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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. PBL_Oil.jpg

    Graco Pumps

    230v Electric APEX Oil Transfer pump

    260104
    $800.00

    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 ...

    230V - 4.25gpm Learn More
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  2. Graco 260109 (TP32-15) 115v Electric APEX Oil Transfer pump

    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
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  3. Graymills SG1B 1/25 Vertical CI Centrifugal Pump Mtr

    Graymills Pumps

    Vertical CI Centrifugal Pump & Mtr

    SG1B 1/25
    $750.21
    The SG series are gear pumps specially designed for high pressure applications. These pumps are recommended for use with liquids that have some lubricating qualities and are relatively free of abrasives and scale. These pumps mount vertically and...
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  4. Graymills SG2B 1/8 Vertical CI Centrifugal Pump Mtr

    Graymills Pumps

    Vertical CI Centrifugal Pump & Mtr

    SG2B 1/8
    $886.03
    The SG series are gear pumps specially designed for high pressure applications. These pumps are recommended for use with liquids that have some lubricating qualities and are relatively free of abrasives and scale. These pumps mount vertically and...
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  5. Oberdorfer N999RM-F07 Close Coupled Bronze Rotary Gear Pump

    Oberdorfer Pumps

    Close Coupled Bronze Rotary Gear Pump

    N999RM-F07
    $955.00
    Bronze gear pump mounted to a 1725rpm 1/3 HP motor. Pump has relief valve.

    Features N999 Series:

    • Compact design eases installation and use in limited space areas.
    • Construction is bronze and stainless steel wetted components.
    • Close toleran...
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  6. Hypro GMCV6VC7 Cast Iron Gear pump

    Hypro Pumps

    Cast Iron Gear pump

    GMCV6VC7
    $2,587.51
    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
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  7. Aquatec 5513-1E12-B706 5 chamber diaphragm pump 230

    Aquatec Pumps

    5 chamber diaphragm pump 230V

    5513-1E12-B706
    $199.00
    550 Series Super Flow Pump: 230V 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 desig...

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  8. Aquatec 5503-1FE1-B706 5 chamber diaphragm pump 230

    Aquatec Pumps

    5 chamber diaphragm pump 230

    5503-1FE1-B706
    $198.00
    550 Series Super Flow Pump: Reverse Osmosis System Pump, High Powered RO / DI Reverse Osmosis Pump. Quad QD ports. Order fittings seperately.

    OPERATION: The 550 pumps can draw water from a holding tank and pressurizeit, or boost the pressure from...

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