Verbrauchers und auch den Bereich zwischen den beiden Ventilteilen mit dem Sammelbehälter zu verbinden. In der letzten Stellung ist der Kolben des Verbrauchers blockiert. Mit dieser Kombination läßt sich zwar die angestrebte Funktion erreichen, es ist hierzu jedoch der Steuerschieber erforderlich, der ein zusätzliches Bauteil darstellt und durch mögliche Verunreinigungen in der Flüssigkeit störanfallig ist. Sein Verstellen in vier Verschiedene Positionen bedeutet einen zusätzlichen Aufwand.In such a valve (US-A-3 587 630) in the housing of the valve are a valve bore, at least one inlet connecting the pump to the valve bore, an outlet connecting the valve bore to the reservoir, two connecting the valve bore to the work spaces of the consumer Working channels and a first and a second pressure-dependent, displaceable valve part are provided in the valve bore. The area between the two valve parts is pressurized by the pump, causing the left and right spring-loaded cone valves to be lifted from their seats and a line with one side of the consumer and the pump and another line with the other side of the consumer and with the collecting container get connected. Which of the two lines is connected to the pump and to the collecting tank depends on the position of a control slide, which can take four different positions, which serve to keep the consumer in a floating position, in which both sides of the consumer with the collecting tank are connected and in which the pump pressurizes the area between the valve parts, in each case to connect one side of the consumer to the pump and the other side of the consumer to the collecting container and to do this, both sides of the consumer and also the area between the two valve parts to the Connect the collecting container. In the last position, the consumer piston is blocked. With this combination, the desired function can be achieved, but this requires the control slide, which is an additional component and is susceptible to failure due to possible contamination in the liquid. Adjusting it in four different positions means additional effort.

In der EP-A-0 103 250, die nur hinsichtlich der Neuheit zu berücksichtigen ist, wurde bereits ein Ventil offenbart, bei dem auf den Steuerschieber verzichtet wurde und bei dem zur Betätigung zwei Solenoidventile Verwendung finden. Dieses Ventil arbeitet ebenfalls mit zwei Ventilteilen, die auf Kegelventile im öffnenden Sinne wirken, um die nicht druckbeaufschlagte Seite des Verbrauchers mit dem Sammelbehälter zu verbinden. Dieses Ventil kann nicht so betätigt werden, daß der Kolben im Verbraucher in Schwimmstellung geht.EP-A-0 103 250, which is only to be taken into account with regard to the novelty, has already disclosed a valve in which the control slide has been dispensed with and in which two solenoid valves are used for actuation. This valve also works with two valve parts, which act on cone valves in the opening sense in order to connect the non-pressurized side of the consumer to the collection container. This valve cannot be operated so that the piston in the consumer goes into the floating position.

Bei einem anderen bekannten Ventil (DE A-1 751 902) zum Steuern der Flüssigkeitsverbindung zwischen einer Pumpe, einem Sammelbehälter und einem doppelseitig beaufschlagbaren Verbraucher ist eine Hand- und eine Fernbedienungssteuerung vorgesehen, über die je zwei Ventilkörper für die Beaufschlagung einer Seite des Verbrauchers aus einer Neutralstellung, in der der Zufluß zu und der Abfluß aus dem Verbraucher blockiert ist, in eine Richtung verschoben werden können, in der die eine Seite des Verbrauchers mit der Pumpe und die andere Seite des Verbrauchers mit dem Sammelbehälter verbunden ist. Bei Verschiebung der Ventilkörper aus der Neutralstellung in die entgegengesetzte Richtung wird die andere Seite des Verbrauchers mit der Pumpe und entsprechend die vorher druckbeaufschlagte Seite des Verbrauchers mit dem Sammelbehälter verbunden. Zum Beaufschlagen jeder Seite des Verbrauchers sind je ein zur Pumpe führender Einlaß, zwei zum Verbraucher führende Arbeitskanäle und zwei zu einem Sammelbehälter führende Auslässe vorgesehen, die in je eine Ventilbohrung münden. In jeder Ventilbohrung sind zwei Ventilkörper verschiebbar, die beide unter der Wirkung je einer Feder stehen, die den einen Ventilkörper in eine Endstellung verschieben will, in der der Zufluß von der Pumpe unterbrochen ist, während die andere Feder an dem zweiten Ventilkörper derart wirkt, daß er in seine den Arbeitszylinder mit dem Sammelbehälter verbindende Position verschoben werden soll. Damit muß dieser Ventilkörper entgegen der Wirkung seiner Feder über die Hand- oder Fernbedienungssteuerung in seiner Neutralstellung gehalten werden. Die Hand- oder Fernbedienungssteuering muß dabei so gestaltet sein, daß bei Verstellung in einer Richtung beide Ventilkörper positiv über die Steuerung verstellt werden können, während die Ventilkörper auf der anderen Seite unter Federwirkung ihre entsprechenden Stellungen einnehmen können. Die Ventilkörper selbst sind kompliziert aufgebaut, wobei je zwei im Bereich von in ihnen vorgesehenen Innenbohrungen noch Ventildichtflächen bilden. Im übrigen läßt sich mit diesem Ventil auch keine Schwimmstellung des Verbrauchers erreichen.In another known valve (DE A-1 751 902) for controlling the fluid connection between a pump, a collecting container and a consumer that can be acted on from both sides, a manual and a remote control are provided, via which two valve bodies each act on one side of the consumer a neutral position, in which the inflow to and the outflow from the consumer is blocked, can be shifted in a direction in which one side of the consumer is connected to the pump and the other side of the consumer is connected to the collecting container. When the valve body is shifted from the neutral position in the opposite direction, the other side of the consumer is connected to the pump and, accordingly, the previously pressurized side of the consumer is connected to the collection container. To act on each side of the consumer, an inlet leading to the pump, two working channels leading to the consumer and two outlets leading to a collecting container are provided, each of which opens into a valve bore. In each valve bore two valve bodies are displaceable, both of which are under the action of a spring which wants to move one valve body into an end position in which the inflow is interrupted by the pump, while the other spring acts on the second valve body in such a way that it is to be moved into its position connecting the working cylinder with the collecting container. So this valve body must be kept in the neutral position against the action of its spring via the manual or remote control. The manual or remote control must be designed so that when adjusting in one direction both valve bodies can be adjusted positively via the control, while the valve bodies on the other side can assume their corresponding positions under spring action. The valve bodies themselves are of complex construction, with two valve sealing surfaces each forming in the area of the inner bores provided in them. In addition, no floating position of the consumer can be achieved with this valve.

Die mit der Erfindung zu lösende Aufgabe wird darin gesehen, ein einfach zu steuerndes Ventil vorzusehen, das vier Funktionen erfüllen kann.The object to be achieved with the invention is seen in providing an easy-to-control valve that can perform four functions.

