. Railway mechanical engineer . n packing rings £ of L sectionare of cast iron, and have round their periphery a num-ber of 7/16 in. holes, the object of which is to allow com-munication between the steam ports and the valve body. Anumber of J4 in. holes are drilled in the inner sections Dof the valve, their position being clearly shown in the sectionaland end ^•iews. Sliding on a cast iron guide B threaded over the center glasses fitted with suitable controls, from which the oil isled to the valves, pistons and also the driving boxes. The continuous brake used on the Great Central is theautom
. Railway mechanical engineer . n packing rings £ of L sectionare of cast iron, and have round their periphery a num-ber of 7/16 in. holes, the object of which is to allow com-munication between the steam ports and the valve body. Anumber of J4 in. holes are drilled in the inner sections Dof the valve, their position being clearly shown in the sectionaland end ^•iews. Sliding on a cast iron guide B threaded over the center glasses fitted with suitable controls, from which the oil isled to the valves, pistons and also the driving boxes. The continuous brake used on the Great Central is theautomatic vacuum and the engines are fitted with a steambrake which may be worked separately or automaticallywith the train brake as desired. The boiler is fitted with a flue tube Robinson superheaterof 28 elements which are expanded directly into the cast ironheader of the front cover type. The boiler is a standardtype, and interchanges with two classes of 4-6-0 engines,having two inside cvlinders, and with the large four-cvlin-. Flg. t—Caledonian, Three-Cylinder, 4-6-0 Type Express Passenger Locomotive portion of the main valve body are two high carbon steelrings G which, when the throttle is open and steam pressurein the chests, are held to a seating over the Yz in. holes. If at any time the pressure in the cylinders should risehigher than that in the steam chest, due to excessive com-pression or any other cause, the rings are forced from theirseatings and the pressure relieved through the holes in theI>acking rings before mentioned, and via the ring valves intothe steam chest. Further, when the engine is running withsteam shut off the ring valves easily may leave their seatingsand the piston valve then will act as a cylinder by-pass valve,thus functioning as mentioned in paragraph (c). Stops areprovided on the valve guides by which fhe\ are limited toJ^ in. lift. Originally, the ring valves were held to their der express locomotives previously mentioned. The work-ing ste
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
