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Explanation:
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Qn
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Normal flow (Nl/min).
Measured with upstream pressure 6 bar and the pressure drop 1 bar over the valve.
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C
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The C-value (l/(s*bar)).
Flow sonic conductance
Ratio of volume flow Q and input pressure p1abs for choked flow C=Q/p1abs
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b
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Critical pressure ratio
Ratio of output pressure p2abs and input pressure p1abs which marks the transition from choked flow (sonic velocity in narrowest section) to subsonic flow
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kv
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The kv-value.
Measured with water at a pressure drop 1 bar over the valve.
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Kv
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The Kv-value.
As above but expressed in m3/hr.
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Cv
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The Cv-value (US gallons/min).
Measured with water at a pressure drop 1 psi (0.07 bar) over the valve.
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