NASA NTRS · 19660000368
Automatic protective vent has fail-safe feature
Abstract
Delayed vent valve system in a mechanical backing pump in a vacuum system allows the pneumatic foreline valve to seal before the pump vent opens. The system is designed to be fail-safe and operate even though there is loss of electrical power.
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Dameron, C. E.. 1966-08-01. Automatic protective vent has fail-safe feature. https://ntrs.nasa.gov/citations/19660000368
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