１引言近年来，随着能源供应的紧张，凝结水回收作为蒸汽供热系统的重要节能措施引起了广泛的重视。为了克服开放式回收系统的闪蒸热损失较大、回收温度低和管网腐蚀严重等弊病，密闭式回收系统获得了很大发展。特别是疏水阀性能质量大为提高和高温凝结水回收装置研制成功... 1 Introduction In recent years, as the energy supply is tense, condensate recovery has drawn extensive attention as an important energy-saving measure for steam heating systems. In order to overcome the shortcomings of the open recovery system, such as large heat loss of flash heat, low recovery temperature and serious corrosion of the pipe network, the closed recovery system has gained great development. In particular, greatly improve the performance and quality of traps and high temperature condensate recovery device developed ...