Meritor Wabco will supply two types of valves on Freightliner and Western Star models, 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 the air brake system. It also provides a blast of air to the urea nozzle at vehicle shut-down 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.
"Meritor WABCO recognized that air and coolant management would play a vital role in the integration of SCR emission systems on commercial vehicles," said Steve Hampson, director of compression and braking, Meritor WABCO. "We're excited that our expertise in advanced controls and valves can help DTNA meet increasing performance requirements for system air and vehicle coolant."