Flow direction
The direction of flow, specified by an arrow on the housing, is to be complied with,
since otherwise the flow rate will be measured incorrectly.
Inlet section
In order to achieve the specified measuring accuracy, a flow-calming section or inflow
section in the direction of the flow is to be provided upstream from the flow sensor. Its
dimensions should be at least 5x DN.
DN L min.
65 5 x 65 mm = 325 mm
80 5 x 80 mm = 400 mm
100 5 x 100 mm = 500 mm
125 5 x 125 mm = 625 mm
150 5 x 150 mm = 750 mm
L ≥
5
x
DN
General notes
Valve selection
The valve is determined using the maximum required flow rate Vmax.
A calculation of the kvs value is not required.
Vmax = 30…100% of Vnom
If no hydraulic data are available, then the same valve DN can be selected as the heat
exchanger nominal diameter.
Minimum differential pressure
(pressure drop)
The minimum required differential pressure (pressure drop through the valve) for
achieving the desired volumetric flow max can be calculated with the aid of the
theoretical kvs value (see type overview) and the below-mentioned formula. The
calculated value is dependent on the required maximum volumetric flow max. Higher
differential pressures are compensated for automatically by the valve.
Formula
min
= 100 x
max
k
vs theor.
min
max
: m
3
/h
k
vs theor.
: m
3
/h
Example (DN100 with the desired maximum flow rate = 50% nom)
min
= 100 x
max
2
= 100 x = 10 kPa
36 m
3
/h
2
. = 115 m /h
nom = 1200 l/min
50% * 1200 l/min = 600 l/min = 36 m /h
3
3
k
vs theor.
115 m
3
/h
EP..F+MP
Electr. 2-way PI-CCV EPIV, Flange, PN 16
Installation notes
www.belimo.com
EP..F+MP • en-ap • 2019-06-03 • subject to changes
9
Behaviour of sensor failure
In case of a flow sensor error, the EPIV will switch from flow control to position
control. Once the error disappears, the EPIV will switch back to the normal
control setting.
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