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.

Oberdorfer Pumps

Rubber Impeller Bronze Pump

405M-04M35

$1,616.00

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 3/4HP 1" TEFC Learn More

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Oberdorfer Pumps

Bronze Rotary Gear Pump w/ motor & relief valve

N990RH-M46

$2,114.00
Oberdorfer Close coupled bronze rotary gear pumps.
- 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 motor shaf...
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Hypro Pumps

Cast Iron Gear pump 1/4"

GMCV2VA33T

$2,131.57

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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Hypro Pumps

Hot Oil Gear Pump

NG7V

$2,168.60

NG NSF Listed Industrial Gear Pumps. OBSOLET

Gear pumps are recommended for non-abrasive, non-flammable liquids compatible with pump component materials. They can be used for liquid circulation, lubrication, pressure boosting, filtering, medium p...

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Hypro Pumps

Cast Iron Gear pump 1/4"

GMCV2VA3

$1,530.98

Rotary Cast Iron Gear pump end. 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 one minute.

Hypr...

3/4HP 115/230v ODP 1/4" Learn More

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