What is a DEF dosing unit?

What is a DEF dosing unit?

Diesel Exhaust Fluid (DEF) Dosing Valve Allows a fine mist of DEF to be sprayed into the exhaust stream of the Decomposition Reactor. Decomposition Reactor converts DEF into ammonia (NH3) through hydrolysis.

Where is the DEF doser valve?

The DEF doser found on the ISX15 is mounted on the pipe connecting the DPF to the SCR visible behind the DPF. No DPF heat shields need to be removed to access it, it is facing the driveshaft.

Can you clean a DEF dosing valve?

You have two options when it comes to cleaning your doser valve. You can either can get it cleaned at a dealership or repair facility, or you can do it yourself. Cleaning the doser valve yourself can be relatively straightforward and cost-effective. With a cleaner doser valve, you will be operating at an optimal level.

What does the DEF dosing valve do?

The dosing valve is controlled by the computer and delivers precise amounts of DEF fluid to the decomposition reactor. The DEF fluid injected by the dosing valve is atomized into a fine mist and converted into ammonia while in the decomposition reactor.

How does Cummins aftertreatment work?

How does an aftertreatment system work? The exhaust progresses from the Decomposition Reactor into the SCR system which converts the toxic NOx and urea mixture into harmless nitrogen gas (N2) and water vapor (H2O), which effectively eliminates harmful emissions resulting in near zero emissions from the exhaust.

How often does a DEF pump run?

How often do you need to clean and replace the DEF filters? The frequency of this service varies by type of equipment and brand. Many forklift manufacturers require the DEF (diesel exhaust fluid) pump filter to be cleaned every 1,000 hours and the tank cleaned and filter replaced every 2,000 hours.

What does catalyst dosing unit mean?

The dosing unit, or injector, is a robust component that delivers an atomized urea and air mixture upstream of the SCR catalyst. The design allows injection in the center of the exhaust gas flow, which minimizes the risk of deposits and improves reliability.

What is a seventh injector used for?

The “seventh injector” mainly appears on the engine after the DPF is used to process the fuel-assisted combustion regeneration technology.

How do you clean def crystals?

If you spill a small amount of Diesel Exhaust Fluid (DEF), it can be washed away with water or wiped up. If you leave it to dry it will turn into white crystals. These can be washed away with water. If you spill a large amount of DEF then contact your DEF supplier for advice.

What is regeneration in aftertreatment?

Regeneration is a process used to remove Carbon (C) build up from the DPF catalyst. This process occurs on a regular frequency that varies based on system and application. This is due to better engine tuning and DPF catalyst technology improvements.

What is aftertreatment Doc?

The DOC is the first device in the after treatment system. It is a flow through filter that contains precious metals to start the oxidation of hydrocarbons, carbon monoxide and unburned fuel and oil.

What is diesel exhaust fluid and how does it work?

How Diesel Exhaust Fluid Works: When injected into the exhaust stream with a specialized dosing module, BlueDEF’s water vaporizes, leaving ammonia molecules en route to the catalytic converter; once there, it converts NOx molecules into harmless nitrogen and water vapor—making for cleaner emissions.

What year trucks require Def?

What Year Chevrolet and GMC Trucks Require DEF? In 2007, Duramax produced a 6.6L engine with new diesel particulate filter technology. However they didn’t start using DEF until 2010 in response to 2010 EPA regulations. In 2011 General Motors released the latest in its Duramax line, labeled the LML. This version introduced advanced emission controls, including diesel exhaust fluid injection.

What is the purpose of diesel exhaust fluid?

Diesel exhaust fluid, or DEF, is designed for use in SCR systems to reduce nitrogen oxide emissions. It is a urea-based chemical produced from raw fossil fuel sources such as natural gas, coal, and a variety of other petroleum based products by dissolving solid urea of high purity in de-ionized water.

Is diesel exhaust fluid dangerous?

Diesel Exhaust Fluid (DEF) is not toxic, harmful or dangerous. In fact, of all the fluids used in a truck, such as diesel, engine oil, brake fluid, antifreeze and windscreen wash, DEF is the least hazardous.