LEWA ecoflow®: Industry-Leading Diaphragm Metering Pump for Accurate Fluid Delivery
The all-around talent for virtually all industries.
Mastering the challenging conditions of offshore rough seas and meeting the stringent requirements of pharmaceutical cleanrooms, the ecoflow diaphragm metering pump's global success underscores its unparalleled reliability and cost-effectiveness in diverse industries.
Known for accurate metering rates and enduring tough conditions, this pump stands out for its low lifecycle costs and superior energy efficiency, making it an ideal metering pump for various applications.
With its proven modular system, the ecoflow series can be tailored with specific pump heads and drives, suitable for nearly any application. Setting technological and quality benchmarks, every ecoflow diaphragm metering pump is outfitted with the patented DPS diaphragm protection system and proudly manufactured in Germany, solidifying its status as a top-choice metering pump.
Top Advantages of Choosing a LEWA ecoflow® Metering Pump for Your Applications
The LEWA ecoflow is a hydraulically actuated diaphragm metering pump that provides numerous advantages over comparable pumps.
Unique suction capability
The distinctive feature of the LEWA ecoflow diaphragm metering pump lies in its unparalleled suction capacity. Boasting an absolute suction pressure of up to 0.1 bar abs., it not only offers versatile and secure installation options but can also contribute to lower operating costs for the entire system compared to alternative pumps.
Absolutely safe startup
Initiating the metering pump is both safe and straightforward: In its non-operational state, a spring ensures the diaphragm is consistently pulled into a secure position. This guarantees maximum safety during system startup and extends the diaphragm's service life significantly.
Low maintenance costs and a long service life
The ecoflow series is renowned for its extended service life across all components, coupled with exceptionally low maintenance and operating costs. By adhering to regular maintenance intervals, our diaphragm pumps can reliably operate for 40 years or more within your production process.
API 675‐Standard
The ecoflow series adheres to the globally recognized quality standard set by the American Petroleum Institute API 675. Comprising comprehensive definitions for the design, construction, performance, and acceptance testing of diaphragm metering pumps in industrial applications, our pumps meet the highest industry standards.
Safety and reliability in extreme operating states
At the core of our values is a commitment to safety and reliability. Our pump is engineered to withstand operating errors and extreme conditions without sustaining damage. With built-in safety mechanisms, we prioritize maximum protection for both users and machines. This safeguard extends not only to instances of excess primary pressure but also when pressure or suction lines are closed.
Suitable for virtually all fluids
The ecoflow series is suitable for almost all liquids thanks to its flexible design. Whether they are dangerous, toxic, abrasive, viscous, environmentally harmful or sensitive fluids, the user-specific configuration always gives you the correct diaphragm metering pump.
Patented sandwich diaphragm
Our patented LEWA sandwich diaphragm is not only extremely durable, but also well-protected. The LEWA DPS diaphragm protection system and a diaphragm monitoring system allow us to ensure that the diaphragm does not tear during operation and that the pump fluid is not contaminated.
Integrated pressure relief valve
A pressure relief valve in the hydraulic part of the diaphragm pump prevents potential overload situations in operation. This valve is individually adjustable and can therefore be adapted to different operating situations.
High energy efficiency
LEWA diaphragm pumps achieve the highest efficiency of all pump technologies. Our ecoflow series also combines high efficiency with low energy consumption.
Hermetically sealed
Diaphragm pumps work without dynamic seals in the process fluid area. This forms a hermetically sealed working area. No emissions escape to the outside, and contamination of the fluid is impossible.
Worldwide standards
When designing pumps, we adhere to globally valid standards such as VDMA 24284, 24286‐10 and FDA guidelines.
LEWA Smart Monitoring: Cutting-Edge Solutions for Intelligent Pump Surveillance
With digital pumps for more efficiency, system availability and profitability of the entire production.
LEWA Smart Monitoring is a monitoring system consisting of sensors, a programmable logic controller (PLC), an industrial PC (IPC) and data analysis for new and existing pumps. The system determines characteristic values and key performance indicators. There is no intervention in process control or direct contact between the sensor system and the conveyed fluid.
