NASA NTRS · 19780000560
Adjustable gas-flow restrictor
Abstract
Flow restrictor uses long narrow helical path between mating threads to effect simultaneous pressure and temperature reduction of flowing gases within short axial distance. Pressure drop can be adjusted simply by screwing or unscrewing threaded parts to increase or decrease flow path.
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Brown, J. J., Carnevalle, A.. 1979-03-01. Adjustable gas-flow restrictor. https://ntrs.nasa.gov/citations/19780000560
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