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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 housin

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.

대표청구항 ▼

In 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 said ho

In 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 said housing body by a pivot pin-like part of said disc that has opposed ends thereof rotatably received in cooperating recess means in said housing body to provide a pivot arrangement for said valve disc, said valve disc cooperating with said valve seat to define a seating area therewith, the improvement comprising resilient corrosion resistant plastic material completely covering said valve disc and said pivot pin-like part thereof and all of the wettable areas of said housing body so that said housing body and said valve disc and said pivot pin-like part thereof are completely protected from corrosive fluids and the like that might be passed through said valve construction, said plastic material also providing for corrosion free pivoting action of said pivot pin-like part in said recess means as said valve disc is moved by said pressure differential relative to said valve seat and permitting said valve disc to form a tight seal with said valve seat when said pressure differential closes said valve disc against said valve seat, said housing body initially having opening means passing therethrough and said plastic material filling said opening means to close the same and integrally join together parts of said plastic material disposed on opposite sides of said housing body, said opening means connecting with said portions of said housing body that define the parts of said recess means that contact said plastic material on said pivot pin-like part of said valve disc.