作用在减压阀芯上端的液压力增大，阀芯下移，减压口xr加大，压降减小，使pm也增大；反之，当负载压力p2减小时，作用在减压阀芯上端的液压力也减小，阀芯上移，减压口xr减小，压降增加，使pm减小。亦即pm随负载压力p2的增大而增大，随p2的减小而大小逐渐变化，从而控制流量。这个最基本的结构是节流式调速阀，如果把负载压力引到阀芯另一端，与电磁铁平衡作用，就是溢流式调速阀。
KBFDG5V-8-33C375N-X-M2-PE7-H1-10
KBFDG5V-8-2C375N-X-M2-PE7-H1-10
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具体型号如下：
T6E-042-1R00-C1、T6E-045-1R00-C1、T6E-050-1R00-C1
T6E-052-1R00-C1、T6E-062-1R00-C1、T6E-066-1R00-C1
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