Diese Aufgabe wird nach der Erfindung mit einem Ventil zum Steuern der Flüssigkeitsverbindung zwischen einer Pumpe, einem Sammelbehälter und einem doppelseitig beaufschlagbaren Verbraucher gelöst, wobei in dem Gehäuse des Ventils eine Ventilbohrung, mindestens ein die Pumpe mit der Ventilbohrung verbindender Einlaß, ein die Ventilbohrung mit dem Sammelbehälter verbindender Auslaß, zwei die Ventilbohrung mit den Arbeitsräumen des Verbrauchers verbindende Arbeitskanäle und in der Ventilbohrung ein erster und ein zweiter druckabhängiger, verschiebbarer Ventilteil vorgesehen sind, in der Ventilbohrung ein erstes Kegelsitzventil, dessen federbelasteter Ventilkörper eine erste in der Neutralstellung gegen den ersten Ventilteil anliegende Ventildichtfläche zum Steuern der Flüssigkeitsverbinung zwischen dem Auslaß und dem ersten Arbeitskanal und eine zweite in der Neutralstellung gegen eine Gehäuseschulter der Ventilbohrung anliegende Ventildichtfläche zum Steuern der Flüssigkeitsverbindung zwischen dem Einlaß und dem ersten Arbeitskanal aufweist, und ein zweites Kegelsitzventil verschiebbar sind, dessen federbelasteter Ventilkörper eine dritte in der Neutralstellung gegen den zweiten Ventilteil anliegende Ventildichtfläche zum Steuern der Flüssigkeitsvebindung zwischen dem Auslaß und dem zweiten Arbeitskanal und eine vierte in der Neutralstellung gegen eine weitere Gehäuseschulter der Ventilbohrung anliegende Ventildichtfläche zum Steuern der Flüssigkeitsverbindung zwischen dem Einlaß und dem zweiten Arbeitskanal aufweist, erste und zweite Pilotdruckerzeuger vorgesehen sind, die einzeln derart betätigbar sind, daß an einem der Ventilteile ein Pilotdruck erzeugt werden kann, der die ersten und zweiten Ventilteile und einen der Ventilkörper der Kegelsitzventile verschiebt, wodurch ein Arbeitsraum des Verbrauchers mit der Pumpe und der andere Arbeitsraum mit dem Sammelbehälter verbunden werden, beide Pilotdruckerzeuger gemeinsam derart betätigbar sind, daß am ersten und zweiten Ventilteil ein Pilotdruck derart erzeugt werden kann, daß der erste und zweite Ventilteil verschoben werden, so daß beide Arbeitsräume des Verbrauchers mit dem Sammelbehälter verbunden sind, und wobei die Ventilteile durch den vom Systemdruck abgezweigten Pilotdruck gegen die Wirkung einer Anpresskraft von der ersten und/oder dritten Ventildichtfläche fort verschiebbar sind.This object is achieved according to the invention with a valve for controlling the fluid connection between a pump, a collecting container and a consumer which can be acted on from both sides, a valve bore, at least one inlet connecting the pump to the valve bore, and the valve bore to the valve housing in the valve housing Outlet connecting connecting container, two working channels connecting the valve bore with the work spaces of the consumer and in the valve bore a first and a second pressure-dependent, displaceable valve part are provided, in the valve bore a first cone seat valve, the spring-loaded valve body of which rests a first in the neutral position against the first valve part Valve sealing surface for controlling the fluid connection between the outlet and the first working channel and a second in the neutral position against a housing shoulder of the valve bore valve sealing surface for controlling the fluid connection between the inlet and the first working channel, and a second conical seat valve are displaceable, the spring-loaded valve body having a third valve sealing surface in the neutral position against the second valve part for controlling the fluid connection between the outlet and the second working channel and a fourth valve sealing surface in the neutral position against a further housing shoulder of the valve bore for controlling the fluid connection between the inlet and the second working channel, first and second pilot pressure generators are provided, which can be actuated individually in this way that a pilot pressure can be generated on one of the valve parts, which displaces the first and second valve parts and one of the valve bodies of the cone seat valves, whereby a working space of the Consumer connected to the pump and the other work space with the collecting container, both pilot pressure generators can be actuated together in such a way that a pilot pressure can be generated on the first and second valve parts in such a way that the first and second valve parts are moved so that both work spaces of the consumer are connected to the collecting container, and the valve parts can be displaced away from the first and / or third valve sealing surface against the effect of a contact pressure by the pilot pressure branched off from the system pressure.

Auf diese Weise kann auf einen zusätzlichen Steuerschieber verzichtet werden, da über die in das Ventil integrierten Pilotdruckerzeuger zunächst drei Funktionen erzielt werden können, und zwar ein Blockieren der Flüssigkeit in den Arbeitsräumen des Verbrauchers, wenn beide Pilotdruckerzeuger sich in Ruhestellung befinden, und eine zweite Funktion, wenn einer der beiden Pilotdruckerzeuger betätigt wird, wodurch ein Arbeitsraum des Verbrauchers mit der Pumpe und der andere Arbeitsraum mit dem Sammelbehälter verbunden wird. Die dritte Funktion, in der der andere Arbeitsraum mit der Pumpe und der erste Arbeitsraum mit dem Sammelbehälter verbunden ist, wird dann erreicht, wenn der andere Pilotdruckerzeuger betätigt wird und der zuvor betätigte wieder in seine Ruhe- oder Ausgangsstellung zurückgeführt ist. Eine vierte Funktion, in der der Kolben des Verbrauchers sich in einer Schwimmstellung befindet, ist in einfacher Weise dann gegeben, wenn beide Pilotdruckerzeuger gemeinsam betätigt werden.In this way, an additional control spool can be dispensed with, since the pilot pressure generator integrated in the valve can initially achieve three functions, namely blocking the liquid in the workrooms of the consumer when both pilot pressure generators are at rest, and a second function when one of the two pilot pressure generators is actuated, whereby one work space of the consumer is connected to the pump and the other work space is connected to the collecting container. The third function, in which the other working space is connected to the pump and the first working space is connected to the collecting container, is achieved when the other pilot pressure generator is actuated and the previously actuated one is returned to its rest or starting position. A fourth function, in which the piston of the consumer is in a floating position, is given in a simple manner when both pilot pressure generators are operated together.

Bei einem Ventil, bei dem jeder Ventilteil mit einer in seiner Längsachse verlaufenden Durchgangsbohrung versehen ist, wird nach der Erfindung vorgeschlagen, daß die Flüssigkeitsverbindung zwischen dem Auslaß und jedem Arbeitskanal bzw. beiden Arbeitskanälen durch die Durchgangsbohrungen erfolgt, sofern der oder die Ventilteile von der zugehörigen Ventildichtfläche des ersten oder zweiten Kegelsitzventils oder beiden frei ist. Damit kann der Rückfluß aus dem nicht druckbeaufschlagten Arbeitsraum des Verbrauchers in einfacher Weise zu dem einzigen zum Sammelbehälter führenden Auslaß geleitet werden.In a valve in which each valve part is provided with a through hole extending in its longitudinal axis, it is proposed according to the invention that the fluid connection between the outlet and each working channel or both working channels takes place through the through holes, if the valve part or parts of the associated Valve sealing surface of the first or second cone seat valve or both is free. This allows the backflow from the non-pressurized work space of the consumer to be directed in a simple manner to the only outlet leading to the collecting container.

Dadurch, daß erfindungsgemäß als Anpresskraft zwischen dem ersten und zweiten Ventilteil eine diese auseinanderdrückende Feder vorgesehen ist, wird erreicht, daß die Bewegung eines Ventilteils auf den anderen Ventilteil federnd übertragen wird und die Verbindung zu dem Auslaß immer erhalten bleibt. Hinzu kommt, daß die einzige Feder die Ventilteile bei nicht betätigten Pilotdruckerzeugern gegen die Kegelsitzventile drückt, so daß in der Ruhestellung die erste und dritte Ventildichtfläche geschlossen sind und ein Austreten der Flüssigkeit aus den Arbeitsräumen des Verbrauchers verhindert ist.Characterized in that according to the invention as a pressing force between the first and second valve part is a spring that pushes apart, it is achieved that the movement of one valve part is resiliently transmitted to the other valve part and the connection to the outlet is always maintained. In addition, the single spring presses the valve parts against the cone seat valves when the pilot pressure generators are not actuated, so that in the rest position the first and third valve sealing surfaces are closed and the liquid is prevented from escaping from the work spaces of the consumer.

