Emco Wheaton Gmbh

Emco, Inc.

Leonard W Swain

Allen M Bower

David T Fenton

In a liquid loading system for the gravity loading of a liquid storage tank from a tank truck the present invention provides an improved mechanism for interrupting the flow of liquid when the level of liquid in a tank rises above a predetermined level. The structure includes a valve in the fill line which is moveable between an open position and closed position. A pressure responsive latch means is provided for releasably locking the valve in the open position. A vent passage communicates between the pressure responsive latch means and a predetermined level below the upper end of the underground storage tank. A vacuum passage communicates between the vent passage and a vacuum source in the fill line. The flow of liquid through the liquid fill line generates the vacuum in the fill line in the area of the vacuum passage. Until the level of liquid in the underground tank rises above the end of the vent passage, atmosphere from within the tank is drawn into the vacuum passage from the vent passage. When the level of liquid in the tank rises above the end of the vent passage the vacuum pressure is applied to the pressure responsive latch means to release the valve which moves automatically to the closed position to interrupt the flow of liquid.

Automatic shut off for gravity filling system for liquid storage tanks

In a dispenser nozzle having, a main body portion, a filling tube projecting from one end of said main body portion, and a liquid flow passage extending through said main body and said filling tube, the filling tube being adapted to be located within the open end of a neck of a fuel storage tank of a vehicle or the like, a control valve mechanism for controlling the flow of liquid through said liquid flow passage, said mechanism including a valve operating mechanism and latching means for releasably engaging said valve operating mechanism to render said valve operating mechanism operative when engaged by said latching mechanism and inoperative when released by said latching mechanism, the improvement of sensor means mounted on said nozzle and disposed adjacent said filling tube, said sensor means communicating with said latch means to release said latch means with respect to said valve operating mechanism to render said valve operating mechanism inoperative when said filling tube is now disposed in a predetermined operative relationship within a fuel storage tank, said sensor means cooperating with said fuel storage tank when said filling tube is located in a predetermined operative relationship with respect to a fuel storage tank to permit said latch means to move to a position to engage said valve operating mechanism to render said valve operating mechanism operative to permit the flow of liquid through said liquid flow passage into said tank.

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London, Canada

Leonard W Swain