HG/T 20592  法兰 WN 50(B)-25 RF S=400 RF S=32RFF500RF500e2/RF5s-

WN50(B)-25RF S=400 RF S=32RFF500RF500e2/RF5s-

WN100-300 RF Sch40 RF RF S=28S RF50-16rf.6/h40.0-75aa=105 c c)F990a@bh

WN 100B-40M S=≥5F S=≥3Mch40-150

PL250(B)-16 RF

DN80-PN100 WN RF I

WN 50(B)-16 RF Sch40

PL 400(B)-10 RF

PL 200(B)-16 RF b=0

WN 5