Steam engines, prepared in the Extension division of the University of Wisconsin (1919)
Shealy, Edward Marvin · New York, McGraw-Hill · leaf 29
alve is large, the valve is pressed against itsseat with an enormous pressure, requiring a large amount ofwork in moving the valve. The large area of the valve alsomakes it difficult for oil to get between the valve and its seat tolubricate it. Some valves have balance platis which cover about 14… … Fig. 8. and is not enough to cause undue friction. The balance plateis adjustable to allow for wear of the valve, being held in positionby screws which press against the sides of the steam chest andhold it in place. f^///////y/^ /yyy/y^-v^
Steam-engines
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