NASA NTRS · 19820000183
Tapped-Hole Vent Path
Abstract
Long helical vent path cools and releases hot pyrotechnical gas that exits along its spiraling threads. Current design uses 1/4-28 threads with outer diameter of stud reduced by 0.025 in. (0.62 mm). To open or close gassampler bottle, pyrotechnic charges on either one side or other of valve cylinder are actuated. Gases vented slowly over long path are cool enough to present no ignition hazard. Vent used to meter flow in refrigeration, pneumaticcontrol, and fluid-control systems by appropriately adjusting size and length of vent path.
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Chandler, J. A.. 1983-03-01. Tapped-Hole Vent Path. https://ntrs.nasa.gov/citations/19820000183
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