text: The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate.
  Mathematically the flow coefficient  (or flow-capacity rating of valve) can be expressed as
  where
  :  is the rate of flow (expressed in US gallons per minute),
  : SG is the specific gravity of the fluid (for water = 1),
  :  is the pressure drop across the valve (expressed in psi).
  In more practical terms, the flow coefficient  is the volume (in US gallons) of water at  that will flow per minute through a valve with a pressure drop of  across the valve.
  The use of the flow coefficient offers a standard method of comparing valve capacities and sizing valves for specific applications that is widely accepted by industry. The general definition of the flow coefficient can be expanded into equations modeling the flow of liquids, gases and steam using the discharge coefficient.
  For gas flow in a pneumatic system the  for the same assembly can be used with a more complex equation. Absolute pressures (psia) must be used for gas rather than simply differential pressure.
  For air flow at room temperature, when the outlet pressure is less than 1/2 the absolute inlet pressure, the flow becomes quite simple (although it reaches sonic velocity internally). With  = 1.0 and 200 psia inlet pressure, the flow is 100 standard cubic feet per minute (scfm). The flow is proportional to the absolute inlet pressure, so the flow in scfm would equal the  flow coefficient if the inlet pressure were reduced to 2 psia and the outlet were connected to a vacuum with less than 1 psi absolute pressure (1.0 scfm when  = 1.0, 2 psia input).