How a Rotary Vane Pump Works

How a Rotary Vane Pump Works

Are you interested in learning more about a rotary vane pump?

Perhaps you want to learn a bit more about these specific pumps before buying one for a home or business project. It’s a good idea to get to know these mechanisms since rotary vane pumps are effective and reliable.


A few other names for this pump include rotary pumps and needle pumps. They move liquids, gases, and even powdered materials.

We’ll break down how these pumps work so that you have a better understanding of these mechanisms. Keep on reading.

The Motor Turns the Rotor

The motor is the main part of a rotary vane pump system and handles turning the rotor. A rotary vane pump consists of a rotor, some vanes, and a stator, which are enclosed in the pump housing. The rotor is essentially a wheel-shaped shaft composed of two curved parts that fit together.

Vanes Move In and Out

This is a practice on how a rotary vacuum pump works. When the motor turns, it causes the slanted vanes to move eccentrically. This causes a volume of fluid within the pump chamber and then pushed out at the other end by the pressure of the vanes.

The design of vanes is to have variable gap sizes and asymmetrical shapes to control the rate of flow depending on what the user needs. As their eccentric movement is part of their design, the vanes are the main component of a rotary vane pump.

Fluid Into the Low-Pressure Area of the Chamber

As the rotor turns, it traps some of the fluid between the rotor blades, pushing it through the slots. As the rotor continues to turn, it pumps the fluid into the low-pressure area of the chamber, creating a vacuum that remains until the rotor stops turning.

As the vacuum increases, additional fluid is drawn from the inlet and forced into the system. Rotary vane pumps are lightweight, reliable, and efficient solutions for many industrial applications.

Rotation Continues Creating Suction

As the rotor continues to rotate, the vanes push outwards from the rotation, sweep the fluid in the pockets out of the pump and the suction is created once again. This process continues as the rotor continues to turn, creating a continuous suction that draws in the fluid.

And if you’re considering buying one today, welch vacuum pumps offer a range of types of pumps, sizes, and features to ensure you are getting the best pump for your needs. They offer services, technical support, and accessories to ensure a trouble-free purchase and operation of the pump.

Invest in a Rotary Vane Pump


Investing in a rotary vane pump is a smart move if you’re looking for a durable, quality pump system. They are cost-effective, have a long service life, and are easy to maintain and install.

It is a great decision for your business or home. Invest in one today and start enjoying the quality and performance!

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