Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 168
595. MULTIPLE BALL VALVE.—The cone-valve seat is in two parts ; the cover or cage is heldin place by the screw in the cap. … 596. MULTIPLE RING VALVE, for ^ enlarged valve area with small lift.
Mechanical movements
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