# Peristaltic Pumps (DD-689)

> A peristaltic pump is a positive-displacement pump. Rollers or shoes on a rotating head squeeze a flexible tube against a curved track, trapping 'pillows' of fluid and pushing them forward, while the tube springs back behind them to draw in more. The fluid only touches the inside of the tube, so the pump suits sterile, corrosive, shear-sensitive or hygienic fluids, and changing the tube is all it takes to switch fluids. The Reel gets one thing backwards, though. Peristaltic flow naturally pulses as each roller lifts off the tube. Manufacturers reduce pulsation with more rollers, offset or out-of-phase tube channels, dampers or compliant tubing, but don't eliminate it. The tube itself is the part that wears out. The design dates back at least to an 1855 US patent, and roller pumps later became standard for moving blood in medical equipment.

- Department: Tech (also Science)
- First published: 2026-01-05
- Last updated: 2026-01-05
- Permalink: https://detailenjoyer.com/case/peristaltic-pumps/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **1855**: An 1855 US patent covers an early version of the tube-squeezing pump

Full timeline: https://detailenjoyer.com/timeline/?case=peristaltic-pumps

## Quick facts

- **DD-689-F01**: In a peristaltic pump, the fluid touches only the inside of the tube. _(Write-up · Exhibit B (Tube-only contact))_
- **DD-689-F02**: Peristaltic pump flow naturally pulses as rollers lift off the tube. _(Write-up · Exhibit C (It pulses))_

## Write-up

Squeeze, roll, repeat. Rollers push fluid along a tube it never leaves.

1. **How it works**: Rollers or shoes squeeze a flexible tube against a track, trapping pockets of fluid and pushing them forward as the head turns. The tube recovers behind them and draws in more fluid.
2. **Tube-only contact**: The fluid touches only the inside of the tube, which suits sterile, corrosive or hygienic fluids. Switching fluids just means changing the tube.
3. **It pulses**: Each roller lifting off the tube creates a pulse in flow and pressure, which can cause vibration and measurement errors.
4. **Taming the pulse**: More rollers, offset or out-of-phase tube channels, dampers and compliant tubing reduce pulsation but don't remove it.
5. **History**: The idea dates back at least to an 1855 US patent, and roller pumps were later adopted for moving blood in medical devices.

## Related case files

- [Piston Pumps (DD-072)](https://detailenjoyer.com/case/piston-pumps/): Another positive-displacement pump
- [CIPP (DD-676)](https://detailenjoyer.com/case/cipp/): Another case about tubes and pipes
- [Berlin Heart (DD-577)](https://detailenjoyer.com/case/berlin-heart/): Another pump that moves fluid without touching it

## Reel vs. record

- **Wrong**: peristaltic flow isn't 'pulseless'. It naturally pulses as each roller lifts off the tube, and designs can only reduce the pulsation.
- **Missing tradeoff**: the tube is a wear part that must be replaced regularly. The tube's material sets the pump's chemical compatibility and pressure limits.
- **Missing detail**: rollers versus shoes is a real design choice. Shoe pumps usually run tubes filled with lubricant and handle higher pressures.
- **Accurate**: the fluid touches only the tubing, which is why these pumps suit sterile and corrosive fluids, and switching fluids just means changing the tube.
- **Missing history**: the design dates back at least to an 1855 US patent, and roller pumps later became common in medical equipment for moving blood.

## Video: Peristaltic Pumps: Squeeze, Roll, Repeat

- Duration: 25.8 s · Published: 2026-01-05
- File: https://detailenjoyer.com/assets/videos/DTIwr_HkX73.mp4

### Transcript

DID YOU KNOW? Peristaltic pumps are a type of positive displacement pump that move fluids through a flexible tube using a series of rollers, or shoes, that compress and release the tubing in sequence. As the rollers squeeze the tube fluid is pushed forward, creating a smooth pulseless flow, without the fluid ever contacting the pump's internal components. This design makes peristaltic pumps ideal for handling sensitive, corrosive, or sterile liquids such as medical fluids, chemicals, or food products. NOW YOU KNOW!

## Questions & answers

**Q: What kind of pump is a peristaltic pump?**  
A: Positive displacement. _(Source: Write-up · Exhibit A (How it works) · Watson-Marlow Fluid Technology Solutions: Peristaltic pumps, how do they work?)_

**Q: What does the fluid touch in a peristaltic pump?**  
A: Only the tube. _(Source: Write-up · Exhibit B (Tube-only contact) · Watson-Marlow Fluid Technology Solutions: Peristaltic pumps, how do they work?)_

**Q: What does peristaltic flow naturally do?**  
A: It pulses as rollers lift off the tube. _(Source: Write-up · Exhibit C (It pulses) · VWR / Masterflex: How to reduce pulsation in peristaltic pumps; PCT Flow: Pulsation in peristaltic pumps and other positive displacement pumps)_

**Q: Which of these reduces pulsation?**  
A: More rollers, among other fixes. _(Source: Write-up · Exhibit D (Taming the pulse) · VWR / Masterflex: How to reduce pulsation in peristaltic pumps; Physical Review Applied (2022): Smoothing oscillatory peristaltic pump flow with bioinspired passive components)_

**Q: Roughly when was the design patented in the US?**  
A: 1855. _(Source: Write-up · Exhibit E (History) · Wikipedia: Peristaltic pump)_

## Sources

- [Watson-Marlow Fluid Technology Solutions: Peristaltic pumps, how do they work?](https://www.wmfts.com/en-us/support/pump-principles/peristaltic-pumps-how-they-work/)
- [VWR / Masterflex: How to reduce pulsation in peristaltic pumps](https://www.vwr.com/us/en/support/tech-articles/masterflex/reducing-pulsation-peristaltic-pumping)
- [PCT Flow: Pulsation in peristaltic pumps and other positive displacement pumps](https://www.pctflow.com/applications/pulsation-in-peristaltic-pumps-and-in-other-type-of-positive-displacement-pumps/)
- [Physical Review Applied (2022): Smoothing oscillatory peristaltic pump flow with bioinspired passive components](https://doi.org/10.1103/physrevapplied.18.064013)
- [Wikipedia: Peristaltic pump](https://en.wikipedia.org/wiki/Peristaltic_pump)

## Cite this case file

Easterling, Marcus. "Peristaltic Pumps." The Detail Department (DetailEnjoyer), case file DD-689, last updated Jan 5, 2026. https://detailenjoyer.com/case/peristaltic-pumps/