Between power, noise, maximum pressure and other factors, choosing a hydraulic pump involves many different considerations. You must consider your needs and how to operate the pump. Here are some features you should consider when purchasing features:

1. Hydraulic oil viscosity
Fluid viscosity refers to the thickness of the liquid in the pump. The viscosity of the fluid affects the performance of a given hydraulic pump and which hydraulic pump should be used. Most pumps have a maximum kinematic viscosity rating associated with them, so stick to this number. Fluids with too low viscosity limit the efficiency of the pump and increase wear. Fluids that are too viscous can also reduce efficiency and cause mechanical problems.

2. Fluid type
The fluid used in the hydraulic system should also meet the pump specifications. Most pumps work well with standard hydraulic oil (usually based on mineral oil). It has inherent good lubricating properties and has a higher boiling point than water. You may need other types of fluids for specific applications, including:

Biodegradable: Many environmentally sensitive applications use biodegradable hydraulic oil to reduce the risk of leakage. These liquids include liquids extracted from vegetables, such as soybean, sunflower, and rapeseed oil. Although they do oxidize quickly and may be contaminated by water, they generally have high lubricity and inherent corrosion resistance. There are several other types of biodegradable liquids that can solve some of these problems, but they may have more specific requirements for the system. Agricultural equipment and maritime work are examples of jobs that may require biodegradable liquids.

Phosphate ester: This synthetic oil has high thermal stability, lubricity and anti-wear properties. Its main use is in high temperature applications where there is a fire hazard. Between higher ignition temperature, minimal oxidation and lower combustion heat, phosphate esters are difficult to burn and can even self-extinguish. However, they are less viscous and may be chemically aggressive on certain seals and coatings. The maintenance cost of such a system can be high.

Water glycol: In the application that needs to be solved, water glycol liquid is another refractory choice. Water glycol consists of water, high molecular weight polyethylene glycol, ethylene glycol or diethylene glycol and an additive package. Usually 38-45% water. Additives can provide properties such as corrosion resistance, oxidation resistance and wear resistance.

These hydraulic oils are not interchangeable for every pump, so finding the hydraulic oil that suits your hydraulic oil needs is critical to choosing the best industrial hydraulic pump for your operation.

3. Flow
The flow rate is calculated as follows:

Pump speed, revolutions per minute (RPM)
Pump efficiency percentage
Displacement value
The maximum rated flow of pumps is usually gallons per minute or liters per minute. It tells you how much they can move and may determine their ability to meet your needs.

4. Power curve/torque rating
When looking at the power of a pump, we combine torque and speed. Torque is a key component in determining power requirements. The easiest way to select the required torque is to compare a new machine with an existing machine performing similar tasks. Consider how much work the new machine needs to do and multiply it by the rated torque of the old machine. If there is no old machine, the torque must be calculated

The power curve can visually show how other specifications affect the power, thereby helping you choose the right pump. It shows how much power the pump needs at a specific flow rate.

Remember, gasoline engines are different from electric motors due to the torque-speed curve of internal combustion engines. Compared with gasoline engines, hydraulic pumps running on gasoline engines require higher power capacity.

5. Speed
The running speed focuses on the number of revolutions per minute of the drive shaft. Different designs may provide higher or lower operating speeds.

6. Maximum working pressure
Pumps usually have a maximum working pressure listed in bar or pressure per square inch (PSI). Remember that the pump does not generate pressure. Any pressure is generated by the load on the fluid. The load on the fluid is shown as the pressure on the outlet, which is the maximum pressure of the pump. This rating determines the location where the pump can effectively withstand pressure without leaking or damaging parts. In different pump designs, the maximum working pressure may vary greatly.

7. Fixed displacement and. Variable displacement
There are multiple types of hydraulic pumps in fixed displacement and variable displacement configurations. These models have different amounts of replacement fluid.

For the fixed displacement model, each cycle causes the same amount of fluid to be moved.

Variable displacement pumps are slightly more complicated, but can change factors such as flow rate and outlet pressure.
Variable displacement pumps are suitable for a variety of tools and projects, but fixed displacement pumps work well in applications that perform the same task repeatedly.

8. Repair time and cost
When buying a new hydraulic pump, you also need to consider maintenance factors. Some maintenance costs are higher than others, and maintaining maintenance levels can help you extend the life of the pump and improve its performance.

Variable displacement pumps are generally expensive to maintain due to their complexity. Some pump design features make it more prone to wear. For example, vane pumps are very reliable because if the casing starts to wear, the vanes will simply extend the required number. External gear pumps are also very durable, but internal gear pumps are expensive. The installation of axial and curved shaft piston pumps is more complicated, but the service life is longer.

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