Abstract: A control device provides a reliable way of pressure controlling a hydraulic distributor and an associated first hydraulic circuit when pressurized hydraulic fluid is simultaneously supplied to at least one other hydraulic circuit. Pilot pressure oil enters and exits the distributor through inlet and outlet passages in the pilot line. An apparatus for regulating pilot oil flow rate is interposed between the pilot line inlet passage and the hydraulic fluid line. The device includes a pressure head detection apparatus having inlet ends connected to the pilot line inlet passage and to the hydraulic circuit and an outlet end connected to the hydraulic fluid source for controlling the flow rate of the hydraulic fluid based on the highest pressure requirement.

Abstract: Method for compensating an output signal of a photoelectric sensor having a drift due to aging a drift in temperature and a signal in absence of optical excitation (dark signal), in an electrical proportional remote control apparatus of the manipulation or analog type comprising an actuation member or actuation part for progressive displacement functionally associated to at least one photoelectric sensor adapted to generate an electrical signal of which one parameter is representative for the displacement and/or the position of said actuation member.

Abstract: A pressure compensating hydraulic directional valve comprising: a body provided with a movable slide; a passage through the body for connecting a distribution chamber associated with the slide to working orifices, the distribution chamber being selectively connectable to an admission orifice by the slide when moved; a load sensing line channel combined with means for selecting the maximum pressure selected from the pressure in the channel and the pressure of the fluid in the valve; and pressure compensating means placed in the passage and responsive to the difference between the pressure in the passage and the pressure in the channel to generate a fixed pressure drop in the pressurized fluid flowing through the passage towards the working orifices, the pressure compensating means being combined with the maximum pressure selecting means in such a manner that if the pressure in the channel is greater than or equal to the pressure of the fluid from the slide, then no communication exists between the passage and

Abstract: A hydraulic remote control distributor valve device comprises a flat body (1) having two main assembly faces (3) to enable a multiple hydraulic remote control block to be built up, and two side faces and a bottom face (5) that are narrow and on which orifices are located for receiving link couplings for hydraulic connection with a source of hydraulic fluid under pressure and with a component to be controlled. Two outlet orifices (A, B) are situated on the bottom face of the body (5) and the width e of the bottom face (5) is less than the diameter d of the link couplings suitable for fixing on the outlet orifices. The two outlet orifices (A, B) are disposed asymmetrically relative to the median plane (M) of the body (1) that extends perpendicularly to the main faces and to the bottom face (5), said orifices being offset relative to the plane (M) by an offset 1 that is equal to or greater than 1/2.sqroot.(d.sup.2 -e.sup.2).

Abstract: An electric remote control device (20) includes sliding pushers (27) associated two by two and actuated from an actuating member. Each pusher is associated with a converter for generating an electric signal, a parameter of which is representative of the movement and/or position of the pusher and a signal processor (33) processes the signal produced at the output of the converter. The device provides for storing a defining equation between the position of the actuating member and the parameter of the output signal and the device includes a first storage unit (35) for storing the value of the parameter of the output signal of the converter when the actuating member is in a neutral position, corresponding to zero movement of the pusher, and a second storage (36) unit for storing the value of the parameter of the output signal of the converter when the actuating member is in an endmost position corresponding to maximum movement of the pusher.

Abstract: System for regulating the mean current flowing through a load (1), particularly an electric device controlling the phenomenon to be regulated, from initial variable control information (.alpha.), a DC voltage source (V.sub.alim) being provided for supplying this load, comprising: a measuring device (4) for permanently measuring the value of the variable information (.alpha.); a determination device (5, 6) for causing a mean theoretical current value to be applied to the load (1) to correspond to each value of the information (.alpha.

Abstract: An electric remote control device (20), includes a metal body (25) containing sliding pushers (27) associated two by two and actuated from an actuating member (22). Each pusher is associated with a converter for generating an electric signal one parameter of which is representative of the movement and/or position of the pusher. A signal processor processes the signal collected at the output of the receiver. At the end of the metal body (25) opposite the actuating member is provided a metal base (35) through which pass the rods of the pushers (27) associated with the converter. At least one printed circuit board (40), supporting the electronic components, in particular those of the converter and the signal processor, is disposed substantially perpendicularly to the base (35) in the central zone thereof, between and/or along the rods of the pushers (27). Supports (39) made from heat conducting material are fixed for heat conducting to the base and support the printed circuit boards.

