General information Useful calculation data
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2019
TI-GCM-09 CM Issue 2
Water Valve Sizing Chart
Note:
= K V √ P 1 = Water flow (m 3 /h) P 1 = Pressure drop across the valve (bar) K V = Flow coefficient (m 3 /h bar).
This chart assumes no cavitation after the control valve.
How to use the chart Note: the chart below is used for the following example only. A complete chart is shown overleaf. Example: The heat exchanger has a MTHW demand of = 10 m 3 /h The full-load pressure drop P 1
= 50 kPa (Established from 'Valve authority' (see page 2)
Go to the selection chart below: - Draw a horizontal line from 10 m 3 /h - Run a vertical line from 50 kPa until it crosses 10 m 3 /h line. - K v is given at this crossing point i.e. K v 14
7.5 15
Refer to the K v values given on the appropriate Technical Information Sheet for each valve type. SA (self-acting), EL (electronic) and PN (pneumatic) controls should be sized on maximum K v value.
Example
11.5.12
Pressure drop kPa
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