Automatic vacuum relief valve for hopper cars

Details Automatic vacuum relief valve for hopper cars Automatic vacuum relief valve for hopper cars

B - Operations, Transporting

61

D

105/184, 137/64

B61D 7/00 (2006.01)

Patent

CA 1125577

AUTOMATIC VACUUM RELIEF VALVE FOR HOPPER CARS Abstract of the Disclosure An automatic vacuum relief valve assembly includes a cover plate closing an opening in a container to the atmos- phere. A valve is vertically spaced below the cover plate and closes communication between the inside of the container and the outside atmosphere. A first passageway provides fluid communication between a first surface of the valve and the outside atmosphere. A second passageway provides fluid communication between the inside of the container and a second surface of the valve. When the pressure inside the container becomes less than atmospheric pressure, atmospheric pressure will cause the valve to move away from its seat and allow air to enter the container. When the pressure is equalized, the valve is biased to return to the seated position. The cross sectional area of the first passageways and the cross sectional area of the second passage- ways are at least equal to the cross sectional area of the valve to maximize the volume of air flow for a given cross sectional area of valve and pressure drop between the out- side atmosphere and the inside of the container.

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