Valves and valve actuation – Electrically actuated valve – Rotary electric actuator
Patent
1998-04-24
2000-05-09
Rivell, John
Valves and valve actuation
Electrically actuated valve
Rotary electric actuator
318453, 454 61, F16K 3104
Patent
active
060592605
ABSTRACT:
A fume hood exhaust terminal for controlling gas flow in an exhaust duct has an electrically powered ultrasonic motor driven actuator for angularly positioning a damper in the terminal. The circuitry of the terminal includes a power failure detection circuit which includes the capability of storing sufficient power to place the damper in a preferred position until power is restored to the exhaust terminal.
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R.J. Babyak, "Motor, Fans & Blowers", Appliance Manufacturer, Mar. 1994.
Gorski William H.
Jacob Steven D.
Rivell John
Siemens Building Technologies Inc.
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