There are many types of hydraulic oil pumps, such as gear pumps, plunger pumps, and vane pumps, each with a different working principle. However, they all require four essential conditions: the oil tank is connected to the atmosphere, there is a sealed volume, the sealed volume can alternate, and there is an oil distribution device.

Hydraulic oil pumps feature the following characteristics:

Compact and lightweight, easy to use, and capable of high working pressure.

2. Single-stage pump station: Simple structure, capable of achieving higher working pressure.

3. Dual-stage pump station: At low pressure, both high and low-pressure pumps supply oil simultaneously, yielding a greater output flow. At high pressure, the low-pressure pump returns oil to the system without load via an automatic by-pass valve, reducing power consumption.

4. Pressure Holding Function: Under the condition of no leakage in the external oil circuit, the pump stops and maintains pressure for 5 minutes, with the rated pressure not dropping more than 5 Mpa.