NASA NTRS · 19840000140
Conserving Purge Gases
Abstract
Two-step flow control adjusts to dimensional changes in purged equipment. Two pressure actuated valves provide two-step control. When turbopump starts, helium flows through both valves. As pump operates its parts expand, clearance decrease and back pressure builds up on valves. At preset back pressure value, one valve closes, reducing helium flow.
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Kan, K., Blewett, L., Nelson, T.. 1985-01-01. Conserving Purge Gases. https://ntrs.nasa.gov/citations/19840000140
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