ve - rod being lifted and depressed for the forward and backward movements . And thirdly , the link is likewise stationary , oscillating on pins placed on the valve - rod ; the eccentric rods are connected to the sliding - block in the link , the rods and block being raised vertically , so as to… … steam - tight by means of a plaited gasket , and packing pieces of metal inserted in the recesses at the top and bottom ; the steam exhausting into the condenser at the top and bottom edges of the valve , the long D - valve , from its great size , in some instances ex - ceeding 8 feet in length ,…
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