Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator (1914) (14797389353)
Zusammenfassung
Identifier: machinedrawingpr01grif (find matches)
Title: Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator
Year: 1914 (1910s)
Authors: Griffin, Charles Lewis, 1867- Adams, Charles Clyde, 1882- joint author
Subjects: Machinery
Publisher: Chicago, American technical society
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
Text Appearing Before Image:
ced that the nuts on the valve stem inside the chest, which abutagainst the faces of the lug on the valve, do not rest against thefaces of the lug in the position shown, but have considerable lostmotion. This lost motion is one of the essential features of thevalve motion of a duplex pump, and permits the valve to remainat rest for a short period at the end of the stroke, though the valvestem may have reversed its motion and begun its return stroke.When this lost motion is taken up by the movement of the stemand the nuts abut against the lug on the valve, the valve will move,and from this point to the end of the stroke be positively controlledby the motion of the stem. At the end of the stroke the stem willreverse, when the lost motion will again permit the valve to rest forthe same period as at the other end, and then move on as before.The time of rest of the valve, and consequently the pistons andplungers, is approximately one-third the period of the stroke. This 190 MACHINE DRAWING
Text Appearing After Image:
MACHINE DRAWING 191