Pumps – Processes
Reexamination Certificate
2004-10-12
2008-10-07
Freay, Charles G (Department: 3746)
Pumps
Processes
C417S063000, C073S037000, C060S039091, C060S039281
Reexamination Certificate
active
07431569
ABSTRACT:
A method of monitoring the health of a positive displacement hydraulic pump comprising the steps of:establishing a flow path having a known flow number between a high pressure outlet line of the pump (and a low pressure line of the system;progressively changing the speed of operation of the pump; and,noting the speed of operation of the pump at a parameter responsive to the output pressure of the pump changes in response to said change in rotational speed of the pump.
REFERENCES:
patent: 4129037 (1978-12-01), Toalson
patent: 4705459 (1987-11-01), Buisine et al.
patent: 5112196 (1992-05-01), Schuh
patent: 7204076 (2007-04-01), Griffiths et al.
patent: 386 483 (1988-08-01), None
patent: 2 314 412 (1997-12-01), None
patent: 2000205141 (2000-07-01), None
Andrus Sceales Starke & Sawall LLP
Freay Charles G
Goodrich Control Systems Limited
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