. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . he independent valve 10 fails toseat, the intermediate valve 8, which is fastened to airpiston 5 by stem 3, will then seat and prevent theboiler from being drained. If the independent valve 10and intermediate valve 8 fail to seat, a provision ismade in the valve by which intermediate valve 8 canbe forced to its seat by means of screw plug 2, whichis attached to air piston 5. In the normal position ofscrew, plug 2, the threads of the screw plug are flushwith the
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . he independent valve 10 fails toseat, the intermediate valve 8, which is fastened to airpiston 5 by stem 3, will then seat and prevent theboiler from being drained. If the independent valve 10and intermediate valve 8 fail to seat, a provision ismade in the valve by which intermediate valve 8 canbe forced to its seat by means of screw plug 2, whichis attached to air piston 5. In the normal position ofscrew, plug 2, the threads of the screw plug are flushwith the thread box in casing 1, which is shown onPlate 22. The blow-off cock is operated by air, having a pipeconnection 14 extending from the blow-off cock to thecab, which admits air to piston 5, forcing the piston in-ward and compressing spring 6, unseating intermediatevalve 8 and forcing independent valve 10 from its seatagainst boiler pressure, which allows the waste water topass by boiler check and intermediate valve 8, throughwaste-pipe 13 to the atmosphere. To close the blow-off cock the air-valve between the 98 BLOW-OFF Plate 22, Figure I BLOW-OFF VALVE BLOW-OFF VALVE. 99
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