| 摘要 |
<p>A shut-off valve adapted to be used to advantage in pipework installations carrying liquid, semi-liquid or pasty material has a housing having a bore therein and ports in the wall for the connection of conduits. A member for selectively closing the ports is rotatably disposed in the bore of the housing. The housing has annular wedge shaped surfaces on opposite sides of the bore and the closure member has tapered conical surfaces which are disposed against the wedge shaped surfaces of the housing.</p> |
