Oval and Concave-Convex Flanged Weld Neck Flange Introduction

Oval and convex face flanged weld necks are divided by their sealing surfaces. They consist of a combination of two flanged weld necks, one with an oval face and the other with a convex face, commonly referred to as oval and convex. The sealing surface is represented by the letter: FM; English name: so flange.

Features of Concave-Convex Flanged Welding Flanges

Due to the characteristics of its sealing surface, the sealing performance will be better than that of a standard RF flat face flange. Generally, concave-convex flanges are used for sealing in high-pressure pipelines.

Model and Specifications

DN15-DN1000

Pressure Rating

PN6-PN100

Oval and flat faced flanged weld necks material

Carbon steel, alloy steel, stainless steel.

Compliance Standards

China National Standard: GB/T 9116-2010 Flanged Steel Pipe Fittings with Neck Welding

China National Standard for Chemical Industry: HG/T 20592~20635-2009, PN series (European system), Class series (North American system) in HG/T 20592~20635-2009.