Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 211
can be done withordinary valves also, provided the springhas not injured the upper surface of thedisc. Valve seats are generally pressed into the plates, althoughinstances may be found where they are screwed. When pressedin they may be withdrawn by substituting a bolt havinglonger screw threads… … Fig. 185.
Hydraulic machinery · Pumping machinery
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