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27 November 2008

Recognising the importance of terminal unit control in variable flow water borne HVAC systems, Tour & Andersson has expanded its range of Terminal Balancing Valves (TBVs).

Available with or without modulating controls, Tour & Andersson TBVs allow professional hydronic balancing and efficient operation of small terminal units, and preserve the energy saving achieved by using variable flow systems.

Variable Flow systems are increasingly popular as an energy saving alternative to traditional constant flow water borne heating and cooling systems. The energy savings achieved by the reduction in pump speed in these systems are substantial. However, these savings can be lost if terminal units are not operating at the specified flow. Inefficient terminal unit operation will lead to poor performance in the building environment, particularly in areas furthest away from the pump. The end result of this is poor perception of occupancy conditions by tenants, and increased demand on central pumps and risers as the thermostat is constantly altered, negating any savings achieved by using a variable flow system.

Tour & Andersson’s TBV-CM modulating control valves, allow specifiers to opt for variable flow HVAC systems while still maintaining valve authority and terminal unit performance. By equipping the terminal unit circuits with STAP differential controllers, the differential pressure across the TBV-CM valves can be stabilised, and the correct valve authority can be maintained. This configuration also allows the circuits to operate independently of each other, meaning the system can be expanded or converted without the need for re-balancing.

These valves combine control, balancing, measurement and shut-off in one location, saving installation time and costs associated with multiple valve installation. In addition, by combining these valves with Tour Andersson’s TA CBI balancing instrument, one engineer can balance the entire system unaided, and be sure that the flows are correct and properly documented.

For more information on the hydronic balancing of variable flow HVAC systems, TBV–C and TBV–CM, please visit

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