Von Vorteil ist es nach der Erfindung außerdem, wenn jeweils eine Feder sich einenends am Gehäuse abstützt und anderenends gegen je ein Kegelsitzventil derart anliegt, daß die Kegelsitzventile aufeinander zu federbelastet sind. Hierdurch werden die zweiten und vierten Ventildichtflächen der Kegelsitzventile in Ruhestellung der Pilotdruckerzeuger, d. h. wenn diese nicht betätigt sind, immer geschlossen sein, so daß kein Arbeitsraum mit dem Pumpendruck beaufschlagbar ist.It is also advantageous according to the invention if in each case one spring is supported at one end on the housing and at the other end rests against a cone seat valve in such a way that the cone seat valves are spring-loaded towards one another. As a result, the second and fourth valve sealing surfaces of the cone seat valves are in the rest position of the pilot pressure generator, i. H. if these are not actuated, always be closed so that no working space can be acted upon by the pump pressure.

Bei einem Ventil, bei dem jeder Ventilteil mit einem hohlen Flansch und einem Hohlschaft und das Gehäuse im Bereich seiner Ventilbohrung mit einem Ringraum zur Aufnahme der Flansche und je einem Zylinderraum versehen sind, in die die Arbeitskanäle und der Einlaß münden und die über je eine Bohrung mit dem Ringraum verbunden sind, der mit dem Auslaß in Verbindung steht, kann der Auslaß in den mittigen Teil der Ringräume münden und können in den Zylinderräumen die Kegelsitzventile und die Hohlschäfte abdichtend in den Bohrungen verschiebbar sein, wobei jeder Flansch und jeder Hohlschaft mit dem Gehäuse zur Bildung eines Pilotraumes zusammenwirkt, die jeweils mit einem der Pilotdruckerzeuger verbunden sind.In the case of a valve in which each valve part is provided with a hollow flange and a hollow shaft and the housing in the region of its valve bore is provided with an annular space for receiving the flanges and a cylinder space into which the working channels and the inlet open and which each have a bore are connected to the annular space, which is in communication with the outlet, the outlet can open into the central part of the annular spaces and in the cylinder spaces the conical seat valves and the hollow shafts can be sealingly displaceable in the bores, each flange and each hollow shaft with the housing interacts to form a pilot room, each of which is connected to one of the pilot pressure generators.

Nach der Erfindung kann jeder Ventilteil mit einer Abflußblende versehen sein, die ihren Pilotraum mit dem Ringraum verbindet. Somit kann sich der Druck im Pilotraum einfach abbauen, was bei nicht betätigten Pilotdruckerzeugern ein Rückführen der Ventilteile in Ausgangsstellung und bei einem betätigten Pilotdruckerzeuger ein von der Blendenöffnung abhängiges feinfühliges öffnen der entsprechenden Ventildichtfläche bedeutet.According to the invention, each valve part can be provided with a drainage orifice which connects its pilot space to the annular space. Thus, the pressure in the pilot space can simply decrease, which means returning the valve parts to the starting position in the case of non-actuated pilot pressure generators and, in the case of an actuated pilot pressure generator, a sensitive opening of the corresponding valve sealing surface dependent on the orifice opening.

Zweckmäßig kann jeder Pilotdruckerzeuger einen mit dem jeweiligen Pilotraum verbundenen Pilotkanal und ein Solenoid gesteuertes Ventil aufweisen, über die der Zufluß in die Piloträume steuerbar ist.Each pilot pressure generator can expediently have a pilot channel connected to the respective pilot space and a solenoid-controlled valve, via which the inflow into the pilot spaces can be controlled.

Vorteilhaft sind die erste und dritte Ventildichtfläche der Kegelsitzventile jeweils gegen das Ende des zugehörigen Hohlschafts der Ventilteile zur Anlage bringbar.The first and third are advantageous Valve sealing surface of the poppet valves can be brought into contact with the end of the associated hollow shaft of the valve parts.

Im einzelnen sind nach der Erfindung jeder Einlaß und jeder Arbeitskanal über je einen Kanal mit dem zugehörigen Zylinderraum verbunden, wobei jeder Zylinderraum abgesetzt ausgebildet ist und in diesem Bereich die Gehäuseschulter bildet, ferner kann jedes Kegelsitzventil abgesetzt und derart ausgebildet sein, daß es eine Flüssigkeitsverbindung zwischen den Kanälen zuläßt, wenn die zweite bzw. vierte Ventildichtfläche von der Gehäuseschulter frei ist, wobei jeder Zylinderraum eine ständig mit dem oder den Einlässen verbundene Pilotöffnung aufweist, die über jeweils eines der Solenoid gesteuerten Ventile verschließbar ist.Specifically, according to the invention, each inlet and each working channel are connected to the associated cylinder space via a channel, each cylinder space being offset and forming the housing shoulder in this area, furthermore each cone seat valve can be offset and configured such that there is a fluid connection between allows the channels when the second or fourth valve sealing surface is free from the housing shoulder, each cylinder space having a pilot opening which is permanently connected to the inlet or inlets and which can be closed by means of one of the solenoid-controlled valves.

Auch sollte erfindungsgemäß zumindest die zweite und vierte Ventildichtfläche des Kegelsitzventils kegelig ausgebildet sein.According to the invention, at least the second and fourth valve sealing surfaces of the cone seat valve should also be conical.

Nach einem weiteren Vorschlag der Erfindung können bei einem vom Verbraucher kommenden Rückdruck Ventilteile und Kegelsitzventile relativ zueinander beweglich sein, so daß die erste bzw. dritte Ventildichtfläche frei wird. Damit entsteht dann eine Verbindung zum Sammelbehälter, so daß auf zusätzliche Überdruckventile verzichtet werden kann. Hierzu können die Enden der Hohlschäfte einen größeren Durchmesser aufweisen als die erste und dritte Ventildichtfläche aufweisende Zapfen der abgestuft ausgebildeten Kegelsitzventile.According to a further proposal of the invention, valve parts and cone seat valves can be movable relative to one another at a back pressure coming from the consumer, so that the first or third valve sealing surface is free. This creates a connection to the collection container, so that additional pressure relief valves can be dispensed with. For this purpose, the ends of the hollow shafts can have a larger diameter than the pins of the stepped conical seat valves, which have first and third valve sealing surfaces.

Zweckmäßig kann jeder Zylinderraum einen Teilabschnitt mit einem Durchmesser aufweisen, der dem der Bohrung entspricht und einen durch die Gehäuseschulter getrennten Teilabschnitt mit größerem Durchmesser.Each cylinder chamber can expediently have a section with a diameter that corresponds to that of the bore and a section with a larger diameter that is separated by the housing shoulder.

In der Zeichnung ist ein nachfolgend näher erläutertes Ausführungsbeispiel nach der Erfindung im Querschnitt dargestellt.In the drawing, an exemplary embodiment according to the invention, which is explained in more detail below, is shown in cross section.

