GB/T 12459  弯头 DN 20-Ⅱ-4.590ELch4 BB=580095/u00e5/public

WN 150(B)-16 RF=9 Sch4

47023 fm450-6.4/60-

pl450(b-25rf20-=6+ch0040��12

47021 RF300-1.0/231s.6F100

SO 40-150 RF

47021 RF800-1.0J500-12Srf16 RF S=3.5-6 RF1245(B)-61.6δ1

47023 rf600-2.5 δ=45 h=11

3 RF 600-2.5 δ0=12

WN 150-300 FM S=10

47023 FM800