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Neptune's technical innovations, backed by solid customer support, builds confidence in our complete portfolio of products, delivering peace of mind reliability to our end users.

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Neptune Markets

Single-source, end-to-end solutions

Neptune delivers pump systems for use in the reliable and safe handling of chemical fluids used for water treatment applications in municipalities, general industries and agriculture.

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500A 500-A-N3-5-Series-003

500-A Series

500-A Series Hydraulic Metering Pumps are Neptune's Simplex design. Neptune's Simplex design configuration includes a single micrometer dial with one liquid head. 500-A Series pumps cannot be converted to the Duplex design.

Liquid Head Materials of Construction
  • PTFE
  • FKM as standard (PTFE available)
  • 0.80 gph (3.03 L/h) to 18 gph (68 L/h)
Max Pressure
  • 1,100 psi (75.8 bar)
Max Temperature
  • 316SS - 200°F (93°C)
  • C-20 - 200°F (93°C)
  • PVC - 125°F (52°C)
Standard Motor
  • 1/3HP-1ph-115VAC-60c-TEFC

Features and Benefits

  • EZE-CLEAN™ Valves – feature cartridges that can be removed for cleaning without disturbing the piping to the pump
  • Ten turn micrometer dial calibrated in 1% increments, with the ability to adjust capacity from 10% to 100%
  • Variable Oil By-Pass™ Stroke Adjustment provides a better valve performance when compared to variable linkage designs
  • Bright color contrasted dial protected from corrosion by clear PVC Covering
  • Stroke mechanism moves only when adjustment is made, eliminating wear
  • Piston is powered through complete stroke length at all capacity adjustments, eliminating stress, wear and shock of lost motion designs
  • Totally enclosed fan-cooled motor with built-in automatic thermal overload