Anti-siphoning liquid valve filter

Details Anti-siphoning liquid valve filter Anti-siphoning liquid valve filter

1987-06-16

1988-12-27

Cohan, Alan

Surgery

Means for passing respiratory gas through body of liquid...

55355, 261 22, A62B 2300

Patent

active

047933380

ABSTRACT:
A method and apparatus for filtering a gas through a liquid which prevents siphoning of the liquid out of the filter apparatus including at least first and second vessels partially filled with liquid, the first vessel having gas inlet and outlet ports that do not contact the liquid, thereby enabling the gas to bypass the liquid of the first vessel in a normal filtering direction and prevent siphoning of the liquid therefrom, and a device to direct gas received from the second vessel into the liquid of the first vessel during a reverse gas flow such that the liquid in the first vessel acts as a valve. The second vessel includes gas inlet and outlet ports that do not contact the liquid, thereby enabling the gas to bypass the liquid of the second vessel in a reverse gas flow direction and prevent siphoning of the liquid therefrom, and a device to direct gas bypassed through the first vessel through the liquid such that liquid filters the gas which then exits the second vessel through a gas port. Normally, gas is bypassed through the first vessel and filtered through the liquid of the second vessel to pass through an outlet gas port of the second vessel. Gas is then permitted to bypass through the second vessel in a reverse gas flow direction and through the liquid valve of the first vessel to be discharged through a gas port. Gas flowing in either direction cannot cause the liquids in either vessel to be lost due to siphoning. The functions of the first and second vessels are reversible.

REFERENCES:
patent: 968926 (1910-08-01), Fischer
patent: 988398 (1911-04-01), Stein
patent: 2251795 (1941-08-01), Howard
patent: 3378241 (1968-04-01), Stokes
patent: 3504481 (1970-04-01), Zakarian
patent: 3522018 (1970-07-01), Bachmann et al.
patent: 3525309 (1970-08-01), Katz
patent: 3945918 (1976-03-01), Kirk
patent: 3998613 (1976-12-01), Attig
patent: 4140735 (1979-02-01), Schumacher
patent: 4476092 (1984-10-01), Nakamura et al.
patent: 4566450 (1986-01-01), Brossman

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