Electric actuator butterfly valve DN50-1200 or 2-48'' ... ISO certificate Standard:DIN,BS,API,JIS,MSS etc Electric actuator butterfly valve Feature:1) Standard for face to ... carbon steel, Al bronze or other materials you require. c) Seat: EPDM, NBR, PTFE, VITON d) Stem: Carbon steel, ... operation mode like manual ( lever, handweel or gearworm), electric and pneumatic actuator and so on. Our brand is TST ...