General information Useful calculation data
7
How to use the chart Example 1: How to find K v value for a critical flow application. Steam demand of heat exchanger = 800 kg/h Steam pressure upstream of valve = 8 bar g = 9 bar a Steam pressure required in exchanger = 3 bar g = 4 bar a
Using the selection chart: Draw a horizontal line from 800 kg/h Draw a horizontal line from 9 bar a to the critical pressure drop line, which is reached before a pressure drop line for (9 - 4 = 5 bar) and drop a vertical line from the intersection to meet the 800 kg/h horizontal. Read the K v at this crossing point, i.e. K v = 7.5 Refer to the K v values given on the appropriate Technical Information Sheet for each valve type.
SA (self-acting), EL (electric/electronic) and PN (pneumatic) valves may be selected using their maximum Kv values.
Example 1
7.5 10
11.5.7
Example 1
A complete sizing chart is shown on page 5.
For Water Sizing Chart see TI-GCM-09
TI-GCM-08 CM Issue 2
Page 2 of 5
Saturated Steam Sizing Chart
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