The needle valve body is a key component in the engine nozzle coupler. The sealing condition of the hole seat surface and the needle valve joint surface in the needle valve body directly affects the atomization quality of the fuel and plays a decisive role in the working performance of the engine. The hole seat surface of the needle valve body is located at the bottom of the narrow and deep hole (Fig. 1), and the actual measurement is difficult. Therefore, it is of great significance to seek a set of effective measurement methods and to develop a high-precision and practical comprehensive measurement system for mesoporous surface position and position errors.
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