AFNOR (Association Française de Normalisation) is the French association for standardization with the task of governing the national regulatory system and upholding the interests of France in the field of international standardization, promotes the application of the law and develops certification products and services.
This activity covers the Guillemin standard for symmetrical coupling (standard NF E 29572) also called coupling Fire AFNOR, that is widely used for the extraction and transfer of products in chemical industry, agricultural and irrigation applications for pressures up to 16 atm.
Being symmetrical couplings, the two elements that engage with each other are placed opposite one another creating a perfect seal, and with a twisting motion in opposite directions, thereby making half a revolution of the rotating bezel of each driving the two together. The coupling is done by hand, but requires a special tool to tighten the connection.
The symmetrical coupling Guillemin (AFNOR) is available in brass, aluminum and stainless steel.