Fluid handling – Liquid level responsive or maintaining systems – Electrical characteristic sensing
Patent
1985-03-18
1986-11-25
Cohan, Alan
Fluid handling
Liquid level responsive or maintaining systems
Electrical characteristic sensing
1374875, 25112912, F16K 3104
Patent
active
046242805
ABSTRACT:
There is disclosed a system for automatically closing a gate valve of the type customarily installed in a sewer pipe system, the gate valve being positioned such as to divide the pipe into a forward exit section and a rear exit section, the system including fluid sensing means positioned in the forward exit section of the pipe adapted to sense the fluid level, a two phase motor having a forward phase and a reverse phase operationally associated with the gate valve for alternately opening and closing the gate valve, electrical means interconnecting the fluid sensing means and the motor to activate the motor in response to the fluid level sensed by the fluid sensing means, the motor including switch activation means associated therewith and mounted for arcuate movement about a pivot point, and switch means for alternately controlling the forward and reverse phases of the motor, the switch means being mounted in position within the arcuate path of travel of the switch activation means.
REFERENCES:
patent: 2059635 (1930-11-01), Fillo
patent: 2483322 (1949-09-01), Miller
patent: 3180358 (1965-04-01), Cogdell
patent: 3616884 (1971-11-01), Jurge
patent: 3862739 (1975-01-01), Fujiwara
Cohan Alan
Demeur Basil E.
Knechtel Robert E.
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