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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 - N4000LR

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump W Relief Valve

    N4000LRS3
    $911.30

    Bronze Pedestal Gear Pump With Relief Valve. Bronze Pedestal Gear pump. Often used as a oil pump on large ships to pre-lube the bearings, Chillers (Dynaflux) often used with welders. See performance chart for motor speed VS HP VS performance.

    • G...
    1/2" w/ relief valve Learn More
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  2. Hypro GMCV5VA6 Cast Iron Gear pump

    Hypro Pumps

    Cast Iron Gear pump

    GMCV5VA6
    $1,244.00
    Rotary Cast Iron Gear pump 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 than...

    2HP 115/230v ODP 3/4" Learn More
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  3. Dual Head Adjustable mechanical feed rate 120GPD

    Stenner

    Dual Head Adjustable mechanical feed rate 170GPD

    170DM5
    $699.00
    G.H. Stenner & Company offers a complete line of highly reliable peristalic chemical feeders. Use for grease trap enzymes, algaecide, biocide, biocidal, antimicrobial, chlorination - chlorine sanitizers and disinfectants injection, cooling towe...
    8.5-170.GPD Learn More
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  4. Oberdorfer N4000L Bronze Pedestal Gear Pump

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump

    N4000RS3
    $1,357.20
    Bronze Pedestal Gear pump. Often used as a oil pump on large ships to pre-lube the bearings. See performance chart for motor speed VS HP VS performance.
    • Gear pumps are positive displacement pumps. Each shaft revolution displaces a definite a...
    1/2" Learn More
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  5. Hypro GMCV2VA3 Cast Iron Gear pump 1/4

    Hypro Pumps

    Cast Iron Gear pump 1/4"

    GMCV2VA33T
    $1,123.00

    Rotary Cast Iron Gear pump 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 than o...

    3/4HP 230/460v TEFC 1/4" Learn More
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  6. Oberdorfer N993R N993 bronze Gear pump

    Oberdorfer Pumps

    3/8 bronze Gear pump

    N993R-03
    $1,259.70
    Pump Only PEO, 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 pu...

    Pump Only PEO, Relief 3/8" ports Learn More
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  7. 316SS Gear pump

    Hypro Pumps

    316SS Gear pump

    GMSV4A4
    $1,735.68

    316SS Rotary Gear pump with 1HP motor. 303 SS fasteners, Ryton gears. Stainless steel gear pump for aggressive chemicals.

    Use for pressure spraying, circulation of lubricants, tank / drum filling. Will handle water like liquids to very thick. B...

    1/2" 1HP 115/230v Learn More
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  8. Hypro GMSV4A 316SS Gear pump

    Hypro Pumps

    316SS Gear pump

    GMSV4A23
    $1,735.68

    316SS Rotary Gear pump with 1HP motor. 303 SS fasteners, Ryton gears. Stainless steel gear pump for aggressive chemicals.

    Use for pressure spraying, circulation of lubricants, tank / drum filling. Will handle water like liquids to very thick. B...

    1/2HP, 3phase Learn More
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  9. 316SS Gear pump

    Hypro Pumps

    316SS Gear pump

    GMSV2A
    $1,382.98

    316SS Rotary Gear pump end PEO*. 303 SS fasteners, Ryton gears. Stainless steel gear pump for aggressive chemicals.

    Use for pressure spraying, circulation of lubricants, tank / drum filling. Will handle water like liquids to very thick. Bi-rota...

    No motor, 3/8" Learn More
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  10. Oberdorfer N991M-f07 N991 Gear PUMP motor

    Oberdorfer Pumps

    N991 Gear PUMP & motor reversible

    N991M-F07
    $1,285.70

    Reversible 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. Pump ...

    115v/230v Reversible 1/4" Learn More
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