How do PICVs work?
Pressure Independent Control Valves (PICVs) are designed to maintain
a constant and accurate flow rate regardless of pressure variations within the system.
By automatically compensating for fluctuating differential pressure, PICVs ensure stable control
at terminal units, improving system balance and overall operating efficiency.
This operating principle makes PICVs a reliable solution for modern hydronic and HVAC systems,
where variable loads and changing operating conditions are the norm rather than the exception.
The right PICV
for each application
Selecting the correct PICV depends on system layout, operating conditions, and application requirements.
Our Definitive Guide to PICVs is designed to support designers and system engineers in making informed choices, providing practical criteria, application examples, and technical guidance across different hydronic and HVAC scenarios.
A clear, practical reference to help ensure stable performance and correct valve selection from the early design stages.
Pettinaroli PICVs
Designed to meet the needs of modern hydronic systems
With over fifteen years of experience and more than one million PICVs installed worldwide, Pettinaroli has developed a complete range
of Pressure Independent Control Valves designed to address a wide variety of hydronic system requirements.
The range includes PICVs with linear and equal percentage flow characteristics,
available in axial and rotary designs, allowing designers to select the most suitable solution for each application.
Dynasty 92 Series
Compact design with dirt-resistant diaphragm
The Dynasty range of PICVs is engineered to operate reliably even in systems with heavily contaminated water.
Featuring a linear flow characteristic, the valve allows internal components to be removed, cleaned, and replaced
without compromising overall performance, supporting long-term stability and ease of maintenance.
Technical information
1/2”F
2”F
2”F
Connections
3,63 / 5,80
0,25 / 0,40
0,25 / 0,40
Start-up max psi & bar
150 / 14.000
0,66 / 61,70
0,66 / 61,70
Flow rate l/h & GPM
-10°C
120°C
120°C
Temperature
2.500kPa
25bar
25bar
Working pressure max.
Applications
The Dynasty range of PICVs is designed to provide accurate flow limitation and temperature control in heating and chilled water systems serving terminal units.
The 92 Series valve offers reliable control for water-to-water heat exchangers and is particularly suitable for use in Heat Interface Units (HIUs), where water quality can be difficult to maintain due to limited accessibility.
The Dynasty 92 Series can also be integrated into valve assemblies for connection to Fan Coil Units, supporting flexible system configurations.
Features & Benefits
- Compact, space-saving design
- Serviceable internals for easy maintenance
- Dirt-resistant diaphragm
- Linear flow characteristic
- Low start-up differential pressure
- Thermal and electromechanical actuator compatibility
EvoPICV 91 Series
Combined flow control and temperature regulation
EvoPICV combines constant flow limitation with full-stroke, full-authority equal percentage temperature control in a single valve.
It is suitable for use in both variable and constant temperature systems and can operate as a constant flow limiter
in constant volume systems (without an actuator) or as a true PICV in variable volume systems.
Applications
The control valve features an intrinsic equal percentage characteristic, making it suitable for water-to-air terminal units
such as fan coil units, chilled beams, and air handling units.
The valve can be serviced using a dedicated tool and, thanks to its unidirectional design, can be installed on either the flow or return pipework,
offering greater flexibility during system design and installation.
Features & Benefits
- Equal percentage flow characteristic
- Suitable for variable and constant temperature systems
- Combined flow limitation and temperature control
- Thermal and electromechanical actuator compatibility
