Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 226
as a slot, shown by the dotted line in itto receive the edge of a screw-driver, held in a bit stock togrind the valve seat in refitting. The lift of the valve is reg-ulated by the distance between the top of the stem and thebottom of the covering nut or cap. In hydraulic pumps it is found to be…
Hydraulic machinery · Pumping machinery
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