... to face dimensiions adopt short series, and light weight valve is adopted, so as to save pipe supporter.2 ... During the opening and closing of the vavle, the gate disc can automaticallly scrape off the adhered medium and ... 3.The blade type gate disic helps medium cutoff anf residue discharge so that the valve can be operated withoyt ... , manual, umbreall, gear, electric Wafer rising Stem Knife Gate Valve