inside of the boiler ; the latter method requiring a long spindle and socket connected to the valve spindle . In the former method the valve - chest covers are under lock and key , and in the latter the weights cannot be got at ; the valves cannot therefore be tampered with , or the boilers… … Fig \ 342 . — Safety Valve . along to any convenient a , Valve . Chest . c , Weights . D , Slot rod for Position , and supported by E , Lifting arm . f , Guide . lifting arm . a bracket at the end , which is bolted to the top of the boiler ; a long lever handle or other arrangement is fitted at the…
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