With key performance indicator-based condition monitoring, you detect and monitor operating statuses proactively. You can also optimize the overall output and robustness of your pump and pipe systems. This will increase the efficiency of your entire production plant. You can access the data conveniently via your corporate network. Or you use the LEWA cloud with extended analysis and service offers.
Learn more about LEWA Smart Monitoring
Explore Videos on LEWA ecoflow®: Your Insight into Advanced Metering Pump Technology
LEWA Creating ecoflow
LEWA ecoflow – complete animation
LEWA ecoflow – snifting valve
LEWA ecoflow – pressure relief valve
LEWA ecoflow – pressure in pump head M910
LEWA ecoflow - multiplex drive element
LEWA ecoflow - mounting of diaphragm
LEWA ecoflow - diaphragm monitoring
LEWA ecoflow - M910 upset suction condition
Key Features of Advanced Metering Pumps for Optimal Performance
Multiplex capability
Single drive units with vertically installed motor are space-saving. Alternatively, multiple drive units with identical or different output can be combined for pulsation reduction or recipe metering.
Customized valves
LEWA uses numerous special types of valves such as specially hardened valves for liquified gases or valves with minimal dead space for the food and pharmaceutical production.
Diverse connection geometries
Our pumps are equipped with all common connection geometries such as DIN standard, BASF's high-pressure standard, American ANSI, JIS, or your individual requirements. Customized configurations are possible.
Integration into process control systems
The signal acquisition of process control systems is achieved analogously or digitally. Flow rate is adjusted via electric or pneumatic stroke adjustment, alternatively by motor drive (FU).
Diagnostic connection
Our pumps and systems have connections that facilitate the diagnosis of their performance. This is done by a service technician on site or via remote monitoring.
Heating and cooling jackets
With heating and cooling jackets, our pumps are suitable for almost any temperature and can convey fluids at low temperatures or extreme heat.
Intellidrive technology
Using the highly-dynamic servomotor, you can adjust the stroke of the pump to the requirements of your system and your process.
Special design materials
If the process demands it, wetted parts such as pumps heads and valves will be made of special materials such as stainless steel 316/316L (1.4401/1.4404), Hastelloy or Duplex steel and PVC.
Sanitary & hygienic design
LEWA pumps and systems in sanitary & hygienic design are available for applications that require extremely high purity, such as food production and the pharmaceutical industry.
Explore Our Comprehensive Range of Metering Pumps for Every Application
LEWA ecoflow diaphragm metering pumps offer a broad performance range through the combination of diverse pump heads and gear units. This versatility ensures we can supply an energy-efficient, high-performance metering pump tailored to your specific application needs.
Drive unit data
| Type | Hydraulic power[kW] |
|---|---|
| LDB | 0.1 |
| LDC | 0.2 |
| LDD | 1.0 |
| LDE | 2.0 |
| LDF | 3.5 |
| LDG | 6.0 |
| LDZ | 15 |
| LDH/LDHB | 20/35 |
Key Installation Dimensions for Seamless Integration
Maximize Efficiency: Save space and reduce weight by arranging pumps in multiple configurations or opting for the compact boxer design. Achieve simultaneous metering of multiple liquids using diverse pump heads
Installation dimensions
| Type | L [mm] | B [mm] | ΔB [mm] | H [mm] |
|---|---|---|---|---|
| LDB | 400 | 400 | 185 | 260 |
| LDC | 450 | 500 | 220 | 320 |
| LDD | 700 | 750 | 280 | 610 |
| LDE | 800 | 900 | 350 | 690 |
| LDF | 1130 | 900 | 430 | 940 |
| LDG | 1300 | 1300 | 490 | 1000 |
| LDZ | 1700 | 1700 | 700 | 1140 |
| LDH | 2100 | 1800 | 717 | 1500 |
Pump Head Variants: Enhance Performance and Versatility in Metering Pumps
Explore Our Range of Pump Heads Tailored for Diverse Metering Pump Applications. From General Purpose to High-Temperature, High-Pressure, or Corrosive Fluid Environments, We Have You Covered
Pump head M500
Universal diaphragm pump head with PTFE sandwich diaphragm for high flow rates. Proven, durable, reliable and with diaphragm position control.
