Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 397
Fig. 874. Fig. 875. the two side valves or disks are forced against their respective faces by the conesuspended between the disks, forced upward by its stem coming in contact withthe bottom of the case; as the gate is raised, the cone drops, the pressure is re-leased, and the valve easily drawn up…
Mechanical drawing
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