A few parts and extreme precision. This is the formula for exceptional performances.
At MVV, we have revolutionized the concept of gear pumps: instead of standard high-speed gear pumps, we have designed precision gear pumps that serve as high-precision dosing instruments. These gear pumps incorporate two or more gears that rotate within the pump housing, creating a positive pressure that propels the fluid through the pump. This process, known as positive displacement, ensures accurate and consistent dosing..
As the product being pumped enters the gear pump, it fills the space between the gear teeth and the pump housing. It then moves around the gears, resembling a “paddle wheel” effect. The size of the gear teeth and the speed of their rotation determine the precise quantity of product pumped and metered, eliminating the need for an additional flow meter.
Our precision gear pumps are engineered with specialized materials and undergo advanced heat treatment processes. This results in outstanding wear resistance and dimensional stability, even when operating under extreme temperatures, pressures, and viscosities. Despite their simplicity, with only a few parts, our gear pumps deliver exceptional performance and unmatched precision.
- Tight tolerances and clearances (a few microns)
- Extreme accuracy in continuous pulseless stream dispensing or shot dosing.
- Linear flow with changes in operating speeds, pressures, and temperatures.
- Hardened materials: great wear resistance and possibility to handle abrasive or corrosive fluids.
- Low cost: only three moving parts.
- Capable of dosing extremely high viscosities (over 2.000.000 cP).
- Widely customisable solutions.
efficiency
The main reason to push our knowledge and capability of surface finishing to the maximum is essentially efficiency.
The “active flow meter” concept:
MVV pumps have gained a reputation for their exceptional precision dosing, thanks to their remarkable tight tolerances that measure only a few microns. This level of precision makes them function as “active flow meters,” providing optimal dosing accuracy and efficiency. Unlike conventional flow meters, our pumps deliver a consistent linear flow regardless of the generated pressure, ensuring the highest degree of accuracy achievable.
To achieve such precision, we employ hard and abrasion-resistant steel, minimizing the number of internal components required. This approach enhances stability and minimizes tolerance errors that could affect overall efficiency.
Typically, our pumps are constructed from heat-treated martensitic stainless steel, achieving a hardness of approximately 58 HRC. This eliminates the need for bushings that could compromise alignment and control of operating clearances.
It’s important to note that since our pumps do not incorporate self-lubricating parts such as bushings, they rely on the pumped fluid for lubrication. As a result, pumping “dry fluids” like water or solvents can present challenges. However, it is possible to pump such fluids by reducing the load on the shaft through operating at low speed and pressure.
VISCOSITIES
just an indication on common fluids
During a visit to our office, you will frequently hear the word “viscosity” being mentioned. It is one of the crucial parameters we inquire about from our customers, right after determining the required flow rate.
Viscosity plays a vital role in pump operation, particularly in finding the optimal performance range. At a certain viscosity level, the fluid forms a protective film on the internal surfaces of the pump. This film, which is just a few microns thick, maintains equilibrium by lubricating the rotating parts and facilitating smooth pump operation. It acts as a safeguard, ensuring that the pump operates flawlessly and efficiently.
| Material | Viscosity |
| Water (20°C) | 1-5 cP |
| Alcohol 90° | 3-7 cP |
| Ethylene glycol | 15 cP |
| Corn oil | 65 cP |
| Motor oil SAE 30 | 150-200 cP |
| Motor oil SAE 40 | 250-500 cP |
| Glycerin | 1000 cP |
| Honey | 3000-5000 cP |
| Chocolate syrup | 10000 cP |
| Mustard or ketchup | 50000-70000 cP |
| Toothpaste | 300000 cP |
| Caulking compound (silicon) | 1000000-5000000 cP |
VISCOSITIES
just an indication on common fluids
During a visit to our office, you will frequently hear the word “viscosity” being mentioned. It is one of the crucial parameters we inquire about from our customers, right after determining the required flow rate.
Viscosity plays a vital role in pump operation, particularly in finding the optimal performance range. At a certain viscosity level, the fluid forms a protective film on the internal surfaces of the pump. This film, which is just a few microns thick, maintains equilibrium by lubricating the rotating parts and facilitating smooth pump operation. It acts as a safeguard, ensuring that the pump operates flawlessly and efficiently.
| Material | Viscosity |
| Water (20°C) | 1-5 cP |
| Alcohol 90° | 3-7 cP |
| Ethylene glycol | 15 cP |
| Corn oil | 65 cP |
| Motor oil SAE 30 | 150-200 cP |
| Motor oil SAE 40 | 250-500 cP |
| Glycerin | 1000 cP |
| Honey | 3000-5000 cP |
| Chocolate syrup | 10000 cP |
| Mustard or ketchup | 50000-70000 cP |
| Toothpaste | 300000 cP |
| Caulking compound (silicon) | 1000000-5000000 cP |
CURVES
The provided curves clearly demonstrate the exceptional linearity of our pumps, even under high pressures and low speeds.
With efficiency exceeding 99.5% in most cases, our pumps deliver outstanding performance.
Please note that these curves represent two specific examples, considering predefined viscosities and speeds. Typically, we do not provide extensive flow curves as our pumps are known for their linearity. To estimate the expected flow rate, you can multiply the speed by the pump’s displacement, which will provide a close approximation.
Our pumps maintain their performance consistency regardless of the viscosity or pressure.
For instance, even with a low viscosity fluid of 100 cP at 100 bar, using a small 0.6cc/rev pump, the efficiency remains above 90%. This remarkable performance sets our pumps apart, offering unbeatable reliability and precision.
