Fluent material handling – with receiver or receiver coacting mea – Automatic control of flow cutoff or diversion – Level or overflow responsive
Patent
1976-02-24
1977-08-09
Bell, Jr., Houston S.
Fluent material handling, with receiver or receiver coacting mea
Automatic control of flow cutoff or diversion
Level or overflow responsive
141346, B67D 500
Patent
active
040404552
ABSTRACT:
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.
REFERENCES:
patent: 1725826 (1929-08-01), Payne
patent: 3005476 (1961-10-01), Klaus
patent: 3102555 (1963-09-01), Botkin
Bower Allen M.
Swain Leonard W.
Bell, Jr. Houston S.
EMCO Limited
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