GB/T 12459  弯头 DN 400-490EL K===F Sch40S400-

DN 400-4 90EL K===F Sch40S400-

SO 600-150 FF=16.1ch-4

WN 150-150 RF sch80

WN 15-300 M S=2.7

WN250-150 RF Sch40

BL 4"-300 RF

WN65(b)-25RF.1F)-11.0

pl350-10ff،��â³

SO 10"-150 FF

BL 6"-300 RF5340RF@443o025S5 RJ RFSc����hSc