Water Pumps

Water Pumps, which are commonly known as hydraulic pumps, are used in hydraulic drive systems. Water pumps can be fixed or variable displacement pumps. There are various kinds of water pumps such as:

Gear Pumps: These are the simplest type of water pumps available.
Gerotor Pumps: These are another type of gear pump, which have internal teeth of optimized design.
Rotary Vane Pumps: They are more efficient than gear pumps. Some vane pumps can alter the center of the vane body.
Screw Pumps: These double Archimedes spiral pumps are used for high flow and low pressure. These types of pumps are used on board ships. The benefit of the screw pumps is that the sound level is low and the efficiency is good.
Bent Axis Pumps: These pumps have the best efficiency of all the pumps. These pumps can work with a working pressure of up to 350 bars.
Axial Piston Pumps Swashplate principle: Equally efficient as the bent axis model, these pumps are more compact in design. These are more convenient to use and more economical to manufacture.
Radial Piston Pumps: These are fixed displacement pumps that are used especially for high pressure and relatively small flows. The pump is designed in such a way that the plungers can be switched off one by one.
Peristaltic Pumps: These pumps are used for high pressure.

Apart from these, there are pumps for open and closed systems. In an open system, the pump draws oil from a reservoir at atmospheric pressure. For the use of multi-pump assemblies, the suction connection of the pump is often combined. In closed system, both sides of the pump can be at high pressure.

Multi pump assembly means that in a hydraulic installation, one pump can be used by more cylinders and motors. But, it is more economic to give a single pump. In that case one pump should be provided for each cylinder and motor.