Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1981-06-08
1983-08-30
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
417 44, 417 38, F04B 4902, F04B 4908
Patent
active
044014139
ABSTRACT:
A switch device for an air compressor plant including an air receiver, an air compressor having an unloader valve mechanism, an electrical motor for driving the compressor, and an electrical supply circuit including a main line for energizing the motor and a pair of capacitor circuits, comprising a pneumatically actuated air valve in an air line between the air receiver and the unloader valve mechanism, in which the air valve is adapted to be opened when excessive pressure is developed in the air receiver for supplying air through an unloader control line to the unloader mechanism. Also, included in the unloader air line is a pneumatic switch actuator device adapted to automatically and simultaneously open switches in the main supply line circuit and the capacitor circuits when the air valve is open. The unloader control air line is also supplied with a relief or exhaust valve which has a normally closed position when the air valve is open, and an open exhaust position for exhausting the unloader control air line as well as the switch actuator device when the air valve is closed.
REFERENCES:
patent: 1315433 (1919-09-01), Tatum
patent: 1473078 (1923-11-01), Clapp
patent: 1521034 (1924-12-01), Maxson
patent: 1910202 (1933-05-01), Crago
patent: 2389348 (1945-11-01), Dustin
patent: 2446740 (1948-08-01), Burns
patent: 3072319 (1963-01-01), Cox et al.
patent: 3334285 (1967-08-01), Blake
Freeh William L.
Lackey Harrington A.
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