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Positive Displacement Pumps

These pumps are often thought of as high-pressure pumps. Their positive displacement of fluid and fixed volume are the result of the fluid being mechanically moved through their pump passage on a regular cycle. This means that regardless of the system they discharge into, the pressure and volume will remain constant. The power of the driving device and its speed, limit the volume and pressure.Positive Displacement pumps:Flow rates of GPD, CC/min to 100 GPM typically.Discharge pressures of a 1 to 1000 PSI.Low speed and fixed volume per cycle, they handle very viscid fluids well.Smaller than centrifugal pumps.Quiet, do not ad much heat to the fluid, suitable for shear sensitive fluids.Diaphragm pumps can easily pass solids, stringy and fibrous foreign matter. Are made in materials from CI to Titanium and PP, PVDF and PPS engineering resins.
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  1. Oberdorfer Pumps

    Bronze Rotary Gear Pump w/ motor & relief valve

    N990RH-M46

    $2,114.00
    Oberdorfer Close coupled bronze rotary gear pumps.
    • Bronze Construction with SS shaft
    • Helical gears for quiet operation
    • Self-lubricating carbon bearings
    • O-ring seal for max. leak protection
    • The pump drive shaft is connected to the motor shaf...
  2. Flojet Pumps

    Duplex Diaphragm pump

    G573218

    $280.00
    Glass filled Polypropylene double diaphragm pump with FKM diaphragms and check valve seats. Springs are Hastalloy.

    Connections are 1/2" HB straight. Air connection 1/4” (6.4 mm) Plastic Hose Barb

    Used with all sorts of cleaning chemicals an...
  3. Oberdorfer Pumps

    406M Macerator Pump

    406M-04N26

    $1,397.00
    Sewage transfer macerator chopper pump with rubber impeller. Portable all bronze construction. Commercial heavy duty waste pump for pumping out RV, Boat sewage holding tanks. This model does NOT have the optional vacuum switch.
  4. Oberdorfer Pumps

    3/4" Bronze gear pump 1HP

    N970H-N75

    $2,659.00
    3/4" Bronze rotary gear pump without relief valve and close coupled to a 1 HP 12VDC 1725 RPM motor. Often used to pump Diesel fuel. Pump housings and gears are made of top quality bronze, shafts are stainless steel 303. Bearings are made of high ...
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  5. All-Flo Pumps

    PP Air Operated Double Diaphragm Pump Bolted Series

    A050-SPP-VVPV-S70

    $831.73
    PolyPro Air AODD Pump 1/4". Lube-free air valve, Non-stalling, No vent holes for corrosive fumes to get into, All plastic air system are corrosion resistant. Non-electrical. For handling large size solids order the Max-pass valve under accessor...
  6. All-Flo Pumps

    PP Air Operated Double Diaphragm Pump Bolted Series

    PB-10

    $1,138.16
    PolyPro Air AODD Pump 1". Lube-free air valve, Non-stalling, No vent holes for corrosive fumes to get into, All plastic air system are corrosion resistant. Non-electrical. Click here to Learn How to Size your Diaphragm Pump and for a Material...
  7. Oberdorfer Pumps

    3/4" Bronze gear pump 1HP

    N970RH-N75

    $2,689.00
    3/4" Bronze rotary gear pump with relief valve and close coupled to a 1 HP 12VDC 1725 RPM motor. Often used to pump Diesel fuel. Pump housings and gears are made of top quality bronze, shafts are stainless steel 303. Bearings are made of high per...
    12vdc Relief Valve Learn More
  8. Oberdorfer Pumps

    12vdc Bronze Rotary Gear Pump w/ relief valve

    N991R-32A96

    $658.00
    Bronze gear pump 12v. Pump housings and gears are made of top quality bronze, shafts are 303 stainless steel. Bearings are designed of high performance carbongraphite material selected for wear resistance and long service life. Gear pumps are pos...
    12vdc 1/4HP Learn More
  9. Oberdorfer Pumps

    DC Bronze Rotary Gear Pump w/ relief valve

    N991R-32C81

    $1,427.00
    Pump housings and gears are made of top quality bronze, shafts are 303 stainless steel. Bearings are designed of high performance carbongraphite material selected for wear resistance and long service life. Gear pumps are positive displacement pum...
    12VDC 1/4 Learn More
  10. Oberdorfer Pumps

    Close Coupled Bronze Rotary Gear Pump

    N999Q-F09

    $1,009.00

    Features N999 Series:

    • Compact design eases installation and use in limited space areas.
    • Construction is bronze and stainless steel wetted components.
    • Close tolerance design allows for consistent performance
    • Helical gears for quiet operatio...
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