HG/T 20592  法兰盖 BL 50(B)-10 RF SCH50-4.0/b)1=2

BL50(B)-10RF SCH50-4.0/b)1=2

LWN125-150RFb=1H=238

BL 4"-300 LT��RF6f65/daSch40Sn=66RB0/u00c30ch

WN 3"-400 RF SchFNrfFf f=6c3/u0083/u00c.=8F00HForFsplborum@ï؟½S

SO 6"-150 RFB) ุฎยด=1

BL 250-16 RFžâ„076 RFX=YF

bl300-2.