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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

    N990H-N26

    $2,276.30
    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 shaft by ...
  2. Oberdorfer Pumps

    Bronze Rotary Gear Pump w/ motor

    N990J-T47

    $3,624.13

    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...
    1-1/2HP 115/230v 1" Learn More
  3. Oberdorfer Pumps

    Bronze Rotary Gear Pump w/ motor & relief valve

    N990RJ-N96

    $2,483.00
    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...
  4. Oberdorfer Pumps

    Bronze Rotary Gear Pump w/ motor & relief valve

    N990RJ-T95

    $2,532.40
    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...
  5. Oberdorfer Pumps

    Bronze Rotary Gear Pump w/ motor & relief valve

    N990RK-Y95

    $3,205.80
    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...
  6. Hypro Pumps

    Cast Iron Gear pump

    GMCV6VC7

    $1,111.00
    Rotary Cast Iron Gear pump 1" with electric motor. 303 SS fasteners, steel gears.

    Adjustable relief valve designed for internal pressure relief, can be ported for either internal or external discharge. Do not operate the relief valve for more ...

    3HP 230v/1 ODP 1" Learn More
  7. Oberdorfer Pumps

    Bronze Cooling Gear Pump w/ relief valve

    N1000R-66

    $585.00
    Water-cooled induction heating systems / machine cooling Pump. Bronze Pedestal Gear pump with relief valve. Often used as a coolant pump Ameritherm, Dynaflux. Pump flow is reversible.
    • Gear pumps are positive displacement pumps. Each shaft re...
    Water-cooled induction heating systems / machine cooling Pump. Bronze Pedestal Gear pump with relief valve. Often used as a coolant pump Ameritherm, Dynaflux. Pump flow is reversible.
    • Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffected by the back pressure in the discharge line. Shaft speed and flow are directly proportional.
    • Learn More
  8. Hypro Pumps

    12V DC Cast Iron Gear pump

    GMCV4VA-12

    $1,253.00

    12 volt 12v DC Rotary Cast Iron Gear pump. 303 SS fasteners, steel gears. Battery powered self priming heavy duty gear pump.

    Adjustable relief valve designed for internal pressure relief, can be ported for either internal or external discharge. D...

    12vdc 1HP Learn More
  9. Hypro Pumps

    Bronze Gear pump only

    GMBN6V

    $1,051.82
    Rotary Gear pump end. 303 SS fasteners, Ryton gears.

    Adjustable relief valve designed for internal pressure relief, can be ported for either internal or external discharge. Do not operate the relief valve for more than one minute.

    Use for pres...

    No motor Learn More
  10. Oberdorfer Pumps

    Bronze Pedestal Gear Pump W Relief Valve

    N4000LRS3

    $911.30

    Bronze Pedestal Gear Pump With Relief Valve. Bronze Pedestal Gear pump. Often used as a oil pump on large ships to pre-lube the bearings, Chillers (Dynaflux) often used with welders. See performance chart for motor speed VS HP VS performance.

    • G...
    1/2" w/ relief valve Learn More
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