換向閥主要包括電磁換向閥，手動換向閥，電液換向閥，四通換向閥，多路換向閥，氣控換向閥，五聯多路換向閥，二位二通換向閥等。手動換向閥是用手動杠桿操縱閥芯移位的方向控制閥。在液壓系統中，它可控制油流方向，以改變執行元件的運動方向。手動換向閥的滑閥換向定位方式有鋼球定位式和彈簧復位式二種結構。鋼球定位式是當操縱手柄外力取消后，閥芯依靠鋼球定位保持在換向位置。彈簧復位式是當操縱手柄外力取消后，彈簧使閥芯自動回復到初始位置。電磁換向閥是通過電氣信號來改變液流方向的控制閥門，它可用來實現液壓系統的卸載，順序動作及油路換向。電磁換向閥主要用于工程機械、礦山機械、起重運輸機械以及其它機械的液壓系統中。

　　direction change valve include electromagnetic direction change valve, manual direction change valve, call liquid direction change valve, four way direction change valve, multiplexed direction change valve, gas control direction change valve, five of multiplexed direction change valve, two spaces, such as two-direction change valve

　　Manual is a manual lever manipulation direction change valve disc killer direction control valves. In the hydraulic system, it can control the oil flow direction, the implementation of components of the Movement to change direction. Manual direction change valve the slide-valve for a way to the positioning of spaces steel ball positioning-and-two types of spring-loaded structure. steel ball positioning of manipulation handle external forces when lifting, positioning steel ball disc rely on to maintain in-place. When the manipulation of spaces is a spring-loaded handle external forces cancellation, disc spring-loaded to automatically revert to the initial position. direction change valve electromagnetic signals through electrical control valves to change the direction of liquid flow, it can be used to achieve hydraulic unloading system, the order to move and change oil flow. Electromagnetic direction change valve mainly for engineering machinery, mining machinery, transport machinery and other mechanical lifting hydraulic system