How to Choose the Type of Hydraulic Pump?

We should determine the type of hydraulic pump according to the type and working conditions of the main engine, the power size and the performance requirements of the system, and also consider the quantitative or variable, prime mover type, rotational speed, volumetric efficiency, total efficiency, and self-priming capacity, noise and other factors.

1. Dosing pump or variable pump?

Whether to use a quantitative pump or a variable pump needs to be carefully demonstrated. Quantitative pumps are simple and cheap, while variable pumps are complex and expensive, but can save energy. The application of fixed pump and variable pump is different. Vane pumps, axial piston pumps and radial piston pumps have fixed pumps as well as variable pumps. The variable mechanism of variable displacement pump (especially axial variable displacement piston pump) has many forms. Elephant Fluid Power provides pump parets in many forms.

2. Control method of hydraulic pump

The control methods include manual control, internal pressure control, external pressure control, solenoid valve control, sequence valve control, electromagnetic proportional valve control, servo valve control, etc. The control results include proportional variables, constant pressure variables, constant current variables, constant torque variables, constant power variables, and load sensing variables. Not all variable displacement pumps have the various variables and control methods described above. The selection of variable methods should meet the requirements of the system, and the static and dynamic characteristics and usage methods of these variable methods should be clarified in actual use. Different types of pumps and different manufacturers have different characteristics of the variable mechanism. When choosing, you should carefully check the product samples or instruction manuals.

3. Diversity of hydraulic pumps
         

The hydraulic pumps can also be made into several pumps ( which can be the same type of hydraulic pump or different types of pumps ) in parallel, and use a multi-stage pump with the same drive shaft, or can be made into a multi-stage pump with a series of oil circuits. When the flow rate of the hydraulic system varies greatly within a working cycle, a multi-connected pump can be selected. Multi-connected pumps usually have one oil suction port and multiple oil pressure ports. The pressure oil of each oil pressure port can supply oil to different actuators of the system separately, or can be combined to supply a certain actuator.

4. Additional requirements for hydraulic pumps     

When choosing the form and structure of the hydraulic pump, other requirements of the system for the hydraulic pump should also be considered , such as weight, price, service life and reliability, the installation method of the hydraulic pump, the driving method of the pump and the connection method between the pump and the prime mover, the shaft extension form of the pump ( cylindrical, conical shaft extension with external thread and involute spline, etc.), whether it can withstand a certain radial load, the connection form of the oil port (thread, flange), etc.
 

The choice of hydraulic pump type determines the future work efficiency. Therefore, when determining a specific model and want to implement the purchase behavior, you must choose the correct hydraulic pump agent, but do not choose the model but buy the wrong product or buy inferior products, this situation is quite annoying no matter who it happens to.