... weight and convenientto be installed and maintained2) Smooth flow path, almost zero flow resistance.3) Soft sealing seat with credible sealing ... , or with greaterviscosity, and special gaseous media such as oxygen and coal gas. SpecificationDN mmDN15-400mmPNANSI 150, 300,600,JIS10K,20k,30k ... temp.-20 ~ +250°cHigh temp. 1-30 ~ +350°cHigh temp. 2-40 ~ +400°cHigh temp. 3-60 ~ +500°cRated stroke0- 90 ...