Control systems Pressure reducing/surplussing valves
4
Sizing and selection for water applications
The sizing chart below can be used to determine the Kv value of the valve for water applications by plotting: - Maximum flowrate. - Maximum valve pressure drop.
Where the Kv value is known, the chart can be used to determine pressure drop across the valve for any given flowrate. Kv sizing example: Maximum flowrate 10 m 3 /h. Maximum allowable pressure drop 0.3 bar.
Draw a horizontal line A - B at 10 m 3 /h. Draw a vertical line C - D at 0.3 bar pressure drop. At intersection E , read the required Kv = 19. Valve size required DN40 having the next highest Kv of 24.
Note: The sizing chart is empirical and should not be used for critical applications.
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Example line A
Pressure drop kPa
Pressure drop m wg
Pressure drop bar
TI-P205-01 CTLS Issue 12
Page 7 of 11
DEP7 SG Iron Excess Pressure Valve
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