Pressure Independent Control Valves: A unique approach to a Hydronic System

Date: May 12th, 2020

It's always good when a product is capable of doing two jobs instead of one. Not only do multi-function products save costs in material, but they often can save installation time and more. Pressure Independent Control Valves (PICV) provide multiple functions to a Hydronic System in two different ways; by controlling flow in proportion to the load as well as limiting the maximum flow allowed in a circuit.


Hydronic systems must be balanced in order to maintain system efficiency and to deliver the desired comfort level in a given space. Terminal devices and other system components cannot deliver their optimal performance if the flow is not regulated properly.  The result of poor flow control is lower efficiency of your system as well as comfort related challenges for occupants.  In order to manage the flow requirements, automatic temperature control valves (ATC), manual balancing, or automatic balancing valves are placed throughout the system. Yet some of these valves are required to be balanced during installation and then again as the system may change with different load requirements.


Pressure Independent Control Valves combine the functionality of the ATC  and an automatic balancing valve all into one nice package. PICV’s are capable of adjusting to changes in pressure while maintaining the correct flow for the designed system at multiple load requirements. PICV’s also reduce the requirement for labor intensive balancing since they are pressure independent and automatic.  Since PICV’s combine multiple functions into one valve, the time involved in installation is also substantially reduced. 

Nexus currently offers two PICV's with a size range from ½" thru 10". The Dynamic ND is available from ½" thru 2" and the Vivax is available from 2 ½" thru 10".

Dynamic™ ND
Sizes: ½" thru 2"

A combination independent flow control valve (PICV) with adjustable flow setter, integrated measuring venturi, and differential pressure regulator.  The ND comes standard with two pressure and temperature test plugs, and a universal actuator mounting collar.

 

 

 

Vivax™ VIVF

Sizes: 2½" thru 10"

The 2 ½” – 10” Vivax™ PICV 3-in-1 design makes it easy to size and select, eliminate overflow, and provide 100% control valve authority. The precise control function and instant flow rate setting results in optimal end-user comfort and reduces energy consumption. The Smart-IS actuator provides easy digital programming when setting the range of flow and has the ability to display the actual flow for flow verification and testing. The Vivax™ VIVF comes standard with two pressure and pressure test plugs with flanged mating connections.