Because of its excellent part load efficiency, many compressor unit is used mainly in the occasions for large displacement in high pressure piston compressor applications.
由于其出色的部分负荷效率，多压缩机机组主要应用于的场合为大排量中高压活塞式空压机应用领域。
2
At present, digital variable displacement axial piston pump has some problems.
目前，数字变量轴向柱塞泵还存在着很多问题。
3
This article designed a displacement setting mechanism by the fixed quantity of valve model radial column piston as base pump.