The valve driving device is one of our main products which has formed three big series and nearly 100 specifications. Annual output is 200000 sets and expor to United States, France, Canada, South-east Asia, over more than ten countries. It is worm&grear-drive, operated with hand, electricity, phneumatic, suitable for connection at of revolving valve, butterfly valves and ball valve. We also welcome orders with specical specifications and requirements. It was awarded 1996's quality product of Shanxiprovince. Customers both at home and abroad are welcome to come and have businese with usm.