Flexible pump speed of choice
Flexible pumps operate by drawing in and discharging fluid through three distinct stages (refer to the working principle diagram). The initial step involves ensuring that the fluid enters the pump chamber, which is typically achieved through the pump's self-priming ability or the weight of the fluid itself. This process is essential for the proper functioning of the pump. Therefore, selecting the appropriate speed is fundamentally a matter of optimizing suction performance.
In high-viscosity applications, if the speed is too high, it can lead to cavitation, resulting in noise, vibration, and even motor overload. It may also reduce the lifespan of the impeller. To prevent these issues, as the viscosity of the media increases, the pump diameter should be increased, and the rotational speed should be reduced accordingly.
Our company’s flexible pumps are designed to handle media with viscosities up to 10,000 cps. In such cases, the fluid can often be drawn into the pump chamber by its own weight, making the process more efficient and less stressful on the system.
The relationship between viscosity and maximum allowable speed is outlined in the table below:
| Medium Viscosity Range (centipoise) | Corresponding Maximum Speed (rev/min) |
|-------------------------------------|----------------------------------------|
| 1000 or less | 1400 |
| 1000–2500 | 960 |
| 2500–5000 | 700 |
| 5000–10000 | 600–200 |
Beyond viscosity, several other factors influence the selection of pump speed:
- For abrasive media, reducing the speed can significantly extend the pump’s service life.
- When handling fragile or shear-sensitive materials, such as yogurt, it’s recommended to keep the speed below 600 rpm to avoid damaging the product.
- Additionally, the pump’s self-priming capability is closely related to its speed. To maintain a self-priming height of at least 3 meters, the speed should be no less than 800 revolutions per minute.
By carefully considering these factors, you can optimize the performance and longevity of your flexible pump, ensuring it operates efficiently under various conditions. Whether you're dealing with thick slurries or delicate liquids, choosing the right speed is key to achieving reliable and consistent results.
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