Pump control override for tandem pumps

Details Pump control override for tandem pumps Pump control override for tandem pumps

2007-01-23

2007-01-23

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

C060S486000

Reexamination Certificate

active

10618417

ABSTRACT:
A tandem pump assembly of the type including a housing (H), disposed in which is a first pump (11), driven by an input shaft (19), and a second pump (33), also driven by the input shaft (19). The assembly is characterized by the tandem pump assembly including pressure override valve means (71,73) associated with only the first pump (11), and operable, in response to a fluid pressure at a fluid outlet port (35) in excess of a pressure override setting (79), to communicate pressurized fluid to a first fluid pressure responsive means (31), in a manner tending to decrease the displacement of the first pump (11) without effecting the displacement of the second pump (33), until said fluid pressure is substantially equal to the pressure override selling (79), even if it is necessary for the first pump (11) to go over-center from its initial displacement.

REFERENCES:
patent: 3941514 (1976-03-01), Louis et al.
patent: 3985472 (1976-10-01), Virtue et al.
patent: 4936095 (1990-06-01), Ross et al.
patent: 6082107 (2000-07-01), Schniederjan et al.
patent: 6109030 (2000-08-01), Geringer
patent: 6170261 (2001-01-01), Ishizaki et al.

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