| Type | M500 |
| Pressure | 350 bar |
| Flow rate | 19 m³/h |
| Temperature | -50/+150 °C |
| Viscosity | 100.000 mPa∙s |
| Operational capability | Metal pump heads (316/316L): can be installed on all ecoflow drive units ≥ LDE Plastic pump heads (PVC/PVDF/PTFE): can be installed on all ecoflow drive units ≤ LDE |
Pump head M900
State of the art universal diaphragm pump head with PTFE sandwich diaphragm for maximum operational safety. Robust and reliable with unmatched standard of protection against difficult start up, faulty operation and upset conditions. The patented DPS technology also enables a suction lift capability that is globally unique in the field of hydraulically actuated diaphragm pumps.
| Type | M900 |
| Pressure | 500 bar |
| Flow rate | 6 m³/h |
| Temperature | -20/+150 °C |
| Viscosity | 100.000 mPa∙s |
| Operational capability | Can be installed on all ecoflow diaphragm metering pumps |
Pump head M800
Universal diaphragm pump head with PTFE sandwich diaphragm for extreme pressures. The special geometry of the diaphragm clamping system enables the use of PTFE diaphragms in pressure ranges up to 800 bar and thus results in a very compact shape. Very economical solution in the range of high pressures, especially in comparison to pump heads with metal diaphragms.
| Type | M800 |
| Pressure | 800 bar |
| Flow rate | 1,1 m³/h |
| Temperature | -10/+60 °C |
| Viscosity | 100.000 mPa∙s |
| Operational capability | Can be installed on all ecoflow process diaphragm pumps ≥ LDF. |
Pump head M200/M400
Proven pump head with metal diaphragm for extreme pressures and high temperatures. Also suitable when a high degree of permeation resistance is required. The diaphragm is working between two contour plates, limiting the deflection of the diaphragm and providing an extreme level of operational reliability. The diaphragm monitoring system offers a plus for safety by immediately displaying the damage of a diaphragm layer.
| Type | M200/M400 |
| Pressure | 1.200 bar |
| Flow rate | 1,1 m³/h (M200) 0,8 m³/h (M400) |
| Temperature | -40/+200 °C |
| Viscosity | 500 mPa∙s |
| Operational capability | M200 can be installed on all ecoflow diaphragm metering pumps ≤ LDE, M400 can be installed on all ecoflow process diaphragm pumps ≥ LDF. |
Special pump heads in remote head design
Some tasks in process engineering include the metering or circulation of media with critical properties like high temperature and high abrasivity. These critical conditions frequently need to be kept away from the displacer system of the metering pump, either to protect the system or its operating personnel. A normal metering pump is not suitable for such tasks due to its compact design.
| Type | MR / MV / KV |
| Pressure | 500 bar |
| Flow rate | 19 m³/h |
| Temperature | -70/+400 °C |
| Viscosity | 100.000 mPa∙s |
| Operational capability | Remote pump heads can be installed on all LEWA ecoflow metering and process pumps and on all LEWA triplex metering and process pumps. |
Industries
Pumps and Packages for the Production of Crude Oil and Natural Gas
LEWA has been your expert in pumps and packages since the 1950s. With us, you get everything from a single source: Our custom-built packages are used all around the world for offshore crude oil and natural gas production. From China to the United Arab Emirates, strong partners rely on our expertise for crude oil exploration applications.
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Gas Odorization with LEWA Pumps and Metering Packages
Natural gas, oxygen, and nitrogen are odorless but potentially dangerous. This is why these gases are "odorized" with as strong a smelling substance as possible. For more than 40 years, LEWA has been developing systems for the odorization of gases such as natural gases, biogases, and liquefied gases. This process is enormously important, so the odorizing system has to operate precisely and reliably.
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Pumps and Metering Systems for Distillation Plants and Applications in Refineries
Crude oil must be cleaned, separated, and converted (refined) until the final products suitable for sale are made (e.g., gas, diesel, heating oil, lubricants, propane, butane). LEWA supports you with pumps and metering systems, which are used in the refining process during chemical metering. Application with our products are distillation plants, coker, cracker, or visbreaker, for example. Ask our experts for more information!
