Pumps – With signal – indicator – or inspection means
Patent
1987-06-03
1988-04-26
Vrablik, John J.
Pumps
With signal, indicator, or inspection means
417310, 137552, 137554, 137557, 116268, 210 90, 340607, F04B 2102, F04B 4902, B01D 3514, F16K 3700
Patent
active
047401400
ABSTRACT:
To provide a filter bypass and indicator, in a pump having an inlet and an outlet with a filter therein, a bypass port is in communication with the outlet upstream of the filter. A bypass valve assembly is provided in the bypass port and is normally in a closed position to direct all flow from the pump inlet through the filter. The bypass valve assembly opens in response to a preselected pressure differential across the filter to divert at least a portion of flow from the inlet around the filter. In addition, the bypass valve assembly includes a switch actuator and the pump includes a switch positioned in proximity to the bypass valve assembly so as to be operable in response to movement of the switch actuator.
REFERENCES:
patent: 2305519 (1942-12-01), Dunmire
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patent: 3146720 (1964-09-01), Henry
patent: 3182596 (1965-05-01), Prijatel
patent: 3566901 (1971-03-01), Swedberg
patent: 3626474 (1971-12-01), Hammer
patent: 3644915 (1972-02-01), McBurnett
patent: 3828812 (1974-08-01), Read
patent: 3896280 (1975-07-01), Blake
patent: 3970104 (1976-07-01), Decker et al.
patent: 4255093 (1981-03-01), Erikson
patent: 4284386 (1981-08-01), Hudson
patent: 4423751 (1984-01-01), Roettgen
Sundstrand Corporation
Vrablik John J.
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