Four-Way Cock Valve
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“Four-way cock, a cock having two passages in the plug and four passage-ways for delivery, or one which unites four pipes so as to deliver from either one at will, according to the position of the valve. Such a cock is used in the continuous air-brake.” -Whitney, 1911
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Fluid MechanicsSource
William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)
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