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Edur

Edur is a specialized German manufacturer of special centrifugal pumps that has been delivering innovative pump solutions since 1928 for industrial applications where standard pumps fall short. The company Edur-Pumpenfabrik Eduard Redlien GmbH & Co. KG, based in Kiel, has built an internationally recognized reputation as a developer of multiphase pumps and high-pressure multistage pumps for demanding process environments.

Edur's production program is distinguished by the VBU series multistage pumps specifically developed for transporting liquids at high back pressure. The VBU pumps are constructively built from multiple radial stages that pressurize the fluid step by step, achieving outlet pressures of 40 bar and higher. The pumps are available in stainless steel 316L as standard material, and are supplied on request in duplex steel and special nickel-base alloys such as Hastelloy for aggressive and corrosive media.

A particular specialty of Edur are the multiphase pumps with which gas-liquid mixtures with gas fractions up to 50 percent by volume can be reliably transported. These pumps are used in applications where gas is dissolved in the liquid or present as free bubbles, such as water treatment installations, gas stripping, and chemical reactor cooling. The special rotor-stator geometry of Edur multiphase pumps prevents cavitation and loss of priming capacity at varying gas fractions.

In addition to the VBU multistage series, Edur supplies self-priming centrifugal pumps for low-NPSH applications, hot water circulation pumps for temperatures up to 180 degrees Celsius, and integrated pressure booster systems with frequency inverter for variable flow. The pumps find application in the chemical process industry, the shipping industry, offshore platforms, water treatment installations, and pharmaceutical production environments.

Verkopershulp.nl supplies a complete range of original Edur spare parts, including impellers for all VBU stages, mechanical shaft seals in various material versions, bearings, pump housings, intermediate pieces, and overhaul kits. With the correct nameplate data, our specialists can identify the exact parts for your specific Edur pump, ensuring revision and maintenance proceed quickly and effectively.

History

Edur-Pumpenfabrik Eduard Redlien GmbH & Co. KG was founded in 1928 in Kiel, Germany, by Eduard Redlien. From its founding, the company focused on developing special centrifugal pumps for applications where standard pump constructions performed insufficiently. In the decades after the Second World War, Edur developed the multiphase technology enabling transport of gas-liquid mixtures, an innovation that found broad application in the chemical industry and shipping. The VBU series multistage pumps became an internationally recognized standard for high-pressure liquid transport in heavy process industries. Edur today exports to more than 60 countries and supplies leading chemical companies, shipyards, and water treatment companies worldwide.

Product Categories

  • Centrifugal Pump
  • Coupling
  • Impeller
  • Pump
  • Seal & Gasket

Applications

  • Chemical process industry high-pressure transport
  • Offshore platforms and marine installations
  • Water treatment and reverse osmosis
  • Gas-liquid multiphase transport
  • Hot water circulation HVAC and steam installations
  • Pharmaceutical production and CIP installations
  • Industrial cooling water systems
  • Condensate drainage steam boilers
  • Drinking water production and desalination
  • Food and beverage production

Frequently Asked Questions

What makes Edur VBU multistage pumps suitable for high pressure?
The Edur VBU series is a multistage radial centrifugal pump where multiple pump stages are connected in series. Each stage increases pressure incrementally, achieving outlet pressures from 20 to more than 40 bar at relatively compact pump dimensions. The staged construction makes the pump suitable for long-term operation at high back pressure without overloading.
What gas fraction can an Edur multiphase pump handle?
Edur multiphase pumps can transport gas-liquid mixtures with gas fractions up to approximately 50 percent by volume, depending on pump type and operating point. Unlike standard centrifugal pumps, which already show cavitation problems at gas fractions above 5-10%, Edur multiphase pumps remain stable and maintain their flow and head at varying gas composition.
Which material options are available for aggressive media?
Edur pumps are standard available in stainless steel 1.4408 (316L). For stronger chemical aggressiveness, versions in duplex steel (1.4517), super-duplex, Hastelloy C276, and other nickel-base alloys are available. The choice of material depends on the pump medium, concentration, temperature, and presence of chlorides or other aggressive components.
How do I order the correct impeller for my Edur pump?
Note the complete pump type from the nameplate, including series designation (e.g. VBU 80/3-2G), year of manufacture, and serial number. With this information our specialists can select the exact impeller, the correct shaft seal, and other wear parts from the Edur spare parts program. Preferably also send a photo of the nameplate for error-free identification.
Are Edur pumps suitable for food applications?
Yes, Edur supplies centrifugal pumps in hygienic design with FDA-compliant materials and smooth internal surfaces conforming to EHEDG guidelines for the food industry. The pumps are cleanable via CIP and SIP procedures. Contact us for specifications of the available EHEDG-certified versions.
What are the temperature limits of Edur hot water pumps?
Standard Edur hot water pumps are suitable for liquid temperatures up to 120°C. In special configuration with high-temperature shaft seals and adapted bearing specifications, Edur pumps are available for temperatures up to 180°C. For temperatures above 120°C, the connecting piping and foundation must also be designed for thermal expansion.
Does Verkopershulp.nl also supply complete overhaul kits for Edur pumps?
Yes, Verkopershulp.nl supplies complete overhaul kits for common Edur pump types, including all mechanical shaft seals, O-rings, gaskets, and wear rings replaced during a full overhaul. The kits are assembled based on pump type and series designation, ensuring you have the correct parts for your Edur pump.
Can Verkopershulp.nl also supply complete new Edur pumps?
Yes, in addition to spare parts, Verkopershulp.nl also supplies complete new Edur pumps. Specify your desired flow in m³/h or l/min, the required head or outlet pressure in bar, the pump medium, temperature, and desired motor supply (400V 50Hz). Our pump specialists select the optimal pump and motor from the Edur supply program.