DEF Supply Pump for SCR Systems - Specifications and Verification

Product Specifications

Technical details and manufacturing context for DEF Supply Pump

Definition

The DEF Supply Pump is a critical component within the DEF/AdBlue Injection System of modern diesel engines equipped with SCR technology. Its primary function is to draw Diesel Exhaust Fluid (a urea-water solution) from the vehicle's storage tank and deliver it under pressure to the dosing module or injector. This precise delivery is essential for the controlled injection of DEF into the exhaust stream, where it decomposes to form ammonia, enabling the catalytic reduction of nitrogen oxides (NOx) into harmless nitrogen and water vapor, thereby meeting stringent emissions regulations. The pump is typically an electric diaphragm or piston type, activated by the vehicle's Engine Control Unit (ECU). It creates suction to draw DEF from the tank, pressurizes the fluid, and delivers it through supply lines. Integrated features often include a filter and a heater to prevent DEF from freezing or crystallizing, ensuring reliable operation in various environmental conditions. The pump is designed to operate within a flow rate range of 15–60 L/h, an operating pressure of 1.0–1.6 MPa, and a supply voltage of 9–36 V DC (referenced to ISO 16750-2). Power consumption is ≤50 W at nominal voltage and maximum flow. Operating temperature ranges from -40 to 85 °C (referenced to ISO 16750-4), with fluid temperature between -11 and 50 °C to keep DEF liquid. Ingress protection is IP54–IP65 (IEC 60529), noise level ≤65 dB(A) at 1 m (ISO 3744), weight 1.2–2.5 kg depending on integrated heater, and lifetime ≥20,000 hours under normal operating conditions. Wetted parts are typically made of stainless steel, with engineering plastics for housing and diaphragm, and synthetic rubber for seals and diaphragm. These values are directory reference ranges; verify model-specific specifications with the legal manufacturer or supplier.

Working Principle

The DEF Supply Pump is typically an electric diaphragm or piston pump. It is activated by the vehicle's Engine Control Unit (ECU). The pump creates suction to draw Diesel Exhaust Fluid (DEF) from the storage tank, pressurizes the fluid, and delivers it through supply lines to the dosing module or injector. Integrated features often include a filter to remove contaminants and a heater to prevent DEF from freezing or crystallizing, ensuring reliable operation in various environmental conditions. The pump's operation is essential for the precise delivery of DEF into the exhaust stream, enabling the SCR system to reduce NOx emissions effectively.

Common Materials

Stainless Steel (wetted parts), Engineering Plastics (housing, diaphragm), Synthetic Rubber (seals, diaphragm)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Rate	15–60 L/h	Required to meet SCR dosing demand
Supply Voltage	9–36 V DC	For 12V and 24V systemsISO 16750-2
Power Consumption	≤50 W	At nominal voltage and max flow
Operating Temperature	-40–85 °C	DEF freezes at -11°C; heater requiredISO 16750-4
Fluid Temperature	-11–50 °C	DEF must remain liquid
Ingress Protection	IP54–IP65	Protection against dust and water jetsIEC 60529
Noise Level	≤65 dB(A)	At 1m distanceISO 3744
Weight	1.2–2.5 kg	Depending on integrated heater
Lifetime	≥20000 h	Under normal operating conditions

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Electric Motor
Provides the rotational force to drive the pumping mechanism.

Material: Copper windings, steel casing
Pumping Mechanism (Diaphragm/Piston)
Creates the suction and pressure cycles to move the DEF fluid.

Material: Stainless steel, engineered plastic, synthetic rubber
Inlet/Outlet Valves
Check valves that ensure one-way flow of DEF into and out of the pump chamber.

Material: Stainless steel, synthetic rubber
Integrated Filter
Filters particulate contaminants from the DEF before it enters the pump.

Material: Synthetic filter media, plastic housing
Heating Element
Prevents DEF from freezing or thawing frozen DEF in the pump assembly.

Material: Stainless steel sheath, ceramic insulator

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for DEF Supply Pump.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

DEF/AdBlue Injection System

View system integration details

Manufacturers of DEF Supply Pump

Manufacturer profiles associated with DEF Supply Pump.

Sourcing DEF Supply Pump from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the primary function of the DEF Supply Pump?

The DEF Supply Pump draws Diesel Exhaust Fluid (DEF/AdBlue) from the storage tank and delivers it under pressure to the dosing module or injector in a selective catalytic reduction (SCR) system. This ensures precise injection of DEF into the exhaust stream for NOx reduction.

What are the typical operating pressure and flow rate ranges?

The directory reference ranges are 1.0–1.6 MPa for operating pressure and 15–60 L/h for flow rate. These values must be confirmed for the specific model and application with the legal manufacturer or supplier.

What standards are referenced for the DEF Supply Pump?

Referenced standards include ISO 16750-2 for voltage, ISO 16750-4 for temperature, IEC 60529 for ingress protection, and ISO 3744 for noise. These are procurement references and do not imply certification or compliance.

Why is a heater integrated into the DEF Supply Pump?

DEF freezes at -11°C. The integrated heater prevents the fluid from freezing or crystallizing, ensuring reliable pump operation in cold environments. The operating temperature range is -40 to 85 °C, and fluid temperature must remain between -11 and 50 °C.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for DEF Supply Pump

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Up to 10 bar (typical), 15 bar maximum
flow rate:	0.5 to 20 L/hour (depending on engine size and SCR system)
temperature:	-40°C to 85°C (with heating elements for cold climates)
slurry concentration:	Not applicable - DEF must remain pure, no solids allowed

DEF Supply Pump

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards