1938-01-01

Wear Reduction of Valves and Valve Gear 380162

THE factors affecting the rate of wear of valves and valve gear are summarized. Reasons for recent marked improvements in the life of aircraft valves are discussed. Surface finish developments are described that are designed to decrease the initial rate of wear. Ten means of getting close initial clearance are outlined. Progress of work in three laboratories on surface treatments is reported. The relative amount of wear with various material combinations is compared.

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