Blind flange is also known as blind flange or flange cover (BL). Its material can be divided into: 20#, 304, 304L, 321, 316, 316L, 310S and other materials. The common standard GB, American Standard, Japanese standard, German standard, standard of Ministry of chemical industry, the standard of machinery, pressure vessel standard, following the flange standard.
GB: 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)
5K 10K, JIS, 16K,, 20K (PL, SO, BL, WN, TH, SW)
German standard: DIN2573, 2572, 2631, 2576, 2632,, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH)
Chemical department standards: 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/T79-94 ~ JB/T86-94, JB/T74-1994
Pressure vessel standard: JB1157-82 ~ JB1160-82, JB4700-2000 ~ JB4707-2000 B16.47A/B B16.39 B16.4