EP0003196B1 - Modular element for hydraulic flow distributor - Google Patents

Modular element for hydraulic flow distributor Download PDF

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Publication number
EP0003196B1
EP0003196B1 EP79400013A EP79400013A EP0003196B1 EP 0003196 B1 EP0003196 B1 EP 0003196B1 EP 79400013 A EP79400013 A EP 79400013A EP 79400013 A EP79400013 A EP 79400013A EP 0003196 B1 EP0003196 B1 EP 0003196B1
Authority
EP
European Patent Office
Prior art keywords
modular element
opening
bore
output opening
flow
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
EP79400013A
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German (de)
French (fr)
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EP0003196A1 (en
Inventor
Jean-François Louviot
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.)
Regie Nationale des Usines Renault
Original Assignee
Regie Nationale des Usines Renault
Priority date (The priority date 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 date listed.)
Filing date
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Application filed by Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
Publication of EP0003196A1 publication Critical patent/EP0003196A1/en
Application granted granted Critical
Publication of EP0003196B1 publication Critical patent/EP0003196B1/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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
    • F15B2211/40538—Flow control characterised by the type of flow control means or valve with flow dividers using volumetric pumps or motors
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2514—Self-proportioning flow systems
    • Y10T137/2521—Flow comparison or differential response
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7784—Responsive to change in rate of fluid flow
    • Y10T137/7787—Expansible chamber subject to differential pressures
    • Y10T137/7788—Pressures across fixed choke
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7793—With opening bias [e.g., pressure regulator]
    • Y10T137/7801—Balanced valve
    • 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
    • Y10T137/877—With flow control means for branched passages
    • Y10T137/87885—Sectional block structure

Definitions

  • each piston where the spring is placed such as 14, 114, 214 is at the pressure of the channel 12, 112, 212 where the pressure prevails average downstream of the pistons at 6, 16, 26.
  • the orifices of the removable nozzles 4, 104, 204 are all identical, the flow rates having been chosen equal in the example described.

Description

La présente invention se rapporte au domaine des circuits hydrauliques haute pression et, en particulier, à la commande de vérins ou moteurs hydrauliques à partir d'une ligne de conduite d'alimentation commune dont les débits doivent alors être divisés en fonction de chaque appareil desservi, assurant pour ceux-ci un débit constant quelles que soient leurs variations de charge.The present invention relates to the field of high pressure hydraulic circuits and, in particular, to the control of hydraulic cylinders or motors from a common supply line whose flow rates must then be divided according to each device served. , ensuring for them a constant flow whatever their load variations.

On connaît par la demande de brevet DE-AS-1 262883 un inverseur de débit qui possède un piston différentiel creux, monté à déplacement axial dans un alésage qui débouche sur une face d'assemblage du corps de l'inverseur avec la face correspondante d'un couvercle de fermeture de l'alésage qui débouche sur une face d'assemblage du corps de l'inverseur avec la face correspondante d'un couvercle de fermeture de l'alésage et qui contient un ressort de rappel. Un étranglement d'entrée commande l'ouverture d'un clapet de surpression intégré au piston pour réaliser le signal de pression de commande d'une modification de la position du piston.DE-AS-1 262883 discloses a flow reverser which has a hollow differential piston, mounted for axial displacement in a bore which opens onto an assembly face of the body of the reverser with the corresponding face d a cover for closing the bore which opens onto an assembly face of the reverser body with the corresponding face of a cover for closing the bore and which contains a return spring. An inlet throttle controls the opening of a pressure relief valve built into the piston to carry out the control pressure signal for a change in the position of the piston.

On connaît par la demande de brevet DE-A-2 356 414 un diviseur de débit constitué par un piston monté mobile dans un alésage, dont une face reçoit la poussée d'un ressort et dont l'autre face reçoit la pression de ligne, tandis qu'un perçage axial dans le piston assure la mise en pression des différentes chambres délimitées par le corps du piston et l'alésage.DE-A-2 356 414 discloses a flow divider constituted by a piston mounted movably in a bore, one face of which receives the thrust of a spring and the other face of which receives line pressure, while an axial drilling in the piston ensures the pressurization of the various chambers delimited by the body of the piston and the bore.

Les dispositifs précités ne peuvent être associés entre eux pour constituer un diviseur de débit à partir de simples régulateurs de débit.The aforementioned devices cannot be combined with one another to constitute a flow divider from simple flow regulators.

