NB/T 47022  法兰 FF 300-1.6/20δ1=20

2 FF 300-1.620δ1=20

BL250-150RF30016S rf s0F T RF Sch400S

WN 4"-150 RF Sch20Sh40 B=241.560-

WN 20(B)-16 RF S=5h160h1005150RF SCRF D

BL 50-300 RF6 TSch40S206=920d=m b/0

PL500(B)-6 RF-6 RFRFRF5 RF605 RFRF00 FMRFRFch/

WN 50(B)-16 RF S=8B

LWN20-300