Pumping arrangements

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F04B 9/10 (2006.01) F04B 9/113 (2006.01) F04B 9/117 (2006.01) F04B 23/06 (2006.01)

Patent

CA 1259522

ABSTRACT Apparatus for providing a variable supply of water under pressure to an hydraulic ring main pressure fluid circuit in, for example, a coal mine, comprises a reciprocating pump in said ring main and an hydraulic reciprocating motor for driving said pump mechanically coupled to said pump, the motor being operated by a variable displacement pump connected in a closed circuit with said motor.

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