Coupling wrench
A coupling wrench is a tool for opening or closing hose couplings, especially for Storz couplings as they are mainly used by the fire brigade in Europe.
It is usually made of metal. The handle of one-sided keys is often coated with plastic to ensure a better grip, while universal keys use one end as a handle. There are several noses on the “mouth” of the keythat fit into corresponding recesses on the coupling. The resulting toothing allows enough force to be applied to the clutch to close or open it. The key is available in two sizes, ABC and BC, which are each used for the couplings of the corresponding hose sizes. Most often, the shape in which all sizes are combined is used. In the past they were forged from steel, today they are mostly made of much lighter cast aluminum or non-sparking copper alloys.
A coupling key is required for each coupling half to open or close couplings. The clutch keys are therefore stored in pairs on the vehicles and removed.
Special forms
For hose lines that are used in potentially explosive environments or for pumping flammable substances, there are coupling keys made of non-sparking brass alloys.
literature
- Lutz Rieck: Die Rote Hefte, booklet 06 - fire extinguishing fittings . Kohlhammer, Stuttgart 2000, ISBN 978-3-17-015171-0 , pp. 36-38 .
- Lothar Schott, Manfred Ritter: Fire Brigade Basic Course FwDV 2 . 20th edition. Wenzel-Verlag, Marburg 2018, ISBN 978-3-88293-220-1 .