The analysis and control of prism-angle error on seating faces of wedge gate valve;
楔式闸阀密封面棱角误差的分析及其控制
Replaceable packing with pressure inside screw nonrising stem type wedge gate valve;
暗杆楔式闸阀阀杆密封结构改进
Seal Structure of a New Type Wedge Gate Valve's Tow Pices;
新型楔式闸阀双闸板密封结构