JIS B2220 & KS D1503
Hebei Xinyue provide a series of Japanese and Korean standard of flanges in carbon steel and stainless steel, include main types of SOP, Blind and SOH.
Slip On Plate (SOP) Flange is the most common flange, it 's wihtout a low or high hub. The pipe is welded onto inside of the bore of the flange.
Blind Flange is a flange without a bore. This flange is used for easy access to lines in which one side of rear part of piping system is closed or reopened after closure and to interior of pipe.
Slip On Hub (SOH) Flange has a low hub as the pipe is inserted onto the bore of the flange before welding. The pipe is welded into inside and outside of the bore of the flange in order to guarantee sufficient strength and prevent leakage. The bore of all slip on flanges is slightly larger than outer diameter of the pipe connected.