12
Multi Display –
When an Automatic Balancing Valve is Selected
Unique to the AC6 is the ability to display variables associated with automatic balancing valves. The
valve shown is an externally adjustable type.
The design flow for any automatic flow controller will be achieved if the differential pressure across
the valve reaches the design value. Each automatic balancing valve and each setting for the valve
will possibly have a different design DP. The AC6 database holds the design DP for each
valve/setting. Many of the automatic balancing valves programmed into the AC6 have their actual
characteristic in the data. The level of differential pressure across the valve will determine which
data is used. Generally, with automatic valves there is a slight fall in flow when the DP reaches high
values. This fact is true for most automatic valves but normally the fall in flow is within the stated
tolerance for the valve.
When the AC6 is adjusted to select the correct valve/setting, the design flow is displayed within the
valve image. If the DP is not sufficient to create correct flow conditions, the box above the inlet pipe
to the valve will display an up arrow and a value indicating that the DP will need to be increased to
achieve the design flow. The value displayed is the design DP less the actual DP.
In the event of the actual DP being higher than the design DP, the box will display a down arrow
and a DP value that suggests a reduction in actual DP. On an Index circuit, this would suggest that
the pump speed could be decreased to achieve the correct DP value.
ZERO DP
0.210 L/S
FLOW
LOW
5.0
8.48 kPa
Flowcon Green ‘0’
7.52
0.153 L/S
16.0
Indicates that DP must be
raised to achieve design
flow. Arrow will point down
if pressure can be lowered.
DP required to achieve
design flow.
Scrolling arrows
indicate ‘some’ flow.
Arrows will continue to
outlet pipe when
design flow achieved.
Design flow for
this setting.
Current
flow status.
Setting Tab shows
current setting. Use
▲
to
edit. Not shown if the
valve is fixed setting.
Current DP across valve.
Current valve
selection.
Actual flow for this
setting.
