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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 406MK-04N26 406M Macerator Pump

    Oberdorfer Pumps

    406M Macerator Pump

    406MK-04N26
    $2,207.00
    Sewage transfer macerator chopper pump w/rubber impeller. Portable all bronze construction. Includes vacuum switch to help prevent dry running.
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  2. Hypro GMSV6C7T 316 Stainless Steel Gear pump

    Hypro Pumps

    316 Stainless Steel Gear pump

    GMSV6C7T
    $4,300.18

    Rotary Gear pump with motor. 316 Stainless construction, Ryton gears. 

    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...

    3HP 230V TEFC Learn More
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  3. Oberdorfer N991M-J07 N991 Gear PUMP motor

    Oberdorfer Pumps

    N991 Gear PUMP & motor

    N991M-J07
    $1,302.00
    Gear PUMP & 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 pumps a...

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  4. Oberdorfer N994J-W45 N994 Gear Pump Mtr.

    Oberdorfer Pumps

    N994 Gear Pump & Mtr.

    N994J-W45
    $1,995.00
    Gear Pump. 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 pumps are positive...

    2HP 115/230 Learn More
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  5. Oberdorfer N994J-T45 N994 Gear Pump & Mtr.

    Oberdorfer Pumps

    N994 Gear Pump & Mtr.

    N994J-T45
    $1,808.00
    Gear Pump. 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 pumps are posit...

    1-1/2Hp 115/230v Learn More
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  6. oberdorfer gear pump bronze

    Oberdorfer Pumps

    N994 Gear Pump & Motor

    N994H-J46
    $2,040.00
    Gear Pump. 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 pumps are posit...

    1/2HP 115/230v 1/2" Learn More
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  7. Hot Oil Gear Pump

    Hypro Pumps

    Hot Oil Gear Pump

    NG7V
    $2,168.60

    NG NSF Listed Industrial Gear Pumps. OBSOLET

    Gear pumps are recommended for non-abrasive, non-flammable liquids compatible with pump component materials. They can be used for liquid circulation, lubrication, pressure boosting, filtering, medium p...

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  8. AMT electric diaphragm mud pump 3" ipt

    AMT Pumps

    3" Electric Diaphragm Pump

    337E-96
    20% Off Special Price $2,702.40 Regular Price $3,378.00

    Electric Diaphragm water pumps features 2-stage, 44 to 1 gear reduction with a large diameter output gear and heavy duty ball bearing construction. Often referred to as Mud pumps or Sludge pumps, diaphragm trash pumps are designed to pump mud, slu...

    1.5HP 115/230v Learn More
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  9. Close Coupled Bronze Rotary Gear Pump w/ relief valve

    Oberdorfer Pumps

    Close Coupled Bronze Rotary Gear Pump w/ relief valve

    N991RN32-F08
    $881.00
    Bronze Rotary Gear Pump with electric motor. 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...
    Pump & 1/3HP Motor 115v 1/4" Learn More
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  10. Oberdorfer N999-spec Bronze Rotary Gear Pump EXP

    Oberdorfer Pumps

    Bronze Rotary Gear Pump EXP

    N999-spec
    $1,200.00
    1/2 gpm diesel oil pump with EXP motor.

    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 perf...
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