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Durable, flexible, and efficient internal gear pumps that excel in challenging fluid-handling applications.
Available in jacketed and non-jacketed construction, these pumps are excellent for transferring fluids with a wide range of viscosities where consistent, non-pulsating flow is required. A wide portfolio of sizes and options are available.

Blackmer G Series Internal Gear Pump

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Blackmer® G Series Internal Gear Pumps


Right Angle (90°), Opposite (180°) (G1 / G2-222), NPT / BSP, or ANSI flanged
Cast iron, carbon steel, stainless steel
Max temperature
650°F (343°C)
15 gpm to 500 gpm (3.4 m³/h to 113.6 m³/h)
Max pressure
Cast iron – 200 psi (13.8 bar); carbon steel – 200 psi (13.8 bar); stainless steel – 150 psi (10.3 bar)


  • Single-Point End-Clearance Adjustment: A threaded bearing housing allows the rotor end clearance to be adjusted with simple hand tools
  • Seal Chamber with Universal Design: An oversized bracket and seal chamber allows the acceptance of numerous sealing technologies
  • Heavy-Duty Oversized Bearing Housing: The cast-iron bearing housing is guaranteed to last the life of the pump
  • Materials of Construction: Wetted parts are available in cast iron, carbon steel and stainless steel
  • Flexible Case Orientation: Bidirectional performance for loading/unloading; ability to rotate in 45° increments
  • Internal Clearance Options: Available to offer optimal performance in a wide range of applications
  • Hardened Idler Pin: Standard on all sizes with multiple materials of construction available
  • Pressure Relief Valve: Multiple options are available to protect the pump from over-pressure
  • Pumps can also be ordered without a pressure relief valve
Contact our pump experts to help guide your selection process and address proper sizing and materials.