MARINE ENGINES.
44I
condenser, even although half-grated holes are cut in the pattern;they are bolted down with stud bolts and nuts, and collar bolts atthe hinge for taking the flat guard, these bolts being screwed intoholes bored and tapped in cross webs cast in the condenser forsupporting the grated plate, because with the peculiar form ofhexagonal holes it is not convenient to introduce strengtheningribs in the grating.
Discharge Valve .—We will now consider the arrangements
cast-iron Valve Chest for Discharge Pipes fromHot Well.— a, Valve . b, Chest. c, Lifting eyeand spindle. d, Cover, e, Hole for cotter.f, Hole for donkey feed-valve box. g, Branchat side of ship.
Charge Pipe from Hot Well, fitted with Expan-sion Joint.— a, Valve . b, Chest. c, Stuffingbox and gland. D, Lifting spindle. E, Cover.f, Cotter. g, Hole for donkey feed-valve box.h, Branch at side of ship.
required outside of the condenser. The discharge pipe from thehot well should be fitted with an expansion joint, placed on thevalve chest at the ship’s side; this valve is introduced so that thesea water can be shut off when the Attings inside of the condenserand air pump require inspection. The valve in most cases is aspindle one, with a long rod secured to the top, passing through a.stuffing box on the valve-chest cover, and having a ring handlefitted at the top, for attaching a block and tackle for lifting it; andas the valve box is generally placed inside of the coal boxes, means