Control valves

Pressure reducing/surplussing valves

Sizing and selection for water applications

The sizing chart below can be used to determine the Kv value of the valve for water applications by plotting:

-

Maximum flowrate.

-

Maximum valve pressure drop.

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 10 m

3

/h.

Maximum allowable pressure drop 0.3 bar.

Draw a horizontal line A - B at 10 m

3

/h.

Draw a vertical line C - D at 0.3 bar pressure drop.

At intersection E, read the required Kv = 19.

Valve size required DN40 having the next highest Kv of 24.

Example

line

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A

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Note: The sizing chart is empirical and should not be used for critical applications.

TI-P206-01 CH Issue 12

DEP4 Cast Steel Excess Pressure Valve

Page 5 of 8

4.6.58