Multistage gear pump and control valve arrangement

Details Multistage gear pump and control valve arrangement Multistage gear pump and control valve arrangement

1983-03-24

1985-03-05

Gluck, Richard E.

Pumps

With condition responsive pumped fluid control

Plural pump units with individual or relative control

417428, F04B 4908

Patent

active

045028451

ABSTRACT:
There is disclosed a multistage gear pump and control valve arrangement comprising two hydraulic gear pump sets each having a suction port connected to a common sump and a discharge port for delivering hydraulic fluid to a circuit line. Only one of the discharge ports is continuously open to the circuit line while a check valve operates to connect the other of the discharge ports to the circuit line and prevent reverse flow. A regulator valve regulates the pump discharge to the circuit line by diverting fluid therefrom in response to circuit line pressure below a predetermined setting while both the discharge ports are delivering fluid thereto and by being responsive to circuit line pressures thereabove to connect the other discharge port to the sump to thereby relieve the associated gear pump set of hydraulic work while again regulating the pump discharge to the circuit line by diverting fluid therefrom but with only the one discharge port delivering fluid thereto.

REFERENCES:
patent: 4204811 (1980-05-01), Carter et al.
patent: 4245964 (1981-01-01), Rannenberg

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