A Positive Displacement Pump uses a simple operating principle whereby a set amount of fluid is trapped within the pumps chamber using closed valves or seals for it to then be pushed through and moved to the discharge side pipe. A constant flow is maintained during the pump operation and at a fixed speed, regardless of changes in pressure.
They are one of the most common types of process pump systems on the market and a lot of popular pump ranges fall within the positive displacement pump category.
It’s important to note that there are two main types of positive displacement pumps, reciprocating and rotary. A reciprocating positive displacement pump works by making repetitive alternating strokes creating a vacuum inside the pump enabling fluid to push through to the discharge side.
A Rotary Positive Displacement Pump uses a rotating gear system to create a vacuum that enables a fixed amount of fluid to pass through the pump cavity and through to the discharge side. There are four different types of rotary positive displacement pumps known as Internal Gear, External Gear, Vane and Rotary Lobe. Take a look below at the common positive displacement pump types to find out which one falls into which category.
Centrifugal pumps are a popular pump range but they are not classified as positive displacement pumps. This is due to them featuring one or more impellers to move fluid through the pump, thus creating a centrifugal force that draws fluid out to the discharge side.
To find out more about centrifugal pumps, take a look at our helpful Centrifugal Pump guide.
There is often a debate as to whether you should use a Positive Displacement Pump or a Centrifugal Pump, however, both have their strengths and weaknesses depending on your application.
Take a look below at some applications where a positive displacement pump would be recommended and where a centrifugal pump would be recommended.
If you’re unsure whether a Centrifugal Pump or a Positive Displacement Pump would suit your application better, then get in touch with the Sales Team today, we’d be happy to talk you through your options.
E = Excellent, G = Good, A = Average, P = Poor
|Abrasives||Thin Liquids||Viscous||Solids||Dry Prime||Different Pressure|
Tapflo UK are proud to supply a wide range of positive displacement pumps for a variety of pump executions including Diaphragm Pumps, Lobe Pumps, Screw Pumps, Flexible Impeller Pumps and many more! Take a look at some of our range below and what they have to offer!
Our Diaphragm Pumps are air operated, they have 2 diaphragms inside, 1 diaphragm creates a vacuum to draw fluid into the pump whilst the other forces fluid out of the discharge port.
Swap to Tapflo Diaphragm Pumps today! Not so sure? Here are 7 signs you should swap to a Tapflo Diaphragm Pump!
Lobe Pumps are versatile pumps designed for sanitary applications. The pump is operated by two rotating lobes that create a suction to draw more fluid into the pump, creating a pressure that causes a predetermined amount to flow out of the pump’s discharge port.
For additional information visit our Quick Guide to Pomac’s Sanitary Lobe Pump.
The Twin Screw Pump has been designed to combine all the benefits of a Lobe, Peristaltic, Centrifugal and Circumferential Piston pumps. We supply Screw Pumps with double screws, which rotate to move fluid forward through the pump casing.
Also known as a Flexible Impeller Pump, these pumps push liquid forwards within the pump by trapping fluid between each vane of the impeller.
Click here for more information on the benefits of using a Flexible Impeller Pump
A Peristaltic Pump is a versatile pump that is easily maintained due to the main wear in the pump only affecting the hose. The pump creates a pulsating flow created by shoes or rollers on the wall of the hose to push fluid along the hose.
A Gear Pump is a Rotary Positive Displacement Pump which means their design features rotating cogs/gears that transfer fluid using a forward motion. Both internal and external ranges of Gear Pumps are classified as Positive Displacement Pumps. Tapflo supply a range of Gear Pumps on behalf of Yildiz Pompa for industrial applications.
Benefits of the Yildiz Range include:
If you’re not sure what type of Positive Displacement Pump you require for your application, contact our team of experts who can help create the ideal pump solution for your business.