Lee Mathews Equipment Inc./BRI (Cogent Companies) will be serving our customers locally providing authorized non-warranty repair services for Neptune pumps and mixers beginning July 25, 2016.  Mofilco welcomes them to our team.  Neptune equipment is expected to outlast the warranty period and Lee Mathews/BRI have been trained to service your equipment to keep it running like new.  Contact Mofilco for more information.

Neptune Letter of Authorization


Click here to contact Mofilco

How to Size and Select Your Metering Pump


Hydraulic Metering Pumps

Series 500 "dia-Pump"

neptune-500series bkgdCheck out our most popular and versatile Neptune pump, the 500 Series Neptune Hydraulically Actuated "dia-pump."  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.

The 500A Series is the Standard "dia-Pump" Simplex Only.

 Download 500A Series Literature


Metering Pumps - E Series "dia-Pump" - Economy Diaphragm Pump

Neptune 500-E Series Pump

Series 500-E offers an economical alternate to the standard Series 500 "dia-PUMP" or an opportunity to "step-up" from packed plunger pumps to a true hydraulic diaphragm pump at a modest cost increment.


  • Capacity to 34 gph (68 lph); Pressure to 1100 psi (77 kg/cm2)
  • Available liquid end materials: 316SS, PVC, Kynar®
  • Variable Oil By-pass™ stroke adjustment allows improved valve performance over variable linkage designs.
  • Capacity control options include electric stroke length adjustment and variable speed drives.

Download 500E Series Literature


The 500S/500D is the Original "dia-Pump" and is available both Simplex or Duplex.  The Simplex capacities range from 0.2 gph (0.75 lph) to 80 gph (302 lph) and pressures to 3000 psi (210 kg/cm2).

Download 500S Series Literature Download 500D Series Literature


Tubular Diaphragm Pumps

Special Application Pump

NeptuneTSeriesNeptune Series 500 tubular diaphragm pumps are engineered for viscous fluids up to 20,000 cP and for medium slurries up to 10% solids.
Design Features/Benefits

  • No-clog design. Straight-thru flow pattern eliminates pockets where slurries can settle.
  • Easily handles high viscosity liquids.
  • Double diaphragm is standard.
  • Capacities to 80 gph (302 lph).
  • Control options include electric stroke control and variable speed drives.
  • Standard units with double ball suction and discharge valves. Single ball suction valve is optional.
  • Variable Oil By-pass™ stroke adjustment mechanism provides better valve performance than variable linkage designs.
  • Viton elastomer withstands most chemicals.
  • Elastomer memory and tube shape reduce NPSH requirements, allow more viscous fluids to be pumped.

Download 500-T Series Literature


Series 600/6000 Series "dia-Pump"
Neptune 500 Series


  •  Designed for high-pressure, high-volume applications
  • Simplex or duplex models available
  • Variable Oil By-pass™ stroke adjustment
  • Hydraulically balanced Teflon® diaphragm eliminates stress
  • EZE-CLEAN™ valves are removable without disturbing piping
  • Optional electronic positioners or variable speed drives available for automatic
    capacity control
  • Power train operates submerged in oil for extended service
  • Pump capacity is adjustable via micrometer dial while pump is running or
  • Engineered for fluids with a viscosity to 1,000 cPs
  • Available with Totally Enclosed Fan Cooled (TEFC), Explosion Proof (EXP)
    and Chemical Plant Severe Duty (CPSD) motor enclosuresCapacities to 240 gph (908 lph)

Click here for a full line brochure on Neptune Hydraulic Series Pumps


Metering Pumps--Neptune Low Volume Pumps

Special Application Pump

Neptune5003LVTNeptune Model 5003/5005 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.

  • Design Features/Benefits
  • 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
  • Electric stroke-length control available -- automatic capacity control in response to standard 4-20 mA process signal (variable speed drives may not be used with Models 5003/5005 due to low stroking speed)
  • Explosion-proof motors available -- suitable for use in hazardous atmospheres
  • Low flow-rates–quarts/day -- accurate, reliable chemical feed

Download 5003S & 5005S Series Literature


Neptune High Viscosity Metering Pumps


Neptune500VSseriesNeptune high viscosity, flat diaphragm "V-Pumps" are designed to accurately meter viscous fluids up to 5000 cP such as polymers and other thick liquids.


  • Handles moderate viscosity fluids.
  • Standard flat diaphragm.
  • Large internal porting with a large, single ball, suction check valve.
  • Capacities to 29 gph (109 lph) at 100 psi (8 kg/cm2).
  • Available in all 316SS with SS trim.
  • Electric stroke control options and variable speed drives.
  • Variable Oil By-pass™ stroke adjustment mechanism provides better valve performance than variable linkage designs.
  • Teflon® diaphragm withstands most chemicals.

Variable Oil By-pass™ stroke adjustment allows an adjustable time delay between the end of the suction stroke and the beginning of the discharge stroke. This delay permits the ball to seat fully before pumping resumes, even in the heaviest liquids, so that pumping accuracy remains high.

Download V Series Literature


Neptune Mechanical "dia-Pumps"

Series MP7100 Mechanical "dia-Pumps"

PurposeNeptune 7000 Series Pump

The Neptune Series MP7100 "dia-PUMP" is a mechanically actuated diaphragm metering pump designed for water, wastewater and process applications.


The mechanical design eliminates the use of contour plates on the liquid side of the diaphragm. The simple, straight through valve and head design allows improved flow characteristics.

  • Self-priming
  • Superior performance when pumping chemicals such as sodium hypochlorite, which can off-gas
  • Suction lift exceeding 20 ft. on water-like chemicals
  • Easily handles viscosities in excess of 5000 cps
  • Maximum capacities range from 12 gph to 300 gph at 150 psi, depending on model
  • PVC, Kynar, and 316SS liquid ends available

Download MP7100 Series Literature


 Solar D™ Pump Series

Consistent Injection Rates from a Reliable Solar Pump

neptunesolarpumpTNeptune Solar D™ pump was developed via a joint engineering effort with our sister company, Ferguson Beauregard, part of Dover Corporation. This effort resulted in an innovative solar powered chemical injection pump for feeding a wide variety of chemicals into remote oil and gas wells where electrical power is unavailable. The Neptune Solar D is engineered to meet the needs voiced by the industry.


  • Reduce field service and downtime
  • Maximize chemical containment
  • Precise and consistent injection rates at pressures up to 1,200 psi (83 bar)


  • Sealed brushless non-sparking DC motor
  • Corrosion resistant 316 SS and PTFE standard on chemical end
  • Solar powered ideal for use in remote areas
  • Hydraulically balanced diaphragm design to reduce wear
  • Seal-less design to prevent leaks
  • Durable with few moving parts and no dynamic seals
  • Easy maintenance
  • Reduced complexity minimizes downtime and inventory requirements


  • Max Injection Pressure - 1200 psi (82.73 bar)
  • Max Output - 45 GPD (170.64 L/day)*

*Typical solar panel configurations allow only up to 10 GPD. Special solar panel configurations will be required if higher rates are necessary.

Download Solar D Pump Literature


Electronic Pumps

Neptune PZ Pulse Metering Pumps

Neptune PZ PumpElectronic diaphragm pulse metering pumps are rugged, reliable and easy to install and operate.


  • Operates on any single phase voltage from 94 VAC to 264 VAC.
  • Manual, 4-20 mA or water meter pulse controlled.


  • State of the art control and programmable features
  • Accuracy unaffected by voltage fluctuation
  • 300 strokes per minute allow more uniform distribution at all feed rates
  • Superior degassing head

More information on Neptune Electronic Pumps

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