. Science of railways . AETS The general arrangement of valves, valve chambers, steam chestoovers, etc., is shown in Figs. 1 and 2. The steam chest or main valve chamber is on an angle of 15degrees with the horizontal and placed close to the cylinder ports are short and practically straight, so that their surfacesmay be scraped clean and smooth. The compression controllingvalve chamber passes through the longest section of the ports,and is bushed in the usual way to provide for repairs. The steamchest cover forms the top side of the main valve chamber andprovides a by-pass connection
. Science of railways . AETS The general arrangement of valves, valve chambers, steam chestoovers, etc., is shown in Figs. 1 and 2. The steam chest or main valve chamber is on an angle of 15degrees with the horizontal and placed close to the cylinder ports are short and practically straight, so that their surfacesmay be scraped clean and smooth. The compression controllingvalve chamber passes through the longest section of the ports,and is bushed in the usual way to provide for repairs. The steamchest cover forms the top side of the main valve chamber andprovides a by-pass connection between the exhaust passages whichequalizes exhaust pressures. i LOCOMOTIVE APPLIANCES. 151 The main steam valve is of rectilinear form, rigidly constructedand designed so that the wear is uniform, regardless of the is balanced for all speeds and under all pressures, running or■drifting, and with its wearing surfaces nearly doubled by specialriding shoes, the wear oft the valve and valve seat is very This illustration shows the Cylinder with Steam Chest Coverand Valves removed. As will be seen, the Cylinder and ValveChamber or Steam Chest are one easting; the ports are short andpractically straight with the Compression Valves passing throughtheir longest section. The admission is from the inside whichbrings the live steam in contact with a considei^able portion of theCylinder walls, while the exhaust is at the ends and is mosteffectually insulated from the live steam, thus eliminating one ofthe greatest sources of lieat loss. Double walls are used aroundall live steam passages wherever practicable with the object ofmaking the insulation as perfect as possible. This design producesan exceptionally strong cylinder well adapted to resisting shockswhich would often destroy cylinders of the ordinary design. 152 LOCOMOTIVE APPLIANCES. The compression controlling valve is a piston valve of the usualdesign, except that it is very light and provided with wide snapri
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