Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . Fig. 293. Ports F and D allow the brake cylinder pressure aroundthe piston HS 107, and back of the valve HS 108, sothat the piston is free to operate at a slight differenceof pressure. Fig. 293 is a sectional view of the lever safety valve,furnished with schedules B2, B2-S and B2-HP. Fig. 294 shows the quick release valve which is used 66o LOCOMOTIVE ENGINEERING with the B2-S equipment, for switch engine service, toquickly release the
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . Fig. 293. Ports F and D allow the brake cylinder pressure aroundthe piston HS 107, and back of the valve HS 108, sothat the piston is free to operate at a slight differenceof pressure. Fig. 293 is a sectional view of the lever safety valve,furnished with schedules B2, B2-S and B2-HP. Fig. 294 shows the quick release valve which is used 66o LOCOMOTIVE ENGINEERING with the B2-S equipment, for switch engine service, toquickly release the pressure from the driver brakecylinders. The lever safety valves shown in Figs. 292 and 293 arefor use at all times to graduate off brake cylinder pres-sure, after an application of train brakes, when the sameis desired. These valves are set at fifty-three pounds, andshould be so adjusted in RV M£RVI40HV 137RV 139 CV2S4CV25SV«S9 The two lever safety valves, although similar in ap-pearance, are different in operation. In Fig. 292 thevalve RV 133 is of a pop-safety valve design, and whenforced open will remain so until the pressure beneathit has fallen to a trifle less than the force exerted againstit by the spring RV 105 A. The safety valve shown inFig. 293 is an ordinary blow-down pop valve, and whileit will operate and reduce brake cylinder pressure tothe desired amount, is not as free an operating valve as HIGH SPEED CONTROLLER 661 the one shown in Fig. 292. It is obvious to state thatthese lever safety valves are also for use to keep thebrake cylinder pressure within a certain prescribed limit,as, if they were not used, an application of the straightair brake, followed by one of the automatic, wouldgreatly increase the brake cylinder pressure over the pre-scribed limit. The quick release valve shown in Fig. 294, as beforestated, is for use with schedule B2-S switch e
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
