3 Types of Vane Pumps: Working Principles & Application

types of vane pumps

Vane pumps are a form of positive displacement pump and are extensively utilized in autos, power steering systems, and air conditioners. They are capable of managing intermediate viscosity fluids and excel at handling low viscous fluids. These pumps are also employed in the conversion of high-pressure gas to a low-pressure gas. In this latest blog post at Linquip, we are going to talk about different types of vane pumps. So, read the blog below.

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How Many Types of Vane Pumps are There?


There are mainly three types of vane pumps:

  1. Unbalanced Vane Pumps
  2. Balanced Vane Pumps
  3. Variable Displacement Vane Pumps

As mentioned earlier, vane pumps are positive displacement pumps that use vanes mounted to a rotor to increase the pressure of the flowing fluid. The vanes of the vane pumps can be variable in length or tensioned to maintain contact between the vanes and the pump wall as the vanes revolve. There are mainly three types of vane pumps, each type has its own set of benefits.


types of vane pumps
types of vane pumps

1. Unbalanced Vane Pumps:

Unbalanced vane pumps are made up of a cylindrical rotor that is offset inside a circular housing. It signifies that the centers of the cylindrical rotor and the shell do not coincide. The casing’s center and the rotor’s center are some distance apart. No leakage exists between the housing and the vane tip. Due to pressure variations between the intake and exhaust ports, a side thrust is formed on the rotor shaft. The bearing life is reduced due to the lateral force on the shaft. These types of vane pumps are known as an “imbalanced vane pumps” because of pressure fluctuations between the input and exhaust ports. There is no side force on the rotor shaft in a balanced vane pump.

types of vane pumps
types of vane pumps

2. Balanced Vane Pumps:

The balanced rotary vane pump has an elliptical casing. The elliptical casing and rotor have the same center. There isn’t any offset. These types of vane pumps are designed to be adaptable and are commonly used in mobile and industrial applications. Because these pumps have two inlets and an outlet, there is no pressure differential between the inlets and outputs. The two entrance ports are on opposing sides of the machine. Similarly, the outlet ports are on opposing sides as well. The intake and outlet port assembly balance equal and opposing thrust forces so that the rotor shaft is not subjected to lateral thrust forces. This balancing pump provides superior performance and long service life in a variety of applications. Balance vane pumps have a service life of more than 24,000 hours in industrial applications. The size of the cavity between two vanes decreases from intake to exit. The pump draws fluid in through the intake port and discharges it through the output port. The rotor is under high pressure in the exit area, and the forces in the two outlet zones are equal but opposing. As a result, there is no net load on the shaft’s bearings.

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types of vane pumps
types of vane pumps

3. Variable Displacement Vane Pumps:

Variable displacement vane pumps allow you to alter the size of the pocket; the delivery rate changes as a result of the varied sizes of the pump pocket. The vanes on these types of vane pumps do not come into direct contact with the pump housing. A ring separates the vane from the casing in this rotary vane pump. The response ring is the name given to this ring. One end of this ring is attached to the spring, while the other end is attached to the adjusting screw. The adjustment screws modify the size of the pump pocket. As the adjustment screw begins to rotate, the response ring travels up and down. The offset between the rotor center and the response ring center changes as the reaction ring swings up and down. As the offset varies, the size of the pocket changes, affecting the pump’s delivery flow rate.

types of vane pumps
types of vane pumps
types of vane pumps
types of vane pumps


A vane pump is a form of positive displacement rotary pump. It is referred to as a “vane pump” because the impact of the vanes pressurizes the fluid. Vane pumps are not designed to handle very viscous fluids. Vane pumps are good for pumping low to medium viscosity liquids, and those containing entrained gases, and may produce a smooth, low-pulsation output. There are three types of vane pumps available including unbalanced vane pumps, balanced vane pumps and variable displacement vane pumps. Unbalanced vane pumps are a sort of vane pumps that are common. Because of the pressure differential between the input and exit valves, they are known as an unbalanced vane pump. Balanced vane pumps, on the other hand, provide greater service and last longer. However, you might have more question about these pumps. Please leave your comments about the types of vane pumps by registering at Linquip. Also if you have any questions, ask our experts.

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