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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.

Pocket Bellows Metering Pumps

Product Overview

Pocket Bellows Metering Pumps are the most economical metering pump on the market while maintaining the high quality standards of a Gorman-Rupp Industries product. Pocket Bellows are ideal for low flow, low pressure metering applications where a fixed flow rate is required.

The Pocket Bellows Metering Pumps operate on a positive displacement principle. The rotation of the motor shaft is transmitted into an up and down linear motion through a concentric crank mechanism. This motion provides a continuous compressing and relaxing force on the bellows module, forcing fluid between two check valves located in the module’s valve body.

Like the Mini Bellows Metering Pump line, the Pocket Bellows are constructed of plastic and uses GRI’s time-proven bellows technology. Pocket Bellows provide OEMs with an accurate, chemically-resistant, long-lasting metering pump at an economical price. The only difference between the Mini Bellows and the Pocket Bellows is that the Pocket utilizes a fixed crank mechanism.

For a complete description of our Pocket Bellows Metering Pumps, please click the blue "Pump Overview & Data Sheet" button.

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data sheet
Pump Overview &
Data Sheet

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 2.7 ml/min to 240 ml/min.
Max. Discharge Pressures: Range to 5 psi.
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.

  • Average repeatability from stroke-to-stroke, ±0.75%
  • Dry run capability
  • Self-priming
  • No dynamic seals
  • Superior corrosion resistance
  • Economical
  • Simple flow adjustment

Optimum operating conditions consist 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. For conditions where a positive suction head condition exists, an anti-siphon spring or anti-siphon spring kit can be added to aid the poppet valve seal properly during operation. See Accessories section located in the Pocket Bellows Product Overview.

The standard motor available for the Pocket Bellows Metering Pump is an AC voltage synchronous motor. Motors are UL recognized and continuous duty rated and are available in 115V, 50/60 Hz or 230V, 50/60 Hz.

GRI PUMPING SOLUTIONS