Combined hydraulic motor and pump - recovers flow-energy from concentrate stream in reverse osmosis sepn. systems

摘要

In the device which has a reciprocating piston compressing a product stream with its working end in a working cylinder in a conventional way, the driven end of the piston is simultaneously driven by the concentrate stream which is under high press. in the drive cylinder. The product outlet and the concentrate stream inlet are simultaneously controlled conventionally by a double acting valve comprising press. valve seat, valve seat, valve discs, and valve disc connecting rod and valve spring. Either the driven end of the piston extends outside the housing through hole on the concentrate side, or the working end through hole on the product side. The use of the same piston for both driven and work functions eliminates the efficiency losses associated with separate pistons connected through a coupling.