HG/T 20592  法兰盖 BL 500-10 RF=95d3=463dn=∙=27 S=60=20��

BL 500-10 RF=95d3=463dn=∙=27 S=60=20��

BL 500-10 RF=95d3=463dn=∙=27 S=60=20��60

WN20-300RF-Sch80080sRR504rfS=4.10s-16rfrR4/=506-203/u625RF0/3. RF 内713-100

PL50(B)-40 RF41 H=466.4Sch80 S=5.5L Sch80 S=7δ0=8�

pl100(B)-16 RF S=4 n=8 b=4M