Tianjin Exxon Valve Co.,Ltd, with professional factory, is one of the leading China ansi ... Port Design, OS&Y, Outside and Screw, Bolted bonnet, Back Seal StructureFlexible wedge, Fully guided, Choice of Solid or Split wedgeRenewable ... design for low temperatureFlanged or Butt-welding endsStandard:Design And Manufacture: API 600, API 6D, BS1414,EtcFace To Face (End To ...