447 MARINE ENGINES . placed at the end of the pump ; the feed or delivery and the relief valves are placed on the same level , while the suction valve is immediately under the relief valve , which … when not required in the boiler is returned Fig . 334 . — Valve Box for Feed Pump . and finds its way overboard . A plug valve a , Valve box . b , Suction valve . C , Delivery valve . d , Relief valve . for shutting off the suction is also fitted to E , Spring , f , Bow . G , Set screw . the valve…
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