alve is admirably suited for the loco - motive engine ; the rubbing surface on the packing ring is very small , and there can be no doubt that this is a benefit . Care must be taken , however , to have ample provision made for running off any water that may collect when the engine is standing still… … Fig . 74 . — Ratchet - bolt for Valve Rings . packing rings , which are pressed up against the valve ehest door with the set screws . There are holes tapped in the valve - casing door for the reception of screwed plugs . These holes correspond with the snugs and screws for
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