Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 296
alve, a pre-liminary valve and a yoke connected directly to the valve stem,as shown in Fig. 262. The valve piston is contamed m acylinder above the steam chest, and moves the main valve bymeans of a pin, which projects into a pocket in the top. The main valve and preliminary valve travel on the… … The preliminary valve is the ordinary D type and controlsthree ports, as shown in Fig. 263, the two steam ports are con-nected with either end of the auxiliary cylinder and the ex-haust, with the small port. A, in the main valve seat. The dutyof the preliminary valve is to alternately connect each…
Hydraulic machinery · Pumping machinery
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