| 摘要 |
<p>PCT No. PCT/NO85/00062 Sec. 371 Date Apr. 22, 1988 Sec. 102(e) Date Apr. 22, 1988 PCT Filed Oct. 3, 1985 PCT Pub. No. WO87/02094 PCT Pub. Date Apr. 9, 1987.Shut-down valve intended for use in a subwater/subliquid position, for instance in subsea pipelines for liquid/gas. It is an object to prevent the medium surrounding the valve, to penetrate the pipesystem which is being served by the valve, and at the same time counteract the through-flowing fluid to be released into the surrounding medium when the valve is to undergo maintenance. The valve comprises a valve housing comprising a cylindrical valve chamber (12,13), which is intended for being oriented along the direction of flow F of the liquid/gas, and a radially arranged valve chamber (14), which is closable with a removable bonnet (9), and also a clack-valve body (3) which is movable between a closed position and an open position. The shut-down valve is characterized by a clack-valve body (3) pivotally mounted to the bonnet (9) and the valve is provided with a trunk piston (7) which is axially displaceable in the cylindrical valve chamber (12,13) of the valve housing between an advanced position where it extends over the radial valve chamber (14) of the valve housing and in this way is separating it from the cylindrical valve chamber (12,13), in such a way that maintenance may occur without the surrounding medium coming into contact with the through-flowing fluid and a retracted position in which the trunk piston is retracted from the area of the radial valve chamber (14).</p> |
