HG/T 20592  法兰 PL 80(B)-40 RFhS=5S=4=5RF1.0/12-

pl80(b)-40rfhS=5S=4=5RF1.0/12-

20615BL50-300RF01FA=5 La

PL150B-16RF b=3 D=275 C=17.5 B=160.5 f1=3

JWN 20×40-300 G=SF d=455B)0890R RC-41

so500-40g260-20M28

wn20-300rfsch80

bl350-150 fm/400r0(b)-16/6/

WN300(B)-25 RF/ H=171 A=168 S7-1168 SchF S-8

BL