柱塞泵密封性好，能提供较大的压力，一般被用在高压25-40MPa场合。像齿轮泵，断面泄漏严重，排量小，限制了他输出流量，也限制了他输出压力的提高。
Plunger pump has good sealing performance and can provide greater pressure. It is generally used in high-pressure situations of 25-40 MPa. Like gear pump, the leakage of cross section is serious and the displacement is small, which limits its output flow and the increase of its output pressure.
轴向柱塞泵内部的配合都是采用的面接触，缸体与配流盘，滑履与斜盘之间都是面接触，在高压时，它们之间摩擦增大造成磨损会，间隙会自动补偿，不会造成泄漏，此外，轴承不承受液压径向力，寿命大，所以压力得到提高。
The internal coordination of the axial piston pump is surface contact. The cylinder block and the valve plate, the sliding track and the swashplate are surface contact. At high pressure, the friction between them will increase, which will cause wear and tear, and the clearance will automatically compensate, which will not cause leakage. In addition, the bearing does not withstand the hydraulic radial force and has a long life, so the pressure will be increased.