. Railway mechanical engineer . w Vuih. 1 in iiosition by a glandklin Railway Supply LOCOMOTIVE SAFETY VALVE The accompanying illustration shows a new type of safetyvalve recently placed on tlie market by the Crane Company,Chicago. These valves are different from those heretoforemade by this company, in that they have a greater lift and thecasing is made of malleable iron. The main spring is also madeof larger wire and the coil is of larger diameter. The lift hasbeen increased on the open pop valve to in., and on themuffler to in., an increase of from .07 to .05 in. Excessivehammerin
. Railway mechanical engineer . w Vuih. 1 in iiosition by a glandklin Railway Supply LOCOMOTIVE SAFETY VALVE The accompanying illustration shows a new type of safetyvalve recently placed on tlie market by the Crane Company,Chicago. These valves are different from those heretoforemade by this company, in that they have a greater lift and thecasing is made of malleable iron. The main spring is also madeof larger wire and the coil is of larger diameter. The lift hasbeen increased on the open pop valve to in., and on themuffler to in., an increase of from .07 to .05 in. Excessivehammering of the valve as it closes from this relatively high liftis eliminated by the use of an auxiliary valve, also controlledby a spring, which covers a series of holes in the main valve,as shown in the drawing. As the main valve is lifted from itslower seat by the steam pressure, full opening is provided toit and the valve is lifted to its open position. As the pressuredrops and tlie main \alve low-ers, steam will be caught in the. Improved Crane Safety Valve cavities under the auxiliary val\ e. thus cushioning the mainvalve and preventing the severe shock that has many timesbeen found very objectionable on high lift valves. The muffled valve is similar in construction to the open valve. Type Size Open 2/. in. Open 3 in. Open 2/, in. Open 3 in. Muffler IAm. Muffler 3 in. Muffler 2,-; in. Muffler 3 in. lib. 180 II).JOii II).200 lb. Discharge ofsteam per hour7,500 ,200 ,300 ,500 ,400 lb. and instead of using two muffler plates, as was done in the oldtype, only one is used, it being made a part of the casing. Bymeans of these high lift valves it has been found possible to usesmaller valves as the capacity has been so materially acconiiianying table shows the discharge of steam per hourwith 2/i anil .3 in. valves of both types. GENERAL UTILITY VISE FOR The vise shown in the illustration
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
