Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 398
revent excessive pres-sures, either of steam or water, asafety-valve is used (Fig. 880),which consists of a poppet-valveheld down by a lever and weight.To determine the weight coun-terbalancing the pressure, putthe valve and lever in position,attach the valve to the stem, andwith a spring balance…
Mechanical drawing
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