HAWE電磁換向閥是用電磁鐵的吸力來推動閥芯運(yùn)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(jié)構(gòu)，通常所說的HAWE電磁換向閥為滑閥結(jié)構(gòu)，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(jié)構(gòu)種類
在液壓傳動系統(tǒng)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(jié)構(gòu)。 　　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(shí)現(xiàn)換向的 　　2.機(jī)動換向閥：又稱行程閥,它主要用來控制液壓機(jī)械運(yùn)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(jī)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(jī)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(tài)。 　　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(dǎo)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(chǎn)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(nèi)閥芯的位移量，故可同時(shí)控制油流動的方向和流量。
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