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Green3 Series
Pressure Independent Control Valves or Pressure Independent Balancing and Control Valves – also commonly known as PICVs (or PIBCVs) – are getting more and more popular in both 2- and 4-pipe heating and cooling applications due to their accurate flow control at any load condition.
A PICV includes three valves in one body by combining the control function, the balancing function and differential pressure control function in one unit.
• Control
The control function of the PICV, as with any other 2-port control valve, allows load dependent flow variations from selected design flow (100% load) and down to closed valve (0% load). By varying the flow rate, the heat output of the terminal unit is controlled and will provide optimal room comfort. The key to the optimal solution is to choose a true PICV with 100% authority using full stroke or multiple rotations when regulating to reduced flow rates.
• Balancing
The key to the optimal solution is to choose a real dynamic balancing valve including a rolling diaphragm which at any time will self-balance to the required flow independent on system pressure changes. The balancing function shall be easily adjustable to several max. flow settings (minimum 41 different) in the same PICV.
• ΔP control
With changing load requirements in the system, system pressure will also var. This calls for an automatic balancing solution which instantaneously compensates for the pressure changes by adjusting the flow outlet with the rolling diaphragm as described above under balancing.
Application
The FlowCon Green.3 is designed to facilitate large fan coils, smaller air handling units, smaller heat exchangers or equivalent. In general, it is the optimal choice in any applications where efficient distribution of water - with focus on system pressure drop - is required. In addition, will FlowCon Green.3’s low pressure drop and feedback option will make the valve ideal for Green Building projects.
Application Example
Plate Heat Exchanger with Pressure Independent Control (PICV) - Modulating Control.
100% Authority - Pressure Independent Control Valve
The FlowCon Green.3 valve is a pressure independent dynamic control valve which meets today’s HVAC requirements of reducing building running costs without increasing initial installation costs. The FlowCon Green.3 is an essential partner in the strive for reducing operational cost, energy consumption and CO2 emission.
The valve includes an innovative self-adjustment feature allowing continuous mechanical self-balancing in all valve positions. Next to this, the valve is constructed in such a way that the valve stroke is unaltered regardless which of multiple design flow settings is selected. This ensures that each thermal unit controlled by a Green.3 valve is always supplied with the exact flow required for the specific system condition.
The FlowCon Green.3 valve is a true pressure independent control valve which always holds 100% authority. As long as the pressure differential across the valve is within the operating range, the Kv (Cv) of the valve is changing and continuously regulated to maintain required flow. Any flow below design flow is controlled with full authority via the MS through the valve actuator.
Benefits/Features
- Compact one-unit PICV, including modulating control valve, dynamic flow limiter and differential pressure control valve in one body.
- 100% authority pressure independent – for any of the valve’s pre-defined 41 max. flow settings.
- Full stroke modulation at any flow setting – for full control providing accurate flow also at reduced load.
- Easy setting and Field adjustable – flow setting is stepless and can easily be set to any design flow in the flow range. Setting can be done before or after installation and flow may be changed on demand without removing the valve from the installation.
- “Sealed” setting - actuator will cover the setting and protect against tampering.
- Standard or failsafe actuator; always incl. feedback signal - an easy solution for designers, installers, and end-users.
Literature
You can download the informational brochures or the user manuals for our products
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