. Electric railway review . e noted that thevalves in Figure 369 close against the pressure and the valvesshown in Figure 360 close with the pressure. These arethe two principal types of blow-off valves. Figure 371 (S 2-4) shows a valve which closes againstthe pressure with the bonnet and stuffing box on the lineside. Figure 372 (S 2-5) shows a valve with the pressure onthe stuffing box and bonnet. It will be noted that both valveshave a plug which shuts off the flow before the valve closeson its seat, the plug serving to hold back the heavier scalefrom the seat. Each valve has a soft disc. Th
. Electric railway review . e noted that thevalves in Figure 369 close against the pressure and the valvesshown in Figure 360 close with the pressure. These arethe two principal types of blow-off valves. Figure 371 (S 2-4) shows a valve which closes againstthe pressure with the bonnet and stuffing box on the lineside. Figure 372 (S 2-5) shows a valve with the pressure onthe stuffing box and bonnet. It will be noted that both valveshave a plug which shuts off the flow before the valve closeson its seat, the plug serving to hold back the heavier scalefrom the seat. Each valve has a soft disc. The disc in thevalve shown in Figure 372 is run into the plug and then ma-chined. The disc of the valve shown in Figure 371 is a loosering of soft metal which can be replaced quickly by separat-ing the two parts of the valve. The thread connecting the two parts of the valve is thereverse of that on the stemso that pressure tends tokeep the valve parts to-gether. The valve shown inFigure 372 has two largestandard machine bolts. P/./J/VFigure 370 (S2-2).
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
