avk双法兰蝶阀介绍：

avk双法兰蝶阀，中线型活动内衬，pn 10/16

epdm橡胶内衬，aisi420阀杆，aisi304碟板，no sealing box mounted

型号: 813/83-001 - 中线蝶阀，符合en 593，短系列13，球墨铸铁，双法兰，不锈钢碟板 .

concentric butterfly valve, double flanged, loose liner. face to face dimensions: en 558-2, series 13 (din 3202 f16). design to en 593, drilling to en 1092. body: ggg-40 
top flange: iso 5211 
disc:aisi 304 
bush:bronze 
coating: electrostatically applied epoxy 
resin - internally【敏感词】externally 
avk butterfly valves, series 813 are of the concentric type with the shaft placed in both centerlines,【敏感词】the valve closing a few degrees before 0. equal areas of the disc are thus working with【敏感词】against the flow,【敏感词】the flow will not influence the opening【敏感词】closing torque.