... butterfly valve DN50-1200 or 2-48'' PN10/16/25 With CE and ISO certificate Standard:DIN,BS,API,JIS,MSS etc ... 3) Minimized operating torque, energy saving4) Quick on-off operation and Excellent regulation performance5) Wide selection of materials, application for various ... operation mode like manual ( lever, handweel or gearworm), electric and pneumatic actuator and so on. Our brand is TST. We regard the ...