. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . orce theseparate exhaust valve to its normal position, closing thecommunication between the high pressure cylinder andthe exhaust (Plate 119). The pressure in the re-ceiver due to the exhaust from the high pressure cylinderwill force the intercepting valve to the left, which opensa passage for the exhaust steam through the receiver tothe low pressure steam-chest. A movement of the in-tercepting valve to the left prevents the passage of livesteam from the boiler
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . orce theseparate exhaust valve to its normal position, closing thecommunication between the high pressure cylinder andthe exhaust (Plate 119). The pressure in the re-ceiver due to the exhaust from the high pressure cylinderwill force the intercepting valve to the left, which opensa passage for the exhaust steam through the receiver tothe low pressure steam-chest. A movement of the in-tercepting valve to the left prevents the passage of livesteam from the boiler to the low pressure steam-chest. The intercepting and reducing valves of a two-cylin-der compound engine are automatically operated by thesteam pressure exerted upon them, this being due to thedifference in the areas of the ends of the valves. A compound engine should be operated as a simpleengine only when starting a heavy train or to preventthe engine from stalling on a grade, and this should bedone at a low speed, not to exceed four to six miles perhour. Lubrication. In lubricating a compound engine 262 COMPOUND COMPOUND LOCOMOTIVES. 263 two-thirds of the oil for cylinder lubrication should be fedto the high pressure cylinder while using steam. Whendrifting for a long distance this rule should be reversed,but the amount of oil used can be lessened by using alittle steam. The necessity, for feeding more oil to the high thanto the low pressure cylinder is due to the higher pressureof steam in the high pressure cylinder, which causes morefriction than exists in the low pressure, and the oil thatis fed to. the high pressure cylinder is carried along withthe steam to the low pressure, in a vaporized form. Height of Water. Just enough water should becarried in the boiler of a compound engine to preventoverheating of the fire-box under all conditions of service,as wet steam is more injurious to a compound than asimple engine. Starting. A compound engine when handling
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