HG/T 20592  法兰盖 BL 250-10 RF b= B= c= h= l= n=n35

BL250-10RF b= B= c= h= l= n=n35

wn65-40 rf s=1/340rfs=62=105L10(B)-16 RF HG/T20592-20

PL250(B)-10 RF b=6 L=244=10 b0 rRF059=sch80sh=00

bl80-16g/wn1240sF40ch1==16m

WN 100(B)-25 T/@S760-0.6

so250-10rf20592RF5FF-

wn900(b)-16 rfs=10 b=1 S

SO 2"-150