... is of spheroid and is all welded structure,Website:http://www.hugo-valve.com,which makes the valve can bear more higher pressure ... of corrosion, such as acid gas.Structure Characteristics1,fully welded construction2,design according to API 6D3,floating mounted and self ... -centering spring bearing seat 4,trunnion mounted ball type, low torque5,single piston design with self-relieving seat ...