HG/T 20592  法兰盖 BL 500(B)-16 RF h=60

bl 500(B)-16RF h=60

WN 1000-600 RF-=78 b=3��

BL500-40 FM

DN1000-PN6 WN RF Ⅱ S=8

WN250-16GF0 RF6 RFRs=3.

wn25-300rf а№Җаё

DN100-PN25 WN RF Ⅱ S=10

SO300-150 T)-6RRF6

BL510-600 RF010ch40s50 R

PL 65(B)-10 T RF S=2029R.J-1671@6RFrf6/;amp;quo