The breakaway coupling with low temperature properties and load-limited triggering via breaking pins
The solution for cryogenic media
The ABVC series was particularly developed for low temperature applications / cryogenics and provides high flow rate at the usual RS safety standard. As well as ensuring compliance with the corresponding leak rates, using our breakaway coupling provides protection across the entire temperature range from -196 °C to 60 °C.
The ABVC 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 ABVC 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 ABVC 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.
其特有的低温密封技术确保拉断阀在常温和低温都能发挥作用，目前ABVC型在LNG液化天然气、液氧、液氮、液氩、低温乙烯、低温二氧化碳等低温介质中均有应用，同时ABVC型拉断阀是业界流速领先的低温拉断阀。其高等级的 耐低温 不锈钢阀体材质配合稳定的密封组件能确保在极寒的情况下运行自如。