| 摘要 |
<p>A tool assembly is disclosed which, in a preferred embodiment, is an isolation valve (10). The valve (10) is configurable in closed and open configurations and allows, for example, pressure testing of tubing above the valve (10) and isolation of upper and lower sections of the tubing. The valve (10) generally includes a concave valve flap (12), tubular housing (14), upper sleeve (16), annular seal assembly (18), first and second lower sleeves (20, 22) and a lower sleeve locking assembly (24). The valve flap (12) is movable from a closed configuration, where it lies substantially perpendicular to the housing (14), to an open configuration, where it lies in a recess (84) in the housing (14). This is achieved by supplying hydraulic control fluid through control conduits (17, 19) to move the sleeves (16, 20, 22) and displace the flap (12) into the recess (84), which is uncovered by the lower sleeves (20, 22).</p> |
