Which type of metering pump is considered the most reliable?

Peristaltic pumps are often considered the most reliable type of metering pump due to their unique design and operational characteristics. These pumps work by compressing a flexible tube with rollers, which creates a vacuum that draws fluid into the tube and then pushes it out as the rollers rotate. This mechanism minimizes contact between the fluid and the pump components, which reduces the risk of contamination and corrosion, making them particularly suitable for a wide range of applications, including those that handle abrasive or viscous fluids.

Furthermore, peristaltic pumps are advantageous in their ability to handle varying flow rates while maintaining accuracy, and they can run dry without damaging the pump. The straightforward design allows for easy maintenance and replacement of the tubing, which is often the only part that wears out, enhancing their reliability over time.

In contrast, while diaphragm pumps, piston pumps, and rotary gear pumps each have their own strengths and applications, they may be more susceptible to wear and require more frequent maintenance to ensure reliable operation. Diaphragm pumps can have issues with diaphragm rupture, piston pumps can experience wear on seals, and rotary gear pumps may struggle with thicker fluids unless properly designed. These factors can affect their overall reliability compared to peristaltic pumps.