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In recent years, aerospace engines under severe conditions such as high and low temperatures, ultra-high pressure, intense vibration, reuse requirements, have strict and high demands on the reliability of piping systems both in do-mestic and abroad. It is urgent to develop pipe seals with high-pressure capability, wide-temperature-range adaptability, vibration resistance. In the study, a seal joint with self-tightening cantilever structure for piping system is introduced and compared with other structures in the aspect of geometric characteristics, sealing performance and applications. The structure was then preliminarily dimensioned using the virtual orthogonal experiment method. By employing numerical simulation, the strength, stress and strain distribution under different compression ratio are obtained. The design structural parameters are theoretical verified by simulation with a maximum plastic strain of 0.093 during repeated use and a rebound rate of 89.95%. Leaking tests of the self-tightening seal joints under air gas and hydraulic water are carried out. Ten repetitions of the leakage tests were also carried out. The comparative results of experiments and simulation results show that the seal joints are reliable. The research results also indicate that the self-tightening seal joints have an excellent load-bearing capacity, environment adaptability, stability and are easily removeable and reusable when used in piping system. The self-tightening pipe seal joint has a potential of superior performance in aerospace engine piping systems in future.
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