L'objet de l'invention est une construction de diviseurs de débit permettant de diviser au moyen d'un certain nombre de modules assemblés le circuit conservant une égalité de débit malgré leurs variations individuelles de charge et indépendamment du nombre de divisions réalisées.The object of the invention is a construction of flow dividers making it possible to divide by means of a certain number of assembled modules the circuit retaining an equality of flow despite their individual load variations and independently of the number of divisions carried out.

Ces modules comportent chacun un piston coulissant, contre un ressort qui, comme dans les régulateurs de débit connus, règle sa position et l'ouverture de la section de passage qu'il contrôle en fonction des variations de pression aval, donc de la charge de l'appareil desservi.These modules each comprise a sliding piston, against a spring which, as in known flow regulators, adjusts its position and the opening of the passage section which it controls as a function of downstream pressure variations, therefore of the load of the device served.

L'invention concerne plus particulièrement un élément modulaire hydraulique à orifices d'entrée et de sortie, qui possède des faces de contact d'assemblage et un piston régulateur de débit monté à déplacement axial dans l'alésage d'un cylindre pour régler le débit dans l'orifice de sortie en fonction des variations de la pression dans les orifices d'entrée et de sortie.The invention relates more particularly to a hydraulic modular element with inlet and outlet orifices, which has assembly contact faces and a flow-regulating piston mounted for axial displacement in the bore of a cylinder for regulating the flow. in the outlet port as a function of pressure variations in the inlet and outlet ports.

L'élément modulaire hydraulique précité est caractérisé conformément à l'invention par le fait que l'élément est susceptible d'être utilisé en tant que module pour l'assemblage d'un bloc diviseur de débits comprenant plusieurs modules, que l'alésage des cylindres débouche sur une desdites faces de contact d'assemblage de l'élément et dans l'orifice de sortie en traversant son orifice d'entrée et qu'il communique, par ladite face de contact d'assemblage avec l'orifice de sortie au moyen d'un canal communiquant avec celui-ci et traversant l'élément modulaire entre ses faces de contact d'assemblage pour se raccorder au contact de celles-ci au canal correspondant d'un élément modulaire voisin.The above-mentioned hydraulic modular element is characterized in accordance with the invention by the fact that the element can be used as a module for assembling a flow divider block comprising several modules, that the bore of the cylinders opens onto one of said assembly contact faces of the element and into the outlet orifice passing through its inlet orifice and that it communicates, via said assembly contact face with the outlet orifice at by means of a channel communicating with it and passing through the modular element between its assembly contact faces to connect on contact with these to the corresponding channel of a neighboring modular element.

Un exemple de réalisation de ce module sera décrit ci-dessous en référence aux dessins annexés ou :

  • la figure 1 montre un exemple de branchement de trois modules en fonction des organes qu'ils contrôlent,
  • la figure 2 représente en coupe transversale un assemblage de trois modules.
An exemplary embodiment of this module will be described below with reference to the accompanying drawings or:
  • FIG. 1 shows an example of connection of three modules as a function of the members they control,
  • Figure 2 shows in cross section an assembly of three modules.

Ainsi qu'il apparaît sur ces figures, l'élément modulaire 2 destiné à l'assemblage d'un bloc diviseur de débit hydraulique à orifices d'entrée et de sortie, comporte un piston régulateur de débit 11 réglant l'ouverture du débit de fluide en fonction des variations de la pression amont entre l'orifice d'entrée 3 et de sorties. Il est assemblé à d'autres modules 102, 202 afin que l'alésage du cylindre 7, 107, 207 porteur du piston régulateur 11, 111, 211 débouche dans l'orifice de sortie 5, 105, 205 du module en traversant son orifice d'entrée 3, 103, 203 et qu'il communique, par une face de contact d'assemblage, avec un canal 12, 112, 212 qui est en communication avec l'orifice de sortie et qui traverse l'élément modulaire entre ses faces de contact d'assemblage pour se raccorder au contact de celles-ci au canal correspondant 112, 212 d'un élément modulaire voisin.As shown in these figures, the modular element 2 intended for the assembly of a hydraulic flow divider block with inlet and outlet orifices, comprises a flow regulating piston 11 regulating the opening of the flow of fluid as a function of variations in the upstream pressure between the inlet 3 and outlet ports. It is assembled with other modules 102, 202 so that the bore of the cylinder 7, 107, 207 carrying the regulating piston 11, 111, 211 opens into the outlet orifice 5, 105, 205 of the module by crossing its orifice inlet 3, 103, 203 and that it communicates, via an assembly contact face, with a channel 12, 112, 212 which is in communication with the outlet orifice and which passes through the modular element between its assembly contact faces to connect on contact with them to the corresponding channel 112, 212 of a neighboring modular element.

