, the ring is recessed in the valve - casing cover , and pressed up with set screws against the valve . The object of both of these plans is to obtain a large area on the back of the valve from which the steam in the casing is excluded by means of the metallic rings , which of course do not leave… … the reception of the packing rings and springs ; F i g . 274 . - sprm g and p a dd ng it is of a curved shape , quite plain on the for siide Valve . outside , and well ribbed on the inside , which prevents the dust from lodging , and the plain c < Spring , d , Set screw . . . . E , Valve - casing…
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