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The sealing ring inside the body (and partially the outer side of the body to make sealing with the counter flanges) is made of PTFE, thus these valves are very resistant to chemical and solvents, have high antiadhesivity and low coefficient of friction and toxicity, maintain their properties at high temperatures. Therefore they are especially suitable in applications for chemical, petrochemical and pharmaceutical industries.

They can be mounted with the stainless disc or PTFE coated disc. In the latter case, the shaft, the disc and the ring are made as a single block.