GB/T 12459  同心异径管 DN 80×50-Sch40RC

DN 50×80-Sch40 RC

PL350(B)-10 RF0 RF Sc

SO150-40T0RFFMrfFF

A WN 1500-600 RF S=22

3 FM 1200-6.4 δ0=20 DN

PL 450(B)-6 RF=

B WN 1200-150 RF S=20

PL60-6RF97RF10�

so50-300RF,Sch4

WN 400(B)-16 RF00FF400-0.6ط�sch4f� RF Sch40 B=8B=30 RFc0 S=2F h4pR@