GB/T 12459  弯头 DN 50-Ⅱ-390ESFF Sc

DN 50-Ⅱ-3 90ESFF Sc

法兰 SO125(A)-16RF

WN400-900RF8F0.6u00S500-6 R

PL40 -16 rfF1

BL450(B)-16 RF500 RF

PL450-10 FF0s--150 rf550S

BL50-900FM50-10RF8-101b wn1000-150 rf Hr=4F S=10 H12-140M.7.5F C

PL450(B)-16 fF BB=386TRRF6 RF47192-1

BL50-300 RF d=