Patent ID: 8991874
Filing Date: 2015-03-31
Classification: F16L

Abstract:
1. A coupling unit for branching off a liquid from a pipe or a stationary unit or for supplying or removing a liquid from a flexible hose connection into the pipe or into the stationary unit, or into a further flexible hose connection, a part of the coupling unit being fastened with a section in the pipe or in the stationary unit, comprising a nipple part, a coupling part, the nipple part and coupling part each including a valve body, which is spring-biased into a closed position, and being displaceably held in the nipple part and the coupling part, respectively, the nipple part being composed of a nipple element and of a first inserted locking piece and the coupling part being composed of a coupling element and a second inserted locking piece, a respective O-sealing ring being arranged between the inserted locking pieces and the nipple element and the coupling element, respectively, circumferentially extending projections formed on the coupling element, nipple element and locking pieces, which when viewed in cross-section are substantially serrated, the projections on the locking pieces engage with the projections on the coupling element and the nipple element when inserted therein, thereby locking the coupling element and the nipple element to their respective locking pieces, and at least one circumferential section of the locking pieces are free of the serrated projections and create a guide means for a twist-proof inserting operation.