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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.
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Mini Bellows Metering Pumps
Mini Bellows Metering Pumps are ideal for low flow, low pressure metering applications. Gorman-Rupp Industries’ line of Bellows Metering Pumps were specifically designed for metering applications requiring low discharge pressures. 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.
The Mini 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 two separate bellows modules can be operated by a 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.
For a complete description of our Mini Bellows Metering Pumps, including performance, options, replacement kits, and dimensional drawings, please click the blue "Pump Overview & Data Sheet" button.
Average Repeatability: From stroke-to-stroke ± 0.75%. Flow Rates: Range to 270 ml/min, Tandem models range to 432 ml/min. Max. Fluid Temperatures: To 140°F (60°C). Note: Reduce pressure rating by 50% for fluid temperatures over 120°F (49°C). Max. Discharge Pressure: To 5 psi. 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
No dynamic seals
Superior corrosion resistance
Simple flow adjustment
Optimum operating conditions consist of a 6” minimum suction life 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 Mini Bellows Metering Pumps Product Overview.
The standard motor available for the Mini Bellows 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.