Das erfindungsgemäße Ventil 10 kann elektrohydraulisch betätigt werden und steuert die Flüssigkeitsverbindung zwischen zwei Arbeitsräumen 12 und 14 eines Verbrauchers 16 in Form eines doppelseitig beaufschlagbaren Zylinders und einer Pumpe 18 und einem Sammelbehälter 20. Das Ventil 10 ist im wesentlichen aus zwei spiegelbildlichen Hälften gebildet, so daß nur eine Seite, und zwar die rechte, im Detail beschrieben zu werden braucht. Identische Teile auf der linken Seite sind in den Ansprüche mit denselben Bezugszeichen und Beistrich versehen und in der Zeichnung nur dann mit Bezugszeichen versehen, sofern dies zum besseren Verständnis erforderlich ist.The valve 10 according to the invention can be actuated electro-hydraulically and controls the fluid connection between two work spaces 12 and 14 of a consumer 16 in the form of a double-acting cylinder and a pump 18 and a collecting container 20. The valve 10 is essentially formed from two mirror-image halves, so that only one page, the right one, needs to be described in detail. Identical parts on the left-hand side are provided with the same reference symbols and comma in the claims and are only provided with reference symbols in the drawing if this is necessary for better understanding.

Das Ventil 10 weist ein Gehäuse 22 mit zwei Einlässen 24, 24' auf, die Flüssigkeit von der Pumpe 18 zu einer Ventilbohrung 26, die in dem Gehäuse 22 vorgesehen ist, leiten. Gleichfalls ist in dem Gehäuse 22 ein Auslaß 28 eingearbeitet, der den mittigen Teil der Ventilbohrung 26 mit dem Sammelbehälter 20 verbindet. Zwei Arbeitskanäle 30, 30' dienen der Verbindung zwischen der Ventilbohrung 26 und den Arbeitsräumen 12 und 14 des Verbrauchers 16.The valve 10 has a housing 22 with two inlets 24, 24 ′ which conduct liquid from the pump 18 to a valve bore 26 which is provided in the housing 22. Likewise, an outlet 28 is incorporated in the housing 22, which connects the central part of the valve bore 26 to the collecting container 20. Two working channels 30, 30 ′ serve to connect the valve bore 26 and the working spaces 12 and 14 of the consumer 16.

Die beiden Enden der Ventilbohrung 26 sind durch Pilotdruckerzeuger 34 verschlossen, die nachfolgend noch näher erläutert werden. Eine einfache Befestigung kann durch Verschrauben erfolgen und in der Ventilbohrung 26 sind Gehäusepatronen 36 eingesetzt, die mit Gehäuseteilen 37 der Pilotdruckerzeuger verschraubt sind. Jede Gehäusepatrone 36 ist abgestuft aufgebohrt, so daß im Zylinderraum 38 eine Bohrung 40 und ein Ringraum 42 entstehen.The two ends of the valve bore 26 are closed by pilot pressure generator 34, which will be explained in more detail below. A simple fastening can be done by screwing and in the valve bore 26 housing cartridges 36 are inserted, which are screwed to housing parts 37 of the pilot pressure generator. Each housing cartridge 36 is drilled out in stages so that a bore 40 and an annular space 42 are formed in the cylinder space 38.

Hierbei weist der Ringraum 42 den größten Durchmesser auf. An ihn schließt sich die Bohrung 40 mit relativ kleinem Durchmesser und der Zylinderraum 38 an, der anfangs einen der Bohrung 40 entsprechenden Durchmesser aufweist und dann in einen Teil größeren Durchmessers übergeht. Gleichfalls sind in jede Gehäusepatrone 36 Kanäle 44 und 46 und ein Pilotkanal 48 eingearbeitet. Dabei verbindet der Kanal 46 den Arbeitskanal 30 mit dem Zylinderraum 38 in dem Bereich, in dem er einen der Bohrung 40 entsprechenden Durchmesser aufweist, während der Kanal 44 den Einlaß 24 mit dem Zylinderraum 38 in seinem Bereich mit dem größeren Durchmesser verbindet. Der Pilotkanal 48 stellt eine Verbindung zwischen dem Ringraum 42 und einer Kammer 50 her, die von dem einen Ende der Gehäusepatrone 36 und dem gegenüberliegenden Teil des Gehäuseteils 37 des Pilotdruckerzeugers 34 gebildet ist.Here, the annular space 42 has the largest diameter. It is followed by the bore 40 with a relatively small diameter and the cylinder space 38, which initially has a diameter corresponding to the bore 40 and then merges into a part of a larger diameter. Likewise, 36 channels 44 and 46 and a pilot channel 48 are incorporated into each housing cartridge. The channel 46 connects the working channel 30 with the cylinder space 38 in the area in which it has a diameter corresponding to the bore 40, while the channel 44 connects the inlet 24 with the cylinder space 38 in its area with the larger diameter. The pilot channel 48 establishes a connection between the annular space 42 and a chamber 50, which is formed by one end of the housing cartridge 36 and the opposite part of the housing part 37 of the pilot pressure generator 34.

In die Kammer 50 ist ein Ventilstück 52 eingesetzt und an das eine Ende der Gehäusepatrone 36 über einen 0-Ring 54 dichtend angeschlossen. Das Ventilstück 52 verschließt den Zylinderraum 38 an seinem einen Ende und weist eine Pilotöffnung 56 auf, die von der Ventildichtfläche, eines Ventils 58 dichtend verschlossen werden kann. Das Ventil 58 ist Teil des Pilotdruckerzeugers 34 und mit einem Anker 60 fest verbunden, der über eine Spule 62 bewegt werden kann und unter der Wirkung einer Feder 63 steht, die das Ventil 58 in Richtung auf die Pilotöffnung 56 drückt. Die Spule 62 kann elektrisch erregt werden, wobei die Pilotöffnung 56 von dem Ventil 58 frei wird. Damit ist das Ventil 58 bzw. der Pilotdruckerzeuger 34 Solenoid gesteuertA valve piece 52 is inserted into the chamber 50 and is sealingly connected to one end of the housing cartridge 36 via an O-ring 54. The valve piece 52 closes the cylinder space 38 at one end and has a pilot opening 56 which can be sealed by the valve sealing surface of a valve 58. The valve 58 is part of the pilot pressure generator 34 and is permanently connected to an armature 60 which can be moved via a coil 62 and is under the action of a spring 63 which presses the valve 58 in the direction of the pilot opening 56. The coil 62 can be electrically excited, the pilot opening 56 being free of the valve 58. This controls the valve 58 or the pilot pressure generator 34 solenoid

