... globe, plug, butterfly, safety, oil field and other special valves that are applied broadly in petroleum,chemical,metallurgical and power ... gate, plug, butterfly, safety, oil field and other special valves. Among 35% and 30% in total output by ball valve ... PNS 1/2~NPS80Operation type: manual, gearbox, chain wheel, pneumatic,electronic,hydraulic-pneumatic etc.Connection End:flanged, BW, SW, NPT, water ...