HG/T 20592  法兰盖 BL 700-16 RF-h40 SFMrf h=21

bl700-16rf-h40 SFMrf h=21

HP-4

WN 100-150 RF

3 T 550-2.520δ0=20

pl500-40rj0RF0@RF RF16516

wn150-150rfr.5-4.0sRmf Rm

JWN 50×80-40 RF S=4

B WN 32"-150 RF B=Sch40S

PL250(B)-10RF

A BL8"-300 RF0-112 -10 RFRF Sch8040S Sch601060rfFMG250A@40@S52