In das andere Ende der Gehäusepatrone 36 ist ein hohl ausgebildeten Ventilteil 64 eingesetzt, das einen hohlen zylindrisch ausgebildeten Flansch 66 aufweist, der sich dichtend und verschiebbar in dem Ringraum 42 befindet und in einen sich axial erstreckenden Hohlschaft 67 übergeht, der wiederum von der Bohrung 40 dichtend und verschiebbar aufgenommen werden kann. Wie aus der Zeichnung hervorgeht, liegt der Ventilteil 64 in seiner Neutralstellung mit dem Boden seines Flansches 66 nicht gegen den Boden des Ringraumes 42 an, so daß ein Teil des Hohlschaftes 67 aus der Bohrung 40 übersteht und zwischen Ventilteil 64 und Gehäusepatrone ein Pilotraum 68 gebildet wird, der über den Pilotkanal 48 mit der Kammer 50 verbunden ist. In den Boden des Flansches 66 ist eine Abflußblende 70 mit kleinem DurchmesserIn the other end of the housing cartridge 36, a hollow valve part 64 is inserted, which has a hollow cylindrical flange 66, which is sealingly and displaceably in the annular space 42 and merges into an axially extending hollow shaft 67, which in turn extends from the bore 40 can be sealed and moved. As can be seen from the drawing, the valve part 64 is in its neutral position with the bottom of its flange 66 not against the bottom of the annular space 42, so that part of the hollow shaft 67 protrudes from the bore 40 and a pilot space 68 is formed between the valve part 64 and the housing cartridge is connected to the chamber 50 via the pilot channel 48. In the bottom of the flange 66 is a drainage aperture 70 with a small diameter

eingearbeitet, die eine Verbindung zwischen dem Pilotraum 68 und dem Auslaß 28 herstellt. Da der Hohlschaft 67 hohl ausgebildet ist, entsteht eine sich axial erstreckende Durchgangsbohrung 72, die ebenfalls zu dem Auslaß 28 hin offen ist. Die sich im Bereich des Auslasses 28 in der Neutralstellung mit ihren offenen Seiten mit Abstand gegenüberliegenden Ventilteile 64, 64' werden durch eine einzige zentrisch angeordnete Feder 74 auseinandergedrückt.incorporated, which creates a connection between the pilot room 68 and the outlet 28. Since the hollow shaft 67 is hollow, an axially extending through bore 72 is formed, which is also open to the outlet 28. The valve parts 64, 64 'located in the area of the outlet 28 in the neutral position with their open sides at a distance from one another are pressed apart by a single, centrally arranged spring 74.

Ein Kegesitzventil 80 ist ebenfalls verschiebbar in der Gehäusepatrone im Bereich des Zylinderraums 38 eingesetzt. Es besteht im einzelnen aus einem Ventilkörper 82 mit einer als Kegel ausgebildeten Ventildichtfläche, die für die rechte Ventilhälfte als zweite Ventildichtfläche 84 und für die linke Ventilhälfte als vierte Ventildichtfläche 84' bezeichnet ist. Die Ventildichtfläche geht in einen Zapfen 86 über, der endseitig ebenfalls eine kegelige Ventildichtfläche aufweist, die für die rechte Ventilhälfte als erste Ventildichtfläche 87 und für die linke Ventilhälfte als dritte Ventildichtfläche 87' bezeichnet werden kann. Die Ventildichtfläche 87 und 87' können sich dichtend gegen die Enden der Hohlschäfte 67 anlegen, wohingegen die Ventildichtsfläche 84, 84', dichtend gegen jeweils eine Gehäuseschulter anlegen können, die in dem Teil des Zylinderraums 38 gebildet ist, in dem der dem Durchmesser der Bohrung 40 entsprechende Teil in den Teil mit dem größeren Durchmesser übergeht. Für die rechte Ventilhälfte ist die Gehäuseschulter mit 89 und für die linke Ventilhälfte mit 89' bezeichnet. Ventilkörper 82 und Zapfen 86 weisen einen kleineren Durchmesser als die sie aufnehmenden Teile des Zylinderraums 38 auf, so daß der Zapfen 86 einen kleineren Durchmesser als die Bohrung 40 bzw. als der Außendurchmesser des Hohlschafts 67 aufweist, wodurch am Hohlschaft eine Ringfläche verbleibt, die einem Rückdruck von dem Verbraucher 16 ausgesetzt werden kann. Selbstverständlich können die Zapfen 86 und Ventilkörper 82 auch anders ausgebildet werden. Es muß aber sichergestellt sein, daß bei freien Ventildichtflächen 84, 84' eine Flüssigkeitsverbindung vom Kanal 44 zum Kanal 46 möglich ist und daß die Flüssigkeit aus dem Kanal, zu der Pilotöffnung 56 gelangen kann. Ein mit dem Kegelsitzventil 80 verbundener Ringflansch 90 ist in dem Teil des Zylinderraums 38 mit dem größeren Durchmesser an das Kegelsitzventil anschließend verschiebbar angeordnet und steht unter der Wirkung einer Feder. Hierbei ist die rechte Feder mit 92 und die Feder an der linken Ventilhälfte mit 92' bezeichnet. Beide Federn 92 und 92' wirken so, daß die Ventildichtflächen 84, 87 und 84' und 87' in Richtung auf die Enden der Hohlschäfte 67 und die Gehäuseschultern 89 und 89' gedrückt werden. Auch der Ringflansch 90 ist so auszubilden, daß eine Verbindung vom Kanal 40 zu der Pilotöffnung 56 immer möglich ist, was beispielsweise durch eingefräste Längsnuten, die in der Zeichnung nicht dargestellt sind, erfolgen kann.A Kegesitzventil 80 is also slidably inserted in the housing cartridge in the region of the cylinder space 38. Specifically, it consists of a valve body 82 with a valve sealing surface designed as a cone, which is referred to as a second valve sealing surface 84 for the right valve half and as a fourth valve sealing surface 84 'for the left valve half. The valve sealing surface merges into a pin 86, which also has a conical valve sealing surface at the end, which can be referred to as the first valve sealing surface 87 for the right valve half and as the third valve sealing surface 87 'for the left valve half. The valve sealing surface 87 and 87 'can bear sealingly against the ends of the hollow shafts 67, whereas the valve sealing surface 84, 84' can sealingly bear against a respective housing shoulder which is formed in the part of the cylinder space 38 in which the diameter of the bore 40 corresponding part merges into the part with the larger diameter. The housing shoulder is designated 89 'for the right valve half and 89' for the left valve half. Valve body 82 and pin 86 have a smaller diameter than the parts of the cylinder space 38 which receive them, so that the pin 86 has a smaller diameter than the bore 40 or the outer diameter of the hollow shaft 67, as a result of which an annular surface remains on the hollow shaft Back pressure from the consumer 16 can be exposed. Of course, the pins 86 and valve body 82 can also be designed differently. However, it must be ensured that a liquid connection from the channel 44 to the channel 46 is possible with free valve sealing surfaces 84, 84 'and that the liquid can reach the pilot opening 56 from the channel. An annular flange 90 connected to the cone seat valve 80 is arranged to be displaceable in the part of the cylinder space 38 with the larger diameter next to the cone seat valve and is under the action of a spring. The right spring is designated 92 and the spring on the left valve half is designated 92 '. Both springs 92 and 92 'act such that the valve sealing surfaces 84, 87 and 84' and 87 'are pressed in the direction of the ends of the hollow shafts 67 and the housing shoulders 89 and 89'. The ring flange 90 is also to be designed such that a connection from the channel 40 to the pilot opening 56 is always possible, which can be done, for example, by milled longitudinal grooves, which are not shown in the drawing.