Abstract: The invention relates to a pressurized hydraulic fluid spool valve intended to be stacked against other similar spool valves, having a valve body (1) with a spool (4) adapted for sliding in a bore (5) into which open in the following order: a first intake recess (19) in a central position, two second recesses (21A, 21B) for connection to a hydraulic apparatus situated on each side of the preceding one; two third recesses (T.sub.1, T.sub.2) situated respectively beyond the second recesses, and two fourth recesses (22.sub.1, 22.sub.2) situated respectively beyond the third recesses.

Abstract: The machine casing (1) comprises at least two casing parts (2; 3, 4) assembled mechanically together by clamping members (5, 6), the two casing parts being both made from metal, one at least (2) of these two casing parts (first part) being subjected to deforming forces likely to cause relative micromovements of the two opposite faces of these two casing parts, said first part (2) being made from a metal of relatively low hardness. Between the opposite faces of the two casing parts is inserted a plate (7) corresponding to the contour of the opposite faces of the two casing parts but having an area substantially less than that of the surface of said opposite faces of the two casing parts; the plate (7) is made from a metal of a hardness greater than that of a metal forming said part (2) and the corresponding edge (8;9) of the plate is sufficiently sharp to bite into the metal of relatively low hardness.

Abstract: The fluid distributor (D1) is intended to be stacked against similar distributors (D2); it comprises a distributor body (1) in which a slide-valve (2) may slide; this body comprises a transverse channel (8) extending from one bearing face (3) to another bearing face (4), this channel (8) being intended to be combined with at least one pressure selector (S); an upstream housing (9) is connected by a duct (10) to a zone where a working pressure is established, this upstream housing (9) being further connected laterally to said channel (8). The distributor body (1) comprises on its face (3), intended to be turned downstream, a downstream housing (16) communicating with the transverse channel (8), the upstream housing (9) of a downstream distributor (D1) coming, in a stack, opposite the downstream housing (16) of the adjacent upstream distributor (D2) so as to form the pressure selector (S).

Abstract: The fluid distributing device, more especially for remote control, comprises a body (2) having bores (3) with parallel axes in which are slidably mounted slide valves (4) associated in pairs and controlled by push-rods (5) actuated by an oscillating cam (6). Each slide valve bore (3) has a groove (8) connected to the pressurized fluid intake, each slide valve being combined with a chamber (9) limited by at least one transverse annular surface (b) of the slide valve and connected to the reservoir by a constriction.

Abstract: Distributor comprising a body provided at least with one pressurized fluid inlet port (P), one return port for the fluid to a tank (T), two connecting ports (A, B) to a hydraulic apparatus or component, and a slide valve adapted to slide in a bore of the distributor body, and comprising locking means (B) for the slide valve and unlocking means actuated mechanically. The slide valve is formed of at least two parts assembled rigidly to one another and a pressure selector (S) is arranged inside the slide valve, this pressure selector comprising two inlets and an outlet, and being adapted to compare the two pressures on its inlets and to provide, at its outlet, the highest pressure, connecting means being provided in the distributor body and in the slide valve to connect the two inlets of the selector respectively to the two connecting ports (B, A) of the distributor, and to connect the outlet from the selector to a channel opening outside the distributor body.

Abstract: A distributor comprising a pressure reducer mounted in a body and a control member, capable of modifying the calibration of the reducer, which comprises a plunger movable in a cavity, which comprises, on one side, a housing where the reducer calibrating means are placed, and, on the other side, a bore in which an active part of the plunger can be moved.The body 3 of the distributor is formed from two parts 3a, 3b independent of each other and connected by assembly means A; these two parts are separated by a surface S passing through housing 13 connected to the low-pressure, but located in the vicinity of one end of bore 18 connected to the pressurized zone.Application to hydraulic distributors, particularly for public works equipment.

Abstract: A gear pump or motor comprises a tubular casing having an internal shoulder and an inlet and outlet for working fluid. A pair of meshing gearwheels are each mounted in the casing between a pair of rigid bearings which are disposed one on either side of the shoulder adjacent respective end plates closing the ends of the casing. Screws passing through the shoulder are provided for clamping the shoulder between the bearings and end plates. In an unclamped condition of the shoulder, the difference between the axial lengths of the shoulder and the gearwheels is greater than a predetermined operating clearance between the gearwheels and the bearings. In a clamped condition of the shoulder in the normal operating conditions of the pump or motor, the shoulder is resiliently deformed to reduce the said difference to a value at most equal to the predetermined clearance.