The Stainless Steel Flat Welding Ring Loose Flange (RJ), also known as Lap Joint Flange, 

is designed for low to medium pressure piping systems that require easy alignment, frequent dismantling, and cost-effective installation.

Its structure consists of two parts: one end of the pipe body connects to the pipeline, 

while the other end is formed as a flange; this flange section is then fitted over a mating flange. 

Specifically, the flange section is manufactured from a lower-grade material, 

whereas the pipe body is fabricated from the same material as the pipeline itself, thereby achieving material conservation.

Flat welding ring loose flange production standards:

National standard: GB / T9112-2000 (GB9113 · 1-2000 ～ GB9123? 4-2000)

American Standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)

Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)

German standard: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH)

Standards of the Ministry of Chemical Industry: HG5010-52 ～ HG5028-58, HGJ44-91 ～ HGJ65-91

Flange standard: HG20592-2009 (PN series) HG20615-2009 (Calss series)

Machinery department standards: JB81-59 ～ JB86-59, JB / T74-1994, JB / T79-94 ～ JB / T86-94

Pressure vessel standards: NB / T47020-2012 ～ NB / T47027-2012, JB1157-82 ～ JB1160-82 B16.47A / B B16.39 B16.48

Keywords ：Stainless Steel Loose Flange, Flat Welding Ring Loose Flange, RJ Flange, Lap Joint Flange, Stainless Steel Lap Joint Flange, Hygienic Stainless Steel Flange, SS316 Loose Flange, Industrial Pipe Flange, Sanitary Stainless Steel Flange