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Control systems Pressure reducing/surplussing valves
Sizing and selection for steam applications The sizing chart below can be used to determine the Kv value of the valve for steam applications by plotting: - Upstream pressure. - Maximum valve pressure drop. - Maximum steam load. 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 1 500 kg/h Upstream pressure 9 bar g (10 abs) Maximum pressure drop 0.5 bar Draw a horizontal line A - B at 10 abs. At intersection with 0.5 pressure drop draw a vertical line C - D . Draw a vertical line E - F at 1 500 kg/h. At intersection G , read the required Kv = 28. Valve size required DN50 having the next highest Kv of 40.
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Example line A
Note: The sizing chart is empirical and should not be used for critical applications.
TI-P206-01 CTLS Issue 13
Page 8 of 13
DEP4 Cast Steel Excess Pressure Valve
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