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.
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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