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AlliedSignal Fluid Systems has provided fuel metering valve hardware to three aircraft engine manufacturers for evaluation. Two of the programs were Integrated High Performance Turbine Engine Technology (IHPTET) related. The third program was an IR&D effort. Bench test and evaluation of all three valve designs have been completed, and one of the designs has actually been used for engine test. Engine testing of the other two valve designs is planned for the future. These three designs are similar, but each is intended to be used in different system configurations, and each valve design offers unique features.

Limitations on designs are often determined by the properties of the materials used rather than the inventiveness and creativity of the designer or engineer. The designer or engineer may choose a material that possesses all of the essential properties such as strength, weight, and rigidity, while embodying only selected surface properties such as hardness, wear resistance, and conductivity. Selecting the appropriate coating will produce beneficial, engineered surface properties. In general, the suitability of any coating depends on its purpose. Unfortunately, some coatings or combinations of coatings introduce detrimental features to characteristics of the other coatings or even the base material itself. Our goal is to provide a functional, corrosion resistant, metal finishing system consisting of the application of two different coatings which act synergistically to provide enhanced corrosion- and wear resistance.