力士乐调速阀 Z2FRM6AB2-2X/32QRV其实就是流量控制阀  

,调速阀是进行了压力补偿的节流阀。它有定差减压阀和节流阀串联而成。节流阀前、后的压力p2和p3分别引到减压阀阀芯右、左两端，当负载压力p3增大，于是作用在减压阀芯左端的液压力增大，阀芯右移，减压口加大，压降减小，使p2也增大，从而使节流阀的压差(p2-p3)保持不变;反之亦然。这样就是调速阀的流量恒定不变(不受负载影响)。

上述调速阀是先减压后节流的结构。也可以设计成先节流后减压的结构。两者的工作原理基本相同

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