采用倒关双密封设计，可带压更换上密封组件，整体阀盖暗杆设计，结构紧凑。
Use back seal design, can replace top seal parts under pressure. Entirety of non-rising bonnet design, have compact structure.
维修组件饱含：1件-柔性密封衬垫阀座，1件-铰柱，2件-阀瓣板，2件-阀瓣盖，1件-柱带，2件-阀座柱O形环和塑料总成螺丝。
Repair Kit Contains: 1-Flex Seal Gasket Seat, 1-Hinge Post, 2-Flapper Plates, 2-Flapper Covers, 1-Post Strip, 2-Seat Post O-Rings &Plastic Assembly Screws.
组件所有外露接口均设有防护堵、盖，且封闭良好，接口螺纹和法兰密封面无损伤；
All accessory interfaces should have protection covers with good sealing, there is no damage on the connecting screws and flange sealing surface.
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