Type 8763

11 | 13

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How to determine the required flow rate (example)

Nominal size control valve 0.3 mm1.)

Calculation

0.000

0.500

1.000

1.500

2.000

2.500

3.000

3.500

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

p2/p1

3 bar

2.5 bar

2 bar

1.5 bar

1 bar

0.5 bar

Ratio

0.15

0.88 l/min

Sizing of the pressure regulator

Below are some notes on sizing the supply pressure

and target pressure to a desired dosing rate. It should

be noted that real pressures must be higher because

the calculation cannot consider the individual friction

loss of the lines in the application.

Step #1 | Calculating the flow rate

Example application with a dosing shot of 15 ms

and 220 µl volume

(220 µl / 15 ms) x 1000

= 14666 µl/s x 60

= 880000 µl/min

= 0.88 l/min flow rate

Step #2 | Ratio target pressure / supply pressure

DN 0.1 is too small



DN 0.3 mm minimum required

Note: A low target pressure (300…500 mbar) has a

beneficial effect on the dosing accuracy.

Step #3 | Determine supply pressure p1

1.) p2 = target pressure; p1 = supply pressure

6.

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