MODERN STEAM PRACTICE . 470 the following rule , would be of itself sufficient to relieve the boilers : — A = ^ + area of guides of valve , ^ HS Or A = - + area of guides of valves . This valve should be loaded , say I lb . per square inch , less than the easing valve . … square inch in excess of Figs . 342A , 342B . — a , Safety valve . b , Spring , cc , Studs the working valve . with screwed ends . d , Cap . e e , Chest leading to waste pipe and nozzle at the side of ship . f , Hand lever for lift - 8th . If the heating sur - ing valve . face exceeds 30 feet per…
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