L'orifice de sortie 5, 105, 205 est fermé par un gicleur amovible 4, 104, 204 choisi en fonction du débit d'utilisation.The outlet 5, 105, 205 is closed by a removable nozzle 4, 104, 204 chosen as a function of the flow of use.

Au repos, en l'absence de débit, un ressort 14, 114, 214 prenant appui sur la face de contact d'assemblage de l'élément voisin pousse le piston régulateur 11, 111, 211 en appui contre la paroi de l'orifice de sortie 5, 105, 205 le mettant en communication ouverte avec l'orifice d'entrée 3, 103, 203.At rest, in the absence of flow, a spring 14, 114, 214 bearing on the assembly contact face of the neighboring element pushes the regulating piston 11, 111, 211 in abutment against the wall of the orifice 5, 105, 205 putting it in open communication with the inlet 3, 103, 203.

Les faces de contact des éléments empilés comportent un lamage9, 109, 209 dans lequel débouche le cylindre 7,107, 207 du piston régulateur 11, 111, 211 et le canal d'égalisation des pressions de sortie 12, 112, 212 les mettant ainsi en communication.The contact faces of the stacked elements include a countersink 9, 109, 209 into which the cylinder 7, 107, 207 of the regulating piston 11, 111, 211 opens and the outlet pressure equalization channel 12, 112, 212 thus putting them in communication .

Ce lamage est muni de moyens d'étanchéité 8, 108, 208 entre les faces d'empilage, tels que des joints toriques.This counterbore is provided with sealing means 8, 108, 208 between the stacking faces, such as O-rings.

Les faces externes des éléments d'extrémité de l'empilage sont fermées, d'une part, par une plaquette 1 recouvrant la face où débouche le cylindre 7 et, d'autre part, par un bouchon 215 fermant l'orifice du canal d'égalisation des pressions de sortie 12, 112, 212.The external faces of the end elements of the stack are closed, on the one hand, by a plate 1 covering the face where the cylinder 7 opens and, on the other hand, by a plug 215 closing the orifice of the channel d equalization of the outlet pressures 12, 112, 212.

Chaque module 2, 102, 202 comporte ainsi un corps dans l'alésage duquel coulisse un piston 11, 111, 211 en appui contre un ressort 14, .114, 214, un gicleur amovible 4, 104, 204 sur la sortie de chaque module, en fonction du débit de l'appareil desservi, et un gicleur fixe 13, 113, 213 également sur la sortie en aval du piston et débitant dans le canal 12, 112, 212 assurant une même pression en extrémité des pistons 11, 111, 211 du côté de leurs ressorts d'appui. Des joints toriques 8, 108, 208 assurent l'étanchéité des conduits débouchant sur les faces d'empilage.Each module 2, 102, 202 thus comprises a body in the bore of which slides a piston 11, 111, 211 bearing against a spring 14,. 114, 214, a removable nozzle 4, 104, 204 on the outlet of each module , depending on the flow rate of the device served, and a fixed nozzle 13, 113, 213 also on the outlet downstream of the piston and delivering into the channel 12, 112, 212 ensuring the same pressure at the end of the pistons 11, 111, 211 on the side of their support springs. O-rings 8, 108, 208 seal the conduits opening onto the stacking faces.

La plaque 1 ferme la face non empilée du dernier module d'extrémité.The plate 1 closes the unstacked face of the last end module.

Le corps de chaque module est un bloc parallélépipédique dans lequel sont pratiqués quatre perçages :

  • - un perçage 6, 106, 206 dans lequel coulisse le piston 11, 111, 211 ;
  • -un perçage3, 103, 203 par où arrive le fluide ;
  • - un perçage 5, 105, 205 par où il ressort ;
  • - un perçage 12, 112, 212 mettant en communication par le lamage 9, 109, 209 recevant les joints toriques 8, 108, 208, la face gauche d'extrémité du piston 11, 111, 211, avec le canal 12, 112, 212.
The body of each module is a parallelepiped block in which four holes are made:
  • - a bore 6, 106, 206 in which the piston 11, 111, 211 slides;
  • -a bore3, 103, 203 through which the fluid arrives;
  • - a bore 5, 105, 205 through which it emerges;
  • a bore 12, 112, 212 putting in communication by the countersinking 9, 109, 209 receiving the O-rings 8, 108, 208, the left end face of the piston 11, 111, 211, with the channel 12, 112, 212.

