HAWE電磁換向閥是用電磁鐵的吸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。HAWE電磁換向閥有滑閥和球閥兩種結構，通常所說的HAWE電磁換向閥為滑閥結構，稱球狀或錐狀閥芯的HAWE電磁換向閥為電磁換向座閥，也稱電磁球閥。
HAWE電磁換向閥的結構種類
在液壓傳動系統中廣泛采用的是滑閥式換向閥，在這里主要介紹這種換向閥的幾種結構。 　　1.手動換向閥：手動換向閥是利用手動杠桿來改變閥芯位置實現換向的 　　2.機動換向閥：又稱行程閥,它主要用來控制液壓機械運動部件的行程，它是借助于安裝在工作臺上的擋鐵或凸輪來迫使閥芯移動，從而控制油液的流動方向。機動換向閥通常是二位的,有二通、三通、四通和五通幾種,其中二位二三通機動閥又分常閉和常開兩種。 　　3.HAWE電磁換向閥：利用電磁鐵的通、斷電而直接推動閥芯來控制油口的連通狀態。 　　4.液動換向閥 　　5.電液換向閥：由HAWE電磁換向閥和液動換向閥組合而成。 　　HAWE電磁換向閥起先導作用，它可以改變控制液流的方向，從而改變液動換向閥的位置。由于操縱液動換向閥的液壓推力可以很大，所以主閥可以做得很大，允許有較大的流量通過。這樣用較小的電磁鐵就能控制較大的液流。 　　6.比例式HAWE電磁換向閥 　　比例方向閥是以在閥芯外裝置的電磁線圈所產生的電磁力，來控制閥芯的移動，依靠控制線圈電流來控制方向閥內閥芯的位移量，故可同時控制油流動的方向和流量。
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