GB.TBXZ342.130915
Registered design. The company reserves the right to make changes without prior notice.
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Important!
If the flow is outside the chart, it can be read as follows:
Assume the example above that reads 10 kPa, Kv=5 and a
flow of 1.6 m
3
/h. For 10 kPa and Kv=0.5 you read a flow
of 0.16 m
3
/h and for Kv=50 you read 16 m
3
/h. Therefore,
for every given pressure drop you can read 0.1 or 10 times
the flow and Kv.
Example
This chart shows the pressure drop across the valve. A
straight line that interconnects the scales for flow – Kv
- pressure drop constitute the relationship between the
different readings.
7. Chart
The position for each valve size can be obtained by plot-
ting a horizontal line from the value intersected on the Kv
scale.
Sought
Presetting for DN 25 and required 1.6 m flow
3
/h and pres-
sure drop of 10 kPa.
Solution
Plot a line between 1.6 m
3
/h and 10 kPa. This intersects
the Kv scale at KV=5. Then plot a horizontal line from Kv 5
to the DN 25 scale where you read 2.75 turns.
7.1 DN 32 – 50 (GOLD SD 12-80)