Le schéma de la figure 1 comporte une pompe P, un distributeur D, trois moteurs hydrauliques M1, M2, M3 et le diviseur selon l'invention qui divise en trois parties égales le débit d'alimentation de ces moteurs par contrôle de leur débit de sortie. Si l'un des moteurs est moins chargé que les autres, sa vitesse augmente. La pression à l'entrée du diviseur augmente alors également.The diagram of FIG. 1 comprises a pump P, a distributor D, three hydraulic motors M1, M2, M3 and the divider according to the invention which divides the supply flow of these motors into three equal parts by controlling their flow of exit. If one of the motors is less loaded than the others, its speed increases. The pressure at the inlet of the divider also increases.

La force des ressorts étant négligeable (ressort d'ouverture sans effort de compression), la face gauche de chaque piston où est placé le ressort tel que 14, 114, 214 est à la pression du canal 12, 112, 212 où règne la pression moyenne en aval des pistons en 6, 16, 26. Les orifices des gicleurs amovibles 4, 104, 204 sont tous identiques, les débits ayant été choisis égaux dans l'exemple décrit.The force of the springs being negligible (opening spring without compressive force), the left face of each piston where the spring is placed such as 14, 114, 214 is at the pressure of the channel 12, 112, 212 where the pressure prevails average downstream of the pistons at 6, 16, 26. The orifices of the removable nozzles 4, 104, 204 are all identical, the flow rates having been chosen equal in the example described.

Pour que les pistons 11, 111, 211 soient en équilibre, il faut que la pression dans le perçage 6 ou 106, 206 soit égal à la pression dans le canal 12 ou 112, 212.So that the pistons 11, 111, 211 are in equilibrium, the pressure in the bore 6 or 106, 206 must be equal to the pressure in the channel 12 or 112, 212.

Lorsque la pression dans le perçage 6 augmente, le piston 11 se déplace vers la gauche à l'encontre de l'action du ressort 14.When the pressure in the bore 6 increases, the piston 11 moves to the left against the action of the spring 14.

Par suite de l'étranglement du passage de fluide entre l'orifice d'entrée 3 et l'orifice de sortie 5, la pression augmente dans l'orifice 3 et repousse le piston vers la droite jusqu'à ce que l'on obtienne l'égalité des pressions précitée qui conditionne l'équilibre du piston 12.As a result of the constriction of the fluid passage between the inlet 3 and the outlet 5, the pressure increases in the hole 3 and pushes the piston to the right until one obtains the above-mentioned equality of pressures which conditions the balance of the piston 12.

Les pressions dans les divers perçages 6, 106, 206 étant identiques, les débits passant les orifices des gicleurs4, 104, 204 seront également identiques et les débits dans les orifices de sortie restent égaux entre eux.The pressures in the various holes 6, 106, 206 being identical, the flow rates passing the orifices of the nozzles4, 104, 204 will also be identical and the flow rates in the outlet orifices remain equal to each other.

En modifiant le diamètre des gicleurs 4, 104, 204 on peut réduire les débits, proportionnellement à la variation de la section des ouvertures des gicleurs.By modifying the diameter of the nozzles 4, 104, 204 it is possible to reduce the flow rates, in proportion to the variation in the section of the openings of the nozzles.

Claims (6)

