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According to the update , erosion created a hole in the slide valve, allowing air to mix with hydrocarbons.

FCCUs use a fine, silica catalyst in high heat to make gasoline from gas oil and the passage of the sand-like catalyst over the slide valve at the Superior refinery wore a hole in it.

Helicopters Inc. has since changed its story, now blaming the crash on a jammed slide valve, a component in the hydraulic system controlling the chopper’s tail rotor.

The valves of the high-pressure and intermediate cylinders were of the piston type, and the low-pressure cylinder had double-ported slide valves, fitted with Stephenson link motion.

The construction of a common slide valve is shown in Fig.