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Pumps and Metering Packages for the Petrochemical Industry
We have supplied durable pumps and metering systems for applications such as the hydrocracking process for over 50 years. Petrochemicals generate starting products for the manufacture of plastics, pharmaceuticals, colorants, detergents, and other products. Contact our experts and allow us to provide you with detailed information about metering and pumping solutions for the hydrocracking process!
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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 Plastics Industry
We offer you special expertise for all compounding processes in the plastics processing industry (addition of waxes, flame retardants, and lubricants). Contact our experts! We're happy to give you advice about metering and pumping solutions for the plastics industry such as in polyethylene processing.
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Pumps and Systems for the Manufacture of Detergents and Cleaners
LEWA offers continually operating, formula-controlled systems for the manufacture of household and industrial cleaners in all commercially available surfactant concentrations – from raw product to end product. Contact our experts and let us advise you – we will work with you to configure pumps and systems for the manufacture of detergents and for the production of other cleaners.
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Pumps and Systems for the Production of Personal Care Products
Processes with strict quality and hygiene requirements, such as GMP or the need to avoid preservatives, require the right equipment. We support you in the selection and the design of hygienic components and systems for producing personal care products. Contact our experts and let us advise you – we will work with you to develop customized metering solutions for your process, such as for manufacturing personal care products.
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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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Metering Packages and Pumps for Power Plants and Power Suppliers
LEWA supports power plant operators and power suppliers with pumps and systems for conveying, metering, and mixing different fluids. We not only provide power plants with our products, but also develop solutions for wastewater treatment plants, gas bottlers, biogas producers, regional power suppliers, and hydrogen producers.
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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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Pumping solutions for mining and metal and mineral processing
From the explosives manufacturing, ore extraction and metal and mineral recovery to effluents treatment and final product finishing, our solutions have helped our clients to save energy and consumables while keeping high operational safety and low cost of ownership.
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Additive metering for plastics
LEWA provides system solutions for metering additives for plastics. Ask our additive metering experts for more information!
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Amine treatment
At LEWA, you receive pumps and systems for amine treatment in power plants. Ask our experts for more information.
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Downstream processing
LEWA systems and gradient mixers are used in downstream processing of chemicals and biotechnology. We look forward to receiving your inquiry!
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Caustic soda production
At LEWA, find out about custom plants for producing and diluting different bases like caustic soda. Ask our experts for more information.
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Wet oxidation of waste water
For wet oxidation and other processes, we recommend our tried-and-tested LEWA diaphragm pumps. Ask our experts for more information!
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Polymerization
LEWA manufactures metering pumps and metering systems for polymerization which optimally meet the necessary requirements. We are happy to help.
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Extruder blowing agents
Precise metering of blowing agents into extruders with LEWA systems. We provide you insights on the metering accuracy and process optimization solutions from LEWA.
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Extraction with supercritical fluids
Processes with supercritical fluids in pharmaceutical, food and beverage industries. Ask our experts for more information!
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Pharmaceuticals production
Metering pumps and metering systems must meet the following demands of pharmaceutical production.
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Production of melamines
LEWA metering and process diaphragm pumps meet the specific demands for the production of melamine (trimerization of urea). Consult us!
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Chemical metering in high-pressure cleaning systems
LEWA metering and process diaphragm pumps meet the specific demands for the production of melamine (trimerization of urea). Consult us!
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Production of biodiesel
LEWA provides metering systems for producing biodiesel and other biofuels. Consult us!
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Disposal of hydrocarbon condensate
LEWA systems help you transport and dispose of hydrocarbon condensates (HCC) that arise when producing natural gas, both onshore and offshore.
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Dilution of surfactants
Dilution of surfactants such as sodium lauryl ether sulfate (SLES) with LEWA pumps during production of detergents.
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Butter production
In order to sustain consistent quality of spreadable butter, ingredients like rapeseed oil, water, and brine are metered flexibly and fully automatically with ecoflow pumps.
