Apparatus and method for ganging multiple open circuit pumps

Details Apparatus and method for ganging multiple open circuit pumps Apparatus and method for ganging multiple open circuit pumps

1998-02-13

2000-08-29

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

60452, F16D 3102

Patent

active

061090301

ABSTRACT:
A ganged pumping apparatus includes first and second variable displacement open circuit pumps, each having a load sensing control and a servo actuator together for changing the fluid displacement of each pump respectively. The load sensing controls being adjusted so that the setting of the control on the second pump is lower than the setting of the control on the first pump. The servo actuator of the first pump having over-center capability, allowing the first pump to operate with negative fluid displacement, and the servo actuator of the second pump having a stop to limit minimum displacement to non-negative or zero displacement. A single pressure compensating pilot valve disposed in the first pump provides the pressure compensation function of both pumps. A pilot signal line interconnects the pressure compensating pilot valve, the load sensing controls, and a load such that the flow output of the pumps is combinable into a single output and functions as a single large displacement pump. A method of ganging and phasing the pumps is also disclosed.

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