Societe Nationale Elf Aquitaine (production)

Alain Viard

Alain Lechon

The device comprises a head 1 containing a cavity 2 and a sleeve 4, and a hollow body 3, inside which is lockingly housed a hollow mandril 6 fixed to a load to be carried and comprising a valving piston 17. Inside sleeve 4 is housed a mobile piston 31 whose head 32 slides in cavity 2. Pipes 27, 28, 29 pass through the cavity 2, whereas, opposite these pipes, housings 320 are formed in the piston 31 for allowing the piston to slide along the pipes. These housings are extended by ducts 33, 34, 35 opening laterally into the face of the piston 31 through orifices 36, 37. Inside mandril 6 are provided longitudinal high pressure fluid ducts 39, 40 for connection to the user circuits. The lateral face of the valving piston 17 comprises annular seals 44, 45, 46 intended to close off, in the raised position of piston 31, the annular zones corresponding to the orifices through which ducts 39, 40 open out and which communicate in the low position of 31 with the orifices 36, 37. The device provides sealing connection of hydraulic circuits and protection of the parts of loads carried against corrosion of the environment.

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Muret, France

Alain Viard