電磁換向閥是用電磁鐵的推力來推動閥芯運動以變換流體流動方向的控制閥，簡稱電磁閥。
　　電磁換向閥有滑閥和球閥兩種結構，通常所說的電磁換向閥為滑閥結構，稱球狀或錐狀閥芯的電磁換向閥為電磁換向座閥，也稱電磁球閥。
　　電磁換向閥的主要性能要求為：
　　1，換向性能
　　在規(guī)定的工作條件下，電磁閥通電后能否可靠地換向，斷電后能否可靠地復位。
　　2，壓力損失
　　電磁換向閥的壓力損失由液流流過電磁換向閥的閥口時產(chǎn)生的流動損失和節(jié)流損失組成。
　　3，內(nèi)泄露量
　　電磁換向閥的內(nèi)泄露量是指在規(guī)定的工作條件下，處于各個不同工作位置時，從高壓腔到低壓腔的泄露量。
　　4，換向和復位時間
　　從電磁鐵通電到閥芯換向終止所需要的時間，復位時間是指從電磁斷電到閥芯回復到初始位置所需要的時間。
　　5，換向頻率
　　在單位時間內(nèi)所允許的zui大換向次數(shù)
　　6，使用壽命
　　電磁閥使用到主要零部件損壞，不能進行正常的換向和復位動作，或者使用到其主要性能指標明顯惡化超過了規(guī)定指標所經(jīng)歷的換向次數(shù)。
　　電磁換向閥的品種繁多，按其工作位置數(shù)和通路數(shù)的多少可分為二位三通、二位四通、三位四通等；按其復位和定位形式可分為彈簧復位式、鋼球定位式、無復位彈簧式；按其閥體與電磁鐵的連接形式可分為法蘭連接和螺紋連接；按其所配電磁鐵的結構形式可分為干式和濕式，每一類又有交流、直流、本整等形式，而且所需電源電壓又有好多種，因而在其結構上存在很多差別。
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