Neptune Series 500 Low Volume Metering Pumps

Neptune Low Volume hydraulic diaphragm metering pumps are built to deliver very low flows, repeatable and accurate ranging down to quarts per day. Discharge pressures are higher than are possible with mechanical diaphragm pumps. Explosion-proof models are available for use in hazardous atmospheres.

These pumps are especially popular in oil/gas production, oil recovery and refineries. Typical applications include the injection of antifoam agents, corrosion inhibitors and other additives injected at very low volumes but high pressures. These pumps are also used for neat feeding of boiler chemicals.

Features:

High discharge pressures, to 3000 psi (210 kg/cm²). Exceeds limits of most small pumps, ideal for high pressure systems
EZE-CLEAN™ valves – Cartridges can be removed for cleaning without disturbing piping
Pneumatic and electric stroke-length control available. Automatic capacity control in response to standard 4-20 mA process signal*
Explosion-proof motors available, suitable for use in hazardous atmospheres
Low flow-rates – quarts per day. Accurate, reliable chemical feed

Specifications are given below, or you can download product information for the Series 500 Low Volume line (PDF format) here:

Data Sheet (specifications, performance charts & dimensions)

Series 500 Low Volume Specifications

Model Number	Capacity @ 100 PSI		Materials of Construction	Pressure @ 1/3HP		Pressure @ 1/2HP		Strokes Per Minute
Model Number	Capacity @ 100 PSI		Materials of Construction	psi	kg/cm²	psi	kg/cm²	Strokes Per Minute
481-S-N3	0.2 gph 4.8 gpd	0.75lph 17.8 lpd	316 SS	1500	105	n/a	n/a	18
501-S-N1	0.5 gph 12 gpd	1.9 lph 44 lpd	Cast Iron	1500	105	n/a	n/a	18
501-S-N3			316 SS	1500	105	3000	210
501-S-N4			C-20	1500	105	3000	210
501-S-N5			PVC	150	10.5	n/a	n/a

Notes:
Variable speed drives may not be used with models 481 or 501 due to low stroking speed.
501 models are available in simplex or duplex. 481 model is available as simplex only.
Use with flooded suction only.