Also known as loose flange, it is a flange that is fitted onto the pipe end using flanges, steel rings, etc. The flange can move on the pipe end. The steel ring or flange is the sealing surface, while the function of the flange is to press them tightly. From this, it can be seen that due to being blocked by steel rings or flanges, the loose flange does not come into contact with the medium. Because flanges are movable and not directly connected to pipelines, they are called loose flanges.
The standard for condoms:
National standard: GB/T9112-2000 (GB9113.1-2000~GB9113.4-2000)
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）
Ministry of Chemical Industry standards: HG5010-52~HG5028-58, HGJ44-91~HGJ65-91, HG20592-97 series, HG20615-97 series
Mechanical Department Standards: JB81-59~JB86-59, JB/T79-94~JB/T86-94, JB/T74-1994
Pressure vessel standards: JB1157-82~JB1160-82, JB4700-2000~JB4707-2000 B16.47A/B B16.39 B16.48