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Engineered To Meet the Most Exacting Specifications... Yours.

GRI has been advancing the development of fluid pumping solutions for over half a century. Along the way, we’ve developed an extensive product line of cutting-edge pumping solutions for a wide array of industries and applications. But that truly is just the beginning.

Built with advanced materials, motors and methods, our high-quality, innovative pump lines are simply the perfect platform from which we create customized solutions. As your pump partners, GRI works in close collaboration with you and your team, evaluating your application and creating tailor-made, turnkey solutions built specifically to meet your specialized needs and requirements.

Our Begin Your Build engine enables you to get a jump on the process, helping us to quickly identify the appropriate category and product family from which we can begin to craft your perfect pump.

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Your Pumping Solutions.

Begin Your Build is a starting point to a solution specific to your application. The page results may not reflect all of your OEM variables. Please contact GRI to begin the discussion of your solution in more detail.

Standard Bellows Metering Pumps

Product Overview

The Standard Bellows Metering Pumps operate on a positive displacement principle. The rotation of the motor shaft is transmitted into an up and down motion through a lever pivot crank mechanism. This motion provides a continuous compression and expansion force on a bellows module, forcing fluid in and out of the module. Discharge pressure is maintained over the entire flow range of the pump.

Standard Bellows Metering Pumps are designed to displace both corrosive and non-corrosive fluids. Accurate to ± 0.5% from stroke to stroke, when pump is set 50% to 100% of full stroke. Discharge pressure is maintained over the entire flow range of the pump. Poppet valves are used to prevent backflow; and springs are available to provide a positive shutoff, preventing siphoning through the pump in applications where a positive suction head exists.

Bellows pumps utilize GRI’s proven proprietary blend of polypropylene materials to provide an accurate and economical, long-lasting metering pump. A wide selection of valve and O-Ring elastomers produce chemical resistance pumps capable of handling both corrosive and non-corrosive fluids.

For a complete description of our Standard Bellows Metering Pumps, including performance, options, replacement kits, and dimensional drawings, please click the blue "Pump Overview & Data Sheet" button.

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Product Details

Applications include, but not limited to:

  • Film and x-ray processors
  • Silver recovery systems
  • Wafer and silicon chip washers and processors
  • Detergent dispensers
  • Blood analyzing equipment
  • Industrial floor scrubbers
  • Thermo therapy equipment
  • Waste removal systems
  • 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).
Note: 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. Heavy slurries should be flushed from the pump before shutdown.

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.

Optimum operating conditions consists of a 6″ minimum suction lift and a discharge head of not less than 6″. Pumps must be mounted vertically with the valve body at the top to obtain maximum metering accuracy.

Catalog gearmotors are available in 115V, 50/60 Hz or 240V, 50/60 Hz. Standard motor speeds are 39, 60, 90 and 165 RPM at 60 Hz. Motors are UL listed and continuous duty rated with a minimum life expectancy of 2000 hours. Perpetual running of motor is not recommended. If a non-stop application is encountered, the Gorman-Rupp Industries Heavy-Duty Bellows Metering Pump is recommended.