Filters play a decisive role for the functionality and working life of engines in all kinds of vehicles. All working fluids like fuels, oil, and air for cooling must be free of particles and water. Modern injection systems for diesel fuel operate at extremely high pressures. Particles will destroy the injection pumps within a short time.
Modern engines are equipped with exhaust gas recirculation systems to reduce emissions and fuel consumption. Here particle filters are necessary for maintaining the lifetime of valves.
New drives that work on the basis of natural gas, liquified natural gas (LNG), or hydrogen also demand particle-free fuels. This is ensured by our fuelling filters and coalescers. Seebach even manufactures special filters to meet the highest demands on reliability and purity, for formula 1 cars for example.
In addition, we support the servicing of passenger cars and commercial vehicles with our robust and durable filters for exhaust gas test benches.
Exhaust gas filtration
Exhaust gases are led back into the combustion chamber in order to reduce fuel consumption and emissions of nitrous gases. Aggressive gas contaminants, particles, and the high temperature impose high requirements on filter materials. We use different types of stainless steel and special materials like titanium and titanium alloys for these applications. In combination with a reliable welding technique, these materials ensure the functionality and durability of our filters.
The higher degree of purity specified for diesel exhaust gases by the new emission standard EURO7 has led to the further development of exhaust gas treatment systems. In the new design, the exhaust gas recycling valve is located between the diesel particulate filter and the turbo charger. The gas flow at the entry of the turbo charger can contain pollutants from the catalyst system. Our specially developed exhaust gas filters are installed in the exhaust pipe to prevent these pollutants from damaging the turbo charger.
Engines that use natural gas, LNG, or even hydrogen as fuel, require gases that are free from particles, oil, and water for safe and smooth operation. The main goal of particle filtration is protecting the operation of valves and engine components. Our filer systems, which are adapted to all conditions, ensure a particle-free gas flow throughout the whole supply system to the point the fuel enters the vehicle. Specifically, this means that the filtration is integrated in the pump nozzle that is inserted in a vehicle’s fuel tank, as well as within the pipes for filling the on-site storage tanks.
In diesel engines, the fuel is injected into the combustion chamber with a pressure greatly exceeding 1,000 bars. The precision of manufacturing tolerances increases as injection pressure increases because only high-precision injectors can operate without leakage under the prevailing conditions. Consequently the demands for particle-free and water-free diesel fuels have also increased. Engines and drive units that are operated all over the world have to cope with different local fuel qualities. Our fuel filters are employed as Last-Chance filters just in front of the injection system, so that they ensure that the fuel quality required by the supplier of the injection system is met independently of locally or temporally fluctuating fuel qualities at the filling nozzle.
But it is not only particles or free water that can damage high pressure equipment. Pulsation occurs during the injection process, due to the opening and closing in the individual nozzles. Abrasion-resistant pulsation dampers made from porous media are installed in order to dampen unwanted pressure peaks.