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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 405m rubber impeller pump

    Oberdorfer Pumps

    Rubber Impeller Bronze Pump

    405M-04N26
    $1,203.00

    Oberdorfer rubber (flex) impeller pump with solid cast bronze housing. Close coupled Rubber Impeller Pumps are made of high quality bronze for maximum corrosion resistance. The rubber impeller is mounted on a separate stainless steel shaft which i...

    115v 1HP 1" ODP Learn More
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  2. Oberdorfer N993 Pump motor

    Oberdorfer Pumps

    N993 Pump & motor 12VDC

    N993-C81
    $1,395.00

    12VDC gear 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.

    12 volt Gear pumps ar...

    12VDC Learn More
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  3. Oberdorfer N993RM-J07 N993 Pump motor

    Oberdorfer Pumps

    N993 Pump & motor

    N993RM-J07
    $1,238.00
    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 displac...

    1/2HP 115/230v Relief Vavle Learn More
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  4. 406M oberdorfer pump

    Oberdorfer Pumps

    406M Macerator Pump

    406M-04N26
    $1,397.00
    Sewage transfer macerator chopper pump with rubber impeller. Portable all bronze construction. Commercial heavy duty waste pump for pumping out RV, Boat sewage holding tanks. This model does NOT have the optional vacuum switch.
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  5. DC Bronze Rotary Gear Pump w/ relief valve

    Oberdorfer Pumps

    DC Bronze Rotary Gear Pump w/ relief valve

    N991R-32C81
    $1,427.00
    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 life. Gear pumps are positive displacement pum...
    12VDC 1/4 Learn More
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  6. Oberdorfer N9000RES18 Bronze Pedestal Gear Pump w/ relief valve

    Oberdorfer Pumps

    Bronze Pedestal Gear Pump w/ relief valve

    N9000RES18
    $1,245.00
    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. Oberdorfer N990-37R Bronze Rotary Gear Pump PEO w/ brkt relief valve

    Oberdorfer Pumps

    Bronze Rotary Gear Pump PEO w/ brkt & relief valve

    N990-37R
    $1,200.00
    Oberdorfer Close coupled bronze rotary gear pump end only w/ brkt & relief valve.
    • Bronze Construction with SS shaft
    • Helical gears for quiet operation
    • Self-lubricating carbon bearings
    • O-ring seal for max. leak protection
    • Pump End Only (Motor Not ...
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  8. Oberdorfer N990R-38 Bronze Rotary Gear Pump PEO w/ brkt, clutch, relief valve

    Oberdorfer Pumps

    Bronze Rotary Gear Pump PEO w/ brkt, clutch, & relief valve

    N990R-38
    $1,267.00
    Oberdorfer Close coupled bronze rotary gear pump end only. includes 12V clutch, brkt, and relief valve..
    • Bronze Construction with SS shaft
    • Helical gears for quiet operation
    • Self-lubricating carbon bearings
    • O-ring seal for max. leak protection
    • Pu...
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  9. Portable Toilet Service Sytem

    Pumptec

    Portable Toilet Service Sytem

    80729
    $1,335.00

    Series 356U - M60 Pump 12 Volt 0-700 PSI. Waterhorse 80729 PWK-713-12V.

    Includes unloader, gun, and inlet filter. Does NOT include hose. This electric pressure washer cleaner is one work horse in the pressure washing business and in power washing...

    12VDC pressure pump Learn More
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  10. Oberdorfer N1100 1.25 Bronze gear pump PEO

    Oberdorfer Pumps

    1.25" Bronze gear pump PEO

    N1100
    $1,410.00
    1 1/4" Bronze rotary gear pump with relief valve and to be close coupled to a 1 HP 56C to 3HP 182TC motors of electric or hydraulic type.

    Use to pump oil and other viscous thick liquids as well as diesel and all the de-icing fluids. Uses such as ...

    NO motor Learn More
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