Chemical Pump - Durco Guardian Magnetic Drive

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Durco Guardian horizontal magnetic drive pumps offer simple, reliable, and leak-free performance in demanding transfer applications and emission-free services. This chemical pump complies with ASME (ANSI) B73.1-2001 dimensional standards, ASME (ANSI) B73.3-2003 sealless pump standards and HI 5.1-5.6 1992 standards. Guardian pumps use similar casing and reverse vane impeller as Durco Mark 3 ASME (ANSI) standard pumps, making it easy to convert from sealed to sealless configurations.



Durco Guardian ANSI Magnetic Drive Pump

FLOW UP TO 6,250 LPM (Liters per minute)
or 375 m3/hr
Pressures to 24 bar

Features & Benefits

  • Reverse vane impeller ensures constant bearing lubrication and lowest average NPSHR
  • Hastelloy ® C-276 Containment Shell with excellent corrosion resistance
  • Samarium Cobalt Rare Earth Magnets eliminate slippage
  • Rugged silicon carbide bushings and journals ensure longer service life
  • High-temperature capabilities of up to 290 C
  • Optimised lubrication flow paths for maximized cooling of bushings and journals

Available Options

Durco Guardian comes with a range of options to meet your application’s special requirements. Get in touch with our experts for more information.

  • External flush plan
  • Instrumentation options
  • Material options
  • Close-coupled and self-priming configurations
  • Labyrinth oil seals
  • Pump power monitor
  • Spare parts

Key Specifications

  • Flows to 375 m3/h
  • Heads to 215 m
  • Pressures to 24 bar


  • Acid transfer
  • Aquariums
  • Chlor-alkali
  • Corrosive services
  • Difficult-to-seal liquids
  • Flammable liquids
  • Organic chemicals
  • Polymers
  • Solvents
  • Toxic services
  • Ultrapure liquids
  • Valuable liquids
  • Water treatment


The Guardian is capable of handling service temperatures to 290°C (550°F). Stationary silicon carbide bushings are cartridge mounted using tolerance rings to compensate for thermal expansion. O-rings protect tolerance rings from corrosion. Cartridges are pre-assembled at the factory and slip-fit into the bearing holder.


The Guardian is available in a wide range of materials to suit application needs. The accompanying chart lists the most common materials of construction.


features a highly engineered internal lubrication path designed to deliver superior cooling and efficient pump performance. By introducing the coolest possible fluid to the bushings and journals, the Guardian achieves optimum lubrication, cooling and performance.


Industrial Chemical Pumps

In Durco Guardian mag drive pumps, fluid enters the impeller through the “eye” and is “centrifuged” (hence the name) to the impeller periphery. As the impeller rotates, it imparts kinetic energy onto the fluid. The impeller vanes have channels with an increasing flow path area. As the flow path area expands, the passing fluid’s velocity decreases and the pressure increases. The fluid then falls to the volute. Due to the unique shape of the volute casing, the fluid undergoes a further velocity decrease and pressure increase. This causes the liquid to be discharged through the discharge port.

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