Clack-valve
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“A valve in pumps with a single flap, hinged at one edge, and consisting of a plate of leather a little larger than the valve aperture. The valve box is generally one and a half times the diameter of the valve opening.” — Williams, 1889
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Machines PartsSource
H. L. Williams The World's Cyclopedia (New York: World Manufacturing Co, 1889) 116
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