Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 168
596. MULTIPLE RING VALVE, for ^ enlarged valve area with small lift. … 597. DOUBLE-BEAT PUMP VALVE, Cor- I nish model. The upper seat is supported by a I cross-bar, in which is fixed the guide-pin that^ carries the valve.
Mechanical movements
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