... ,well seal performance knife gate valveWith GS,CE certificate Non-toxic,environmental-friendly material Customized design offered High quality ... , reinforce Graphite etc;ActuatorsHand wheelpneumaticBevel gearHydraulic cylindersOther actuators available Zhongcheng is one of the chinese leading manufacturers of industrial steel ... such as API ,ANSI,DIN BS,AND JIS . non rising stem flange knife gate valve