. Railway mechanical engineer . con-siderably reduced. The suspension of the generator from thecar body also produces more favoralile conditions w-ith regard towear since the moving parts, both of the generator and the sus-pinsion, receive the lull benefit of the truck springs. PISTON VALVES APPLIED TO SLIDEVALVE CYLINDERS Ibe application of superheaters to existing engines havingslide valve cylinders has heretofore presented serious difficultiesin view of the accepted fact that only piston valves can be usedsuccessfully with superheated steam. The cost of new pistonvalve cylinders with their
. Railway mechanical engineer . con-siderably reduced. The suspension of the generator from thecar body also produces more favoralile conditions w-ith regard towear since the moving parts, both of the generator and the sus-pinsion, receive the lull benefit of the truck springs. PISTON VALVES APPLIED TO SLIDEVALVE CYLINDERS Ibe application of superheaters to existing engines havingslide valve cylinders has heretofore presented serious difficultiesin view of the accepted fact that only piston valves can be usedsuccessfully with superheated steam. The cost of new pistonvalve cylinders with their accessories, together with the newfront frame sections necessary to obtain a good design of cylin-ders; the changes necessary in the valve gear, etc., frequentlyentail so considerable an expenditure as to cause abandonmentof the project. The device here illustrated offers a solution of the problem byenabling a piston valve to lie applied to the existing slide valvecylinders without any nindilication of the cylinders, valve gear. Construction and Method of Application of Universal Piston Valve or other details. It consists of an inner valve chamber to whicha continuous bushing is applied in the ordinary manner. En-closing this is a steam chest secured to the cylinder by the usualstuds without alteration in their original arrangement. Thevalve chamber is secured to the valve seat by four studs, and sixholding-down screws tapped through bosses on the top of thesteam chest, in addition to the steam pressure, which is exertedover practically 70 per cent of the area of the seat. Joint wires of the usual form are used between the steamchest and its seat and wires of the same size are employed be-tween the valve chamber and valve seat. These latter wires arearranged in an ingenious manner to avoid the use of doublewires on. the bridges, where it is difficult to apply sufficient directpressure to bed them into the irregularities of the faces. In this arrangement a joint wire surrounds e
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
