Bellows Metering Pumps


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Product Overview

GRI’s Bellows Metering Pumps utilize GRI’s proven bellows and valving technology to provide an accurate and economical metering pump with long life. The proprietary blended polypropylene materials of construction and a wide selection of valve and O-ring elastomers produce chemical resistant pumps capable of handling a wide range of fluids.

Bellows Metering Pumps were specifically designed for metering applications requiring low discharge pressures. Bellows pumps have been successfully applied in photo, X-ray and dental film processors, silver recovery systems, scientific and analytical instruments, wafer and silicon chip washers and processors, detergent dispensers, blood analyzing equipment, industrial floor scrubbers, thermal therapy equipment, waste removal systems, and wastewater and water treatment systems.


Flow Rates: Range from 3.9 ml/min to 3000 ml/min, depending on pump configuration, gearmotor speed and stroke length.

Max. Discharge Pressures: Range from 5 to 50 psi depending on bellows size.

Max. Fluid Temperature: To 140°F (60°C). Reduce pressure rating by 50% for fluid temperatures over 120°F (49°C).

Viscosity/Slurries: Maximum fluid viscosity is 5,000 centistokes. Poppet valves can handle fine slurries. Duckbill valves are recommended for heavy slurries or fibrous materials.
Materials in Contact with Solution

  • Connectors – Polypropylene.
  • O-Rings (Elastomers) – EPT/EPDM, or Viton®/Fluoroelastomer.
  • Poppet/Duckbill Valves – EPT/EPDM, or Viton®/Fluoroelastomer.
  • Bellows – Standard Polypropylene Materials.

Additional materials available, Contact GRI.


  • Repeatability from stroke-to-stroke to ± 0.5%
  • Self-priming
  • Corrosion resistant
  • Long life
  • Dry run capability
  • No dynamic seals
  • Maintenance free operation
  • Simple flow adjustment
  • Multiple OEM options

Click link for series information> Standard Compact Mini Pocket Dosing
Flow Rates 3.9 to
3000 ml/min
3.8 to
1620 ml/min,
Tandem Max flow 3,000
Max flow
270 ml/min,
Tandem Max flow 432
2.7 to 240 ml/min 3.3 to 43.2 ml/min
Max Discharge Pressure 5 to 50 psi 5 psi 5 psi 5 psi 5 psi
Max Fluid Temperature 140°F (60°C) 140°F (60°C) 140°F (60°C) 140°F (60°C) 140°F (60°C)
Max Fluid Viscosity 5,000 centistokes 5,000 centistokes 5,000 centistokes 5,000 centistokes 5,000 centistokes
Crank Standard, BEL O JUST® Standard Standard Fixed Fixed
Module Count/Fluids Dependent on Series Up to four Up to two One One
Click pump image for a printable Product Overview Sheet and
Pump Selection Guide.
standardbellows_thumb compactbellows_thumb minibellows_thumb pocketbellows_thumb dosingpumps_thumb