Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 387
and attachedto the top of each plunger chamber, a brasscheck valve and air cock with umbrella top,as shown in Fig. 17. This cock and valvemust have a clear passageway through them—the full equivalent of a |-inch bore. The check valve is to permit the outflow of air, butto prevent the influx when… … Steam Fire Pumps. 389 the water to the four-check valves. The hand wheel of thisvalve must be marked as per Fig. 15. The lettering must bevery clear, open, and distinct, not liable to be obscured by-grease, and of a permanent character. It is essential for a properly working pump that the main…
Hydraulic machinery · Pumping machinery
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