. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . IN LOCOMOTIVE C.\li. loosen things at the front end. Thisnecessitates the taking out of superheaterunits in order to regrind. The fact thatinternal inspection is possible in this man roads as a good device for overcomingthis serious and expensive dilrtculty. Thevalve has a small valve in the top of themain valve, which opens first one-quarter 216 RAILWAY AND LOCOMOTIVE ENGINEERING July, 1917. indi. and closes last. There is a notchon the top side of the quadrant and adog on the lev
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . IN LOCOMOTIVE C.\li. loosen things at the front end. Thisnecessitates the taking out of superheaterunits in order to regrind. The fact thatinternal inspection is possible in this man roads as a good device for overcomingthis serious and expensive dilrtculty. Thevalve has a small valve in the top of themain valve, which opens first one-quarter 216 RAILWAY AND LOCOMOTIVE ENGINEERING July, 1917. indi. and closes last. There is a notchon the top side of the quadrant and adog on the lever engages with it when thevalve is being closed at a point which in-sures the main valve being closed and the drifting valve. The steam enters the bal-ancing chamber and fully balances themain valve. The shoulder on the valvestem engages the boss on the under sideof tlie balancing piston, which, in turn. B WBBaRf .-j-qi [jj^yyyyuuduu^LuJuSftj £. THROTTLE ROD ARR.\— VALVE. small drifting valve open. This providesenough steam on a large superheatedengine to drift at the rate of forty to fiftymiles per hour and maintains sufficientsteam in the cylinders to exclude the air,which, if allowed to enter the cylinder,would cause trouble. The important fea-ture in drifting is never to completely stopthe flow of steam to the cylinders. It isthe lirst few revolutions after shutting offthat do the damage. It has been provedthat three or four revolutions are suffi-cient to form a vacuum and so cause airto enter. Enginemen who have becomeaccustomed to handling this valve saythat they operate it automatically andalmost without thought. The Chambers throttle valve is whollybalanced with steam through the smallbalancing drifting valve in the lop of themain valve which opens first. Steamenters into what is known as the balancechamber exerting an upward pressure intlie balancing piston. This steam does thework of levers, bell-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
