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Series 500 Metering Pumps

Variable Oil By-pass™ stroke adjustment allows better valve performance than variable linkage designs. The valve checks have extra time to seat even in heavy liquids since they are idle during the by-pass portion of the suction and discharge strokes.

EZE-CLEAN™ Valves–Cartridges can be removed for cleaning without disturbing the piping to the pump.

All Neptune "dia-Pumps" are adjustable from 10% through 100% of capacity by micrometer dial.

Neptune "dia-Pumps" are available in the following materials of construction:

  • Cast Iron with 316SS Trim
  • 316SS
  • PVC
  • Alloy 20
  • Kynar

Standard “dia-Pump” Simplex Only

• Simplex capacities from
1 gph (3.7 lph) to 18 gph (68 lph)

• Pressures to 1100 psi (77 kg/cm2)

Economy Liquid Head Simplex Only

• Simplex capacities from
1 gph (3.7 lph) to 18 gph (68 lph)

• Pressures to 1100 psi (77 kg/cm2)

The Original “dia-Pump” Available Simplex or Duplex

• Simplex capacities from
0.2 gph (0.75 lph) to 80 gph (302 lph)

• Pressures to 3000 psi (210 kg/cm2)