JT valve less JT refrigerator
朱 紹偉 （同済大）
Abstract:JT valve block is a basic trouble of 4K JT refrigerator. If the pressure drop of the high pressure gas flow channel of the last stage heat exchanger in a JT refrigerator is very large, JT valve can be eliminated or its opening area can be largely increased. Its advantage is that the reliability is increased because the cross area of the flow channel of the heat exchanger is much larger than that of the JT valve, and the opening area of the JT valve is also increased because most of the pressure drop is in heat exchanger.