The material of the seat ring determines the media resistance and temperature limits of the butterfly valve:

• EPDM – For water, hot water, steam, diluted acids and alkalis, as well as media used in water treatment and the food industry. Not suitable for oils. Up to approx. 120 °C.

• NBR (nitrile) – For mineral oils, fuels, greases and oil-containing media. Not suitable for hot water or steam. Up to approx. 80 °C.

• PTFE – Virtually universal chemical resistance to aggressive acids, alkalis and solvents. The first choice in the chemical and pharmaceutical industries – available as a PTFE butterfly valve.

• FKM / Viton® – High resistance to aggressive chemicals, solvents and elevated temperatures up to approx. 180 °C. Ideal for demanding process media.

If you are unsure about media compatibility, the FERGO team will be happy to provide individual advice.