REXROTH疊加式減壓閥上的摩擦力和液動力較大，此時電磁換向閥的電磁石推力相對地太小，需要用電液換向閥來代替電磁換向閥。電液換向閥是由電磁滑閥和液動滑閥組合而成。電磁滑閥起先導作用，它可以轉(zhuǎn)變控制液流的方向，從而轉(zhuǎn)變液動滑閥閥芯的位置。由于把持液動滑閥的液壓推力可以很大，所以主閥芯的尺寸可以做得很大，許可有較大的油液流量通過。這樣用較小的電磁石就能控制較大的液流。

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