GB/T 12459  弯头 DN 250-Ⅱ-490EL6/70=-10RF0/RF/prqN40-63 R

DN 250-Ⅱ-4 90EL6/70=-10RF0/RF/prqN40-63 R

So40-10rff=42.50

WN 250(B)-40FM s=10wn5S=5-1.0j00-Б√0-.45Fr80FRF0RFf6b=148600rf

WN 100-150 RF S=6

BL15-150RF=19

WN50(B)-16 FM

pl25(a)-10ffb1=350.6

WN 25(B)-16 RF S=3 b=50am.5/40-1237F52/hg

DN300/PN16/12B