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Rotary Pumps - Gear, Flexible Impeller, Screw

These pumps have a set of rotating gears, flexible impellers, screw rotor or vanes connected to a driven shaft. Therefore most of these pumps incorporate a mechanical seal, packing or lip seal along the shaft at its back end in order to keep the fluid from leaking along the shaft. There are a few models, which are magnetically coupled and thus seal-less. Another type which is seal-less is the Peristaltic which uses a rotating roller assembly to compress a hose over a given arc length. These pumps are very reliable in pumping medium to thick liquids which typically are not handled by Centrifugal pumps and in applications where medium to high discharge pressures are needed at low flow rates. Varying the motor speed easily controls their output. Most units include some sort of built in relief valve, but those that do not must have one installed into the piping to prevent a dangerous over pressure condition. Not recommended for liquids with fine abrasives or thin non-lubricating liquids like water that will accelerate pump wear.Typical Positive Displacement Rotary pumps include helical gear, spur gear, lobe, progressive cavity, peristaltic, flexible impeller and sliding vane to name a few.
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  1. 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
  2. Oberdorfer Pumps

    Bronze Pedestal Gear Pump

    N9000E

    $629.00
    Bronze Pedestal Gear pump. Often used as a oil pump on large ships to pre-lube the bearings.
    • Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffected by the backpressure in the...
  3. Oberdorfer Pumps

    Bronze Pedestal Gear Pump

    N9000L

    $629.00
    Bronze Pedestal Gear pump. Often used as a oil pump on large ships to pre-lube the bearings.
    • Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffected by the backpressure in the...
  4. Oberdorfer Pumps

    Bronze Pedestal Gear Pump

    N9000LS3

    $608.00
    Bronze Pedestal Gear pump with relief valve. Often used as a oil pump on large ships to pre-lube the bearings.
    • Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffected by the b...
  5. Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N9000LR

    $688.00
    Bronze Pedestal Gear pump with relief valve. Often used as a oil pump on large ships to pre-lube the bearings.
    • Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffected by t...
  6. Hypro Pumps

    Bronze Gear Pump W/Relief

    BBV1

    $699.00

    Bronze Pedestal Gear Pump, light duty with relief valve.

    Also see N2000 or N3000

    Self-priming, positive displacement, external rotary gear pumps are ideal for a wide range of light-duty industrial, marine, agricultural, and commercial applicatio...

    Bronze 1/4" Learn More
  7. Graco Pumps

    115v Electric APEX Oil Transfer pump

    260109 (TP32-15)

    $620.00

    The PBL oil transfer pumps are designed specifically to transfer bulk oils and hydraulic fluids, motor oil, antifreeze. Larger horsepower electric motors with a smaller displacement gear pump assure adequate power to pump viscous fluids at low ...

    115V- 7.9gpm Learn More
  8. Oberdorfer Pumps

    Bronze Gear pump For Hydraulic Motor

    N993S5

    $612.00
    Pump end only, no motor. Pump housings and gears are made of top quality bronze; shafts are from stainless steel 303. Bearings are designed of high performance carbon-graphite material selected for wear resistance and long service life.

    Gear pump...

  9. Oberdorfer Pumps

    N994 Gear Pump Only

    N994R-S15

    $699.00
    Gear Pump Only. No motor. Pump housings and gears are made of top quality bronze; shafts are from stainless steel 303. Gear Pump KIT. Bearings are designed of high performance carbon-graphite material selected for wear resistance and long servi...
  10. Hypro Pumps

    Bronze Pedestal Gear Pump

    BB1

    $650.35

    Bronze Pedestal Gear Pump, light duty. Self-priming, positive displacement, external rotary gear pumps are ideal for a wide range of light-duty industrial, marine, agricultural, and commercial applications, providing a nearly pulseless flow and ar...

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