GB/T 12459  弯头 DN 50-Sch2090ELch89r0 B=2FMLF

DN 50-Sch20 90ELch89r0 B=2FMLF

so450-600 rf hg-2/

PL300(B)-16 RFa03RF/25 r/)- s=4RF R

PL300-16RF00-150RF=-2009 S=10RJ HG/T

WN 450(B)-25 FM S=8)-10R4rf0sfch80F

WN50-100TRF50cpampampRF S= RF S0F16RF S=4.5f6 RRF6 RF723m

47023 fm 600-1.0 ãžâ

PL100(