38059-Satchwell Inter. Guide 05
38059-Satchwell Inter. Guide 05
38059-Satchwell Inter. Guide 05
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STEAM VALVE SIZING CHART<br />
Pressure drop<br />
Example for saturated steam:<br />
Flow : 4700 kg/h saturated steam<br />
Absolute Inlet Pressure : 850 kPa<br />
Pressure Drop : 160 kPa<br />
– Locate the crossing point between the line with starting point at absolute<br />
inlet pressure 850 kPa and the sloping line of 160 kPa pressure drop.<br />
– Locate the crossing point between the line with starting point at above<br />
crossing point and the line of 4700 kg/h flow.<br />
This point corresponds to flow coefficient Kvs 63, DN 65, therefore control<br />
valve must have size 65mm.<br />
CONTROLLI<br />
VALVE SIZING INFORMATION<br />
Critical pressure drop<br />
55<br />
Example for superheated steam:<br />
Flow : 140 kg/h superheated steam<br />
Absolute Inlet Pressure : 350 kPa<br />
Temperature : 209°C<br />
Pressure Drop : 100 kPa<br />
Calculate the superheating degree as follows:<br />
– Read the temperature value corresponding to 350 kPa (139°C)<br />
Superheating degree – 209 –139 = 70°C<br />
– Locate the crossing point (right side of diagram) between the line with<br />
starting point at superheating 70°C and the sloping line of 140 kg/h flow.<br />
– Locate the crossing point between the line with starting point at 350 kPa<br />
inlet pressure and the sloping line at 100 kPa pressure drop.<br />
– Locate the crossing point between lines with starting points.<br />
This point corresponds to flow coefficient Kvs 4.
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