The following review of common automotive lubricant classifications helps to give an overview of the options currently available.
Perfluoropolyethers
Perfluoropolyethers (PFPEs) are a class of synthetic lubricants that, due to their unique combination of physical and chemical properties, are used in a variety of demanding applications. PFPEs offer excellent thermal and chemical stability, low volatility and unmatched lubricity at extreme temperatures.
They are the ideal choice when high performance is needed in an extreme environment. They are often also the lubricant of choice for applications requiring other properties, such as chemical inertness and extreme pressure capability. Vehicle warranties can typically be extended due to the long-lasting performance of PFPEs.
In comparison with other lubricants, PFPE lubricants stand out as high-performance solutions.
What Puts PFPEs First
Due to these unique benefits, high-performance PFPE lubricants excel in the demanding conditions of the engine’s air management system. This creates a ripple effect of value. Component failures and warranty claims are reduced, vehicle life is extended, quality is improved, customer loyalty is boosted and, ultimately, profitability is increased.
Ensuring EGR Emissions Excellence
A key target for design engineers – and one that is being legislated by governments around the world – is the reduction of NOx emissions.
The EGR valve reduces the formation of these emissions by recirculating some of the exhausted gas back into engine cylinders. This lowers the peak temperature inside the cylinder, thereby, reducing the rate of NOx formation.
- WIDE OPERATING TEMPERATURE RANGE
- PROVEN EXTENDED BEARING LIFE
- LONGER WARRANTY PERIODS
- RESISTANCE TO AUTOMOTIVE FLUIDS
- Multiple grade options
- ENVIRONMENTALLY AND USER FRIENDLY
It is essential to use a reliable and durable lubricant to extend valve service life. If the valve doesn’t open enough, insufficient recirculation can lead to excess pollution. However, if the valve sticks open, the temperature inside the cylinder can drop too much – decreasing engine performance and fuel mileage. Effective lubrication is once again key to ensuring optimum performance.
PFPE lubricants have become an ideal choice in the industry, as they withstand the high temperatures and exhaust fumes experienced by the EGR valve.
Linear (Poppet/Stroke) Type Valve: Convert High Speed Rotary to Low Speed Linear Motion
High wear and fretting can be an issue in the low speed section.
The optimal lubricant can vary significantly with engine type, valve design and location in the exhaust system (high pressure versus low pressure loop with or without EGR cooler).
The lubricant solution in this application needs to withstand temperature ranges from -40 to 260 °C. Besides the high temperature range, the selected lubricant needs to offer full seal compatibility.
The optimal lubricant can vary significantly with engine type, valve design and location in the exhaust system (high pressure versus low pressure loop with or without EGR cooler).
The lubricant solution in this application needs to withstand temperature ranges from -40 to 260 °C. Besides the high temperature range, the selected lubricant needs to offer full seal compatibility.
Designed to Succeed
Reliability under harsh conditions is essential for the success of the EGR valve. Performance lubrication specialists at Chemours deliver a range of high-specification grease solutions designed to improve lubricant durability, extend reliable valve service life and boost EGR valve performance.
As an example, a German manufacturer of gear-operated EGR valves chose Krytox™ Performance Lubricants to find a solution able to cope with temperatures ranging from -40 to 260 °C, as well as heavy vibration. Adopting a collaborative approach to the challenge, a specific Krytox™ high–temperature grease grade was chosen to fix the particular valve issue. This improved reliability and, as a result of savings on lubricants and warranty claims, contributed over €80,000 to the bottom line annually.
Flowing in the Right Direction
In conditions of extreme temperature and pressure, under severe shock loads or when exposed to harsh chemicals, there are multiple ways that PFPE lubricants can meet the demands placed on design engineers to improve engine compartment performance and reliability.
Over the last 50 years, Krytox™ Performance Lubricants from Chemours have helped customers outpace the competition by bringing customized and innovative solutions into an increasingly competitive automotive industry.
Our family of PFPE synthetic high-performance lubricants exhibits long-term wear resistance, superior lubricity, thermal stability in broad temperature ranges and chemical resistance in the most
severe environments.
To explore how Krytox™ Performance Lubricants can deliver real results in automotive applications, download The White Paper proposed by the Chemours Company. Download it today!
