Electric actuator butterfly valve DN50-1200 or 2 ... certificate Standard:DIN,BS,API,JIS,MSS etc Electric actuator butterfly valve Feature:1) Standard for face ... selection of materials, application for various medium like fresh water, sewage, sea water, air, vapor, acid and so on. Material ... operation mode like manual ( lever, handweel or gearworm), electric and pneumatic actuator and so on. Our brand is ...