GNU Webster's 1913
- n. a valve in the form of 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.
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