. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . Plate 22, Figure I BLOW-OFF VALVE BLOW-OFF VALVE. 99. FIG. 2—PLATE PNEUMATIC BLOW-OFF VALVE Lore ioo BLOW-OFF VALVE. main drum and blow-off cock is closed, which allows theair to return through the same pipe into which it enteredto the blow-off cock, and through vent port in the cut-outcock, to the atmosphere. The boiler pressure, forcingagainst independent valve 10 and intermediate valve8, aided by spring 6, forces the valves to the
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . Plate 22, Figure I BLOW-OFF VALVE BLOW-OFF VALVE. 99. FIG. 2—PLATE PNEUMATIC BLOW-OFF VALVE Lore ioo BLOW-OFF VALVE. main drum and blow-off cock is closed, which allows theair to return through the same pipe into which it enteredto the blow-off cock, and through vent port in the cut-outcock, to the atmosphere. The boiler pressure, forcingagainst independent valve 10 and intermediate valve8, aided by spring 6, forces the valves to their seats. The blow-off cocks are usually located near the bot-tom of the water-leg. Their purpose is to permit blow-ing out of sediment and impurities from the boiler. When operating the blow-off cock it should never bekept open to exceed 5 or 10 seconds at a time. It shouldthen be closed for short periods. The outward rush ofwater being checked, a whirling action of the water isproduced, which tends to loosen up the mud and sedimentwhich had settled on the tubes, shell of the boiler and inthe water-leg. After an interval of from 5 to 10 secondsthe valve should again be opened. This action should
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