... goal of these two eccentrics is to reduce the friction between seat and sealingsurface. The third eccentric “c” is an eccentric angle ... β, which uses the cam effect to realize theno-friction contact between seat and sealing ring of disc during the 90° travel of ... with the smallest torque.SpecificationDN mmDN80-2400mmPNANSI 150, 300,600,JIS10K,20k,30k,40kMaterial of parts Body WCB,CF8,CF8M,316L ...