Dispersing means the mixing of at least two substances that do not or only hardly mix or chemically bind. In the dispersing process, a substance, also called dispersed phase, is dispersed as finely as possible in another substance, the dispersing agent. In this case, a heterogeneous mixture is produced. The range of liquids, in which different solids can be contained, is various: From skin creams, lotions, to slurries, paint or solid-containing food, such as orange juice.

With the diaphragm metering pumps and streamlined suspension valves, LEWA offers the suitable solution for the metering of fluids with solid particles.


During dispersion, solid particles in between the guiding surfaces of the pumps can lead to jamming of the movable closing unit. If solid particles are trapped, this prevents the complete closing of a valve. Thus, the fluid can flow back through the remaining gap. If the valve opens only slightly (e.g., with very small stroke lengths or high spring load), solid particles larger than the opening gap may not pass of i.e. a valve.

At low flow velocities (small stroke length, small stroke frequency), solid particles can be deposited in the flow dead spaces of the valve. The consequences of this are non-constant flow rate, increased wear, increase in pressure loss, reduced flow rate up to the failure of a pump.

The following solutions are offered by LEWA diaphragm metering pumps with suspension valves for dispersing:

  • Different material pairings in the pump head make it possible to optimally convey the various dispersions
  • Hermetically tight: no foreign matter can enter
  • Easy handling of abrasive dispersions
  • Use of suspension valves:
    • Streamlined
    • For highly viscous fluids, the pressure loss is counteracted, so that enough fluid can be metered and the volume flow can be ensured
    • LEWA intellidrive enables the extension of the suction stroke. This allows the pump to be adapted to different viscosities
    • Speed of the pump can be adjusted to customer requirements, as dispersions sometimes have to be dosed slowly
    • Flexibility: cooled or heated fluid possible
    • Heated pump heads with hot fluid
    • Product is not stressed during the metering process: no segregation of the fluid will occure
LEWA intellidrive diaphragm metering pump


Dispersing – what is it?

If two substances cannot be dissolved in each other or chemically combined, they form an interface. This interface prevents the formation of a dispersion, a heterogeneous mixture of two substances. If these substances are to be mixed together, dispersing is applied. This causes the enlargement of the boundary surfaces, which effectuates a balance of the two substances to be mixed.

More precisely, this is a momentary comminution of the liquid and the solid particles to almost the same size. In addition, long-term stability of the dispersion can be achieved by using emulsifiers and stabilizers. 


Chemical Pumps and Metering Packages for the Chemical Industry

When critical, environmentally hazardous, toxic, or flammable fluids and suspensions need to be reliably conveyed or metered in high-pressure processes, there is no alternative to hermetically sealed metering pumps, process diaphragm pumps, and metering systems from LEWA. Hermetically sealed LEWA pumps with pressures up to 1200 bar are the first choice for the production of chemical intermediate and end products. Contact our experts and let us advise you about your individual chemical pump or system solution!

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Pumps and Systems for the Pharmaceuticals, Life Sciences and Biotechnology Industries

As the leading manufacturer of pumps and pump systems for the pharmaceutical, life sciences, and biotechnology industries, LEWA supports you during the development of complete solutions, which meet your process requirements exactly. Special expertise is required in the production of pharmaceuticals in order to ensure that legal requirements are met. Reliability when it comes to production, documentation, and validation are our top priorities.

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Pumps and Systems for the Food and Beverage Industry

LEWA supports producers and plant construction companies in the food and beverage industries with pumps and systems for homogenization and dispersion, as well as for other processing operations in the food industry. We work with you to plan all the important process-related operations, such as conveying, metering, mixing, heating, and cooling so that you can process your raw product cost-effectively.

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Pumps and Metering Systems for Other Industries

LEWA offers customized solutions and references for almost all industries in which processes require exact metering or the reliable conveyance of fluids. As specialists in fluid handling, we of course also have experience in areas outside of our key markets.

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LEWA ecoflow® diaphragm metering pump

LEWA ecoflow is the innovative and universal metering pump with DPS diaphragm protection system in a tried-and-tested modular system. Suitable for numerous applications, the ecoflow is our real all-around talent, relied on by customers from all industries.

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LEWA ecoflow® sanitary/hygienic diaphragm metering pump

LEWA ecoflow is also available in sanitary/hygienic. The metering pump for hygienic applications has the same all-around capabilities and fulfills all specifications for pharmaceutical and food production.

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LEWA ecosmart® diaphragm metering pump

LEWA ecosmart is an innovative, compact and multiplexing diaphragm metering pump at a smart price. With it, we of course guarantee our renowned LEWA quality and offer you our expertise derived from 70 years in the market.

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LEWA ecodos® mechanical diaphragm metering pump

LEWA ecodos is an absolutely reliable, economical and highly adaptable metering pump, especially where diaphragm actuation is not wanted. Here, we also rely on our tried-and-tested modular system in designing the perfect pump for you.

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LEWA ecodos® sanitary/hygienic diaphragm metering pump

A sanitary/hygienic version is also available for the LEWA ecodos. Here, we meet all requirements for operation in pharmaceutical and food production.

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LEWA intellidrive® diaphragm metering pump

Design the suction and discharge strokes of the metering pump to meet your specific requirements! With LEWA intellidrive technology, you can model pumping characteristics individually.

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LEWA MAH, MBH, MLM Micro-metering pumps

Metering pumps for very small flow rates. An especially cost-effective solution when fluid components must be metered proportionally to a variable reference value.

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LEWA FC laboratory pumps

Metering pumps for very small flow rates. The FC micro-metering pumps for pressures up to 400 bar were developed specifically for laboratories and test centers.

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LEWA Pump Skids

Ready-to-operate, custom-designed pump units with a small-footprint design. We choose all the pumps, materials, and accessories for these pump skids.

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Customer-Specific Metering, Mixing or Filling Systems from LEWA

Customer-specific batch/continuous systems for your production process. Metering, mixing, filling, separating, controlling temperature: We work with you to develop the ideal process-related sequence and produce the system that fits your production process – right up to the end product.

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Customer-Specific Metering Systems from LEWA

Turnkey metering system in closed loop control with monitoring and plausibility testing equipment. Your individually configured metering system with an optimally designed pump for fluid metering in automated processes.

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