Downhole pump of constant differential hydraulic pressure

Details Downhole pump of constant differential hydraulic pressure Downhole pump of constant differential hydraulic pressure

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 47/06 (2006.01) F04B 5/00 (2006.01) F04B 23/04 (2006.01) F04B 49/12 (2006.01)

Patent

CA 2108531

A combination low-pressure, high-pressure hydraulic pump which allows a constant differential pressure is disclosed. This pump features dual concentric pistons, each with its own chamber. The pistons reciprocate together at low pressures; as the system pressure increases, a spring resists the stroke of the low pressure piston, so that ultimately only the smaller, high pressure piston reciprocates.

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