Control valves (a fortiori when operating under conditions of high pressure drop) can contribute significantly to industrial & process plant noise, namely due to aerodynamic noise generation depending on valve data & process data, main parameters being as follows:
- Valve inlet absolute pressure
- Valve outlet absolute pressure
- Liquid pressure recovery factor of a valve with or without attached fittings
- Pressure differential ratio factor of a control valve with or without attached fittings at choked flow
- Valve style modifier
- (Required) Flow coefficient
- Acoustic power ratio or Valve correction factor for acoustical efficiency
- Molecular mass of flowing fluid
- Inlet absolute temperature
- Density of fluid at inlet
- Specific heat ratio
- Mass flow rate
- Strouhal number
- Outlet absolute temperature
- Density of fluid at outlet
- Speed of sound at downstream conditions
- Valve outlet diameter
- Internal downstream pipe diameter
- Contraction coefficient for valve outlet or expander inlet
When valve style modifier is not an available explicit input data, additional parameters must be accounted
- Area of a single flow passage
- Wetted perimeter of a single flow passage
- Number of independent and identical flow passages in valve trim
When flow indicators are not available explicit input data, additional parameters must be accounted
- Liquid pressure recovery factor of a valve without attached fittings
- Upstream inside pipe diameter
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