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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

    2" Bronze gear pump

    N26HDM

    $6,488.30
    Long coupled gear pump made of cast bronze. If used above 900 RPM with non-lubricating fluid, then duty cycle is limited to intermittent.

    Continuous duty on lubricating liquids like oils. Use slower speed motor at lower flow rates for water an...

    up to 170GPM Learn More
  2. Riverside

    2" B&S 550 Diaphragm Pump

    DP2B

    $1,442.00

    Riverside Pumps' rugged and reliable Diaphragm Pumps are sometimes called "mudhogs" for their ability to pump heavy mud and sludge, thicker than any centrifugal pump can handle. They also have the advantage of being able to run dry without damage,...

    3.5HP diaphragm pump Learn More
  3. Tsurumi

    Diaphragm Trash pump

    TD4-200

    $2,275.00
    Diaphragm mud trash pumps. Honda powered diaphragm trash pumps are designed to be reliable, easy to start, easy to prime, easy to maintain and are built to last. QUALITY 4-STROKE Honda GX ENGINES with OHV, and a transistorized pointless ignition ...
    Honda 4HP GX120 Learn More
  4. All-Flo Pumps

    Stainless Steel Air Operated Double Diaphragm Pump

    A200-C33-TT3T-B70

    $14,179.59

    Stainless Steel AODD Pump 2". Lube-free air valve, Non-stalling, No vent holes for corrosive fumes to get into, All plastic air system are corrosion resistant. Non-electrical. 316SS 2" connections are dual FNPT and Flange (ANSI 150#/DIN) design.

    ...
  5. All-Flo Pumps

    Stainless Steel Air Operated Double Diaphragm Pump

    SE-20

    $9,874.74

    2" Stainless Steel Air Operated Double Diaphragm Pump 2". FDA Santoprene diaphragm. Lube-free air valve, Non-stalling, No vent holes for corrosive fumes to get into, All plastic air system are corrosion resistant. Non-electrical. 2" connections ar...

    316SS, Santo, EPDM 2" Learn More
  6. All-Flo Pumps

    PolyPro 2" Diaphragm Pump

    PT-20

    $7,899.81

    PolyPro 2" Diaphragm Pump, old PT-20. 2" Lube-free air valve, Non-stalling, No vent holes for corrosive fumes to get into, All plastic air system are corrosion resistant. Non-electrical.

    Models available in PP, PVDF, Nylon, Conductive Nylon, Al a...

    Teflon diaphragm Learn More
  7. All-Flo Pumps

    PolyPro 2" Diaphragm Pump

    PE-20

    $6,596.64
    PolyPro 2" Diaphragm Pump, replaces PE-20. 2"Lube-free air valve, Non-stalling, No vent holes for corrosive fumes to get into, All plastic air system are corrosion resistant. Non-electrical. Models available in PP, PVDF, Nylon, Conductive Nylon...
    Santoprene diaphragm Learn More
  8. All-Flo Pumps

    PVDF Air Operated Double Diaphragm Pump

    KN-20

    $16,116.14

    PVDF Air Operated Double Diaphragm AODD Pump 2". Was KN-20 All-Flo prior to new model numbering system. Fluid chambers are PVDF Kynar, Intermediate body is Polypro.

    Lube-free air valve, Non-stalling, No vent holes for corrosive fumes to get into,...

  9. PumpBiz

    WOBBLE STATOR PUMP & 3 PHASE MOTOR

    APM-67CSQM-3

    $5,354.02
    Liberty Pumps are backed by over fifty years of progressive cavity pump product sales and technical service experience. American Pump Series Progressive Cavity Pumps are designed with a singular helical rotor that eccentrically turns within a dou...
  10. PumpBiz

    WOBBLE STATOR PUMP & 3 phase MOTOR

    APM-67CSBM-3

    $6,217.58
    Liberty Pumps are backed by over fifty years of progressive cavity pump product sales and technical service experience. American Pump Series Progressive Cavity Pumps are designed with a singular helical rotor that eccentrically turns within a dou...
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