Vent valve with back pressure check

Details Vent valve with back pressure check Vent valve with back pressure check

1975-11-10

1977-05-17

Nilson, Robert G.

Fluid handling

Control by change of position or inertia of system

With second control

137 43, 1374933, 1374936, 220202, 220203, F16K 1736

Patent

active

040235831

ABSTRACT:
A valve apparatus for limiting the pressure of gases in an enclosed tank. The valve has a body mounted on the tank wall structure providing a passage into the tank chamber. A breather intake valve surrounds the body and allows air to flow into the tank chamber when sub-atmospheric pressure is present in the tank chamber. A valve assembly located in the passage operates to allow excessive gas pressure to escape from the tank chamber. The valve assembly has a first valve that closes, should the tank partially or totally overturn, to prevent liquid from flowing out of the tank and a second valve that is normally biased closed to prevent the escape of gases and vapor from the tank chamber to the atmosphere.

REFERENCES:
patent: 3280838 (1966-10-01), Parkinson
patent: 3568695 (1971-03-01), DeFrees
patent: 3938692 (1976-02-01), Crute

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