Hydronix Hydro-Control VI, Installation Manual

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Hydro-Control VI Installation Guide HD0455 Rev 1.9.0 55
Chapter 5 System Design
1 Water Valves
1.1
Introduction
While the Hydro-Control can work with a single water control valve, optimum performance will
only be achieved with:
• A coarse valve to rapidly bring the moisture level near to target
• A fine valve to trim the moisture level to the target without overshoot
It is essential that the valves are correctly sized and flow rates correctly adjusted with
respect to the mixer capacity and efficiency.
Fine valve
Coarse valve
Pressure reducing
valve
Bypass valve
Water meter
Water input
Output to mixer
Water meter should be lower than
the input water pipe so it always has
water in the line
Adjust the water pressure
for the fine valve
Water filter can
be added to
reduce the risk of
damage to valves
This is an example set-up please refer to the manufactures guidelines for specific details.
20 DN 5 DN
Typical required clearance
Refer to manufacturer for
details.
Figure 38: Typical water valve set-up
1.2
Guidelines for sizing valves and flow rates
Valves should be able to turn on and off rapidly – the combined on/off cycle time for a 50 mm
(2”) valve should be no more than 2 seconds and 19 mm (3/4”) valves should have combined
on/off cycle time of no more than 1 second. This permits precise water addition.
•
Fine valve flow rate
multiplied by on/off cycle time should be in the range 0.04% to
0.1% moisture increase (e.g. for a 1m
3
{35ft
3
} mixer, flow rate x on/off time should be in
the range 1 to 2.4L {0.26 to 0.63Gal} )
• Coarse valve flow rate multiplied by on/off cycle time should be in the range 0.25% to
0.5% moisture increase (e.g. for a 1m
3
{35ft
3
} mixer, flow rate x on/off time should be in
the range 6 to 12L
{1.6 to 3.2Gal}
))
• Valve on/off time if in doubt, set it to one second, then choose valve sizes to give
suitable flow rate according to the chart below