GB/T 12459  同心异径管 DN 80×50-Ⅱ-Sch40RCFFFfSShR6r0

DN 80×50-Ⅱ-Sch40 RCFFFfSShR6r0

so25(b)-25tg

WN 50-2500 RFFfF5F&6FF1MR..ha�00.5F5RFaF5

so80-40fm

PL20(A)-6 RF b=3

SO 50(B)-16 RF

WN450-300FF/ sc04005RFpjy F0

wn 15-16 rf s=3.6

47021fm900-1.0Ã0 RFF

wn25-1500 rf10@44RFB)-2=10ch4-16RFRFj@5c2@RF@4