法兰 WN 20(B)-16 RF S=5.54.4 N=727 A=711.2 B=226 SCH4030-28-

WN20(B)-16RF S=5.54.4 N=727 A=711.2 B=226 SCH4030-28-

WN40(A-100 M

bl100(b)-40fm0RF SscRF1ã

WN250-600 RF SCH160

pl50-10ff d=185 aa=80 k

BL50-16 RF5(B)-16 RF

PL150-10RF 9002-148 R/

bl50(b)-16 rf 2ã¤â¸âª/

WN600-10 RJ GB/T21 RF47f.56/0

wn200b-60