. Handbook of construction plant, its cost and efficiency. f the Marsh SteamPump, and shows the steam valve in position, the steam and Fig. 241. The Improved Marsh Steam Pump. water pistons, manner of packing, etc. The steam valve is madeof brass, and though nicely fitted, moves freely in the central PUMPS 523 bore of the steam chest. It has no mechanical connections withother moving parts of the pump, but is actuated to admit, cutoff and release the steam by live steam currents, which alternatewith the reciprocations of the piston. Each end of the valve ismade to fit the enlarged bore of the
. Handbook of construction plant, its cost and efficiency. f the Marsh SteamPump, and shows the steam valve in position, the steam and Fig. 241. The Improved Marsh Steam Pump. water pistons, manner of packing, etc. The steam valve is madeof brass, and though nicely fitted, moves freely in the central PUMPS 523 bore of the steam chest. It has no mechanical connections withother moving parts of the pump, but is actuated to admit, cutoff and release the steam by live steam currents, which alternatewith the reciprocations of the piston. Each end of the valve ismade to fit the enlarged bore of the steam chest, and it is dueto those enlarged valve heads, which present differential areas tothe action of steam, and the perfect freedom of the valve tomove without hindrance from other mechanical arrangements orparts, that the flow of steam into the pump is automaticallyregulated. Because the pump is so regulated it can neverrun too fast to take suction; or, should the water supply give outwhen the throttle valve is wide open, no injury can occur to the. Fig. 242. Standard Side Suction Volute Pump. moving parts. The steam valve does not require setting. Thesteam piston, as shown, is double, and each head is provided witha metal packing ring, the interior space constituting a reservoirfor live steam pressure, supplied by the live steam pipe througha drilled hole shown by dotted lines. At each end of the steamcylinder are similar holes leading to each end of the steam chest,which, together with the centrally drilled hole and the space be-tween the piston heads, constitute positive means for tripping orreversing the valve with live steam. Size. Inches Gallons Horse- Floor Weight. per Hour. power. Space. Lbs. Price. 200 36 7x12 40 $ 400 60 8x16 75 500 75 10x22 145 524 HANDBOOK OF CONSTRUCTION PLANT RAILS AND TRACKS The price of rails at Pittsburg and other centers varies from$27 to $35 per ton. f The following prices were current in the summer of 1910 onlots of 50
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
