Applications in the aerospace sector pose highest demands on the thermal, chemical, and mechanical resistance of filter systems. Depending on the application site, extremely high temperatures as well as temperatures well below freezing are possible. Operating media and fuels for such applications must meet high standards with regard to the concentrations of particles and free water.
The chemical composition of fuels and lubricants is adapted to harsh environmental conditions and thus challenges the chemical resistance of filter materials. Aggressive media, together with extreme temperatures, make the use of high alloy steels, titanium, and special materials necessary. The requirement to minimize the weight of components can best be fulfilled by using aluminium.
Filtration of gear oils
Just as with land vehicles, fluids for engines and gears operating In aerospace are continuously cleaned, but with higher requirements on functionality and operational safety under extreme conditions. This includes, for example, the filtration of gear oils in helicopters. Here low pressure losses and high filtrate fluxes are demanded for temperatures down to -40°C. Without this ability, quick starts for emergency response, e.g. in mountain rescue or military operations, would be impossible.
Aviation fuel must be free of particles and water when entering the combustion chamber. This is essential for the protection of turbines and other important components against corrosion. If an aircraft stays on the ground for several days, bacteria may proliferate due to existing humidity and form bio-films which stick fast to surfaces and affect smooth operation. Stainless steel filters for particle removal and coalescers for oil-water separation are major contributors to the protection of important components. In space technology, filter elements provide important services in fuel management in the form of passive propellant management devices. These are systems which make the defined transfer of bubble-free, liquid fuel from the tank to the combustion chamber.