DSP coupling

{{Short description|Self-sealing symmetrical coupling for fire-fighting hose}}

{{More citations needed|date=July 2023}}

A DSP coupling is a self-sealing symmetrical coupling which is secured by inter-connecting two couplings together.

It is closed by turning the locking ring on the triangular part of the opposed DSP coupling.

Extra closure can be applied by locking the connection with couplings wrench.

File:Dsp hose groove.png|DSP coupling

File:Dsp spanner.png|DSP wrench

File:Borne Incendie Col-de-cygne 15dec2009 Liege.jpg|Coupling on a Belgian fire hydrant with a DSP connection to deliver water to an individual.

The DSP coupling locking principle is similar to that of the guillemin coupling.

However, there are differences to the preformed serration on the locking ring and the design of the lugs.

The locking ring of DSP couplings can be turned up to 45°.

DSP coupling are used as fire-fighting couplings.{{Cite web |date= |title=DSP fire-fighting couplings - Pathel Industrie |url=https://www.pathel.com/en/products/couplings-and-fittings/dsp-fire-fighting-couplings/ |archive-url=https://web.archive.org/web/20210225191319/https://www.pathel.com/en/products/couplings-and-fittings/dsp-fire-fighting-couplings/ |archive-date=2021-02-25 |access-date= |website=www.pathel.com}}{{Cite web|url=https://lmc-couplings.com/en/products/quick-couplings/dsp-couplings.html|title=DSP couplings|website=lmc-couplings.com}} They are typical in for e.g. France{{Cite web|url=https://en.osw-eschbach.de/project/dsp-schlauchkupplung/|title=Coupling to French Standard DSP/AR | Ohrdrufer SchlauchWeberei Eschbach|website=en.osw-eschbach.de}} and Belgium.

DSP couplings are symmetrical.{{Cite web|url=https://www.fire-coupling.com/The-Difference-Between-Guillemin-couplings-and-DSP-couplings-n.html|title=The Difference Between Guillemin couplings and DSP couplings|website=www.fire-coupling.com}}

DSP comes in different sizes. (e.g. DN40 DN65 DN100).

Typical materials for the coupling are aluminum, brass and bronze.{{Cite web|url=http://www.sides.fr/en/product/coupling-dsp-ar-bsp-thread/|title=Coupling DSP AR | Véhicules de secours et de lutte contre l'incendie - Sides|date=March 14, 2017|website=www.sides.fr}}

For the Origin or meaning of "DSP" there is only speculation.:fr:Raccord sym%C3%A9trique Guillemin{{Circular reference|date=September 2023}}