Frequently Asked Questions

We have listed here the answers to the most frequently asked questions we get from potential clients. If you need more information or have a question not listed here, please contact us, we will be happy to provide all the information you are interested in.

  • Diener US micro dosing pumps use piston-driven or gear-based mechanisms to precisely move small, repeatable fluid volumes with high accuracy. Our advanced designs feature adjustable stroke volume capability, allowing for fine-tuning of flow rates and dose sizes, which makes them ideal for applications requiring minimal pulsation and precise dosing across various fluid viscosities.

  • Micro dosing pumps offer superior precision, reliably consistent pulsation-free flow, lower operational and maintenance costs and greater durability compared to peristaltic pumps.

  • Fluids with high viscosity experience greater pressure drops, increasing the risk of cavitation in systems with restrictive inlet conditions. Conversely, lower-viscosity fluids may cavitate more easily due to faster flow dynamics. 

  • Diener pumps feature a magnetic coupling design without seals, eliminating leakage and ensuring reliable operation in medical and laboratory settings.

  • Diener pumps provide precise micro-dosing with self-priming and low inertia designs along with chemical inertness for consistently precise results and fast response times.

  • Diener pumps are constructed with chemically inert materials like stainless steel, ceramics, PEEK, and EPDM, ensuring compatibility with diverse chemicals.

  • Diener pumps are capable of mixing, dosing, and transferring reagents, buffers, and sample fluids to ensure diagnostic accuracy and workflow efficiency.

  • Certainly, Diener pumps can be tailored to meet the specific requirements of OEMs in terms of features, size, and production volumes.

  • Yes, Diener pumps ensure consistent, pulse-free ink delivery with precise electronic control for smudge-free, high-resolution printing.

  • Diener pumps are capable of handling dye-based, solvent-based, and pigmented inks, including those with abrasive properties like white ink.

  • Our pumps feature magnetic couplings without shaft seals, providing hermetically sealed, leak-proof performance essential for handling hazardous chemicals safely.

  • Yes, our pumps are designed to produce high-pressure outputs necessary for effective atomization in spray disinfection applications.

  • Yes, our pumps are constructed with chemically resistant materials, making them suitable for a wide range of aggressive chemicals used in disinfection and sterilization processes.

  • Our gear pumps are fitted with helical gears, minimizing noise and vibration to enhance patient comfort during treatment.

  • Yes, our pumps are constructed with materials proven to withstand repeated chemical heat clean cycles, ensuring durability and performance stability.

  • Our pumps achieve repeatable performance and micro-dosing through extremely tight manufacturing tolerances, ensuring accurate fluid management.

  • Our pumps feature rapid acceleration and high volumetric efficiency capabilities, allowing them to immediately adapt to changes in cooling requirements, ensuring optimal thermal management in a wide range of cooling systems.

  • Yes, our pumps are designed to manage high static case pressures, making them ideal for use in automotive systems and other high-pressure cooling applications.

  • Yes, our pumps are constructed with chemically resistant materials, making them compatible with a wide range of refrigerants, including freon and water/glycol mixtures.

  • Our pumps are constructed with FDA-approved, food-safe materials such as Stainless Steel, PEEK, and EPDM, ensuring durability and compliance with food safety standards.

  • Yes, our pumps have large interior passages that allow easy transfer of high-viscosity fluids like syrups and emulsified fruit juices.

  • Our flow-through design allows for quick clean-in-place flexibility, eliminating "dead zones" where bacteria could grow, ensuring maximum hygiene.

  • Cavitation can be predicted using software tools that simulate fluid dynamics and calculate pressures across the pump. Measuring vacuum at the pump inlet under worst-case conditions can also help identify cavitation risks.

  • Cavitation causes pitting, erosion, and material fatigue, especially on internal surfaces. Materials like hardened metals or coatings resistant to wear and corrosion offer better durability against cavitation damage. 

