Type HY41W lift check valve H41W 型升降式止回阀 Type HY41W lift check valve HY41W 型升降式止回阀 An instruction manual 使用说明书 Type HY41W lift check valve H41W 型升降式止回阀 Lift check valve for use 升降式止回阀使用说明 1. Purpose and performance specifications 用途和性能规范 : The valve is used for industry pipeline for preventing medium countercurrent device 本阀门用于工业管道上作阻止介质逆流的装置 。 Performance specification 性能规范 Type 型 号 Tes