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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 N9000LRS15 Bronze Pedestal Gear Pump w/ relief valve

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N9000LRS15
    $1,393.47
    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...
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  2. Hypro GMBN Bronze Gear pump only peo

    Hypro Pumps

    Bronze Gear pump only

    GMBN3VA
    $1,295.88
    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...

    3/8" motor mount kit Learn More
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  3. Oberdorfer N9000RE Bronze Pedestal Gear Pump w/ relief valve

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N9000RE
    $1,357.20
    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...
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  4. Oberdorfer N9000RES17 Bronze Pedestal Gear Pump w/ relief valve

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N9000RES17
    $1,388.40
    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...
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  5. Hypro MCN6VB Rotary Gear pump only

    Hypro Pumps

    Rotary Gear pump only

    MCN6VB
    $5,266.34
    Rotary Gear pump end. Cast Iron with 303 SS fastners, CI 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.

    U...

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  6. Oberdorfer N9000RS18 Bronze Pedestal Gear Pump w/ relief valve

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N9000RS18
    $1,708.20
    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...
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  7. Hypro MBN3VA Bronze Gear pump only

    Hypro Pumps

    Bronze Gear pump only

    MBN3VA
    $5,401.27
    Rotary Gear pump end. 303 SS fastners, 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 pressure...

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  8. Oberdorfer N9000RS3 Bronze Pedestal Gear Pump w/ relief valve

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N9000RS3
    $1,357.20
    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...
    Learn More
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  9. Bronze Gear pump

    Hypro Pumps

    Bronze Gear pump

    GMBN4VA5
    $1,615.42

    Rotary Gear pump 3/8". 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 press...

    3/4" 1.5HP 115/230V ODP Learn More
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  10. Ober_N9000R.gif

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N1000R
    $401.70
    Bronze Pedestal Gear pump with relief valve. Often used as a coolant pump on welding torch. Pump flow is reversible.
    • Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite amount of liquid relatively unaffecte...
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