|All couplings you need|
Since 1977 POK® has been building fire couplings in accordance with the various standards existing on the planet, or sometimes outside the standards as for Storz DN200 and 250 couplings. Thus you can buy “Barcelona” couplings, British Instantaneous couplings in DN45 and DN70, American fire couplings, 3-piece non-symmetrical screw couplings with very good pressure resistance.
GOST (Russian) couplings, Japanese Machino couplings which as well as Instantaneous couplings are not symmetrical, Chinese couplings, Canadian forest fire couplings and Canadian couplings from different regions, Italian, (UNI), Dutch, French (and Belgian) couplings, German Storz couplings found in many parts of the world, and some others with specific features.
Why so many different and generally incompatible models? We sell our equipment in more than 100 different countries and it is necessary for customers in these countries to be able to use their acquisitions.
It must be understood that a hundred years ago or more, the different regions of the world began to understand the need to be able to connect fire pumps to hoses. The first to become aware of this necessity was Napoleon Bonaparte who, having witnessed the destruction of the Austrian Embassy by fire, decided to create the Paris Fire Brigade at the beginning of the nineteenth century.
Back in the day, the inhabitants used to make the chain to transfer fire-fighting water by buckets from water points. This process was still used until the middle of the twentieth century. For a long time the material of the couplings was Bronze because aluminium alloys were not always available.
At the beginning of the nineteenth century and for a long time, hoses were made out of leather, the edges were brought together and riveted, so that the operating pressure was not very high and that the couplings were not subjected to high stresses, which changed in the twentieth century with new pumps and woven textile hoses.
In France, an officer of the Paris Fire Brigade, Mr. Delieuvin, in collaboration with industrialists, has developed DSP and AR couplings to meet the new mechanical requirements. In Germany, a Mr. Storz developed a coupling that bears his name with comparable characteristics, but adapted to the techniques of German manufacturing, the forge.
Because they sent sales representatives all over the world, the Storz was used in many parts of the world such as Poland, Brazil, China, Chile, etc….
The French coupling was found in Belgium and in the former French colonies.
As for American couplings, apart from the NST NH and NPSH standards, they are incompatible with each other in many US counties, and sometimes different in the same city. Thus in New York there are 3 different types of threads.