Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1980-10-14
1983-08-16
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
137350, 137526, 137588, F16K 17196
Patent
active
043985572
ABSTRACT:
A combination vacuum relief valve and pressure relief valve assembly includes a top cover plate which is movable vertically to vent a predetermined pressure in the tank above atmospheric. The top cover plate is resiliently mounted with springs which resiliently bias the cover into the closed position to determine the pressure at which the top cover plate moves to vent pressure in the tank. The vacuum relief valve is located below the top cover plate. First passageways provide fluid communication between the outside atmosphere and the lower surface of the vacuum relief valve. Second passageways provide fluid communication between the top surface of the vacuum relief valve, the bottom surface of the top cover plate and the interior of the tank. When the pressure in the tank is below atmospheric, atmospheric pressure acting on the lower surface of the vacuum relief valve lifts the vacuum relief valve to allow air to enter the tank through the first and second passageways until the pressure in the tank reaches atmospheric. When the pressure in the tank exceeds atmospheric, the top cover plate is lifted by this excess above atmospheric to vent pressure in the tank until near atmospheric pressure is reached, when the top cover plate returns to its original position.
REFERENCES:
patent: 1578766 (1926-03-01), Schwemlein
patent: 1923503 (1933-08-01), Raines
patent: 1973258 (1934-09-01), Jensen
patent: 2169410 (1939-08-01), Drane
patent: 2183448 (1939-12-01), Drane
patent: 2452612 (1948-11-01), Swenberg
patent: 4278107 (1981-07-01), Dugge et al.
ACF Industries Incorporated
Cummings Henry W.
Nilson Robert G.
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