Storage tank flow control valve

Details Storage tank flow control valve Storage tank flow control valve

1990-06-06

1991-07-23

Recla, Henry J.

Fluent material handling, with receiver or receiver coacting mea

Automatic control of flow cutoff or diversion

Level or overflow responsive

137430, 137423, 137421, 251212, 251297, 141200, 141220, 141205, B65B 5706, F16K 3108

Patent

active

050335197

ABSTRACT:
A float actuated valve for automatically shutting off the flow of fluid into a storage tank when the tank is filled to a predetermined level includes a pair of shutter plates movable transversely across the flow passage from an open position wherein the plates are retracted clear of opposite sides of the passage and a fully closed position in which the plates project into and cooperatively block the passage. A spring biased rotary trip plate underlying the shutter plates controls actuation of the shutter plates and may be held by first and second detents in rotative positions locating the shutter plates in the fully closed or a partially closed position. A lower float located within the tank releases the first detent to cause the trip plate to drive the shutter plates from the fully closed to the partially closed position when the level of fluid in the tank rises to a first level. Upon a further rise of the level of fluid in the tank at a reduced rate due to the partial closure of the shutter plates, an upper float releases the second detent to enable the trip plate to rotate under the biasing action of the spring to drive the shutter plates to the fully closed position. A latch mechanism operable by the upper float latches the trip plate against any substantial movement in a direction opening the shutter plates until the upper float is lowered by withdrawal of fluid from the tank. Upon release of the latch mechanism, a manually operable reset mechanism may be employed to fully open the shutter plates.

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