초록 ▼

A two-stage float actuated shut-off valve for use in underground fuel storage tanks utilizes a drop tube coaxially mounted within the storage tank fill pipe. Fuel flowing into the tank is passed through the drop tube which projects downwardly into the interior of the tank to a valve housing located

A two-stage float actuated shut-off valve for use in underground fuel storage tanks utilizes a drop tube coaxially mounted within the storage tank fill pipe. Fuel flowing into the tank is passed through the drop tube which projects downwardly into the interior of the tank to a valve housing located at the lower end of the drop tube. Floats slidably mounted in a recessed area in the housing outside of the drop tube within the tank independently operate pivoted valve doors to a closed position within the valve housing, a lower float closing one valve door to block a major portion of incoming fuel flow passage when the level of fuel in the storage tank reaches a predetermined first level and a second upper float causing the secondary valve door to overlap an aperture in the main valve door to almost completely close the flow of fuel to the tank.

대표청구항 ▼

A valve assembly for preventing overfilling of a liquid storage tank in series with piping for introducing liquid into the tank, comprising: an elongated housing defining a liquid flow passageway extending longitudinally thereof, a liquid inlet communicating with said passageway adjacent one end the

A valve assembly for preventing overfilling of a liquid storage tank in series with piping for introducing liquid into the tank, comprising: an elongated housing defining a liquid flow passageway extending longitudinally thereof, a liquid inlet communicating with said passageway adjacent one end thereof, a single liquid outlet communicating with said passageway adjacent the other end thereof; float means for moving to predefined positions in response to a liquid level within said tank; compound valve means having a main valve assembly and a secondary valve assembly, each valve assembly having an open position and a closed position, said main valve assembly significantly reducing flow of liquid from said passageway through said outlet when in said closed position, said secondary valve assembly blocking significant flow of liquid from said passageway through said outlet when in said closed position, wherein said compound valve means further comprises said main valve assembly and said secondary valve assembly having a common horizontal pivot axis; and valve control means, connected to said float means, for controlling operation of said compound valve means.