Definitions
from The Century Dictionary.
- noun In steamengines, a valve which covers the top of the barrel of the air-pump and opens upward. It prevents the water which is forced through it on the ascent of the piston from returning.
Etymologies
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Examples
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At the end of from six to ten minutes the pressure-valve is closed and the discharge-valve opened.
Scientific American Supplement, No. 358, November 11, 1882 Various
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