A peristaltic pump, commonly referred to as a roller pump, is a positive displacement pump used to pump a variety of liquids. The fluid is in a flexible tube mounted in a circular pump chamber. The working of a Peristaltic pump is slightly different than a diaphragm pump because a diaphragm pump moves liquid through suction created by a vibrating diaphragm.
Most peristaltic pumps work in rotary motion, but linear peristaltic pumps are also made. The rotor has several “wipers” or “rollers” attached to the external environment and compresses the flexible tube as it rotates.Part of the tube closes under pressure and lets the liquid pass through the tube. Also, when the tube normally opens after passing through the roller, more liquid enters the tube. This process is called peristalsis and is used in many biological systems, such as the gastrointestinal tract. Typically, two or more tube rolls are pressed, and a large amount of liquid is trapped between them. The liquid is sent through the tube to the pump outlet. The peristaltic pump can be operated continuously, or it can be indexed with a slight rotation to produce less fluid.
Working of Peristaltic Pump
A peristaltic pump works in the following way:
The motor spins the wheel on the tube, and the tube turns. The motor pulls the tube out of the housing. In this way, the motor pushes the tube and creates space for the liquid to be absorbed. When the pump runs, it releases fluid. The peristaltic pump can be adjusted with the diameter of this collar or with the wheel, which allows you to dial with the clutch mechanism to get the right amount for your application.
When to use the peristaltic pump?
- Delivery of hemoglobin for dialysis
- Water purification dose (depending on the chemicals used)
- Chlorine for private wells
- Liquid phosphate for size control
- Flocculant (depending on water treatment)
- Add vitamins to animal feed
Using a peristaltic pump includes any application where you want to make sure that nutrients, chemicals, or even blood are not contaminated during dialysis.
Why choose the Verder flex peristaltic pump?
Verderflex pumps set themselves apart from the competition to build quality and reliable performance in some of the toughest environments in the world.
Verder has invested enormous resources in designing, manufacturing, and testing its products, leading to improved components, performance, performance, and advanced functionality. For example, the tube is the most important feature of any peristaltic pump. Verder flex has designed its tube as the longest tube on the market, capable of withstanding corrosive and abrasive applications.The Verderflex tube can also be used with many other peristaltic pumps on the market.
Types of Peristaltic Pumps
1) Hose pump
High-pressure peristaltic pump, which can usually operate at a continuous operating pressure of up to 16 bar (230 psi), use sliding shoes (low-pressure roller type only) and a pump chamber to prevent external damage to the pump. Piping and heat dissipation and the use of reinforced pipes, commonly called “pipes.” This type of pump is often called a “peristaltic pump.”
The biggest advantage of a peristaltic pump over a roller pump is the high operating pressure of up to 16 bar. In the rollers, the maximum pressure can be increased up to 12 times (170 psi) without any problems.If the high operating pressure is not required and if the pumping medium is non-abrasive, tubular pumps are a better choice than peristaltic pumps. With the latest advances in tube technology in terms of pressure, durability, and chemical compatibility, as well as higher flow rates, the advantages of peristaltic pumps over roller pumps continue to diminish.
2) Tube Pump
Low-pressure peristaltic pumps usually have a dry chamber and use non-reinforced squeeze tubes and rollers. This type of pump is called “pump tube” or “pump tubing.” These pumps use rollers to pressurize the tube. These pumps have at least two rollers with 180-degree spacing and can have up to 8 or even 12 rollers.By increasing the number of rollers, the frequency of the pressure pulses of the fluid pumped at the outlet increases, and therefore, the pulse width is reduced.
The disadvantage of increasing the number of rolls is that for a given total flow through the pipe, the number of clamps or elements in the pipe increases relatively, thus shortening the life of the pipe.
Advantages of Peristaltic Pump
- No contamination Since only the part of the pump in contact with the pumped liquid is inside the tube, the inside surface of the pump can be disinfected and cleaned.
- Reduced maintenance and easy cleaning. Since there are no valves, seals, or filler boxes, maintenance costs are relatively low.
- They can control muddy, viscous, sharp, and flowing liquids.
- The peristaltic pump design prevents backflow and siphon without the need for a valve.
- Each cycle pumps a certain volume of liquid, so it can be used to approximate the volume of liquid pumped.
Disadvantages of Peristaltic Pumps
- Socks deteriorate over time and need to be replaced regularly.
- The current becomes pulsed, especially at low speeds. Therefore, these pumps are not suitable for the need for a smooth and uniform flow. Then use another type of positive displacement pump.
- The effectiveness of the viscosity of the liquid is limited.