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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. Aquatec 5511-1E12-V726 5 chamber diaphragm pump

    Aquatec Pumps

    5 chamber diaphragm pump

    5511-1E12-V726
    $705.18
    550 Series Super Flow Pump: Reverse Osmosis System Pump, High Powered RO / DI Reverse Osmosis Pump

    OPERATION: The 550 pumps can draw water from a holding tank and pressurizeit, or boost the pressure from a low pressure source. It is designed t...

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  2. Aquatec 5513-1C01-J586 5 chamber diaphragm pump

    Aquatec Pumps

    5 chamber diaphragm pump

    5513-1C01-J586
    $290.54
    550 Series Super Flow Pump: Reverse Osmosis System Pump, High Powered RO/DI Reverse Osmosis Pump

    OPERATION: The 550 pumps can draw water from a holding tank and pressurize it, or boost the pressure from a low pressure source. It is designed to op...

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  3. Oberdorfer N994J-T45 N994 Gear Pump & Mtr.

    Oberdorfer Pumps

    N994 Gear Pump & Mtr.

    N994J-T45
    $2,350.40
    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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  4. Oberdorfer 10GB1111S 10 GPM CI GEAR PUMP PED

    Oberdorfer Pumps

    10 GPM CI GEAR PUMP & PED

    10GB1111S
    $1,316.90
    Medium duty CI gear pump with relief valve and pedistal for long coupling. Mechanical sealed, bronze bearings. CW rotation.

    b>Features:

    1. Shafts: Ground and polished steel.
    2. Helical Gears: For quiet running.
    3. Housing: Of close grain cast iron. Three...
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  5. oberdorfer gear pump bronze

    Oberdorfer Pumps

    N994 Gear Pump & Motor

    N994H-J46
    $2,652.00

    Gear Pump, Oberdorfer.

    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...

    1/2HP 115/230v 1/2" Learn More
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  6. Aquatec 5510-1D01-B636 5 chamber diaphragm pump 12v

    Aquatec Pumps

    5 chamber diaphragm pump 12v

    5510-1D01-B636
    $290.54
    OPERATION: The 550 pumps can draw water from a holding tank and pressurizeit, or boost the pressure from a low pressure source. It is designed to operate intermittently, but most versions can run continuously for several hour intervals.It can be ...
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  7. oberdorfer gear pump bronze N994RH-N26

    Oberdorfer Pumps

    N994 Gear Pump & Motor w/Relief Valve

    N994RH-N26
    $3,432.00

    Gear Pump, Oberdorfer.

    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...

    1HP 115/230v 1/2" Learn More
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  8. ober_n994mtr.jpg

    Oberdorfer Pumps

    N994 Gear Pump & Mtr.

    N994R-N75
    $1,848.60
    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...

    12VDC Learn More
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  9. Oberdorfer N994-37 N994 Gear Pump w/brkt

    Oberdorfer Pumps

    N994 Gear Pump w/brkt

    N994-37
    $1,717.30
    Gear Pump. 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 service life.

    Gea...

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  10. Oberdorfer 18GB1111S 18 GPM CI GEAR PUMP PED

    Oberdorfer Pumps

    18 GPM CI GEAR PUMP & PED

    18GB1111S
    $1,593.80
    Medium duty CI gear pump with relief valve and pedistal for long coupling. Mechanical sealed, bronze bearings. CW rotation.

    b>Features:

    1. Shafts: Ground and polished steel.
    2. Helical Gears: For quiet running.
    3. Housing: Of close grain cast iron. Three...
    Learn More
    Add to Wish List Add to Compare
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