Dec 7, 2010 9:59 AM

Meritor WABCO Vehicle Control Systems announced an agreement to supply Daimler Trucks North America LLC (DTNA) with advanced air and water management valves for commercial vehicles using SCR (selective catalytic reduction) aftertreatment to meet emission standards.

Meritor WABCO is supplying two types of valves on Freightliner and Western Star models with diesel engines using SCR, depending upon vehicle configuration:

•SCR Air-Management Valve: Controls, protects, and limits the air used from the braking system for urea injection, offering maximum protection of air brakes. It also provides a blast of air to the urea nozzle at vehicle shutdown to keep the urea injector clean and operational.

•SCR Water-Management Valve: Controls the amount of vehicle coolant used by the SCR system to heat the urea tank and prevent the DEF from freezing. Coolant is also used to cool the injector assembly and pump system on certain SCR systems.