Im nachfolgenden wird auf die Wirkungsweise eingegangen. Wenn die Solenoide bzw. Spulen 62 der beiden Pilotdruckerzeuger 34 und 34' nicht erregt sind, dann sind auch die Pilotöffnungen 56, 56' durch die Ventile 58, 58' geschlossen, so daß die Piloträume 68, 68' nicht mit dem Pumpendruck beaufschlagt werden können. Flüssigkeit kann durch die Abflußblenden 70, 70' aus den Piloträumen 68, 68' zum Sammelbehälter 20 gelangen und die Federn 74 und 92, 92' können die Ventilteile 64, 64' und Kegelsitzventile 80, 80' in der in der Zeichnung dargestellten Position halten oder in diese zurückführen. In dieser Stellung bzw. bei diesem Zustand sind die Ventildichtflächer 84' und 87, 87' geschlossen, so daß von der Pumpe 18 keine Flüssigkeit zu den Arbeitskanälen 30, 30' gefördert werden kann, da die Verbindung zwischen den Kanälen 44,44' und 46, 46' und somit zwischen den Einlässen 24, 24' und den Arbeitskanälen 30, 30' durch die gegen die Gehäuseschultern 89, 89' anliegenden zweiten und vierten Ventildichtflächen 84, 84' unterbrochen ist. Gleichzeitig kann im Normalfall keine Flüssigkeit aus den Arbeitsräumen 12 und 14 des Verbrauchers 16 in den Sammelbehälter 20 gelangen, da die ersten und dritten Ventildichtfläche 87, 87' gegen die entsprechenden Enden der Hohlschäfte 67, 67' anliegen und damit eine Verbindung der Arbeitskanäle 30, 30' bzw. der Kanäle 46, 46' mit dem einzigen Auslaß 28 unterbrechen. Sollte aber in diesem Zustand ein zu hoher Rückdruck auftreten, beispielsweise dann, wenn auf eine Seite des Verbrauchers eine unvorhergesehene äußere Kraft einwirkt, so wird sich diese Rückdruck so auswirken, daß die erste oder dritte Ventildichtfläche 87, 87' frei wird, was beispielsweise dadurch erfolgt, daß der Rückdruck auf die über den Durchmesser der jeweiligen Zapfen 86, 86' überstehenden Ringflächen der entsprechenden Hohlschäfte 67, 67' und gegebenenfalls auf die Übergangsstellen (Ventildichtfläche 84, 84') von Körper und Schaft der Kegelsitzventile 80, 80' wirkt. Bei dem Abheben eine der ersten oder dritten Ventildichtfläche 87, 87' entsteht eine Flüssigkeitsverbindung der jeweiligen Arbeitsräume 12 und 14 mit dem Sammelbehälter 20 über die Arbeitskanäle 30, 30', den mit diesen in Verbindung stehenden Kanälen 46, 46', den Durchgangsbohrungen 72, 72' und dem Auslaß 28.The mode of operation is discussed below. If the solenoids or coils 62 of the two pilot pressure generators 34 and 34 'are not excited, then the pilot openings 56, 56' are also closed by the valves 58, 58 ', so that the pilot spaces 68, 68' are not acted upon by the pump pressure can. Liquid can pass through the orifices 70, 70 'from the pilot spaces 68, 68' to the reservoir 20 and the springs 74 and 92, 92 'can hold the valve members 64, 64' and poppet valves 80, 80 'in the position shown in the drawing or return to it. In this position or in this state, the valve sealing surfaces 84 'and 87, 87' are closed, so that no liquid can be conveyed to the working channels 30, 30 'by the pump 18, since the connection between the channels 44, 44' and 46, 46 'and thus between the inlets 24, 24' and the working channels 30, 30 'is interrupted by the second and fourth valve sealing surfaces 84, 84' bearing against the housing shoulders 89, 89 '. At the same time, normally no liquid can get from the working spaces 12 and 14 of the consumer 16 into the collecting container 20, since the first and third valve sealing surfaces 87, 87 'bear against the corresponding ends of the hollow shafts 67, 67' and thus a connection of the working channels 30, 30 'or the channels 46, 46' with the single outlet 28 interrupt. If, however, an excessively high back pressure occurs in this state, for example when an unforeseen external force acts on one side of the consumer, this back pressure will have an effect such that the first or third valve sealing surface 87, 87 'becomes free, which is due to this, for example takes place that the back pressure acts on the ring surfaces of the corresponding hollow shafts 67, 67 'projecting beyond the diameter of the respective pins 86, 86' and optionally on the transition points (valve sealing surface 84, 84 ') of the body and stem of the cone seat valves 80, 80'. When one of the first or third valve sealing surfaces 87, 87 'is lifted, there is a fluid connection between the respective working spaces 12 and 14 with the collecting container 20 via the working channels 30, 30', the channels 46, 46 'connected to them, the through bores 72, 72 'and the outlet 28.

Soll nun einer der Arbeitsräume 12 oder 14 des in Form eines doppelseitig beaufschlagbaren Zylinders ausgebildeten Verbrauchers 16 druckbeaufschlagt werden, so wird eine der Spulen 62, 62' der Pilotdruckerzeuger 34, 34' erregt, wodurch der Kolben bzw. die Kolbenstange des Zylinders ein- oder ausgefahren wird, wohingegen die Spule des anderen Pilotdruckerzeugers nicht erregt wird. Wird zum Beispiel die Spule 62' des Pilotdruckerzeugers 34' an der linken Ventilhälfte erregt, dann wird das Ventil 58' mit Bezug auf die Zeichnung nach links bewegt und gibt die Pilotöffnung 56' frei. Dadurch wird der Pilotraum 68' mit dem Pumpendruck beaufschlagt, da dann eine Flüssigkeitsverbindung von dem Einlaß 24' über den mit diesem in Verbindung stehenden Kanal 44', den Zylinderraum 38' in seinem Teil mit dem größeren Durchmesser, die Pilotöffnung 56', die Kammer 50' und über den Pilotkanal 48' zu dem Pilotraum 68' besteht. Hierdurch baut sich in dem linken Pilotraum 68' ein Druck auf, der den linken Ventilteil 64' nach rechts verschiebt. Das linke Kegelsitzventil 80' kann dieser Bewegung nicht folgen, da die Feder 92' die vierteIf one of the working spaces 12 or 14 of the consumer 16, which is designed in the form of a cylinder which can be acted on from both sides, is now to be pressurized, one of the coils 62, 62 'of the pilot pressure generator 34, 34' is energized, causing the piston or the piston rod of the cylinder to move in or out is extended, whereas the coil of the other pilot pressure generator is not energized. For example, the coil 62 'of the pilot pressure generator 34' on the left valve half energized, then valve 58 'is moved to the left with reference to the drawing and releases pilot port 56'. The pump chamber 68 'is thereby acted upon by the pump pressure, since then a liquid connection from the inlet 24' via the channel 44 'connected to it, the cylinder chamber 38' in its part with the larger diameter, the pilot opening 56 ', the chamber 50 'and via the pilot channel 48' to the pilot room 68 '. As a result, a pressure builds up in the left pilot space 68 ', which shifts the left valve part 64' to the right. The left poppet valve 80 'cannot follow this movement because the spring 92' is the fourth

