HG/T 20592  法兰盖 BL 450(B)-6 FF5B10-1.6/rfB=42 Y

BL450(B)-6fF5B10-1.6/rfB=42 Y

PL32(B)-16RFF4020-1r=jmxinv

PL50(b)-16g- RF

WN 250(B)-40 FMRF.-1sc0u004

WN100-16 RF＝11M450US316L-300

WN300(B)-63 RF S

WN450-900rj84-42ff00 r0c/hp58)-

20592WN150-40RFh406-0.600

WN25B-16 RF S=5/000

3 RF 2200-0.620δh40=2