China Hydraulic Pump Company & Zhejiang Yongling Hydraulic Machine Co , Ltd . explain the types of common    Hydraulic Pumps  :

 1. According to whether the flow rate can be adjusted, it can be divided into: variable pump and fixed displacement pump.
    The output flow that can be adjusted according to needs is called a variable pump, and the flow that can not be adjusted is called a fixed displacement pump.
2. According to the common pump structure in the hydraulic system, it is divided into three types: gear pump, vane pump and plunger pump.
Gear pump: Smaller size, simpler structure, less strict requirements for oil cleanliness, and cheaper price; but the pump shaft is subject to unbalanced force, severe wear, and large leakage.
Vane pump: Divided into double acting vane pump and single acting vane pump. The pump has uniform flow, stable operation, low noise, higher operating pressure and volumetric efficiency than a gear pump, and a more complex structure than a gear pump.
 Plunger pump: high volumetric efficiency, small leakage, can work under high pressure, mostly used in high-power hydraulic systems; but complex structure, high requirements for materials and processing accuracy, expensive, and high oil cleanliness requirements.
 Generally, the plunger pump is used when the gear pump and vane pump cannot meet the requirements. There are some other forms of hydraulic pumps, such as screw pumps, but the applications are not as common as the three above.

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