Wafter-type butterfly valves have nominal diameter of DN40-DN1000 and working temperature covering -35°C-35°C for water, sewage, oil, acid and alkalis. Lug-type butterfly valves have nominal diameter of DN40-DN300 and working temperature covering -45°C-50°C for water, sewage, oil and acid. Models fabricated at ANSI, DIN, BS, JIS, AS and ISO standards.