Home / Markets / WEAVALVES / Products / Valves / Valves / Butterfly Butterfly Butterfly valves are quarter-turn butterfly valves available in manual, electric, and pneumatic actuators. There are steel and plastic models. Manual gear operators and SAE valves are available in the manual category. A few models have a cartridge seat design which alleviates installation problems. Automated Quarter-turn butterfly valves available with electric or pneumatic actuators. Applications include valve automation. Capable of being configured to fit any application. Manual Quarter-turn butterfly valves available with manual hand lever or hand wheel actuators. Steel and plastic models. Manual gear operators and SAE valves.