Harmsworth, Alfred Charles William, Sir, bart · London Bombay : Longmans, Green, and Co. · leaf 161
Fig. 14.—The Throttle Valve The first of these methods (a) is one of the simplest known,and is merely the application of the old butterfly pattern valveso long in use on the steam engine. The method of its actionmay be readily understood by describing it as a means ofblocking the area of the inlet…
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