Applying　hydrogen　fuel-cell　vehicles　(HFCVs)　is　feasible　to　achieve　net　zero　carbon　emission　in　transportation　sector.　The　energy　density　requirements　of　these　vehicles　are　fulfilled　via　high-pressure　gaseous　hydrogen　storage;　therefore,　an　effective　pressure-reducing　system　is　necessary.　In　this　work,　a　novel　multistage　pressure-reducing　valve　(named　as　T–M　valve)　combining　a　sleeve　pressure　structure　valve　and　a　Tesla-type　orifice　valve　is　proposed.　A　computational　fluid　dynamics　(CFD)　model　is　developed　to　analyze　the　influence　of　operating　parameters　on　pressure　and　velocity　distributions.　Results　show　that　the　large　pressure　and　velocity　gradients’　region　is　concentrated　on　the　throttling　elements.　The　valve　opening　and　pressure　ratio　significantly　affect　energy　consumption.　In　addition,　the　Mach　number　in　the　valve　less　than　one　is　proposed.　This　study　is　conducive　to　further　energy　conservation　and　emission　reduction　and　the　research　of　multistage　flow　pressure-reducing　devices.　©　2022　Hydrogen　Energy　Publications　LLC