排量限制器是在柱塞泵中的压力阀和排量阀之间设置了一个凸轮（通常为柱塞杆）当柱塞杆处于垂直位置时，凸轮产生的扭矩驱动柱塞杆向前运动，从而将压力输送到活塞上导致活塞移动；而当柱塞杆处于水平位置时，凸轮产生的扭矩驱动柱塞杆向上运动，从而将压力输送到活塞上导致活塞移动。
这种凸轮结构上不同于调节机构或限位装置上的凸轮杆),所以这种凸轮结构上产生的扭矩没有调节机构大，不会给柱塞泵带来不必要的功率损失但是这种凸轮有一个缺点就是凸轮有一定的凸度，所以在工作中很容易造成较大摩擦系数。
因此，在发动机中一般采用排量限制器来限制凸轮与凸轮轴的相对位置关系当需要控制某一柱塞泵单位流量时，凸轮上的凸度不能大于该固定凸度的2倍，而是应该比该固定凸度高出1-2个数量级当控制柱塞泵单位流量时，凸轮上的凸度可以大于(0°/50°)2个数量级以上。
如果该限制柱塞阀控制的柱塞压力超过(1°/50°)1个数量级时，则凸轮上就应该设置排量限制器，以限制该调节式的应用寿命其作用是将凸轮固定在小活塞上 90-R-180-KA-5-CD-80-S-C-C8-J-03-NNN-42-42-24 90R180KA5CD80SCC8J03NNN424224 90R180-KA-5-CD-80-S-C-C8-J-03-NNN-42-42-30 90R180KA5CD80SCC8J03NNN424230 90-R-180-KA-5-CD-80-S-C-C8-J-03-NNN-42-42-30 90R180KA5CD80SCC8J03NNN424230 90-R-180-KA-5-CD-80-S-C-C8-J-05-FAC-38-38-24 90R180KA5CD80SCC8J05FAC383824 90R180-KA-5-CD-80-S-C-C8-J-06-NNN-36-36-24 90R180KA5CD80SCC8J06NNN363624 90-R-180-KA-5-CD-80-S-C-C8-J-06-NNN-36-36-24 90R180KA5CD80SCC8J06NNN363624 90R180-KA-5-CD-80-S-C-C8-J-09-FAC-35-35-28 90R180KA5CD80SCC8J09FAC353528 90-R-180-KA-5-CD-80-S-C-C8-J-09-FAC-35-35-28 90R180KA5CD80SCC8J09FAC353528 90R180-KA-5-CD-80-S-C-F1-H-03-FAC-35-35-24 90R180KA5CD80SCF1H03FAC353524 90-R-180-KA-5-CD-80-S-C-F1-H-03-FAC-35-35-24 90R180KA5CD80SCF1H03FAC353524 90R180-KA-5-CD-80-S-C-F1-J-00-NNN-42-42-24 90R180KA5CD80SCF1J00NNN424224 90-R-180-KA-5-CD-80-S-C-F1-J-00-NNN-42-42-24 90R180KA5CD80SCF1J00NNN424224 90R180-KA-5-CD-80-S-M-C8-H-03-FAC-26-26-24 90R180KA5CD80SMC8H03FAC262624 90-R-180-KA-5-CD-80-S-M-C8-H-03-FAC-26-26-24 90R180KA5CD80SMC8H03FAC262624 90R180-KA-5-CD-80-S-M-C8-H-03-FAC-42-42-24 90R180KA5CD80SMC8H03FAC424224 90-R-180-KA-5-CD-80-S-M-C8-H-03-FAC-42-42-24 90R180KA5CD80SMC8H03FAC424224 90R180-KA-5-CD-80-S-M-C8-H-04-NNN-42-42-24 90R180KA5CD80SMC8H04NNN424224 90-R-180-KA-5-CD-80-S-M-C8-H-04-NNN-42-42-24 90R180KA5CD80SMC8H04NNN424224 90R180-KA-5-CD-80-S-M-C8-J-03-NNN-42-42-24 90R180KA5CD80SMC8J03NNN424224 90-R-180-KA-5-CD-80-S-M-C8-J-03-NNN-42-42-24 90R180KA5CD80SMC8J03NNN424224 90R180-KA-5-CD-80-S-M-C8-J-05-NNN-32-32-28 90R180KA5CD80SMC8J05NNN323228 90-R-180-KA-5-CD-80-S-M-C8-J-05-NNN-32-32-28 90R180KA5CD80SMC8J05NNN323228 90R180-KA-5-CD-80-S-M-C8-J-05-NNN-35-35-28 90R180KA5CD80SMC8J05NNN353528 90-R-180-KA-5-CD-80-S-M-C8-J-05-NNN-35-35-28 90R180KA5CD80SMC8J05NNN353528 90R180-KA-5-CD-80-S-M-F1-H-03-NNN-35-35-24 90R180KA5CD80SMF1H03NNN353524 90-R-180-KA-5-CD-80-S-M-F1-H-03-NNN-35-35-24 90R180KA5CD80SMF1H03NNN353524 90R180-KA-5-CD-80-T-C-C8-J-00-NNN-17-17-24 90R180KA5CD80TCC8J00NNN171724 90-R-180-KA-5-CD-80-T-C-C8-J-00-NNN-17-17-24 90R180KA5CD80TCC8J00NNN171724 90R180-KA-5-CD-80-T-C-C8-J-03-NNN-29-29-24 90R180KA5CD80TCC8J03NNN292924。
