Automatic test system for check valve closure in pump for liquid

Details Automatic test system for check valve closure in pump for liquid Automatic test system for check valve closure in pump for liquid

1988-01-11

1989-05-23

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 20, 417 22, 417 53, 2101982, F04B 4906, F04B 4910

Patent

active

048325759

ABSTRACT:
There is disclosed herein a pump check valve test system embodied in a pump control system which control pump speed based upon actual pressure and upon actual pump speed and desired flow rate. The check valve test system disables the portion of the control system which controls pump speed based upon desired flow rate during the test. The test is comprised of timing the time it takes the pump to rotate through the portion of each cycle wherein the check valve is supposed to close and comparing this time to a known value.

REFERENCES:
patent: 3779457 (1973-12-01), Cornyn, Jr. et al.
patent: 4128847 (1978-12-01), Rock
patent: 4137011 (1979-01-01), Rock
patent: 4255088 (1981-03-01), Newton et al.
patent: 4359312 (1982-11-01), Funke et al.
patent: 4420393 (1983-12-01), Smith
patent: 4552513 (1985-11-01), Miller et al.
patent: 4600365 (1986-07-01), Riggenmann
patent: 4705459 (1987-11-01), Buisine
Spectra-Physics SP8700 Solvent Delivery System, 12 pages, published for Spectra-Physics.

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