Ventildichtfläche 84' gegen die weitere Gehäuseschulter 89' drückt und dadurch die Ventildichtfläche geschlossen hält. Beim Verschieben des Ventilteils 64' nach rechts öffnet sich aber die dritte Ventildichtfläche 87', so daß eine Flüssigkeitsverbindung zwischen dem Arbeitsraum 12 und dem Sammelbehälter 20 entsteht, und zwar über den Arbeitskanal 30', dem mit diesem in Verbindung stehenden Kanal 46', der Bohrung 40', der Durchgangsbohrung 72', dem Ringraum 42' und dem Auslaß 28. Gleichzeitig wird bei dem Verschieben des Ventilteils 64' nach rechts der rechte Ventilteil 64 ebenfalls nach rechts über die dann gespannte Feder 74 verschoben sowie das rechte Kegelsitzventil 80 entgegen der Wirkung der rechten Feder 92, da der Hohlschaft 67 an dem Zapfen 86 des rechten Kegelsitzventils anliegt. Bei der Verschiebung des rechten Kegelsitzventils 80 nach rechts wird die zweite Ventildichtfläche 84 freigegeben, während durch das Anliegen des Hohlschaftes 67 an dem Zapfen 86 die erste Ventildichtfläche 87 geschlossen bleibt. Sobald die zweite Ventildichtfläche 84 nach ihrem Abheben von der ortsfesten Gehäuseschulter 89 öffnet, entsteht eine Flüssigkeitsverbindung zwischen der Pumpe 18 und dem Arbeitsraum 14 über den Einlaß 24, den mit diesem verbundenen Kanal 44, den Zylinderraum 38, dem mit diesem verbundenen Kanal 46 und dem Arbeitskanal 30. Bei diesem Vorgang wird die Kolbenstange des Verbrauchers 16 eingefahren und die rechte Pilotöffnung 56 bleibt verschlossen und sich noch im rechten Pilotraum 68 befindliche Flüssigkeit kann durch die Abflußblende 70 austreten. Je nachdem wie der Querschnitt der Abflußblende 70 gewählt ist, kann ein feinfühliges Ansprechen des Verbrauchers 16 erreicht werden. Selbstverständlich sind die einzelnen Verschiebewege so bemessen, daß die Mündungen der Kanäle 46, 46' in die Zylinderräume 38, 38' nicht durch die Hohlschäfte 67, 67' verschlossen werden können. Gleiches gilt für den Auslaß 28.Valve sealing surface 84 'presses against the further housing shoulder 89' and thereby keeps the valve sealing surface closed. When the valve part 64 'is shifted to the right, however, the third valve sealing surface 87' opens, so that a fluid connection is created between the working space 12 and the collecting container 20, specifically via the working channel 30 ', the channel 46' connected to it Bore 40 ', the through hole 72', the annular space 42 'and the outlet 28. At the same time, when the valve part 64' is shifted to the right, the right valve part 64 is also shifted to the right via the then tensioned spring 74 and the right cone seat valve 80 counteracts the Effect of the right spring 92, since the hollow shaft 67 abuts the pin 86 of the right cone seat valve. When the right cone seat valve 80 is shifted to the right, the second valve sealing surface 84 is released, while the first valve sealing surface 87 remains closed due to the hollow shaft 67 resting on the pin 86. As soon as the second valve sealing surface 84 opens after it has been lifted off the stationary housing shoulder 89, there is a fluid connection between the pump 18 and the working chamber 14 via the inlet 24, the channel 44 connected to it, the cylinder chamber 38, the channel 46 connected to it Working channel 30. In this process, the piston rod of the consumer 16 is retracted and the right pilot opening 56 remains closed and liquid still in the right pilot chamber 68 can escape through the drainage orifice 70. Depending on how the cross section of the drainage aperture 70 is selected, a sensitive response of the consumer 16 can be achieved. Of course, the individual displacement paths are dimensioned such that the openings of the channels 46, 46 'into the cylinder spaces 38, 38' cannot be closed by the hollow shafts 67, 67 '. The same applies to outlet 28.

Soll die Kolbenstange des Verbrauchers 16 ausgefahren werden, so wird die Spule 62 zum öffnen der rechten Pilotöffnung 56 erregt, wonach die vorstehend beschriebenen Vorgänge seitenvertauscht ablaufen.If the piston rod of the consumer 16 is to be extended, the coil 62 is excited to open the right pilot opening 56, after which the processes described above are reversed.

Der Verbraucher 16 kann auch in eine sogenannte Schwimmstellung verbracht werden, wenn beide Spulen 62 und 62' gleichzeitig erregt werden. Dadurch werden beide Piloträume 68 und 68' druckbeaufschlagt und beide Ventilteile 64, 64' zur Mitte de Ventils 10 verschoben. Dabei werden die Ventildichtflächen 87, 87' frei, während die Ventildichtflächen 84, 84' geschlossen bleiben. Dadurch wird eine Flüssigkeitsverbindung beider Arbeitsräume 12 und 14 zu dem Auslaß 28 und damit zum Sammelbehälter über die Arbeitskanäle 30, 30', die Kanäle 46,46', die Bohrungen 40, 40' und die Durchgangsbohrungen 72, 72' in den Ventilteilen 64, 64' geschaffen. In diesem Zustand kann sich der Kolben in dem Verbraucher 16 frei bewegen.The consumer 16 can also be brought into a so-called floating position if both coils 62 and 62 'are excited at the same time. As a result, both pilot spaces 68 and 68 'are pressurized and both valve parts 64, 64' are moved to the center of valve 10. The valve sealing surfaces 87, 87 'become free, while the valve sealing surfaces 84, 84' remain closed. This creates a fluid connection between the two working spaces 12 and 14 to the outlet 28 and thus to the collecting container via the working channels 30, 30 ', the channels 46, 46', the bores 40, 40 'and the through bores 72, 72' in the valve parts 64, 64 'created. In this state, the piston in the consumer 16 can move freely.

Claims (14)

