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Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice (1922)

Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 269

An illustration from Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice, 1922, leaf 269 — e pump ison its forward stroke when the other is on its return. The valves have neither laps nor lead, sothat cut-off occurs simultane-ously with release. The valvestem of each pump is drivenby a rocker deriving its motionfrom the piston rod of the otherpump (see Fig. 98). As eachFig. 98.—Duplex… … 49 STEAM PUMP TESTING 251 stem and the valve. This is shown by the distance c in thefigure. The valve stem passes freely through a hole in a lug onthe valve, and gives motion to the valve only when the nuts nand n come into contact with the lug. By adjusting the lostmotion, the valve may have more…

Mechanical engineering

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