Donggang Shengye Mechanical Processing & Technology was established in 2000 which is located in Liaoning, China. Our company specialises in manufacturing various valves, fittings, flanges and relative products in wide range of materials includes, Cast Iron, Bronze, Ductile Iron, Aluminium, Ferrous Alloys, Carbon Steel and Stainless Steel… etc.Our products are designed, manufactured and shipped in compliance with API, ASTM, JIS, DIN, DAN, SMS and many other international quality standards from the spectroscopic tested, casting to the final assembly and thorough inspection processes. In our production, we have fully traceable raw materials, CNC machined parts, ball polished to a mirror finish, seats and seals all manufactured within the dictated tolerance. We also contain unique design fea..