Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 397
ade of large area, and still be under the control of ahand wheel. GATE-VALVES. When the pressure is always on one side of the valve, it may be made as aplain gate, sliding in grooves, and raised up into a chamber; but it is the usualpractice to make these gates double, each being forced positively…
Mechanical drawing
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