- Model Series 900 - Lowest Flow Hydraulic Diaphragm Metering Pump

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Designed from the ground up for high pressure–low flow applications, AquFlow’s Series 900 is the lowest flow hydraulic diaphragm metering pump on the market, with flows down to 0.01 GPH (less than 40 mL/hr). Made in compliance with API 675, the Series 900 can pump flow capacities up to 6.5 GPH at pressures as high as 3,000 PSI.

Aquflow delivers customized solutions for your choice of model depending on your application, whether it’s in oil & gas, pharmaceutical, food, or other chemical dosing industries. With a turndown ratio of 10:1, the Series 900 delivers a metering accuracy of ±1% with options for manual and auto capacity controls.

Like all AquFlow pumps, the Series 900 comes equipped with a built-in internal safety relief valve to prevent over pressurization. Its gear drive is fully enclosed and bathed in oil, reducing friction and protecting the internals of the pump from harsh environments. This low-maintenance and long-lasting design makes AquFlow’s Series 900 one of the most reliable and efficient low flow metering pumps.

Flow Capacity Up to 6.5 GPH (Duplex)
Pressure Up to 3,000 PSI
Design Modular design in aluminum housing
Metering Accuracy +/- 1%
Capacity Controls Manual/Auto
Safety Built-in internal relief valve
Availability Duplex or Double Flow Capacity
Liquid Handling Able to handle difficult liquids like slurries, off-gasing, high viscosities

Flow Capacity Adjustment 0–100% while the pump is running or stopped

Turndown Ratio

  • Stroke Length 10:1
  • Stroke Frequency 10:1
  • Combined 100:1

Metering Accuracy

  • Steady State: ± 1%
  • Linearity: ± 1%
  • Combined: ± 1%

Max. Process Fluid Temp.

  • Custom engineered metallic liquid end: 500°F
  • Metallic liquid end/PTFE diaphragm: 250°F (121°C)
  • Plastic Head: 140°F (60°C)

Plunger Stroke Length –
Hydraulic Oil Capacity –

Displacement Per Stroke (by plunger size)

  • 3/16' 0.0207 cu. in. (0.33 ml)
  • ⅜' 0.0828 cu. in. (1.35 ml)
  • ¼' 0.0368 cu. in. (0.60 ml)

Liquid End Material Options 316 SS, Alloy 20, Hastelloy C, PVC, PVDF and PTFE

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