Raft inflation valve

Details Raft inflation valve Raft inflation valve

1983-04-13

1986-06-17

Blix, Trygve M.

Buoys, rafts, and aquatic devices

Rafts

441 41, 251294, 251324, 251900, B64D 1700

Patent

active

045953740

ABSTRACT:
A raft inflation valve, which is actuated by pulling a detachable cable connected to one end of a piston, thereby allowing inflation gas to flow from an attached pressure vessel into an inflatable raft includes a valve body having an inlet, an outlet, an internal cylinder open at one end to the valve outlet, and an inlet passage leading from the valve inlet to and intersecting with the midsection of the internal cylinder. A double-ended 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, thereby allowing the piston to be moved (for actuation) by simply overcoming the O-ring drag on the internal cylinder wall. This results in a low actuation force that is only remotely related to the operating pressure of the inflation system. The valve is actuated by moving 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: 3150388 (1964-09-01), Oliphant
patent: 3491783 (1970-01-01), Linsalato
patent: 3570805 (1971-03-01), Moran et al.
patent: 3768761 (1973-10-01), Cramer
patent: 3782413 (1974-01-01), Chacko
patent: 3853146 (1974-12-01), Blair
patent: 4269386 (1981-05-01), Crowe
patent: 4288005 (1981-09-01), Soo-Hoo

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