Flexible Impeller Pumps | Durable, Efficient, Marine & Industrial Use

Trust Over 100 Years of Pump Technology Expertise

Discover Our Impeller Pump, Reliable For Tough Condition

Welcome to the world of innovative flexible pumps, setting new standards in the industrial, marine, and environmental sectors. Our Flexible Rubber Pumps are characterized by excellent performance, reliability, and exceptional corrosion resistance, thanks to the use of top-quality materials like bronze and 303 stainless steel.

Our pumps are known for their great performance and reliability. They also resist corrosion thanks to the use of high-quality materials like bronze and 303 stainless steel. Oberdorfer offers durable flexible impeller and centrifugal pumps for demanding applications.

Why Choose Oberdorfer?

Oberdorfer pumps efficiently deliver performance. They can achieve flow rates of 58 GPM (220 lpm). Their pressure can reach up to 42 PSIG (2.9 bar).This ensures effective operation for many different applications.

We manufacture our pumps using bronze and high-chrome stainless steel shafts. This gives them great resistance to corrosion. You can choose between pedestal-style or flange-mounted designs to fit your needs.

Our impellers can handle many types of liquids, from raw water to industrial fluids.

Operating Principle

Flexible Rubber Pumps operate as positive-displacement pumps, where the rotor with flexible vanes effectively draws and transports the liquid within the pump chamber. Due to the ability of the vanes to compress and rebound, our pumps are ideal for applications requiring consistent flow and high pressure resilience.

Typical Applications

Our pumps are used in many industries. In the marine, they help cool engines and remove water. In the process, they transfer slurry. In aviation, they inflate tires. In environmental protection, they transfer contaminated water and sample groundwater.

Flexible Impeller Pumps – Performance at a Glance

Check out our selection chart for Oberdorfer flexible rubber impeller pumps. Compare models by port size, capacity, and more to find the ideal pump for your industrial or marine needs.

Download

See Our Range of Flexible Impeller Pumps

Low Flow 6.5 GPM - 11.3 GPM

N211D | Bronze Flexible Impeller Pump

Flow: 6.5 GPM / 24.61 LPM
Pressure: 26 PSI / 1.794 bar

N211M | Bronze Flexible Impeller Pump

Flow: 12 GPM / 45.4 LPM
Pressure: 26 PSI / 1.8 bar

201M Flexible impeller pump | Oberdorfer

Max Flow
11.3 GPM - 42.78 LPM
Max Pressure
26 PSI - 1.794 bar

209M | Bronze Close Coupled Flexible Impeller Pump

Flow: 9 GPM - 34.07 LPM
Pressure: 12 PSI - 0.828 bar

N200M | Bronze Pedestal Flexible Impeller Pump

Flow: 5.0 GPM / 18.9 LPM
Pressure: 24 PSI - 1.656 bar

N201D | Bronze Close Coupled Flexible Impeller Pump

Flow: 7.9 GPM - 29.9 LPM
Pressure: 13.0 PSI - 0.9 bar

Medium Flow 12.5 GPM - 25 GPM

405M | Bronze Close Coupled Flexible Impeller Pump

Flow: 25 GPM / 94.64 LPM
Pressure: 42.8 PSI / 2.9532 bar

N202M | Bronze Flexible Impeller Pump

Flow: 12.5 GPM - 47.32 LPM
Pressure: 26 PSI - 1.794 bar

301M | Bronze Pedestal Flexible Impeller Pump

Flow: 20.5 GPM - 77.6 LPM
Pressure: 34.6 PSI - 2.3874 bar

N305M | Bronze Close Coupled Flexible Impeller Pump

Flow: 15.3 GPM / 57.92 LPM
Pressure: 34.6 PSI / 2.3874 bar

406M | Bronze Close Coupled Flexible Impeller Pump

Flow: 25 GPM / 94.64 LPM
Pressure: 42.8 PSI / 2.9532 bar

Max Flow 36 GPM - 70 GPM

501 | Bronze Pedestal Flexible Impeller Pump

Flow: 59 GPM / 223.34 LPM
Pressure: 56 PSI / 3.864 bar

214M | Bronze Close Coupled Flexible Impeller Pump

Flow: 12.5 GPM / 47.3 LPM
Pressure: 30.0 PSI / 2.06 bar

401M | Bronze Pedestal Flexible Impeller Pump

Flow: 36 GPM - 136.27 LPM
Pressure: 34.6 PSI - 2.3874 bar

402M | Bronze Flexible Impeller Pump

Flow: 36 GPM - 136.27 LPM
Pressure: 34.6 PSI - 2.3874 bar

How Does an Impeller Pump Work?

Impeller pumps are positive-displacement pumps. The rotor with flexible vanes is mounted centered in a circular housing which has a compressed area at one side. Flexible blades on the periphery of the impeller provide pumping action.

As the impeller spins, the liquid between the blades is pushed out into the discharge port. This happens because of a cam inside the pumping chamber. The flow may be throttled or shut off for a short period on the discharge side without the need for a relief valve.

Discharge, Flow, and Suction

The vanes on the impeller are compressed within the chamber allowing constant discharge through the outlet port of the pump. As the impeller spins, it moves the liquid from the pump's suction side to the discharge side. The impeller keeps spinning while it leaves the cam.This creates a vacuum that pulls the fluid into the pump’s chamber. This fundamental principle applies to both flexible impeller pumps and centrifugal pumps, even though the mechanics differ slightly.

Types of Pump Impeller

Different impeller designs are suited for different needs.

An open impeller has a simple design. It works well with liquids that have solids. This makes it great for wastewater or slurry transfer.

Closed impellers are different. They are more efficient with clean liquids. You often find them in centrifugal pumps. These pumps focus on performance and efficiency.

Oberdorfer engineers choose the right impeller type. They consider if the pump is for marine cooling, chemical transfer, or industrial processing.

Oberdorfer Flexible Impeller Pumps