he steam pipe , and has a boss forged on it , which hoo c on,,oi - o This receives a square part on ' freely thereon ; thus by turning / es are opened and shut by the d of the valve spindle . Another - action regulators has a brass circular box bolted to the back of the fire - box shell , having a… … Fig . 416 . — Double - beat Valve Regulator . a , Valve ehest . b , Double - beat valve . c , Screw on the spindle . d , Rod . e , Stuffing box . f , Regulator handle . segment , thus pushing the valve firmly against the seat ; and on being turned the other way the handle bears on the opposite side…
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