. Railway mechanical engineer . inders arefitted with the Robinson pressure release valve, the two valvesat each end of the cylinder being combined in a single casting; thai is to say, there are two such castings, each containing two valves which communicate by means of a perforated connecting pipe. These pressure release valves combine thefunctions Of air valves, water relief valves and compression release valves when running without steam. The valve spindle packing, which is exposed to the super-heated steam, is composed of a special bronze instead of theusual lead and antimony white metal.
. Railway mechanical engineer . inders arefitted with the Robinson pressure release valve, the two valvesat each end of the cylinder being combined in a single casting; thai is to say, there are two such castings, each containing two valves which communicate by means of a perforated connecting pipe. These pressure release valves combine thefunctions Of air valves, water relief valves and compression release valves when running without steam. The valve spindle packing, which is exposed to the super-heated steam, is composed of a special bronze instead of theusual lead and antimony white metal. The piston rod pack-ing which, owing to the expansion of the steam in the cylin-der, is always at a much lower temperature, is of the usualh .id antimony mixture. The packings are of the standardtype as used on non-superheater locomotives, as it is foundthat no need exists for special (lacking even when using super-heated steam of over 700 deg. 1. in the steam chest. It isfound, however, that when the steam chests are above the. Cross Sections of the Great Central Locomotive cylinders white metal gives trouble for the valve spindles,but not when the}- are below, because the steam is cooled inpassing over the cylinder barrels on its way to the steamchest. The front ends of the valve spindles are carried by-brackets cast on the front steam chest covers, a renewablecast-iron sleeve being fitted on the end of the spindle to takethe wear. The back end of the spindle is supported by aspecial three-bearing bayonet joint which transfers the valvedrive from the center line of the valve rod to that of thespindle. The engines are fitted with the Stephenson type ofvalve motion. The engine truck has a cross travel of b]/> in. which iscontrolled by a strong elliptic spring. It is otherwise of theordinary construction with cross slides and the usual springarrangement. The boiler, which has a diameter at the front end of 5 in. outside and 5 ft. 3 in. diam. outside at the firebox end,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
