HG/T 20592  法兰盖 BL 250-6 FM(B)r50-fS=2.

BL250-6FM(B)r50-fS=2.

wn80(a)-16 RF S=5

BL100-16 FF D=620=33F228°+chF0 RF740 K=70

BL 50-100 RF0sch8B=29 b=pampa

pL25(B)-10 RF B1=46

WN600(A)-16 RF S=1S=2.5mpampa

wn400-600 rf s4=4m S=3(a)-10R

WN80-25 FMb)-GJS=42.9 c=13.

WN25(B)-25M S=4 S=6/F S=12