疏水閥，又稱蒸汽疏水器或阻汽排水閥，是蒸汽供熱系統中一種關鍵的自動閥門裝置，其主要作用是在保證蒸汽系統高效運行的同時，自動排除系統中的冷凝水、空氣及其他不凝性氣體，而不會讓蒸汽泄漏，從而實現節能降耗、保障設備安全與提高熱能利用效率。

　　A steam trap, also known as a steam trap or steam blocking drain valve, is a key automatic valve device in steam heating systems. Its main function is to ensure efficient operation of the steam system while automatically removing condensed water, air, and other non condensable gases from the system, without allowing steam to leak, thereby achieving energy conservation, reducing consumption, ensuring equipment safety, and improving thermal energy utilization efficiency.

　　在蒸汽輸送和使用過程中，由于管道散熱或設備換熱，部分蒸汽會冷卻凝結成水，形成冷凝水。如果這些冷凝水不能及時排出，將積聚在管道或設備中，造成“水擊"現象，即高速流動的蒸汽推動積存的水團，產生強烈震動和噪音，嚴重時可導致管道破烈或設備損壞。此外，冷凝水還會影響換熱效率，降低生產效率。

　　During steam transportation and use, due to pipeline heat dissipation or equipment heat exchange, some steam will cool and condense into water, forming condensate. If these condensed water cannot be discharged in a timely manner, they will accumulate in pipelines or equipment, causing the phenomenon of "water hammer", where high-speed flowing steam pushes the accumulated water masses, producing strong vibrations and noise. In severe cases, it can cause pipeline rupture or equipment damage. In addition, condensed water can also affect heat transfer efficiency and reduce production efficiency.

　　疏水閥正是為解決這一問題而設。它能靈敏識別蒸汽與冷凝水的區別，當系統中產生冷凝水時，閥門自動開啟排水;當蒸汽到達時，閥門則自動關閉，防止蒸汽流失。不同類型的疏水閥(如機械型、熱靜力型、熱動力型)利用浮力、溫度差或流體動力原理實現這一功能，適用于不同的工況環境.

　　The drain valve is designed to solve this problem. It can sensitively identify the difference between steam and condensate, and when condensate is generated in the system, the valve automatically opens for drainage; When steam arrives, the valve automatically closes to prevent steam loss. Different types of steam traps (such as mechanical, thermo static, and thermo dynamic) utilize buoyancy, temperature differences, or fluid dynamics principles to achieve this function, and are suitable for different working environments

　　除了排水除水擊，疏水閥還能排出系統啟動時積聚的空氣和不凝性氣體。這些氣體附著在換熱表面，會形成隔熱層顯著降低傳熱效率。疏水閥的正常工作，有助于加快系統升溫，提升運行穩定性。

　　In addition to drainage and water hammer removal, the drain valve can also discharge the accumulated air and non condensable gases during system startup. These gases adhere to the heat exchange surface, forming an insulation layer that significantly reduces heat transfer efficiency. The normal operation of the drain valve helps to accelerate system heating and improve operational stability.

　　總之，疏水閥雖小，卻在蒸汽系統中扮演著“守門人"的角色。其性能好壞直接影響能源消耗、設備壽命和系統安全性。合理選型、正確安裝與定期維護疏水閥，是實現工業節能與安全生產的重要保障。

　　In short, although the drain valve is small, it plays the role of a "gatekeeper" in the steam system. Its performance directly affects energy consumption, equipment life, and system safety. Reasonable selection, correct installation, and regular maintenance of drain valves are important guarantees for achieving industrial energy conservation and safe production.

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