F - Mech Eng,Light,Heat,Weapons – 03 – B
Patent
F - Mech Eng,Light,Heat,Weapons
03
B
138/52
F03B 17/02 (2006.01) B01D 29/41 (2006.01) F01L 21/04 (2006.01) F03C 1/007 (2006.01) F15B 15/08 (2006.01)
Patent
CA 1136957
ABSTRACT OF DISCLOSURE A hydraulic engine for driving a self-cleaning filter has piston movable with an automatically controlled reciprocate motion inside a cylinder into the walls of which issue a pressurized hydraulic fluid supply pipe and an exhaust pipe for the hydraulic fluid. The piston defines with the cylinder two chambers to receive the hydraulic fluid and has drive members parallel to the piston axis and sliding therein. The driving members ensure the selective and successive communication of the supply pipe and exhaust pipe with each one of the chambers, via conduits provided inside the piston. The piston has a central core and a sleeve mounted in sealed manner on the core, the core being provided on its periphery with at least three annular grooved portions forming with the inside wall of the sleeve three annular fluid-tight grooves. The middle groove is in permanent communication with the exhaust pipe and the two adjacent grooves are in permanent communication with the supply pipe. The middle groove and one of the two adjacent grooves are selectively and respectively connected with the two chambers of the cylinder via a slide valve mounted in the piston, and the valve has outlets respectively connected to the two chambers via conduits provided in the core of the piston and issuing on to each of the faces thereof.
354849
Alfa Laval Moatti Snc
Gowling Lafleur Henderson Llp
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