• Structural design of a combined steam pressure reducing valve based on energy arrangement featuring a labyrinth and orifice plate formation. • Systematic investigation of the quantitative relationship between pressure ratio and aerodynamic noise. • Study of the optimal pressure ratio for combined steam pressure reducing valves under high-temperature and high-pressure conditions. • Identification of coupling effects among structural parameters in steam pressure reducing valves. Under extreme conditions characterized by high temperature, high pressure, and large flow rates, steam flow exhibits complex behaviors that generate significant aerodynamic noise and structural vibrations. These effects reduce the valve’s fatigue life and compromise system reliability. The study investigates an integrated configuration combining labyrinth passages with orifice plate, designed to enhance both flow regulation capability and noise suppression performance. Through an optimized structural arrangement and pressure drop distribution, the study demonstrates that the labyrinth + orifice plate design improves flow stability and reduces aerodynamic noise by 4.2 dB. Furthermore, an additional noise reduction of 1.1 dB is achieved when the pressure drop ratio between the two components is adjusted to 1.5. The results highlight the distinct performance profiles resulting from various valve assembly configurations, underscoring the strong influence of layout on overall behavior. The work provides a theoretical foundation and practical design guidelines for developing compact, low noise steam pressure reducing valves.
Gan et al. (2026) studied this question.