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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 N990J-T47 Bronze Rotary Gear Pump w/ motor

    Oberdorfer Pumps

    Bronze Rotary Gear Pump 1"

    N990H-T47
    $2,068.00

    1" Close coupled bronze rotary gear pump with motor. 1.5HP

    • Bronze Construction with SS shaft
    • Helical gears for quiet operation
    • Self-lubricating carbon bearings
    • O-ring seal for max. leak protection
    • The pump drive shaft is connected to the mo...
    1-1/2HP 115/230v 1" Learn More
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  2. Oberdorfer - N970R-39: 3/4" Bronze gear pump

    Oberdorfer Pumps

    3/4" Bronze gear pump

    N970R-39
    $1,172.00

    3/4" Bronze rotary gear pump with relief valve, close couples to a 1725 RPM motor. PUMP ONLY, Gear Pump End Only (no motor - for Clutch Mounted assembly). Often used to pump Diesel fuel. Pump housings and gears are made of top quality bronze, shaf...

    PEO Relief Valve Learn More
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  3. 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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  4. Oberdorfer N993 Pump motor

    Oberdorfer Pumps

    N993 Pump & motor 12VDC

    N993Q-J75
    $1,776.00

    12VDC gear Pump 1/2HP.

    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 pu...

    12VDC Learn More
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  5. Oberdorfer - N992R-01C81: Gear Pump

    Oberdorfer Pumps

    Gear Pump & 1/4HP Motor

    N992R-01C81
    $1,630.20

    Bronze Gear Pump with housings and gears are made of top quality bronze; shafts are from stainless steel 303. Continuous Duty gear pump fitted with 115/230v 1/4hp motor. Bearings are designed of high performance carbon-graphite material selected f...

    1/4HP 115/230V ODP Learn More
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  6. Oberdorfer N992r-c81 Gear Pump & 12VDC Motor

    Oberdorfer Pumps

    Gear Pump & 12VDC Motor

    N992R-C81
    $1,618.10
    12V DC Gear Pump with relief valve. Housings and gears are made of top quality bronze; shafts are from stainless steel 303. Continuous Duty gear pump fitted with 12V DC motor. Bearings are designed of high performance carbon-graphite material s...
    1/3HP 12V DC Relief valve Learn More
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  7. oberdorfer gear pump bronze 1/2

    Oberdorfer Pumps

    N994 12v DC Gear Pump

    N994H-H75
    $1,729.00
    12v DC 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.

    12 volt Gear ...

    1HP 12VDDC Learn More
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  8. bronze gear pump with motor n992

    Oberdorfer Pumps

    N992 Pump & Mtr.

    N992-F41
    $1,118.00
    Bronze 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. Motor may not ...
    1/3HP 115v Learn More
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  9. Oberdorfer N993M-J07 N993 Bronze Pump Motor

    Oberdorfer Pumps

    N993 Bronze Pump & Motor

    N993M-J07
    $1,146.00
    Bronze 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 ar...

    1/2 HP 115v Learn More
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  10. 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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