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Production of biofuels
Biofuels are produced using metering and process pumps from LEWA in the remote-head design. Learn more about these and other applications!
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Coal refinement with remote-head metering pumps in condensing systems
When coal is refined, it is ground as fine as dust and mixed into a suspension kept at a high temperature. LEWA metering pumps with a remote pump head are used for this.
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Flue gas cleaning by means of metering sulfur | LEWA
When using an electrofilter for flue gas cleaning, metering sulfur improves the filtration efficiency. LEWA has the solution!
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Production of gelatine
In the production of gelatin and in the fabrication of gelatin products, LEWA pumps and systems are used. We would be happy to give you more information!
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Processing of produced water
Produced water packages from LEWA can be used to purify produced water during oil drilling. They are hermetically sealed and have options for exact control.
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Autonomous energy utilities
Supplying energy to production plants in remote areas of application is often difficult. Ensure an autonomous fuel supply with diaphragm pumps.
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High purity systems
Pumps and high purity systems from LEWA are a tried-and-tested solution in the pharmaceutical & biotechnology industry. We are happy to assist with your individual high purity system.
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Continuous metering of extremely small quantities with LEWA intellidrive
Minimum flow rates down to 1 ml/h: With LEWA intellidrive technology, we already have created solutions for many applications with very small flow rates.
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Oil-free CO2 cooling with LEWA pumps
LEWA diaphragm metering pumps provide a constant oil-free CO2 cooling of silicon sensors in particle physics research center CERN.
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Gas odorization in the natural gas distribution grid
At hubs in the gas distribution network, big amounts of natural gas are forwarded. LEWA odorization unit OD 4200 is able to odorize gas amounts of up to 1.000.000 m³/h.
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Adding antistatic agents to improve the conductivity of fuel
Antistatic additives or antistatic agents prevent the electrostatic charging of fuels which occurs due to the friction in the pipelines during transport. Use LEWA metering systems for this application!
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Adjustment of cleaning agent concentration for electronic components
LEWA metering systems adjust concentrations of cleaning agents for the immersion cleaning of electronic components.
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Dilution of emulsifiers
With its metering systems and diaphragm pumps, LEWA offers the right solution for recipe-compliant emulsifier dilution.
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Extracting omega-3 fatty acids using supercritical CO2
LEWA offers optimum pump solutions for these processes, which perform their tasks safe, permanently reliable and efficiently
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Production of creams
With its metering systems and diaphragm pumps, LEWA offers the right solution for recipe-compliant production of creams.
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Hydroconversion in refinery processes
With its remote-head metering pumps, LEWA offers the optimum solution for hydroconversion in refinery processes.
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Biogas odorization
The biogas odorizing systems from LEWA ensure a correct metering even with gas flow range of 150 Nm³/h with a gas pressure of up to 20 bar. Get in touch with our experts for your individual odorizing task!
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Fractionation
LEWA pumps and systems fulllfill necessary international standards and regulations for production in regulated industries (GMP)
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Sulfuric acid injection in copper heap leaching
LEWA process pumps are used to reinject sulfuric acid at 98% into the main pipelines that go to the heap leach sprinklers.
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Industrial refrigeration
With the NIKKISO Non-Seal canned motor pump, LEWA offers suitable solutions for cold storage, cooling and freezing.
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Dispersing
With the diaphragm metering pumps and streamlined suspension valves, LEWA offers the suitable solution for the metering of fluids with solid particles.
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Esterification
With LEWA process diaphragm pumps, as well as the NIKKISO Non-Seal canned motor pumps we offer the optimum solution for esterification.
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Additive dosing for fuels
LEWA supplies both diaphragm metering pumps and process diaphragm pumps for additive dosing in fuels. We provide you with the right pump and advice for your application.
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Solutions for flavor and color metering in the confectionery industry
LEWA creates custom-made, complete solutions that are ready to implement in your applications.
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Polymerization in EVA reactors with process pumps
Production of ethylene vinyl acetate (EVA) with LEWA process pumps. We provide you with the right pump and advice for your application.
