They are either made of zinc-plated steel, aluminium or stainless steel. The lever couplings are intended for irrigation and drainage pipe systems (sprinklers, construction and road works, sewage treatment, groundwater control – well point dewatering system) As the couplings feature simple, very robust construction and leak tightness even if fairly contaminated with impurities, they are perfectly suitable for both piping systems and flexible hose assemblies – for water, sewage, liquid chemicals, petrochemical and food products. However, the lever couplings can also be used for loose materials loading and unloading (cement, lime, materials, feed, granules, grain, flour etc.).
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STORZ Couplings
STORZ symmetrical couplings were designed in 1882 by Guido Storz and patented in Switzerland in 1890. In many European countries they became the standard couplings for fire fighting hoses and equipment. Hence STORZ coupling is popularly called a fire fighting coupling or fire hydrant coupling. Today it is widely used in fire protection systems, but also as a coupling for general industrial application for liquid and dry loose substances in the chemical industry, food industry, agriculture, construction, irrigation systems and sewage transport, in road tankers for loose bulk substances, etc.
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Industrial Fittings
Tankwagen Couplings (TW)
TANKWAGEN couplings (TW couplings, tanker couplings, eurocouplings) are commonly used for loading and unloading of tankers and in installations in the chemical, petrochemical or food industry. TW couplings are made according to EN ISO 14420-6 standard (former DIN 28450).
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Industrial Fittings
Ectfe Lined Couplings
Sometimes the corrosive resistance of AISI 316 acid resistant steel is challenged by highly aggressive chemicals (e.g. hydrochloric acid HCl). Then it is necessary to use either very expensive couplings made of special nickel-based alloys (e.g. Hastelloy) or less expensive couplings lined with ECTFE. The last couplings are made of AISI316 steel however all inner surfaces in contact with the medium are powder coated with ECTFE lining.
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