Combined fixed and variable displacement pump system

Details Combined fixed and variable displacement pump system Combined fixed and variable displacement pump system

1976-05-04

1977-09-27

Freeh, William L.

Fluid handling

Systems

Multi-way valve unit

13762569, B67D 546

Patent

active

040504786

ABSTRACT:
A hydraulic pump arrangement and control circuit for supplying fluid at high volume and a high pressure to a work circuit. The system utilizes a fixed displacement pump, a variable displcement pump, a dual pressure compensator, and an unloading valve working together to provide high pressure fluid delivery while reducing the horsepower requirements of the fixed displacement pump and the variable displacement pump. High flow is provided through the utilization of the combined pumps and high pressure is attained through the unloading of the fixed displacement pump through the unloading valve and destroking of the variable displacement pump in response to signals provided by the dual pressure compensator.

REFERENCES:
patent: 2722234 (1955-11-01), Macgeorge et al.
patent: 3100508 (1963-08-01), Mercier
patent: 3213881 (1965-10-01), Findlay et al.
patent: 3568718 (1971-03-01), Wilke
patent: 3706322 (1972-12-01), Carlson
patent: 3958495 (1976-05-01), Bernhoft

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