Raft inflation valve

Details Raft inflation valve Raft inflation valve

1983-08-22

1985-10-29

Blix, Trygve M.

Buoys, rafts, and aquatic devices

Rafts

Inflatable

441 99, 251 74, B63C 924

Patent

active

045498709

ABSTRACT:
A raft inflation valve includes a valve body having an inlet, an outlet, an internal cylinder open at one end to the valve outlet, an inlet passage leading from the valve inlet to and intersecting with the midsection of the internal cylinder and a firing pin passage which intersects the internal cylinder near its opposite end. A double-ended balanced piston with O-ring seals on both ends is positioned in the internal cylinder so that one end blocks the passage to the outlet. In this position (valve closed) the O-ring seals are on opposite sides of the intersection of the inlet passage which results in a balancing of the gas pressure forces acting on the piston. A compression spring located in the outlet end of the cylinder applies a bias force to the piston. In the valve closed position, movement of the piston away from the spring is physically blocked by a removable firing pin. The valve is actuated by pulling the firing pin out of the firing pin passage. This allows the spring to move the piston away from the outlet end of the internal cylinder so that the piston head partially uncovers the outlet passage. Once the outlet passage is partially uncovered, the gas pressure forces on the piston become unbalanced and the pressure rapidly accelerates the movement of the piston the remaining distance out of the passage, which then allows the inflation gas to flow freely through the valve to the raft.

REFERENCES:
patent: Re28355 (1975-03-01), Petri
patent: 2796177 (1957-06-01), Kryzer
patent: 3073301 (1963-01-01), Hay et al.
patent: 3204926 (1965-09-01), Wismar
patent: 3260554 (1966-07-01), Heiland
patent: 3570805 (1971-03-01), Moran et al.
patent: 3930517 (1976-01-01), Gagala
patent: 4269386 (1981-05-01), Crowe

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