NASA NTRS · 19660000493
Spool valve cycles at controlled frequency
Abstract
Spool valve accurately controls the cycle of a pneumatically-actuated system over long periods. Regulation of pressure from the external source, positioning of the adjusting plugs, and magnet selection, together afford wide variation in cyclic timing and speed of closure in either direction.
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Charlton, K. W., Van Arnam, D. E.. 1966-11-01. Spool valve cycles at controlled frequency. https://ntrs.nasa.gov/citations/19660000493
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