| 摘要 |
<p>Shut-off device for a pipe for a liquid, in particular pressurized crude oil, a pipe baffle, having an opening in the form of a valve seat for a valve flap placed upstream, being spring biased toward closed position, an appurtenant hydraulic cylinder being arranged to overcome the spring bias upon pressurizing in order to keep the flap in open position. An appurtenant hydraulic pipe extend along the liquid pipe and locally pressurizes the valve hydraulic cylinders, and a pump-out valve having a relatively small valve area through the stoppage has a throughput channel between the upstream and downstream side of the baffle, the pump-out valve being spring biased toward closed position and being kept open by a hydraulic cylinder, which is fed by the hydraulic pipe.</p> |
