Double foot valve for cryogenic fluid containing tanks

Details Double foot valve for cryogenic fluid containing tanks Double foot valve for cryogenic fluid containing tanks

1975-05-21

1976-06-15

Raduazo, Henry F.

Pumps

Motor driven

Including means for facilitating assembly or disassembly of...

415201, 222333, 415157, F04B 3504

Patent

active

039633810

ABSTRACT:
This invention relates to an improvement in an apparatus suited for removing liquid e.g., flammable from a bulk container comprising pumping equipment in the container, a fluid transmitting casing extending from an upper portion in the container to a lower portion and communicating with the pumping equipment, an inlet communicating with the pumping equipment, a fluid outlet at the upper part of the container communicating with the casing, a foot valve for sealing the inlet from the container when in a closed position and permitting fluid flow from the container through the inlet to said casing when in the open position, said foot valve including means responsive to lifting movement of the pumping equipment for closing said valve and a sealing gland at the top of the casing accommodating movement of the pumping equipment for permitting opening and closing of the foot valve without venting the casing. The improvement comprises a "double foot valve" comprising an inner poppet carrying a sealing surface and extending across said inlet for sealing engagement when in a closed position, and an outer poppet carrying a sealing surface and extending across the inlet for sealing engagement when in a closed position, the outer poppet carrying the inner poppet for independent axial movement.

REFERENCES:
patent: 2384254 (1945-09-01), Meredew
patent: 2912003 (1959-11-01), Lagerwey
patent: 2978150 (1961-04-01), Doelcher
patent: 3000543 (1961-09-01), Paul
patent: 3369715 (1968-02-01), Carter
patent: 3453964 (1969-07-01), Hallworth
patent: 3625639 (1971-12-01), Eggmann
patent: 3876120 (1975-04-01), Haesloop

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