Abstract: An inflatable aircraft evacuation slide system includes a primary valve, a bust disk and a valve leakage trap operatively disposed between the primary valve and the burst disk. The valve leakage trap comprises a small exhaust vent opening into a flow restriction orifice in the gas path between the primary valve and the burst disk. In operation, when the aircraft emergency exit is opened in the armed condition, the primary valve opens and pressurizes the chamber until the burst disk ruptures allowing inflation gases to pass through the flow restriction orifice to inflate the inflatable evacuation slide. Because there is a substantial pressure drop across the flow restriction orifice, the presence of the valve leakage safety vent in the orifice does not result in significant loss of inflation gas needed for inflating the inflatable evacuation slide. In the event of leakage past the primary valve, however, the valve leakage trap safely vents the leakage pressure to the atmosphere.

Abstract: A valve for use in an inflation system wherein the valve has a spring regulated piston which regulates the flow rate through the valve into the inflatable member, such that if the flow rate gets too high, the regulating piston will divert some or all of the flow out a neutral thrust over pressure relief vent, which vents outside the inflatable member. The valve also has a secondary form of overpressure relief in the form of a neutral thrust diffuser which also dumps outside of the inflatable member. Fluid is prevented from flowing out of the neutral thrust diffuser by a burst disk, but if the fluid pressure is high enough, the burst disk will burst, and the fluid will flow out of the neutral thrust diffuser.