Compact Bellows Metering Pumps

Featured Product from GRI Pumps (A Gorman-Rupp Company)

More Info Email Supplier Request A Quote

Compact Bellows Metering
Gorman-Rupp Industries' line of Compact Bellows Metering Pumps were specifically designed for metering applications requiring low discharge pressures. Compact pumps have been successfully applied in photo, X-ray and dental film processors; silver recovery; and scientific and analytical instruments.

The compact bellows 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.

Compact Bellows Metering Pump Operation:
The Compact 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 an adjustable 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. Up to four separate bellows modules can be operated by single motor for proportioning up to four separate fluid mediums. The flow rate of each module is independently adjustable. Multiple bellows modules operate out-of-phase with each other for most efficient power usage.

Compact Bellows Metering Pump Specifications:

  • Flow Rates - Range from 3.8 ml/min to 1620 ml/min, Tandem flow rates to 3,000 ml/min.
  • Max Discharge Pressures - Range from 5 to 30 psi depending on bellows size and pump configuration.
  • Max Fluid Temperature - To 140°F (60°C)


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.


OEM Applications:

  • Photo, X-ray and dental film processors
  • Silver recovery
  • Medical, scientific, and analytical devices



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


Watch>>>About GRI Pumps (A Gorman-Rupp Company)

Since 1953: Not Just Pumps, Pumping Solutions
There are many variables that must be considered when specifying a magnetic drive pump for an OEM application. At first glance you may not find a pump that meets your exact requirements. GRI recommends that you contact our Technical Sales Staff to discuss your project so that the right pump can be specified. Many times we will customize an existing pump to meet your needs or design a new pump according to your system’s exact specifications.

The Importance of Specifying a Pump Early in the OEM Design Process
Check out GRI’s “Emphasis On Pumps” article in the October 2013 issue of MDT magazine.  Knowing the specific fluid pumping requirements of an application upfront in the development process is important. Unfortunately many device and system designers neglect to consider the fluid pumping requirements until late in the design process.

Many times a designer will have to perform costly alterations to systems or devices to make their design compatible with a pump chosen late in the design process. Being that many times a pump is the “heart” of a system, it makes sense to begin the specification process early rather than later. Careful planning saves not only time and money, but also headaches. 

Fluid pumps for the Original Equipment Market
Serving the Original Equipment Manufacturer since 1953, Gorman-Rupp Industries’ reputation and success have been built on innovative fluid pump designs, customer service, and providing products to meet the exact specifications of our customers.

GRI’s fluid pumping knowledge and expertise comes from working with domestic and international partners in a variety of markets and OEM applications for over 60 years. Whether it is replacing an existing pump or working with you on a new OEM fluid pumping application, GRI’s proven concepts and engineered designs will provide a unique solution to your fluid pumping dilemma.

Custom Design and Manufacturing of fluid pumps for the OEM market, Bellows Metering Pumps, Magnetic Drive Pumps, Centrifugal Pumps, Oscillating Pumps, Gear Pumps, OEM Pumps