Benefits of PICV’s
For ModuSat Heat Interface Units
Good Differential Pressure Control
Good differential pressure control is required to ensure that control valves within heat interface units
feature good valve authority and function correctly. This minimises excessive fluctuations within system
pipework and reduces excessive flow and pressure acting against control valves to improve
performance, operation and valve lifespan. Differential pressure control is generally installed either
within the heat interface unit, locally or on each lateral or within each riser, depending on the number of
units to be served and ensuring multiple valves are not installed in series.
However, there can be issues and complications when installing DPCV’s within risers
and laterals:•
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Potential limits in ability to provide close control of differential pressure at low flow rates due to
operational range.
Requires separate commissioning in addition to the heat interface unit set-up.
Additional design works required for accurate sizing – adding cost to the project.
Re-balancing of differential pressure control valves will be required for phased occupancy where development handover is done in stages.
To simplify the design, installation and commissioing procedures our ModuSat range of heat interface units,
for communal heating systems, feature Pressure Independent Control Valves (PICV’s) as standard.
PICV technology was introduced in the USA during the early nineties and is now a proven technology. This
type of control eliminates the requirement for 3 separate valves for the regulation of differential pressure,
flow and heat energy as these functions are combined within a single unit.
The 3 key components of the Evinox PICV (Pressure Independent Control Valves) are:-
Flow regulation / setting
Differential pressure control
Energy flow control
The key benefits of a PICV valve are:•
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Flow and pipework design are only considerations for the design team as the differential pressure is controlled locally by the unit and system requires no additional pressure control valves.
It aids primary system balancing and is a set and forget unit as no additional adjustments are required once the heat interface unit is initially commissioned.
System can easily be adapted or modified to include additional heat interface units, if required, with no PICV adjustment.
Minimises system pressure fluctuations and ensures efficient operation of the ModuSat unit by close control of the heat energy required.
The PICV also reduces overall equipment costs and the time required to carry out system commissioning.
Evinox Ltd T. +44 (0)1372 722277
2551460A
E. [email protected]
W. www.evinox.co.uk
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