GB/T 12459  弯头 DN 50-490ELRF/56--1.0/50 RF Sc

DN 50-4 90ELRF/56--1.0/50 RF Sc

B WN 700-150 RF S=7

SO20(B)-300RFm5=1h

WN15(B)-160RF

SO 80-600RF0 R

IF25(A)-16 rfrf0 rfRF Sc

BI 1600K=0-=1.51/rffsc

3 FM 550-1.0

PJ/SE 250(B)-16 RF5mC

SO 8"-300 RFh�50RF00F Sch450 RF�s=6��Frffs5 RJRF.0=9 RF