1. Valve (10) for controlling the fluid communication between a pump (18), a reservoir (20) and a double-acting fluid motor (16), in which
- in the housing (22) of the valve (10) a valve bore (26), at least one inlet port (24) connecting the pump (18) with the valve bore (26), an outlet port (28) connecting the valve bore (26) with the reservoir (20), two load ports (30, 30') connecting the valve bore (26) with the work chambers (12, 14) of the fluid motor (16) and in the valve bore (26) a first and a second pressure-responsive, movable valve members (64, 64') are provided,
- in the valve bore (26) a first conically seated valve (80), whose spring loaded valve body (82) has a first valve sealing surface (87), bearing against the first valve member (64) in the neutral position for controlling the fluid communication between the outlet port (28) and the first load port (30), and a second valve sealing surface (84), bearing against a housing shoulder (89) of the valve bore (26) in the neutral position for controlling the fluid communication between the inlet port (24) and the first load port (30), and a second conically seated valve (80') are movable, the latter's spring loaded valve body (82') has a third valve sealing surface (87'), bearing against the second valve member (64') in the neutral position for controlling the fluid communication between the outlet port (28) and the second load port (30'), and a fourth valve sealing surface (84'), bearing against a further housing shoulder (89') of the valve bore (26) in the neutral position for controlling the fluid communication between the inlet port (24) and the second load port (30'),
- first and second pilot pressure generators (34, 34') are provided, which can be actuated individually in such a way that on one of the valve members (64, 64') a pilot pressure can be generated which moves the first and second valve members (64,64') and one of the valve bodies (82, 82') of the conically seated valves (80, 80'), as a result of which one work chamber (12 or 14) of the fluid motor (16) is connected with the pump (18) and the other work chamber (14 or 12) with the reservoir (20),
- both pilot pressure generators (34, 34') can be actuated jointly in such a way that on the first and second valve members (64, 64') a pilot pressure can be generated in such a way that the first and second valve members (64, 64') are moved, so that both work chambers (12,14) of the fluid motor (16) are connected with the reservoir (20), and in which
- the valve members (64,64') can be moved away by the pilot pressure branching from the system pressure against the action of a bearing pressure (spring 74) from the first (87) and/or third valve sealing surface (87').
2. Valve as per claim 1, characterised by the fact that each valve member (64, 64') is provided with a through bore (72, 72') running along its longitudinal axis and the fluid communication between the outlet port (28) and each load port (30, 30') or both load ports is effected by means of the through bores (72, 72') in so far as the valve member or members (64, 64') are free from the relevant valve sealing surface (87 or 87') of the first or second conically seated valve (80 or 80') or both.
3. Valve as per claim 1, characterised by the fact that as bearing pressure between the first and second valve members (64, 64') a spring (74) pressing these apart is provided.
4. Valve as per one or more of the previous claims, characterised by the fact that each one of the springs (92, 92') is supported at one end on the housing (22) and at the other end against a conically seated valve (80, 80') in such a way that the conically seated valves (80, 80') are spring loaded in relation to each other.
5. Valve as per one or more of the previous claims, characterised by the fact that each valve member (64, 64') is provided with a hollow flange (66,66') and a hollow shaft (67, 67') and the housing (22) is provided with an annular space (42, 42') in the region of its valve bore (26) for receiving the flanges (66, 66') and with each cylindrical space (38, 38') and the load ports (30, 30') and the inlet port (24, 24') open into these and they are connected via a bore (40, 40') with the annular space (42, 42'), which is connected with the outlet port (28), with the outlet port (28) opening into the middle section of the annular space (42, 42') and in the cylindrical spaces (38, 38') the conically seated valves (80, 80') and the hollow shafts (67, 67') are sealingly movable in the bores (40,40'), and with each flange (66, 66') and each hollow shaft (67, 67') working in conjunction with the housing (22) for the formation of a pilot chamber (68, 68'), which in each case is connected with one of the pilot pressure generators (34, 34').
6. Valve as per claim 5, characterised by the fact that each valve member (64, 64') is provided with a discharge shutter (70, 70') which connects its pilot chamber (68, 68') with the annular space (42, 42').
7. Valve as per claim 5, characterised by the fact that each pilot pressure generator (34, 34') has a pilot pipe (48,48') connected with the relevant pilot chamber (68, 68') and a solenoid controlled valve (58, 58'), by means of which the delivery into the pilot chambers can be controlled.
8. Valve as per one or more of the previous claims, characterised by the fact that the first and third valve sealing surfaces (87 and 87') of the conically seated valves (80, 80') can be brought to bear against the end of the respective hollow shaft (67, 67') of the valve members (64, 64').
9. Valve as per one or more of the previous claims, characterised by the fact that each inlet port (24, 24') and each load port (30, 30') are connected via a pipe each (44, 46, 44', 46') with the respective cylindrical space (38, 38'), with each cylindrical space (38, 38') formed with a step and forming the housing shoulder (89, 89'), further that each conically seated valve (80, 80') is formed with a step and in such a way that it permits a fluid communication between the pipes (44, 46 or 44', 46') when the second or fourth valve sealing surface (84, 84') is free of the housing shoulder (89 or 89').
10. Valve as per one or more of the previous claims, characterised by the fact that each cylindrical space (38, 38') has a pilot opening (56, 56') permanently connected with the inlet port or ports (24, 24'), which is closable in each case by one of the solenoid controlled valves (58, 58').
11. Valve as per one or more of the previous claims, characterised by the fact that at least the second and fourth valve sealing surfaces (84, 84') of the conically seated valve (80, 80') are conically shaped.
12. Valve as per one or more of the previous claims, characterised by the fact that with a backpressure coming from the fluid motor (16) valve members (64, 64') and conically seated valves (80, 80') are movable in relation to each other, so that the first or third valve sealing surface (87, 87') becomes free.
13. Valve as per claim 12, characterised by the fact that the ends of the hollow shafts (67, 67') have a greater diameter than the pins (86, 86') of the step-formed conically seated valves (80, 80') exhibiting first and third valve sealing surfaces (87, 87').
14. Valve as per claim 9, characterised by the fact that each cylindrical space (38, 38') has a part section with a diameter which corresponds to that of the bore (40,40') and a part section with greater diameter separated by the housing shoulder (89, 89').
EP84111742A 1983-10-07 1984-10-02 Valve for the command of fluid flow between a pump, a fluid reservoir and a double acting hydraulic device Expired EP0139259B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111742T ATE33877T1 (en) 1983-10-07 1984-10-02 VALVE FOR CONTROLLING THE FLUID COMMUNICATION BETWEEN A PUMP, A RECEIVER AND A DOUBLE-ACTING CONSUMER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/539,785 US4506700A (en) 1983-10-07 1983-10-07 Poppet valve with float function
US539785 1983-10-07

Publications (2)

Publication Number Publication Date
EP0139259A1 EP0139259A1 (en) 1985-05-02
EP0139259B1 true EP0139259B1 (en) 1988-04-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111742A Expired EP0139259B1 (en) 1983-10-07 1984-10-02 Valve for the command of fluid flow between a pump, a fluid reservoir and a double acting hydraulic device

Country Status (10)

Country Link
US (1) US4506700A (en)
EP (1) EP0139259B1 (en)
JP (1) JPS6098272A (en)
AT (1) ATE33877T1 (en)
AU (1) AU560646B2 (en)
BR (1) BR8405019A (en)
DE (1) DE3470778D1 (en)
DK (1) DK479084A (en)
ES (1) ES8601438A1 (en)
ZA (1) ZA847798B (en)

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EP0686775A1 (en) 1994-05-07 1995-12-13 Robert Bosch Gmbh Electropneumatic valve assembly

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EP0580877B1 (en) * 1991-07-09 1995-08-30 Honeywell Lucifer Sa Pressure regulator device
GB2310030A (en) * 1996-02-07 1997-08-13 Lucas Ind Plc Fluid pressure operated valve arrangement
US6805328B2 (en) * 2002-06-04 2004-10-19 Maxon Corporation Shut-off valve apparatus
US6789563B2 (en) * 2002-06-04 2004-09-14 Maxon Corporation Pneumatic exhaust controller
KR100849500B1 (en) 2006-11-29 2008-07-31 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 double check valve with floating function
KR100915206B1 (en) * 2007-09-20 2009-09-02 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 double check valve with floating function
US8444400B2 (en) * 2009-02-13 2013-05-21 Caterpillar Inc. Hydraulic cylinder having piston-mounted bypass valve
WO2011145759A1 (en) * 2010-05-18 2011-11-24 볼보 컨스트럭션 이큅먼트 에이비 Double check valve for construction equipment
US8590571B2 (en) 2010-07-22 2013-11-26 Bendix Commercial Vehicle Systems Llc Latching valve
US8474487B2 (en) 2010-07-22 2013-07-02 Bendix Commercial Vehicle System Llc Latching valve

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EP0686775A1 (en) 1994-05-07 1995-12-13 Robert Bosch Gmbh Electropneumatic valve assembly

Also Published As

Publication number Publication date
DK479084A (en) 1985-04-08
DK479084D0 (en) 1984-10-05
JPS6098272A (en) 1985-06-01
ATE33877T1 (en) 1988-05-15
BR8405019A (en) 1985-08-20
ZA847798B (en) 1986-05-28
ES536557A0 (en) 1985-10-16
AU3260284A (en) 1985-04-18
EP0139259A1 (en) 1985-05-02
ES8601438A1 (en) 1985-10-16
US4506700A (en) 1985-03-26
AU560646B2 (en) 1987-04-09
DE3470778D1 (en) 1988-06-01

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