设计特点Design features
1、3PC锻钢、分体式、固定球
3PC Forged steel，split body,trunnion ball.
2、防吹出阀杆设计Blow-out proof stem.
3、防火、静电结构Fire-proof and Anti-static structure.
4、紧急注脂密封设计
Emergency grease seal design.
5、双阻断及排污功能（DBB）
Double block and bleed function.
标准规范Standard specification
设计标准Design:API6D
面间距离Face to Face: API 6D
法兰标准Flange:ASME B16.5
试验标准Inspection: API6D
