The most popular type of emergency couplings. The coupling has three shear bolts (the bolts break when the predetermined force is reached) placed on the circumference of the coupling. Before the hose is strained so much that it can rupture or the fittings are pulled out, the breaking bolts joining both halves of the coupling instantly break. At the same time, the spring valves in both halves of the coupling shut, thus prevent leakage of media being transferred. Once the emergency situation is under control, the coupling can be reassembled with a new set of breaking bolts but then it shall be thoroughly inspected prior to further use.
The body of emergency breakaway couplings and the valves are made of aluminium, brass, AISI316 steel, AISI316 steel lined with ECTFE, Hastelloy. The typical couplings with breaking bolts range in size from DN25 to DN150. Working pressure typically up to 25 bar (optionally 40 bar).
The emergency couplings with breaking bolts are common in loading/unloading systems (filling and emptying), industrial systems and tanks, handling hazardous substances in particular. Comply with ATEX, ADR, RID, TDT, Pressure Equipment Directive 97/23/EC.
There is a special type of an emergency couplings – MARINE emergency couplings. These couplings can only be separated by a tensile force applied axially along the hose. The couplings are used for loading/unloading media off the seagoing ships or between two ships and they are mounted between two hoses.