| 摘要 |
A ball valve comprising a housing having inlet and outlet ports provided a fluid passageway therethrough, a rotatable closure member disposed within the housing and interposed between the inlet and outlet ports for providing alternate open and closed positions for the valve, a rotatable valve stem secured to the closure member for moving the closure member between the open and closed positions therefor, a valve seat removably secured to the housing and engagable by the closure member in the closed position thereof, and a removable sealing member provided for the valve seat to substantially preclude leakage of fluid around the closure member in the closed position of the valve.
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