What is a Circulation Pump and How Does It Work?

A circulation pump refers to a device designed to circulate liquids for processes such as reaction, absorption, separation, or regeneration within industrial or residential systems. Characterized by its low lift capacity, it primarily overcomes pressure drops in closed-loop systems. Unlike centrifugal pumps (classified by structural design), circulation pumps are defined by their functional role.

As the core component of fluid power systems, circulation pumps utilize mechanical energy to drive directional liquid flow in closed loops. They are widely applied in HVAC, industrial cooling, and district heating. According to a 2024 report by the International Hydraulic Institute (IHI), optimizing circulation pump operations can reduce building energy consumption by 12–18%, directly impacting lifecycle costs.

                                                                                     Working Principle

The working principle of circulating pump is to suck liquid into the pump body through mechanical movement, and then transport the liquid to the needed place through pressure.

Operating Steps

1.Liquid Intake:

The impeller or piston generates a low-pressure zone, drawing liquid into the pump.

2.Pressure Generation:

The rotating impeller accelerates the liquid, converting mechanical energy into kinetic energy.

3.Liquid Delivery:

Pressurized liquid is transported through pipelines to targeted systems (e.g., heating networks or cooling towers).

4.Continuous Circulation:

The pump maintains a closed-loop flow to sustain system demands, such as HVAC temperature control or industrial process stability.

Main Types

Circulation pumps are widely used in a variety of situations that require liquid circulation, especially in heating systems and industrial applications. According to their use and installation, circulating pumps are mainly divided into several types such as built-in circulating pumps, external circulating pumps and pipeline pumps.

1. Built-in circulation pumps: This type of pump is usually designed to be part of a system, such as inside a boiler or other equipment. They are usually small, easy to integrate, and tend to be used in small systems or specific equipment.