One-way respectively ball valves will be used for the end of a construction-section, which will be continued later on. As the end-piece will be welded at the pipe end, the existing isoplus pipeline may be continued at any time, without draining the pipes and without interruption of pipeline operation.

One-way ball valves will be welded in closed position into the pipeline, like a piece of pipe. In case of double pipes it has to be considered that the assembling of the ball valves should be made clockwise and longitudinal transposed.