. American engineer and railroad journal . more direct than this unless the valve stem and linkblock could be placed on a level which would avoid the neces- sity for the parallel motion. Such a location, however, wouldnot give a favorable arrangement of the steam passages inthe saddle casting, even if it could be accomplished. Piston valves need special protection from water of con-densation, from the resistance of the pistons and from thecutting action caused by drawing cinders and dirt from thesmokebox while drifting, and for these purposes a novel reliefvalve has been used, designed, and, w
. American engineer and railroad journal . more direct than this unless the valve stem and linkblock could be placed on a level which would avoid the neces- sity for the parallel motion. Such a location, however, wouldnot give a favorable arrangement of the steam passages inthe saddle casting, even if it could be accomplished. Piston valves need special protection from water of con-densation, from the resistance of the pistons and from thecutting action caused by drawing cinders and dirt from thesmokebox while drifting, and for these purposes a novel reliefvalve has been used, designed, and, we believe, patented byMr. G. R. Henderson, formerly Mechanical Engineer of thisroad, and now Assistant Superintendent of Motive Power of theChicago & Northwestern. This valve is shown in the cylinderdrawing. It opens a passage connecting the steam port fromthe cylinder with the steam passage in the saddle so that whendrifting with steam shut off a by-pass from one end of thecylinder to the other is provided to prevent sucking air into. Showing End of Valve Casing Between the Frames,the cylinder through the exhaust pipe. Unlike the usual reliefvalve, this opens by gravity and does not require a vacuum tobe formed in order to bring it into action. Upon opening thethrottle the steam pressure under the valve closes it against itsseat and it remains closed unless by reason of the presenceof water in the cylinder the pressure above the valve exceedsthat of the steam pressure from the boiler. In that case thevalve relieves the cylinder. Another advantage of this valvelies in the fact that it opens when the engine stops, and thereis no danger of the engine being moved unintentionally in
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
