Inline Axial Piston Pump
The quality of the axial piston pump is almost the same as that of the bending axle model. They have the advantage of being more compact in design and allow for the use of a “full drive” series of auxiliary rotating devices based on on-line design. Pumps are easier to manufacture and more economical; the disadvantage is that they are more sensitive to oil pollution. Axial piston pumps are probably the most widely used variable displacement type and can be used in a variety of applications from heavy industry to mobile applications. By using different compensation techniques, the variable displacement types of these pumps can continuously change the liquid discharge per revolution and system pressure according to load requirements, maximum pressure cut-off settings, horsepower control, etc. Even the fully proportional system does not require inputs other than electrical signals.
Radial Piston Pump
Radial piston pumps are especially suitable for high pressure and relatively small flow. The pressure of up to 650 bar is normal. In fact, variable displacement is possible. The pump is designed to connect the piston to the floating ring. The floating ring can be moved horizontally through the control rod, and thus causes eccentricity in the rotating center of the plunger. The eccentricity can be controlled to change the discharge. By shifting the eccentricity to the other side, the suction and discharge can be completely reversed. Therefore, the quantity and direction of the radial piston pump can be changed, just like the swash plate pump.
Most pumps work in open systems. The pump extracts oil from the reservoir under atmospheric pressure. No cavitation is important in the suction side of the pump. For this reason, the connecting diameter of the suction side of the pump is larger than that of the pressure side. In the case of multi pump assembly, suction connection of pumps is usually combined.
Under the closed system, both sides of the pump can be in a high pressure state. The tank is usually pressurized by 6-20 bar pressurization. For closed loop systems, axial piston pumps are usually used. Because both sides are pressurized, the pump body needs a separate leakage connection.
Multi Pump Assembly
In hydraulic installation, a pump can provide multiple cylinders and motors. However, in this case, the constant pressure system is needed, and the system always needs full power. Different chambers are mounted in a main body or installed together. Vane pumps and gear pumps can also be used as multi pumps. The screw pump can be combined with the gear pump or vane pump. The axial piston swashplate pump can be combined with second pumps or one or more gear pumps or vane pumps. The axial piston pump with bent axle can not be used in combination with other pumps.