. Science of railways . Fig. 2. Fig. 3. Exterior View. Sectional View. The Star Improved Open or Plain Locomotive Pop Safety Valve. Figs. 4 and 5 illustrate the muffled Star pop safetyvalve, which is seen to be similar in construction,with the addition of the top hood, or muffler, whichtends to greatly reduce the noise of the escapingsteam, and hence is of considerable advantage. Boththe plain and the muffled valveshave large reliefpowers, and are made to withstand the highest pres-sures used on locomotives. The slotted domes andmufflers have their real aim in preventing dirt andcinders from e
. Science of railways . Fig. 2. Fig. 3. Exterior View. Sectional View. The Star Improved Open or Plain Locomotive Pop Safety Valve. Figs. 4 and 5 illustrate the muffled Star pop safetyvalve, which is seen to be similar in construction,with the addition of the top hood, or muffler, whichtends to greatly reduce the noise of the escapingsteam, and hence is of considerable advantage. Boththe plain and the muffled valveshave large reliefpowers, and are made to withstand the highest pres-sures used on locomotives. The slotted domes andmufflers have their real aim in preventing dirt andcinders from entering the interior of the valve andclogging its free action. All hability of back pressureon top of valve, which causes continual chattering, isremoved. By removing the small set screw, shown at the right LOCOMOTIVE APPLIANCES. 229 of both types of valves shown, and turning the ringwithin to the right or left with a pointed instrument,
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidscienceofrailway14kirk
