Oberdorfer 172B-08A82 — Compact 24V DC Bronze Centrifugal Pump and Motor Unit
The Oberdorfer 172B-08A82 is a close-coupled bronze centrifugal pump and motor assembly built for demanding low-pressure circulation and liquid transfer applications. Running on 24 volts DC, it is well suited for use in environments where standard AC power is unavailable or impractical, including diesel-powered equipment, mobile industrial systems, engine cooling circuits, and off-grid installations. The pump body, impeller, and housing are all constructed from heavy-duty corrosion-resistant bronze, while the shaft is made from 316 passivated stainless steel — a combination that holds up reliably against both fresh water and a broad range of compatible commercial liquids. A carbon and ceramic mechanical rotary face seal with a Buna (NBR) rubber element provides positive, leak-resistant sealing throughout the operating range.
What sets this unit apart is its quiet, efficient single open-vane impeller design. Liquid enters at the center of the impeller and is accelerated outward by centrifugal force, producing a smooth, non-pulsating flow without the impeller making contact with other pump components. This means quieter operation, lower wear over time, and no need for a pressure relief valve since the discharge can be fully throttled without risk of overloading the motor or bursting the line. The 24V TEFC (Totally Enclosed Fan Cooled) DC motor is compact yet capable, making the 172B-08A82 a practical choice wherever space is at a premium and reliable, self-contained pumping is required.
Key Features
- Heavy-duty corrosion-resistant bronze pump body and impeller
- 316 passivated stainless steel shaft for long service life
- Single open-vane rotating impeller — quiet, efficient, anti-clogging design
- Carbon and ceramic mechanical rotary face seal with Buna (NBR) rubber element
- No pressure relief valve required — discharge can be fully shut off without motor overload
- Flow easily controlled by a throttling valve on the discharge line
- Compact, close-coupled design — pump end and motor in one unit
- 24V DC TEFC (Totally Enclosed Fan Cooled) motor for use in non-AC environments
- Compatible with water, water solutions, oils, and a wide range of commercial chemicals
- Suitable for viscous liquids up to 2,000 Saybolt Seconds Universal (SSU)
Applications
- Engine block temperature control and engine cooling circulation
- Radiator and heat exchanger circulation in industrial and mobile equipment
- Coolant circulation in diesel-powered systems and generators
- Windscreen washing systems
- Hot and cold water system circulation
- Low-pressure liquid transfer in off-grid and mobile installations
- Chemical circulation (verify fluid compatibility with manufacturer)
- Bait tank and livewell circulation
- HVAC and cooling loop circulation in 24V DC systems
- General industrial circulation where AC power is unavailable
Specifications
- Part Number: 172B-08A82
- Voltage: 24V DC
- Motor Power: 1/10 HP (0.10 HP)
- Motor Type: TEFC (Totally Enclosed Fan Cooled), Single Phase DC
- Motor Speed: 3,480 – 3,700 RPM
- Max Flow Rate: 18 – 20 GPM
- Max Pressure: 7 PSI
- Max Temperature: 212°F (100°C)
- Pump Construction: Bronze body and impeller
- Shaft Material: 316 Passivated Stainless Steel
- Seal Type: Mechanical — Carbon/Ceramic rotary face with Buna (NBR) element
- Inlet Port Size: 3/4 Inch NPT
- Outlet/Discharge Port Size: 3/4 Inch NPT
- Impeller Type: Single open-vane rotating
Frequently Asked Questions
Q: Can the Oberdorfer 172B-08A82 run dry without damage?
Like most centrifugal pumps with mechanical shaft seals, this unit is not designed for continuous dry running. The mechanical seal depends on liquid to provide lubrication and cooling. Even brief dry-run periods can cause premature seal wear or failure. Always ensure the pump is primed before operation.
Q: Is this pump self-priming?
No. The 172B-08A82 is a standard centrifugal pump and is not self-priming. It must be installed below the fluid source or otherwise primed before use. For applications where self-priming capability is required, Oberdorfer offers separate self-priming centrifugal models.
Q: What fluids is the 172B-08A82 compatible with?
The bronze construction, stainless steel shaft, and Buna (NBR) mechanical seal make this pump compatible with water, water solutions, oils, and many commercial chemicals. For aggressive or specialty chemicals, compatibility should be verified with Oberdorfer directly, as fluid chemistry affects all wetted materials including the seal elastomer.
Q: Does this pump require a pressure relief valve?
No. Because centrifugal pumps produce non-positive displacement flow, the discharge line can be completely shut off without danger of overloading the motor or rupturing the line. Horsepower demand actually decreases as back-pressure increases, so no relief valve is needed.
Q: Can flow rate be adjusted on this pump?
Yes. Flow can be conveniently regulated using a throttling valve installed on the discharge side of the pump. This is the preferred method of flow control for centrifugal pump units like the 172B-08A82.
Q: What is the maximum viscosity fluid this pump can handle?
The 172B-08A82 is rated for liquids up to 2,000 Saybolt Seconds Universal (SSU) viscosity. Fluids above this rating may not be moved efficiently by the centrifugal impeller design.
Q: Is a repair kit available for this pump?
Yes. Oberdorfer offers a repair kit (part number 11071) compatible with the 172B series pump end, covering replacement seal components and wear parts for the pump end assembly.
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