... During the opening and closing of the vavle, the gate disc can automaticallly scrape off the adhered medium and ... is beneficial to sealing.3.The blade type gate disic helps medium cutoff anf residue discharge so that ... temperature: -29~+245°CConnecting flange: ANSI B16.5, GB/T9113, JB/T79, HG, SH, JIS, DIN, NF, BSMain materials: ... , manual, umbreall, gear, electric Wafer rising Stem Knife Gate Valve