Doser Valves | Pumps

Keep your emission system running at peak performance with high-quality DEF doser valves and exhaust doser pumps from American Radiator. These components play a vital role in Diesel Exhaust Fluid (DEF) delivery, ensuring accurate metering and precise injection within your Selective Catalytic Reduction (SCR) system. By maintaining proper DEF flow and pressure, they help reduce harmful emissions and ensure your equipment stays EPA compliant.

Our replacement doser valves and doser pumps are built for heavy-duty trucks, buses, and construction equipment. Designed to handle extreme heat, vibration, and demanding work environments, each part ensures long-term reliability and accurate DEF atomization. Every unit undergoes strict quality testing to meet or exceed OEM performance standards for brands such as Cummins, Volvo, Mack, Freightliner, and Detroit Diesel.

While American Radiator does not manufacture these components, we source premium aftermarket options that meet the same standards as factory replacements. Backed by expert service and fast nationwide shipping, our team ensures your DEF and SCR systems stay efficient and dependable.

For unmatched durability and precision in doser valves and pumps, trust American Radiator—your partner in heavy-duty emission control solutions.

FAQ'S

What is a doser valve or pump in a DPF system?
A doser valve (also called SCR injector pump) delivers a precise amount of Diesel Exhaust Fluid (DEF) into the exhaust stream to enable proper NOx conversion in the Selective Catalytic Reduction (SCR) system. It ensures emissions compliance and optimal system performance.

How do I choose the correct doser valve or pump?
Match the flow rate, pressure rating, mounting style, electrical connector, and compatibility with your engine’s DEF control system. Use OEM part numbers or cross-reference charts to ensure precise fitment.

What causes doser valve or pump failure?
Common causes include contamination in DEF (impurities or water), freezing conditions, clogged filters, corrosion, electrical faults, or wear from cyclic operation. Proper DEF quality and system maintenance are critical.

Can I replace just the doser valve without servicing the entire SCR system?
Yes — often replacing the valve or pump alone is sufficient if the rest of the system (sensors, heater lines, filters) remain in good condition. However, inspect associated components for wear or damage when servicing.

What symptoms indicate a faulty doser valve or pump?
Signs include DEF dosing errors, engine derate, emissions or check-engine warnings, poor NOx conversion, or fluid leaks around the valve. Prompt replacement helps restore SCR function and compliance.