What is a Peristaltic Pump?
A peristaltic pump utilizes a flexible tube or hose that is fitted inside a pump casing. They are ideal for transferring abrasive slurries and dosing chemicals, which is why they are sometimes referred to as peristaltic dosing pumps. Peristaltic pump designs will range from smaller Original Equipment Manufacturer (OEM) tube pumps to some of the largest hose pumps in the world for heavy duty industrial applications.
How Does a Peristaltic Pump Work?
A peristaltic pump uses alternating compression and relaxation of the hose or tube to draw in contents. Then, a rotating shoe or oversized roller will pass along the length of the hose. This compresses it completely and creates a perfect seal between the suction and discharge side of the pump. The established vacuum will draw materials into and through the pump with ease.
What’s nice about a peristaltic pump is that the materials being pumped never come into contact with any moving parts, which is why it is so well-suited for corrosive chemicals, liquids and slurries. They can also handle high-pressure ratings because of multiple reinforcement layers within the tube or hose, thus creating much higher suction ability than non-reinforced tubing.
One disadvantage of a peristaltic pump is that it will generally create pulsations. It can be controlled to some degree as you dial in the equipment, but you can’t always expect a perfectly smooth flow.
Components of Peristaltic Pumps
Peristaltic pumps are comprised of two main components: the rotor and the tube/hose.
Rotor: The rotor sits in the middle of the pump chamber and moves in a circular motion. The rotor turns the roller in order to compress the hose for suction and discharge. Most peristaltic pumps are powered electrically.
Hose: The hose or tube is generally made from very high-grade materials and reinforced with extra layers to provide durability, flexibility and protection against whatever materials are being processed. Different applications may require different hose sizes and materials, so it is important to discuss this with your Cortech representative in order to get the right peristaltic pump set-up for your specific pumping needs.
Peristaltic Pump Maintenance
Peristaltic pumps are easy to clean and keep sterile because the tube is the only part of the pump that comes into contact with the process media. Cost of maintenance is relatively low because there are no valves, glands or seals to deal with. The simple design helps prevent backflow or the siphon effect.
Types of Peristaltic Pumps
When it comes to peristaltic pumps, the main variable component will be the hose itself. You’ll want to have the right hose/tube materials to handle whatever slurries, chemicals, abrasive materials or liquids that you will be pumping.
Materials used in peristaltic hoses: