HEALTH & SAFETY
conditions, hot or cool coolant is circulated through a heat exchanger inside the DEF tank, providing enough heat to keep DEF from freezing, thawing it if it has already frozen or cooling it if the temperature is in danger of getting too high.
OPERATING IN HARSH CONDITIONS TLX Technologies was approached to design a coolant control valve for an SCR thermal management system for off -road logging vehicles. The valve needed a maximum fl ow rate of 0.5 L/s to be able to handle operating pressures up to 500 kPa, as well as be reliable in harsh conditions like vibration, submersion and debris. TLX developed
Schematic of a DEF system with active heating and cooling
two versions of this valve: one with an IP65 rating, making it dust-tight and water resistant, and a second with an IP67 rating, making it dust-tight and fully submersible to one metre for 30 mins. The higher-rated version was needed for vehicles operating in circumstances
where the valve could be submerged in water, such as during fl ooding or when crossing a stream.
MANAGING FLUID CONTAMINATION Because logging vehicles are subject to so much dirt and debris, fl uid contamination is always a challenge. TLX designed this valve with a custom diverter to route debris in the coolant away from critical internal valve components, ensuring reliable operation in diff icult conditions. Increasing regulatory pressures
sometimes drive innovation, as has the complexity introduced to diesel vehicles by emission control systems. As such engineering ingenuity is required for optimal performance and reliability. As environmental standards evolve, robust engineering becomes not just a compliance requirement but a competitive advantage.
For more information visit:
www.tlxtech.com
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www.engineerlive.com 27
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