闸阀，截止阀，角阀和止回阀型号编制体系。
介绍了新型止回阀的防水锤结构特性和装配方法。
Introducing the structure characteristic with resistance hammer and assembly method of new type check valve.
介绍了差压式截止止回阀的结构、性能和设计要点。
To introduce the structure, performance and design of the differential stop check valve.
介绍了差压式截止止回阀的结构、性能和设计要点。
To introduce the structure, performance and design of the differential stop check valve.
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