Downhole pump of constant differential hydraulic pressure

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

1993-03-04

1994-03-01

Bertsch, Richard A.

Pumps

Expansible chamber type

Plural pumping chambers

F04B 2304

Patent

active

052901599

ABSTRACT:
A combination low-pressure, high-pressure hydraulic pump which allows a constant differntial 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.

REFERENCES:
patent: 753530 (1904-03-01), Ten Eyck
patent: 1969920 (1934-08-01), Andrews
patent: 2023771 (1935-12-01), Ringius
patent: 2434296 (1948-01-01), Swanson
patent: 3101873 (1963-08-01), Hunt
patent: 3665808 (1972-05-01), Vestal
patent: 3777814 (1973-12-01), Gustavson et al.
patent: 4173437 (1979-11-01), Leka et al.
patent: 4457367 (1984-07-01), Brandell
patent: 4568250 (1986-02-01), Falk et al.
patent: 4664186 (1987-05-01), Roeder
patent: 5017105 (1991-05-01), Rottel

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