De-sludging systems

F - Mech Eng,Light,Heat,Weapons – 04 – B

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F04B 1/00 (2006.01) B01D 21/00 (2006.01) F04B 9/105 (2006.01) F04B 15/02 (2006.01) F04B 49/06 (2006.01)

Patent

CA 2035255

Apparatus for periodically drawing accumulated sludge (12) from a settlement tank (10) includes a hydraulically powered ram type positive displacement pump (14), operation thereof being controlled automatically in a timed or other sequence in response to signals derived from a pressure transducer (34), conveniently in the hydraulic supply line (24), said signals being a function of the pressure exerted by the pump ram (22) in operation and hence the density or other properties of the material being handled by the pump, a higher pressure showing the presence of sludge and a lower pressure its absence.

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