Steam engines, prepared in the Extension division of the University of Wisconsin (1919)
Shealy, Edward Marvin · New York, McGraw-Hill · leaf 183
ame amount of port opening.The smaller travel of the multi-ported valve reduces its frictionand the amount of work necessary to move it, and at the sametime, makes effective lubrication easier. Multi-ported valves are usually placed across the cyhnder, asshown in Fig. 103, instead of lengthwise of… … Fig. 104. Some of the sUde valves which have been described and illus-trated are balanced or partly balanced. Most balanced valves,except piston valves, are balanced by means of a balance plateover which the valve shdes, or by means of a balance ring recessedinto the back of the valve and sUding on…
Steam-engines
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