Automatic vacuum relief valve for hopper cars

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

1980-04-07

1981-07-14

Cline, William R.

Fluid handling

Line condition change responsive valves

Direct response valves

137588, 137350, F16K 1502, F16K 4500

Patent

active

042781078

ABSTRACT:
An automatic vacuum relief valve assembly includes a cover plate closing an opening in a container to the atmosphere. 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 passageways 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 outside atmosphere and the inside of the container.

REFERENCES:
patent: 1578766 (1926-03-01), Schwemlein
patent: 1897076 (1933-02-01), Shand
patent: 2169410 (1939-08-01), Drane
patent: 2732856 (1956-01-01), Jurs et al.
patent: 3260224 (1966-07-01), Pettit et al.

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