Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 309
B Fig. 276. alternately backward and forward by the pressure of steam,carrying with it the main valve, which admits steam to themain steam piston that operates the pump. The main valve isa plain slide whose section is of g form, working on a flat seat. … Fig. 277 The valve piston is slightly rotated back and forth by therocker bar, H ; this rotative movement places the small steamports, D E F, Fig. 276, which are located in the under side ofthe valve piston in proper position with reference to the cor-responding ports, A B, cut in the steam chest.…
Hydraulic machinery · Pumping machinery
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