keystone FIG1手动涡轮蝶阀 阀体是球墨铸铁，阀座是NBR,EPDM,阀板是316SS，类似的蝶阀有FAR1,FAR2,F001,F1000,FAR1T805,FAR1T723等，配套产品有F79U气动头，791N电磁阀，keystone NBR密封圈，k