| 摘要 |
<p>A wafer-type swing check valve construction having a metallic housing body provided with an inlet and an outlet interconnected together by a valve seat that is adapted to be opened and closed by the effect of a pressure differential acting across a metallic valve disc pivotally mounted to the housing body by a pivot pin-like part of the disc that has opposed ends thereof rotatably received in cooperating recess means in the housing body to provide a pivot arrangement for the valve disc, the valve disc cooperating with the valve seat to define a seating area therewith. A resilient corrosion resistant plastic material completely covers the valve disc and the pivot pin-like part thereof and all of the wettable areas of the housing body so that the housing body and the valve disc and the pivot pin-like part thereof are completely protected from corrosive fluids and the like that might be passed through the valve construction, the plastic material also providing for corrosion free pivoting action of the pivot pin-like part in the recess means as the valve disc is moved by the pressure differential relative to the valve seat and permitting the valve disc to form a tight seal with the valve seat when the pressure differential closes the valve disc against the valve seat. The valve construction can be clamped between mating flanges of a pair of conduits to couple the same together without having any point for external leakage around the pivot arrangement.</p> |
