. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . PLATE 57. This valve has a supplementary port AA supplyingsteam to one steam port from both sides of the valve atthe same time, thus giving double port opening forthe same travel of the valve, and an increase of steampressure in the cylinder. This valve has given excellent i8o VALVE MOTION. results, as it admits a good supply of steam at a highinitial cylinder pressure with short valve travel, and it isespecially adapted to high speed engines working inshort cu
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . PLATE 57. This valve has a supplementary port AA supplyingsteam to one steam port from both sides of the valve atthe same time, thus giving double port opening forthe same travel of the valve, and an increase of steampressure in the cylinder. This valve has given excellent i8o VALVE MOTION. results, as it admits a good supply of steam at a highinitial cylinder pressure with short valve travel, and it isespecially adapted to high speed engines working inshort cut-offs. This valve is of the D type. PISTON VALVE. The piston valve derives its name from its con-struction. It consists of two pistons PP, connected bya stem which is usually hollow (Plate 58). The pis-tons have two or more packing rings which formthe exhaust and steam edges of the valve. Packing ringsI and 2 form the steam edges and rings 3 and 4 the ex-haust PLATE 58. Plate 59 shows the piston valve in the bushing, Plate 60 shows a section through the saddle and cyl-inder. V represents the piston valve, C the cylinder, Ethe exhaust and S the steam passage. Plate 61 shows the piston valve bushing. The longi-tudinal strips or bridges are added to strengthen thebushing and to prevent the packing rings on the valvefrom springing past the edge of the port, while travelingover them. VALVE MOTION. (8i
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