The standards for Zhongyuan’s chemical valves differ minimally from national valve standards, primarily in the classification of flange faces. The flange faces for chemical valves mainly include: Slip-on Welding Flange, Neck Flange, Butt Weld Flange, Ring Joint Flange, Socket Weld Flange, and Blind Flange.
Internationally, pipe flange standards are divided into two major systems: the European system represented by Germany’s DIN standards, and the American system represented by the ANSI standards. Additionally, Japan’s JIS pipe flange standards exist but are primarily used in utility engineering within petrochemical facilities and hold limited global influence.
