| 摘要 |
A valve mechanism for installation in a pipe line for controlling the movement of a flowable material therein that comprises a central body section with end sections connected thereto and forming therewith a valve stopper chamber, the end sections each having an associated annular extension projecting into the valve stopper chamber and having an external sealing surface and an internal fluid-flow passage extending outwardly therefrom; a valve stopper in the chamber having a flow passage extending therethrough and sealing surfaces bounding the flow passage; a structure for moving the stopper to a valve open position substantially aligning the stopper flow passage with the extension flow passages, and to a valve closed position with the stopper sealing surfaces extending beyond the annular inner face of the extension; an annular gasket encircling each end section extension and thrust structure operable to compress the gaskets against the sealing surfaces of the extensions and stopper when the stopper is in valve open and valve closed positions; the thrust structure being operated by a plurality of solid parts sealably housed within the valve stopper chamber.
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