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Non-Return (Check) Valves

PN DN Application 6–16 150–1200 (6–48") Liquids, gases, vapours, 10–160 100–1200 (4–48") corrosive media 10–160 100–1200 (4–48") and low temperaturesEthylene-propylene rubber –40°C to +150°C Fluoro-rubber (e.g. Viton) –25°C to +200°CAcrylonitrile butadiene rubber (e.g. Perbunan) –30°C to +110°C Polytetrafluoroethylene (e.g. Teflon) –25°C to +200°C

Standard materials

Body

For applications involving liquids, gases, vapours and corrosive media, and at low temperatures, there are various materials available. As an option, DISCOCHECK

Grey cast iron Carbon steel Austenitic steell Optionally EPDM FPM (FKM)Optionally NBR PTFE Soft seats
®

dual-plate check valves can be supplied with various soft seats.

Anti-corrosion linings

Body/lining Internals PN DN Temperature limits

Lined cast-iron and cast-steel valves have been applied successfully for many years now in sewage works, supply and treatment plants, and for ship- building and offshore installations.VESTOSINT

Grey cast iron / hard rubberGrey cast iron / VESTOSINT Bronze or 6, 10, 16 150–1200 –10°C bis +90°C austenitic steel (6–48")Bronze or 6, 10, 16 150–1200 –10°C bis +80°C austenitic steel (6–48")
® ®

linings are used e.g. for drinking water and seawater, rubber linings for e.g. seawater and waste water.

Hard-rubber liningPlates with O-rings of EPDMVESTOSINT ® liningPlates with O-rings of EPDM www.gestra.de 19