Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 342
valve firmly to its seat, thespring being held in position by the head of the bolt, or cap, as shown. Certain improvements in pump valves have been made which tendto increase the durability and to prevent the liability of sticking, whichis not an uncommon occurrence after the valves have become… … WfiMt—r^Lflitr*—Willlip kggj] \» FlGS. 4,286 to 4,289.—Various details of pump valve construction. can be done with ordinary valves also, provided the spring has notinjured the upper surface of the disc. Valve seats are generally pressed into the plates, although instancesmay be found where they…
Electrical engineering
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