径向柱塞泵其工作原理是通过柱塞的径向位移改变柱寒封闭容腔的大小以进行吸油与排油从而将机械能转换成液乐能。考虑到径向柱塞泵的排量必须与液压千斤顶的缸体容积相适应，并且要和气动马达工作参数相配套，经过核算确定径向二三柱塞泵的技术参数选型。径向柱塞泵配油方式是三柱塞靠与偏心轮的相互啮合，改变塞体容积的大小，完成吸油和排油，实现阀式配流盘配流。
The working principle of the radial piston pump is to change the size of the cold closed cavity of the cylinder through the radial displacement of the plunger to absorb and drain oil, so as to convert the mechanical energy into liquid energy. Considering that the displacement of the radial piston pump must be compatible with the cylinder volume of the hydraulic jack and the working parameters of the pneumatic motor, the technical parameter selection of the radial two three piston pump is determined through the calculation. The way of oil distribution of radial piston pump is to change the volume of plug body by the engagement of three plunger and eccentric wheel, to complete oil absorption and drainage, and to realize valve type distribution plate.