. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e tests, printed onpages 31 and 32, are as follows: To establish a relation between thevalve and cylinder so that the valve maybe standardized, it may be stated gen-erally that the diameter of the valve ininches for superheated steam should notbe less than where D ;= the a railroad to carry in stock as few diam-eters of piston valves as possible. Theseconsiderations doubtless led the Pennsyl-vania Railroad to adopt the 8 and 12-inch valves as standard to be used in newconstruction and
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e tests, printed onpages 31 and 32, are as follows: To establish a relation between thevalve and cylinder so that the valve maybe standardized, it may be stated gen-erally that the diameter of the valve ininches for superheated steam should notbe less than where D ;= the a railroad to carry in stock as few diam-eters of piston valves as possible. Theseconsiderations doubtless led the Pennsyl-vania Railroad to adopt the 8 and 12-inch valves as standard to be used in newconstruction and reconstruction whereverpossible. These sizes adopted by the Pennsyl-vania Railroad are so much smaller thanrequired by current locomotive practicein the Inited States that some cautionshould he observed in adopting themwithout due consideration. For instance,the statement in the last paragraph ofthe conclusion, namely, calling attentionto the necessity of an increase in per-centage of cut-off with the smaller valvediameter in order to obtain the same PntPARATION OF CTLlNDERSrOR OUTSIDE STEAM PIPES. MALr LONmTUDINAL SCCTlONAf^D itO*. tlXvMTIONSHOWINq (APPLICATION OPTOKCANS BUBMtNQ. . - CririOcR AT A-B nC^ MOLE C^/T IN STCAf-l CHEST TO RCCEIVX. TOWC APPLYING OUTSIDE PIPES TO PISTON VALVE CYLINDERS ON THE SOUTHERN PACIFIC. Cylinder Diameter. Valve ( A Diam- Satu- Super- eter. rated Steam. heated Steam. 10 in. 17 in. to 18 in. 18 in. to 19 in. 11 in. 18J4 in. to 20 in. 19^ in. to 21 in. 12 in. 20J4 in. to 22 in. 21>/lin. to23in. 14 in. 22K in. to 24 in. liVi in. to 27 in. 16 in. 245^^ in. upward 27^ in. upward Extensive tests were made by the Penn-sylvania Railroad on the locomotive test-ing plant at Altoona to determine thelimitations in the use of piston valvesvarying from 7 to 16 inches in diameter,on locomotives having 22, 24 and 25inches diameter of cylinders. In allcases these tests were made with loco- diameter of cylinder in inches. The 12-inch valve is now used f
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