GB/T9119 Type02 F304 PN16 RF Loose Lap Joint Flange is hot-forged rotatable loose ring flange, matched with F304 stub end for complete pipeline connection assembly. Different from integrated welded flange, this split loose flange adopts separated flange ring + pipe end structure, the flange ring can rotate 360°freely without fixing with pipeline, solving bolt hole misalignment, pipeline angle deviation, on-site assembly adjustment pain points for municipal water, factory circulating water conventional piping. It is the most cost-saving flange type for long-distance pipeline laying and later regular maintenance projects.
Made of virgin ASTM A182 F304 austenitic stainless steel, non-recycled raw material, full spectral chemical composition test passed before delivery. Integral die forging eliminates flange inner porosity, improves ring surface compression resistance. The independent loose ring will not bear pipeline medium pressure directly, so it avoids flange corrosion, deformation and cracking caused by long-term medium contact. Only the matched stub end contacts fluid medium, greatly extending flange whole-system service life up to 16 years for neutral water medium piping.
Ra3.2 precision turned RF raised face, compatible with PTFE, rubber, fiber universal sealing gaskets, stable bidirectional sealing for low-medium pressure water fluid. Full body acid pickling passivation enhances outdoor anti-rust performance, suitable for open-air pipe gallery installation. PN16 rated pressure 1.6MPa, standard bolt hole pitch, easy cross matching with national standard pipe fittings. DN25-DN600 full size in stock, supporting matched stub end one-stop supply. Support custom hole spacing, laser logo marking, thickness customization. 15-month factory warranty, complete MTC material certificate, fumigated neutral export packing.
Core Product Advantages:1.360°free rotation, easy bolt hole alignment;2.Split structure no pipe welding deformation;3.Loose ring no direct medium contact, low corrosion risk;4.Lower total cost than integral welded flange;5.Fast disassembly for pipeline routine maintenance
Core Spec: Standard: GB/T9119; Pressure: PN16(1.6MPa); Face: RF; Type: Lap Joint Loose Flange; Material: F304 Stainless Steel; Process: Hot Die Forged + CNC Machining; Size: DN25-DN600; Matching Part: F304 Stub End
FAQ: Q: Do loose flange need welding with pipe?
A: Only weld the stub end to pipe, loose ring keeps movable, no welding on flange ring.
