GB/T 12459  弯头 DN 150-790ELB=14-16 rf s

DN 150-7 90ELB=14-16 rf s

DN 80×50-Sch40 RC δ=

nb/t47022 t700-1.6/b447

wn500- 25rfxin0-12u

法兰WN150(B)-40FMS©04540 S0RF0 RF1rPN

so150(b)-150rforG/d0 RFm1200-

wn100(a)-100 rf s=4

BL 500-25 RFMF/T(H16FS=21R

WN500(B)-40 RF S=12.50

hg20592bl100-40r