GB/T 12459  偏心异径管 DN 300×250-3RERFhg/t20615

DN 250×300-3 RERFhg/t20615

47023FM1600-4.0/-1.0RF-16RF

WN 100(B)-16 RF S=60RFG20

3 FM500-1.6/50102-2 wn100fch1659

wn20-1500rf416019-h600HS2.5(a

WN 50-300 RF S=5.65 RF-s /

DN15-PN16 WN RF Ⅱ202h160f

pl350(a)-6RFRFRFF75 K=605 C=40 n=20 L=330

PL25(B)-