1. Hydraulic modular element (2) with input (3) and output (5) openings, which element has assembly contact faces and a flow rate-regulating piston (11), axially displaceable in the bore of a cylinder (7) to regulate the flow rate in the output opening (5) as a function of the pressure variations in the input opening (3) and the output opening (5), characterized in that the element (2) is adapted to be used as a module for assembling a flow divider block comprising a plurality of modules (2, 102, 202) ; in that the bore of the cylinder (7, 107, 207) opens on one of said assembly contact faces of the element and into the output opening (5, 105, 205) while extending through its input opening (3, 103, 203) ; and in that it communicates by said assembly contact face with the output opening (5, 105, 205) by means of a channel (12, 112, 212), communicating therewith and extending through the modular element between its assembly contact faces, so as to be connected to the contact thereof with the corresponding channel (112, 212) of an adjacent modular element.
2. Modular element according to Claim 1, characterized in that the output opening (5, 105, 205) has its aperture closed by a removable nozzle (4, 104, 204) selected in accordance with the working flow rate.
3. Modular element according to Claim 1, characterized in that one face of the regulating piston (11, 111, 211) receives pressure from an opening control spring (14, 114, 214) for establishing the flow between the input opening (3, 103, 203) and the output opening (5, 105, 205).
4. Modular element according to Claims 1 or 2, characterized in that one assembly contact face is provided with a recess (109) into which opens the bore (7, 107, 207) of the cylinder carrying the regulating piston (11, 111, 211) and the channel (12, 112, 212) communicating with the output opening.
5. Modular element according to Claim 4, characterized in that the recess (109) is provided with sealing means (8, 108, 208) between the contact faces of the assembly.
6. Flow divider comprising modular elements according to Claim 1, characterized in that the extreme outside faces of the exterior modules (2, 202) are respectively closed by a cover (1) and a plug (215) on the level of the bore (7) of the cylinder of the regulating piston (11) and of the channel (212) communicating with an output opening (205).
EP79400013A 1978-01-16 1979-01-05 Modular element for hydraulic flow distributor Expired EP0003196B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7801047A FR2414674A1 (en) 1978-01-16 1978-01-16 MODULAR ELEMENT FOR HYDRAULIC FLOW DISTRIBUTION BLOCK
FR7801047 1978-01-16

Publications (2)

Publication Number Publication Date
EP0003196A1 EP0003196A1 (en) 1979-07-25
EP0003196B1 true EP0003196B1 (en) 1983-01-26

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ID=9203474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400013A Expired EP0003196B1 (en) 1978-01-16 1979-01-05 Modular element for hydraulic flow distributor

Country Status (5)

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US (1) US4240456A (en)
EP (1) EP0003196B1 (en)
DE (1) DE2964576D1 (en)
ES (1) ES476603A1 (en)
FR (1) FR2414674A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU187852B (en) * 1983-02-01 1986-02-28 Danuvia Koezponti Szerszam- Es Keszuelekgyar,Hu Hydraulic current divider/summator for two or more than two loads with control slide valves of unit control edge

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313797A (en) * 1941-07-01 1943-03-16 Phillips Petroleum Co Blending apparatus
US2606066A (en) * 1947-04-03 1952-08-05 Bendix Aviat Corp Automatic flow regulator
US2662541A (en) * 1948-02-28 1953-12-15 Thompson Prod Inc Flow controlling apparatus
DE1262883C2 (en) * 1965-12-18 1975-02-13 Fa. Louis Schierholz, 2800 Bremen DEVICE FOR THE SYNCHRONOUS DRIVE OF CONVEYORS IN CONVEYOR SYSTEMS FOR CONVEYING MANURE AND SIMILAR FIBER-SHAPED GOODS
US3530883A (en) * 1968-03-08 1970-09-29 Bosch Gmbh Robert Fluid flow control apparatus
CH532724A (en) * 1970-11-25 1973-01-15 Dordoni Innocente Component for pneumatic logic circuits with two distinct Consensus Commands
GB1423824A (en) * 1972-03-10 1976-02-04 Lucas Industries Ltd Fluid feed systems
US3818921A (en) * 1972-09-15 1974-06-25 Bendix Corp Fluid flow throttling valve
DE2302267B1 (en) * 1973-01-18 1974-06-12 Abex Gmbh Denison, 4010 Hilden Line column for hydraulic valves
DE2356414A1 (en) * 1973-11-12 1975-05-15 Peiner Masch Schrauben Flow divider for pressure medium from pump - has control valve with double-acting piston control ducts double valve and changeover valve
US3976098A (en) * 1974-01-02 1976-08-24 International Basic Economy Corporation Hydraulic motor control apparatus
GB1484990A (en) * 1974-10-04 1977-09-08 Smiths Industries Ltd Hydraulic systems

Also Published As

Publication number Publication date
ES476603A1 (en) 1979-05-16
US4240456A (en) 1980-12-23
DE2964576D1 (en) 1983-03-03
EP0003196A1 (en) 1979-07-25
FR2414674A1 (en) 1979-08-10
FR2414674B1 (en) 1982-05-14

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