In this type of T-valve, the T-valve is as close as possible to the internal contour of the main pipe and has a self-draining net tilt angle, because there is basically no retention area. The T-body is best welded to the vertical outlet of the annular main pipe. In this mounting position, the media can be easily drained. The T-body can also be used for sampling in main loops such as DN50 and outlet DN15. and the cavity is fully formed, with a dead space ratio < 1D Compact designs are optimal if mounted at an angle.