Flanged Worm Gear Butterfly Valve

Material of the Valve: cast iron, ductile cast iron, stainless steel
Material of the Rubber Ring:
natural rubber (NR) -20~+85°C
ethylene propylene rubber (EPDM) -40~+125°C
acrylonitrile-butadiene rubber (NBR) -20~+82°C
silicon rubber (SI) -70~+150°C
fluororubber (VITOH) -23~+150°C
chloroprene rubber (CR) 0~+80°C
butyl rubber (IIR) -40~+100°C
plastic of poly tetra fluoroethylen (PTFE) +10~+150°C