GB/T 12459  弯头 DN 20-Sch16090EL

DN 20-Sch160 90EL

WN300-300 RJ S=12.7RFF/rfF´=70 Sch40=7

WN 250-150 RF=/9b/u=u0ffh80592RF

DN 50×25-Sch10S RE40(0ac/1

BL 22"-1500 RF0B)-16rf0(B)-1rf24m1

S47021 C-FF900-0.690

SO150(B)-16RF(B)-6 RFRF��

SO65(B)-6 RF RF-=05 rRF s

法兰BL25