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LEWA Lösungen für die Öl- & Gasindustrie. (DE)
High-end Dosier- und Prozesspumpen sowie Systeme und Packages für spezifische Funktionalitäten zum Einsatz in der On- und offshore Förderung.
4 MB
| pdf |
18.10.2022
LEWA Solutions for the Oil & Gas Industry. (EN)
High-end metering and process pumps as well as systems and packages for specific functions for use in onshore and offshore production.
4 MB
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18.10.2022
Poster LEWA ecoflow Pumpenkopf M900 (DE)
Poster LEWA ecoflow Pumpenkopf M900 (DE)
121 KB
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22.02.2019
Poster LEWA ecoflow Pumpenkopf M500 (DE)
Poster LEWA ecoflow Pumpenkopf M500 (DE)
137 KB
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22.02.2019
Poster LEWA ecoflow Schnittbild (DE)
Poster LEWA ecoflow Schnittbild (DE)
333 KB
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22.02.2019
Poster LEWA ecoflow pump head M500 (EN)
Poster LEWA ecoflow pump head M500 (EN)
439 KB
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22.02.2019
Poster LEWA ecoflow Pumpenkopf M200 (DE)
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275 KB
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22.02.2019
Poster LEWA ecoflow pump head M900 (EN)
Poster LEWA ecoflow pump head M900 (EN)
121 KB
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22.02.2019
Poster LEWA ecoflow pumphead M200 (EN)
Poster LEWA ecoflow pumphead M200 (EN)
627 KB
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22.02.2019
LEWA ecoflow maßgeschneiderte Dosierpumpen (DE)
LEWA ecoflow ist ein umfangreiches Baukastensystem für Membran- und Kolbenpumpen. Es kombiniert sieben Triebwerksgrößen mit sechs unterschiedlichen Pumpenköpfen.
3 MB
| pdf |
21.07.2024
LEWA ecoflow bombas dosadoras customizadas (PT)
A ecoflow LEWA é um extensivo sistema modular para bombas dosadoras de diafragma e de pistão.
Ela combina sete tamanhos de unidade com seis diferentes cabeças de bomba.
3 MB
| pdf |
18.02.2022
LEWA ecoflow custom-made metering pumps (EN)
LEWA ecoflow is an extensive modular system for diaphragm and packed plunger metering pumps.
It combines seven drive sizes with six different pump heads.
3 MB
| pdf |
21.07.2024
Soluciones de LEWA para la industria del petróleo y gas. (ES-SA)
Bombas de dosificación y de proceso de alto nivel, así como sistemas y paquetes para funciones específicas para su uso en producción tanto en la tierra como en el mar.
3 MB
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18.02.2022
LEWA Solutions for the Oil & Gas Industry. (USA)
High-end metering and process pumps as well as systems and packages for specific functions for use in onshore and offshore production.
4 MB
| pdf |
06.11.2022
Remote Head Konstruktionen für LEWA Pumpen
LEWA Remote-Heads. Entkoppelung vom Verdrängersystem für mehr Sicherheit.
1 MB
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18.02.2022
Remote Head Designs for LEWA pumps
LEWA remote heads. Disconnecting from the displacement system for more safety.
1 MB
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18.02.2022
LEWA process diaphragm pumps LEWA triplex and LEWA ecoflow for process engineering. (EN)
LEWA process diaphragm pumps set the standard for process engineering, allowing even critical, toxic, or flammable fluids to be conveyed safely.
4 MB
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21.07.2024
LEWA process diaphragm pumps LEWA triplex and LEWA ecoflow for process engineering. (USA)
LEWA process diaphragm pumps set the standard for process engineering, allowing even critical, toxic, or flammable fluids to be conveyed safely.
4 MB
| pdf |
18.02.2022
LEWA Prozess- Membranpumpen LEWA triplex und LEWA ecoflow für die Verfahrenstechnik. (DE)
LEWA Prozess-Membranpumpen setzen den Standard in der Verfahrenstechnik. Mit ihnen können selbst kritische, toxische oder brennbare Flüssigkeiten sicher gefördert werden.
4 MB
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21.07.2024
