| 摘要 |
<p>According to one aspect of the invention there is provided a cut-off valve for controlling flow form a mains supply, the valve having a valve body; a spindle assembly removably couploed to the valve body, the assembly including a spindle assembly body; a spindle threadable mounted in the spindle assembly body; a valve element coupled to an end of the spindle and arranged to be seated or unseated form a a valve seat by rotation of the spindle relative to the spindle assembly body; the spindle includng at least one O-ring which seals against a bore in the spindle assembly body; characterised in that, on removal of the spindle assembly form the valve body, the spindle can be rotated form its closed position in which the valve seat is seated against the valve seat to a servicing position in which the at least one O-ring disengages the bore thereby permitting replacement of the at least one O-ring.</p> |