    • Cavitation happens when pressure drops below the fluid's vapor pressure, forming vapor bubbles. Bubbles then collapse in zones with higher pressure, releasing energy and causing erosion, noise, and vibration.
    • Common signs of cavitation include unusual noises, pitting in pump’s walls, flow interruptions and cloudy output fluid.
    • Longer term conseuences of cavitation include erosion of pump’s internal surfaces, premature wear of pump components, and inefficient and noisy operation.
    • Major causes of cavitation include long tubing, clogged inlet filters, poorly designed pump hydraulic systems, and high pump operation speeds.
    • Cavitation can be mitigated by proper system design and monitoring inlet conditions.

  • Cavitation occurs in areas of low pressure, often behind moving parts or near inlet components. As the fluid moves into high-pressure regions, the collapsing bubbles cause localized damage.

  • Key factors include fluid properties (viscosity, vapor pressure, and density), temperature, pump speed, inlet restrictions, hydraulic lift, and system design. Inadequate inlet pressure and long or narrow tubing significantly increase the likelihood of cavitation.

  • We perform all prototype design and construction in our California R&D facility. Prototype design and production time ranges from 2-15 days. Prices vary depending on complexity. Contact us for any questions or a free consultation.

  • Custom is sometimes misinterpreted to mean expensive. This is not the case. At Diener Pumps US we design each pump for a specific application ensuring optimum performance, a small package size, minimum power consumption and long life—resulting in space savings, low power consumption and a lower installed cost.

  • At Diener Precision Pumps US we design and manufacture custom precision gear and metering pumps to fulfill global fluid management OEM requirements in diverse industries.

  • At Diener Pumps US we test every pump under the client's operating conditions. This ensures that the pump performs up to expectations before the client starts using it in their equipment. We can also conduct long-term endurance testing, and environmental and chemical compatibility testing.

  • No, at Diener Precision Pumps USA we design and engineer every pump to suit our customer’s exact needs. We have a minimum volume requirement of 100 pieces/year.

  • The customer provides DPP US with the performance requirements via an Application Data Sheet (ADS). We use this information to size the pump, design the interfaces and set up the test/validation program.

  • The pumps service life will depend on the application (flows, pressures, fluid cleanliness, duty-cycle, etc). Diener US engineering team is experienced in creating life-enhancing designs and takes this into consideration with each application. In many applications, our pumps out last the life of the instrument.

  • Diener Pumps US uses inert materials which resist a wide range of fluids. The wetted materials are chosen in line with the intended application and the fluids that the client's system is designed to handle.

  • Yes, all our pumps are self-priming.

  • Yes, all Diener US pump models are bidirectional.

  • Diener US gear pumps use magnetic coupling to transmit torque from the motor to the pump without a shaft seal, ensuring no leaks and easier cleaning.

  • Diener US gear pumps are typically fitted with BLDC, conventional DC and AC motors. Our metering pumps are usually attached to either stepper or BLDC servo motors (to maintain dispense accuracy).

  • A metering pump is a positive displacement pump used to accurately move small fluid volumes with every movement of a piston inside the pump. Diener US metering pumps all feature adjustable flow rates, meaning they use a ceramic piston with a variable displacement to “dial in” exact flow rates.

  • A gear pump contains two-or-more gears that rotate, carrying small pockets of fluid between the gear teeth. These pockets are squeezed as the gears mesh, forcing the fluid out. At Diener Pumps US we design and manufacture precision micro gear pumps for safe, pulse-free transfer of liquids of diverse composition, viscosity and temperatures in a wide range of applications.

  • Diener Precision Pumps' manufacturing is performed at our facility in Embrach, Switzerland, to the highest Swiss standards for precision and quality. All design, development and prototyping is performed at our R&D facility in California, US.

  • All our facilities - R&D and manufacturing  operate according to ISO 9001:2015. Further certifications for environmental, sanitary, and medical standards are available on a case-by-case basis. Please reach out to us for details.

  • Diener US pumps will generally last the full service life time of the encompassing devise/system, therefore servicing is not required. If performance drop does happen, it is more cost effective to replace the pump head than to service it.