Fluid dynamics analysis and optimized throttling design of L-shaped multi-stage high pressure reducing valve

Traditional high-pressure pressure reducing valves are mostly linear, occupying a lot of space and costing a lot. In this study, a L-shaped multi-stage high pressure reducing valve (L-HPRV) is newly designed, it can be widely used in space constrained pipelines, reducing floor space and thus lower costs. Then, the steam flow in L-HPRV is investigated with an experimental validated numerical method. Next, a parametric sensitivity study is conducted to investigate the effects of typical throttling components on fluid dynamics of the newly designed L-HPRV. Finally, based on the parametric sensitivity study, the optimized throttling design of L-HPRV is achieved. The results show that the rhombus-shaped perforated plates is considered to be the first choice for better fluid dynamics. Larger perforated plate diameter (D₁/D₀) and perforated sleeve diameter (D₂/D₀) relates to better aerodynamic performance. Chamfer radius has limited effects on fluid dynamics. N-stage adjustable perforated plate effectively disperses the pressure drop and velocity rising gradient in the throttling components at all levels. The preferred level ranking with better fluid dynamics for L-HPRV is obtained.