Puppet valve

a valve in the form of a circular disk, which covers a hole in its seat, and opens by moving bodily away from the seat while remaining parallel with it, - used in steam engines, pumps, safety valves, etc. Its edge is often beveled, and fits in a conical recess in the seat when the valve is closed. See the valves shown in Illusts. of Plunger pump, and Safety valve, under Plunger, and Safety.

See also: Puppet

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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