Creighton, William Henry Paul, 1859- · New York, J. Wiley & sons; [etc., etc.] · leaf 393
be a balanced valve. Exposed to high pressures, it must be verystiff to maintain the truth of its steam-surfaces, and it must alsobe tight when highly heated. The valve that best satisfies these 372 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. requirements when superheated steam is used is a… … Fig. 204.—Double Poppet-valve used as a Governor. opposite directions at all times. Old forms are illustrated inFigs. 199-202. The valve of the Putnam engine is shown in Fig.203. (See page 440.) CHAPTER XIIl. SPEED VARIATION CONTROL. Turning Effort in the Crank-shaft.—The motion of a body isuniform…
Steam-engines · Heat-engines
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