Industrial expert's opinion is maximum torque required to actuate ball valve is "Torque ability to open under large differential pressure and to close under high flow conditions "My objective is to determine Actuation torque Vs Pressure drop curve (through digital prototyping) using CFD analysis tool.Design employ trunion mounted ball valve design approach and its stem are supported by bearings Flow rate: 17.2gpmOperating pressure: 60psiMax pressure drop at open condition: 0.5psidNow my question is how to built boundary conditions for CFD analysis and I carried out using following conditions in flow model to determine pressure drop for various opening angles but results are varying drasticallyUpstream condition 17.2gpmDownstream condition60psiUnknownWould request you all is this right method to analyze1. How ball valve is testing is done on test bench todetermine Torque Vs Pressure drop 2. Do I need to give Pressure drop 0.5psi at downstreamconditions as this requirement when ball is open conditions than analyze pressure drop for various opening angles3. Do i need to give Upstream conditions as 60psi anddownstream conditions as Flow rate 17.2gpm than analyze pressure drop for various opening angles.

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