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Pressure Independent Control Valves (PICV)

What is a PICV?

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 good PICV will offer 100% authority no matter the design flow it is set to and regulate with a full control span from 0(2)-10V control signal dependent on actual load requirements. Control mode is traditionally made with a linear control signal, but designs are at present time frequently made with equal percent signal – clearly FlowCon offers both. Also, it is essential that the balancing valve function is adjustable, dynamic and pressure independent which is the essence of FlowCon’s business since decades.

FlowCon’s PICV range include three different types which are all tested to BSRIA PICV standards. They are an easy solution to consultants, mechanical- and electrical contractors and end-users - due to the flexible complete solution, user-friendly setting, easy commissioning and low minimum ΔP.

FlowCon’s range of PICVs includes:

FlowCon Green
FlowCon GreEQ
FlowCon SM
FlowCon UniQ®

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Why choose a PICV?

A PICV is a 3-in-1 solution combining a control valve, a balancing valve and a differential pressure control valve. When choosing a true PICV with full authority, optimal control and regulation resulting in ideal room temperature and proper heat distribution at lowest possible energy consumption are achieved always.

 

How does a PICV works?

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.

Some FlowCon PICV Projects

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