Solutions
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
Background
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.
Industries
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®: The Leading Diaphragm Metering Pump for Precision Fluid Management
LEWA ecoflow: The Innovative Universal Metering Pump with DPS Diaphragm Protection. Trusted across all industries, this modular system pump excels in a wide range of applications. Experience unparalleled versatility and reliability with our ecoflow, the ultimate choice in metering pump technology.
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LEWA ecoflow®: Advanced Hygienic Diaphragm Metering Pumps for Sanitary Applications
Discover the LEWA ecoflow® in its hygienic version, designed for sanitary applications. This versatile metering pump maintains its renowned all-around performance while meeting the stringent hygienic standards required in pharmaceutical and food production industries.
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LEWA ecosmart®: Precision-Engineered Diaphragm Metering Pumps for Efficient Fluid Control
Experience the innovative LEWA ecosmart, a compact diaphragm metering pump offering multiplex capabilities at a competitive price. We assure the renowned LEWA quality, backed by our 70 years of market expertise. Choose LEWA ecosmart for smart metering pump solutions without compromising on quality or performance.
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LEWA ecodos®: Robust Mechanical Diaphragm Metering Pumps for Precision Dosing
The LEWA ecodos metering pump delivers absolute reliability, cost-efficiency, and adaptability for applications preferring non-diaphragm actuation. Trust in our proven modular system to design the optimal metering pump tailored to your specific needs.
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LEWA ecodos®: Advanced Sanitary/Hygienic Diaphragm Metering Pumps for Precise Fluid Control
The LEWA ecodos is also offered in a sanitary/hygienic version, expertly meeting all operational standards for pharmaceutical and food production metering pumps.
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LEWA intellidrive®: Cutting-Edge Diaphragm Metering Pump Technology for Precision Fluid Management
Customize both suction and discharge strokes to fit your precise specifications with the LEWA intellidrive® diaphragm metering pump. This technology allows you to individually shape pumping characteristics, ensuring optimal metering for your applications.
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LEWA MAH, MBH, MLM Series: Precision Micro-Metering Pumps for Exact Dispensing
Discover our metering pumps designed for ultra-low flow rates, offering an exceptionally cost-effective solution for proportional metering of fluid components to variable reference values. Ideal for precision applications.
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LEWA FC: High-Precision Laboratory Metering Pumps for Advanced Research Applications
Explore our precision metering pumps designed for micro-flow rates. The FC series, capable of handling pressures up to 400 bar, is tailor-made for laboratory and test center applications, offering unparalleled accuracy for small-scale fluid management.
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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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