| 摘要 |
A plug valve and method of making same are provided wherein the valve has an outer housing and a flow passage extending through the housing and including an inlet and an outlet interconnected by a bore therebetween. A plastic sleeve is disposed within the housing and lines the bore and such sleeve has a pair of aligned ports therein which are aligned with the inlet and outlet. A rotatable plug is disposed within the sleeve and such plug has an opening therethrough which is adapted to be rotated in and out of registry with the inlet and outlet. The sleeve has substantially rigid reinforcing means embedded therein around its ports which serve the multiple purpose of preventing cold flow of the sleeve adjoining the ports, minimizing fluid erosion of portions of the sleeve adjoining the ports, and increasing the rigidity of the sleeve around each of the ports whereby with fluid flow through the valve at high velocity with the plug rotated to a partially closed position any tendency for the plastic sleeve to be partially moved into the flow passage is substantially eliminated.
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