5 Reasons to Pick a Positive Displacement Pump

Choosing between a positive displacement pump and a centrifugal pump can be tricky. They act very differently, and if you’re not familiar with them, it can be hard to see why a positive displacement pump might be better for your needs.

Here are 5 reasons to go with a positive displacement pump:

1. High Viscosity - Centrifugal pumps struggle with thick liquids and become inefficient with even mildly viscous fluids. Positive displacement pumps handle thick liquids easily.
2. Low Flow - Centrifugal pumps don’t work well at low flow rates and can suffer from high energy use and poor performance if not running at their best efficiency point (BEP). Positive displacement pumps are great for low flow rates, giving a steady flow of fluid.
3. Metering - Positive displacement pumps are perfect for metering tasks. They provide a constant flow, meeting process needs with ease. Types of positive displacement pumps for metering include:
   • Peristaltic
   • Gear
   • Diaphragm
   • Plunger
   • Piston
4. High Pressure Needs - These pumps are ideal for high-pressure applications, with some models handling over 1,000 psi. However, be cautious: if a positive displacement pump is used against a closed valve, it can build up dangerous pressure, potentially damaging the pump or causing a burst.
5. Shear-Sensitive Liquids - Centrifugal pumps often run at high speeds, which can damage delicate liquids like tomato paste or latex paint. Positive displacement pumps run at lower speeds, making them gentler on such products.

Centrifugal pumps and positive displacement pumps behave very differently. Understanding their behaviors can help you be sure to choose the right one for your application. We offer both types of pumps and would be happy to help you find something for your application.

Expert Assistance

If you think you might need a positive displacement pump, reach out to us to ensure you select the right model. Professional Pump, located in Belleville, Michigan, is equipped to service and repair all makes and models of pumps, valves, and fluid handling systems in the industry. We serve businesses located throughout Michigan and NW Ohio.