The ABV series breakaway couplings separate the line at a defined tensile load. This should be selected with a sufficient safety margin below the load limit of the line, such as the maximum tensile load of a hose line. Both coupling halves are equipped with a non-return valve each that allows to close the line impermeably when it is separated and to exclude that the medium escapes into the environment.
The basic principle:
The ABV series couplings consist of two almost identical coupling halves. These are connected via a pair of flanges by means of three breaking pins during normal operation. The flanged connection has no overlaps, so tensile forces acting on the line are directly transmitted to the breaking pins. The ABV function is available without limitation of the load angle. When pure axial load is applied, the tensile force is distributed evenly to all three pins so that the threshold for triggering is the highest here. However, when lateral tensile forces are applied, the load is distributed unevenly to the breaking pins; the load increases with the size of the angle to the coupling axis. The load then increasingly focuses on one or max. two pins, so that the planned separation takes place at a lower threshold value.
If their tensile strength is exceeded, the pins break and the flanged connection is loosened. In this case, the separated coupling halves must be closed immediately; for this purpose the two housing halves are equipped with spring-loaded non-return valves. In the operating state, they brace each other and keep the flow cross-section open. In the case of separation the mutual support effect of the valves no longer exists so that they abruptly close each cross section being released.