Oberdorfer 700C Bronze Centrifugal Pump End – 3.75" Impeller, High-Flow Liquid Transfer Up to 85 GPM
The Oberdorfer 700C is a pump end only — no motor included — built from solid bronze and engineered for reliable, continuous-duty liquid transfer across a wide variety of industrial, commercial, and utility applications. With a 3.75-inch bronze impeller, a 416 stainless steel shaft, and a Buna mechanical seal, this pump is built to last in demanding environments while remaining compatible with water, light oils, and a broad range of mild solvents and commercial chemicals. It mounts directly to a standard NEMA 56J flange jet pump motor with a weld-on base and threaded shaft end — making it a practical and cost-efficient replacement or upgrade pump end for existing motor installations.
Capable of delivering flows up to 85 GPM at a maximum pressure of 22 PSI, the 700C operates at 3450 RPM and pairs with a 3/4 HP motor, which is not included with this listing. The pump is designed for flooded suction operation, meaning the pump must be installed below the liquid level. With the use of a foot valve and manual priming, suction lift of up to 15 feet is achievable. Its open vane impeller design keeps the impeller free of contact with other pump parts, resulting in smooth, quiet operation and no need for a pressure relief valve on the discharge side. Temperature handling tops out at 212°F, and optional fluoroelastomer or PTFE seals are available for more aggressive chemical applications or elevated temperature service.
Key Features
- Pump end only — no motor included; pairs with NEMA 56J flange jet pump motor
- 3.75-inch open vane bronze impeller for efficient, quiet fluid transfer
- 416 stainless steel shaft for corrosion resistance and long-term durability
- Buna (Nitrile) carbon/ceramic mechanical shaft seal — standard configuration
- Optional fluoroelastomer (S10) or PTFE (S11) seals available for aggressive media
- No relief valve required — discharge line can be fully throttled safely
- Compatible with viscous liquids up to 2,000 Saybolt Seconds Universal (SSU)
- Single rotating impeller design handles small liquid impurities without damage
Applications
- General liquid transfer and low-pressure circulation
- Boiler feed and condensate return systems
- Cooling towers and HVAC water circulation
- Irrigation and agricultural spraying systems
- Fountains and water feature recirculation
- Jockey pump service and pressure booster systems
- Chemical processing with compatible materials
- Filtration systems and industrial utility service
Specifications
- Part Number: 700C
- Construction: Bronze
- Impeller: 3.75-inch bronze, open vane
- Shaft Material: 416 stainless steel
- Shaft Seal: Buna (Nitrile) mechanical — carbon/ceramic, standard
- Inlet Port: 1-1/4 inch NPT
- Outlet Port: 1 inch NPT
- Maximum Flow: 85 GPM
- Maximum Pressure: 22 PSI
- Maximum Temperature: 212°F
- Required Motor Speed: 3450 RPM
- Required Motor HP: 3/4 HP
- Motor Mount: NEMA 56J flange, weld-on base, threaded shaft
- Motor Rotation: Counter-clockwise (viewed from inlet end)
- Maximum Suction Lift (with foot valve and priming): 15 feet
- Maximum Viscosity: 2,000 SSU
- Motor: Not included
Frequently Asked Questions
Q: Does the Oberdorfer 700C come with a motor?
No. The 700C is sold as a pump end only. It is designed to mount to a separately sourced NEMA 56J flange jet pump motor rated at 3/4 HP and 3450 RPM. The motor must have a weld-on base and a threaded shaft end to accept the impeller.
Q: Can this pump self-prime, or does it require flooded suction?
The 700C is not a self-priming pump in standard configuration. It requires flooded suction — meaning it must be installed below the liquid level. However, if a foot valve is installed at the start of the suction line and all air is manually bled from the pump, it can lift liquid from up to 15 feet below the pump.
Q: What types of liquids is the Oberdorfer 700C compatible with?
This pump handles water, water solutions, light oils, and many mild solvents and commercial chemicals that are compatible with bronze and Buna (Nitrile) construction. For aggressive solvents, difficult chemicals, or temperatures near the 212°F maximum, optional fluoroelastomer (S10) or PTFE (S11) seals are available. Always verify chemical compatibility for specific fluids.
Q: Is a pressure relief valve required on the discharge side?
No. Because the 700C is a centrifugal pump, its flow is non-positive. This means the discharge can be fully shut off or throttled without risk of overloading the motor or bursting the discharge line, so a relief valve is not necessary.
Q: Can the Oberdorfer 700C handle viscous liquids?
Yes, up to a maximum of 2,000 Saybolt Seconds Universal (SSU). Keep in mind that as viscosity increases beyond water, flow rate and pressure output will decrease while required horsepower increases proportionally. For heavier-than-water liquids, additional horsepower may also be needed relative to the fluid's specific gravity.
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