GB/T 12459  弯头 DN 500-1390ESCH4 P(b)-10a3Ftg1/2

DN 500-13 90ESCH4 P(b)-10a3Ftg1/2

hg/@47023 rf1000-15f什n50-25rfampampampampampampamp

PL25-10 RF120540 S=2.9pa

WN 25-150 RF Sch160125-16M16r24

DN 40×40×25-4.55 CRR3 rf1000-1/R

WN50(b)-16fm1538.1=12 Both

WN80-150RF40)-16=12.25rf rf s/

SO 250(B)-40