按用途分为单向阀和换向阀。单向阀:只允许流体在管道中单向接通,反向即切断。换向阀:改变不同管路间的通、断关系。根据阀芯在阀体中的工作位置数分两位、三位等根据所控制的通道数分两通、三通、四通、五通等根据阀芯驱动方式分手动,机动,电动,液动等。图2为三位四通换向阀的工作原理。P为供油口,O为回油口,A、B是通向执行元件的输出口。当阀芯处於中位时,全部油口切断,执行元件不动当阀芯移到右位时,P与A通,B与O通当阀芯移到左位时,P与B通,A与O通。这样,执行元件就能作正、反向运动。
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