| 摘要 |
A unitized check valve for use with corrosive fluid includes a generally cylindrical body. A valve seat is disposed in the body and a first set of angularly spaced apart arcuate flanges depends from the outlet end. A valve disk is coaxially associated with the seat and is adapted for axial movement to block and unblock the aperture in order to control the flow of fluid through the body. A valve retainer has a second set of angularly spaced apart arcuate flanges. The flanges of one of the sets extend generally radially inwardly and the flanges of the other one of the sets extend generally radially outwardly. The flanges of the second set are positionable between adjacent ones of the flanges of the first set. A coil spring bears against the valve disk and the retainer and is responsive to flow fluctuations on the disk for thereby permitting movement of the disk. Alignment of the flanges of the second set between the flanges of the first set and rotation of the retainer causes the flanges of the second set to be engaged with the flanges of the first set for thereby preventing axial displacement of the retainer so to maintain the valve in operative condition.
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