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A Liquid Ring Vacuum Pump VS A Centrifugal Pump: What are Differences


Pumps are the unsung heroes of various industrial and commercial processes, serving as the lifeblood of countless systems. Among the diverse array of pumps, two frequently utilized types are the liquid ring vacuum pump and the centrifugal pump. While both have a pivotal role in fluid handling, their applications and underlying mechanisms set them apart.

In this article, we will delve deeper into the characteristics and applications of liquid ring vacuum pumps and centrifugal pumps, providing a comprehensive view of the distinctions between these vital devices.

What is Liquid Ring Vacuum Pump?

A liquid ring vacuum pump is a dynamic apparatus designed to create a vacuum by removing gases from a closed system. This innovative pump operates based on the principle of establishing a rotating liquid ring within the pump casing. The chosen liquid, typically water or a compatible alternative, not only serves as the sealing medium but also plays an active role in gas compression.

liquid ring vacuum pump suppliers china

Liquid Ring Vacuum Pump Suppliers China

Key Features of a Liquid Ring Vacuum Pump

The liquid ring vacuum pump has some key features that the centrifugal pump doesn't has.

●Liquid Seal: The hallmark feature of the liquid ring vacuum pump is its use of a rotating liquid ring to create an airtight seal between the impeller and the casing. This liquid ring serves as both a sealing and working medium, ensuring no air ingress occurs within the system.

Low Maintenance: Liquid ring vacuum pumps are celebrated for their sturdy construction, with minimal wear and tear attributed to the absence of contact between rotating components. Consequently, these pumps are renowned for their low maintenance requirements and long operational lifespans.

Moisture Handling: Liquid ring vacuum pumps are exceptional at handling wet or saturated gases and can even cope with small amounts of liquid carryover, making them an ideal choice for applications where the process fluid is laden with moisture.

Limited Vacuum Levels: Although liquid ring vacuum pumps are robust and reliable, they are typically employed for applications that do not necessitate extremely high vacuum levels. Their performance has its limitations when it comes to achieving deep vacuum levels.

What is A Centrifugal Pump?

In contrast, the centrifugal pump is primarily a liquid-moving device, proficient in transporting fluids from one location to another. This pump harnesses the power of centrifugal force, using a rotating impeller to bestow energy to the fluid, which is then expelled through the pump's outlet.

KENFLO centrifugal pump

KENFLO Centrifugal Pump

Key Features of a Centrifugal Pump

In this section, the author will list some unique key features of the centrifugal pump.

Liquid Transportation: Centrifugal pumps excel in the realm of liquid transport, making them the go-to choice for moving substantial volumes of liquids from point A to point B. These pumps are widely utilized in applications such as water supply, sewage systems, and a multitude of industrial processes.

High Efficiency: Centrifugal pumps are celebrated for their high efficiency in liquid transport. Their streamlined design and minimal internal contact result in less friction and energy loss during operation.

Limited Gas Handling: Unlike liquid ring vacuum pumps, centrifugal pumps are not intended to handle gases. They are specialized for liquid transport applications and are not designed to create a vacuum within a closed system.

Pressure Generation: Centrifugal pumps are champions at generating high pressure within a fluid, which makes them ideal for pressurizing water or other liquids for various purposes.


Choosing between a liquid ring vacuum pump and a centrifugal pump is a decision contingent on the specific application requirements.

Liquid Ring Vacuum Pump Applications Centrifugal Pump Applications
Evacuation of gases in vacuum distillation processes. Ensuring the continuous water supply and
distribution in municipalities, ensuring
communities have access to clean water.
Handling wet or saturated gases in chemical
and pharmaceutical industries.
Supporting irrigation and agricultural systems,
facilitating efficient crop growth and cultivation.
Deaeration in food processing, preventing spoilage
 and preserving quality.
Facilitating the transportation of chemicals and
 petrochemicals within industrial settings.
Primarily used in applications that necessitate
 the creation of a vacuum within a closed system.
Regulating HVAC systems in buildings,
contributing to temperature control and comfort for occupants.


In essence, while both liquid ring vacuum pumps and centrifugal pumps contribute significantly to a myriad of industries, they are engineered for entirely different functions. Liquid ring vacuum pumps are adept at creating a vacuum by evacuating gases and are especially suited for applications that require moisture and gas removal. In contrast, centrifugal pumps are tailored for the task of liquid transportation, excelling in their capacity to move substantial liquid volumes efficiently.