HG/T 20592  法兰 WN 500(B)-25 RF S=10wd=b)=210 δ

WN 500(B)-25 RF S=10wd=b)=210 δ

lWN40-150 RF B=41 d=/RF7040½ Sh1fff

PL125(B)-6RF b=2/

WN250(B)-150 RF S=6.0135r

wn25-150 rf sch80sc

WN25(A)-25 RF S=516 M/p SCHSD=

BL150-6 RF h RF4F0-=120.7d==S-150 RF Sch80Srfa=

WN25(A)-25 RF S=5

PL20(B)-25 RF ,HG