Fundamentals of PD pumps that you need to know

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A positive displacement pump in Sydney can be used in a wide range of applications across different industries. Users have realised that these pumps can provide solutions to specific challenges. However, because of their simplicity, size and ruggedness, they are not as well understood as other types of pumps.

Technology within the extensive PD pump family enables coverage of a wide range of horsepower, pressure and fluid application. These products merit increases in the consideration of this pump in the pump selection process.

PD versus centrifugal pumps

The impeller is a centrifugal pump that moves a stream of liquid from the suction of the pump to a discharge cone, where decreasing kinetic is converted to pressure energy. A PD pump, however, does not rely on a change of velocity. It obtains pressure as liquid and is then forced through the discharge of the pump into the system, hence converting the shaft work into pressure. Reciprocating motion is a good example of this, in which a moving piston forces fluid out of a closed cylinder through the outlet and inlet valves.

A reciprocating pump represents one form of positive displacement technology. Reciprocating pumps are the only technology that can provide the necessary pumping solution in portions of their operating range.

Rotary pumps are also a major PD pump category. In this case, the rotating pumping element in the pumping chamber moves the fluid. This pump family is differentiated by its lack of discharge or inlet valves. This positive displacement pump comes in a wide range of pumping principles.

Another major category of these pumps is the controlled volume metering pump. This type is often called a chemical-injection feed pump or a dosing pump. These are reciprocating PD pumps configured to dispense the accurate volume of liquid during a certain time period using any of the different mechanisms for varying the volumetric displacement. The pump is used where highly repeatable, accurate, and adjusted flow rates are needed.

Pumping solution products

PD pumps are often called pumping solution products. They can be used almost anywhere but the most accepted view is that more than 9 out of 10 PD pump applications are in 6 industrial markets: chemical, oil & gas, food, beverage & pharmaceutical, general industrial and power.

Most of these industries are representative of different markets. Gas and oil, have distinctly different PD pumps applications across their segments: production, exploration, pipeline, processing to distribution. The beverage and food market is another key PD market with multiple segments that include bakery, beverage, dairy, confectionary, and meat packaging.


Some applications should use PD pumps and others should make use of centrifugal pumps. It is crucial to recognise the broad range of applications in which the two types of pumps should be considered with the selection based on the desired results by the user.

It is important to remember that a positive displacement pump in Sydney might be the best pump for a specific problem. Some of the things to consider when choosing a PD pump include the pressure conditions, fluid characteristics, flow control and environmental system requirements.

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