Product Description Product Description MY-1S series Part-turn worm gearboxes suitable for Ball Valves, Butterfly Valves, Plug Valves,etc. Handwheel can choose according to your requirements.  MY-1S series part-turn worm gearbox has good mechanical quality and steady operating performance. It has high mechanical efficiency, with new design, and it’s very easy to operate. The flange connecting to … Continue reading China high quality My-1s Series Part-Turn Manual Valve Worm Gearbox for Butterfly Ball Valves automatic gearbox