Dosatron International

Sébastien Furet

Christophe Charriere

Philippe Duquennoy

Dominique Berton

Matthieu Darbois

Sandrine Lambinet

Najib Laatiaoui

David Vacher

Manal Badii

A hydraulic machine includes: a casing; a differential piston having an upper ring and a lower base, sliding reciprocally in the casing and a cylindrical housing inside the envelope, separating two chambers of the casing; a hydraulic switch conveying liquid to/from the chambers, the switch controlled by movement of the piston and including at least one rod acting on a distribution member that includes an upper valve cooperating with a first seat in the upper ring of the piston and at least one lower valve cooperating with a second seat in the lower base of the piston; and a trigger causing, at the end of the stroke, a sudden change in the position of the switch to reverse the stroke. The lower and upper valve seats accept upper and lower frustoconical portions and a lower frustoconical portion tapering in opposite directions. Also disclosed is a reversible metering pump.

Hydraulic machine and reversible metering pump equipped with such a machine

Hydraulic machine, in particular hydraulic motor, comprising a casing, a differential piston () having a region of large cross section and a region of smaller cross section, which can slide with a reciprocating movement respectively in the casing and in a housing coaxial to, and of smaller diameter than, the casing, the piston separating two chambers of the casing and being provided at the location of its large cross section and its small cross section with sealing lips () which are oriented in opposite directions and which face one another. The sealing lips () are provided on detachable circular rings (), and the piston () is molded in one piece.

Hydraulic machine, in particular hydraulic motor, with a reciprocating movement, and differential piston for such a machine

Hydraulic machine includes: a casing; a piston slidable therein and separating two chambers; hydraulic switching elements for supplying liquid to and for evacuating the chambers, including at least one connecting rod acting on a distribution member which can adopt two stable positions; and initiating elements having a pusher which, at the end of the piston stroke, can cause a sudden change in the position of the switching elements, under the action of an elastic member to reverse the stroke. Each end of the elastic member is secured to an articulation member respectively accommodated in a housing provided on the connecting rod and on another moving part, each housing being open in a direction substantially opposed to the direction of the force exerted by the elastic member, such that each articulation member can be removed from its open housing against the action of the force, thereby simplifying assembly and disassembly.

Hydraulic machine, in particular hydraulic motor, with a reciprocating movement

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Bruges, France

Sébastien Furet