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APPLICATION
Honeywell pressure independent control valve (PICV) is
used in heating and cooling systems in applications
with Air Handling Units, Fan Coil Units, chilled ceilings,
zone control, or other terminal unit applications.
Honeywell VPI series provides modulating control with
full authority regardless of any fluctuations in the
differential pressure of the system. Honeywell VPI
series combines an externally adjustable automatic
balancing valve, a differential pressure control valve,
and a full authority modulating control valve.
Honeywell VPI series makes it simple to achieve 100%
control of the water flow in the building while creating
high comfort and energy savings at the same time. An
additional benefit is that no balancing is required if
further stages are added to the system, or if the
dimensioned capacity is changed. Energy-saving due
to optimal control, lower flow, and pump pressure.
Maximized ΔT due to faster response and increased
system stability
Application Notes
Valve sizing is important for correct system operation.
Undersized valves do not have sufficient capacity at
maximum load.
Proper Use
These valves are intended for use in chilled water and
hot water closed-loop applications only, with a media
temperature range of -20ºC to +120ºC (-4ºF to
+248ºF), and static pressures up to 580psi. Not
suitable for oil, combustible gases, or high-
temperature steam.
These valves are to be operated with the appropriate
and compatible Honeywell actuators only. Refer VPI
series PICV Product Datasheets for more details on
valve and actuators compatibility.
Water should be properly filtered, treated, and
conditioned for good operating performance, and
according to according to VDI 2035 with up to 50 %
Glycol (oxygen concentration less than 0.2 g/m3, pH
8...9.5; Fe<0.5 mg/kg; Cu<0.1 mg/kg). The installation
of strainers and filters is recommended. Do not use
manual balancing valves.
IMPORTANT: The presence of excessive iron oxide
(red rust) in the system voids the valve warranty.
Effective Flow Rate
The built-in differential pressure regulator makes fluid
flow through the valve independent of changes in
supply. The pressure regulator virtually eliminates
cavitation in the valve and decouples the control valve
from the effects of piping components such as
reducers and elbows.
Pressure independent control valves are sized to match
design coil flow regardless of coil connection size.
These valves eliminate the need to balance the system
for proper flow and allow chillers to be operated at
design temperature differential for maximum
efficiency at every load condition.
Flow Characteristic
The VPI series Pressure Independent Control Valves
have: Linear flow characteristic and can be converted
to an equal percentage in the actuator.
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