The Auto Touch Independent (ATi) valve is a state-ofthe-art control valve combining a high quality/high rangeability temperature control valve with a dynamically balanced flow regulator in the same space-saving housing. The result is a pressure independent control valve that maintains the desired flow rate irrespective of pressure differential changes across the valve within the differential pressure range.
Even the most controllable standard (pressure dependent) temperature control valve will allow a change in flow as the differential pressure in the system changes, which is an everyday occurrence. Any time a chilled water or hot water system is operating at less than design maximum load conditions – which is most of the time – differential pressures in the system tend to increase, resulting in overflow through the control valves. This overflow condition results in control instability, and higher pumping costs. Balancing valves, either manual or automatic, can only prevent overflow at conditions above design maximum flow. At any flow condition less than design maximum, balancing valves do not fulfill any purpose.
The ATi valve provides a cost effective means of controlling hot water and chilled water flow in an accurate and stable manner while minimizing pumping, heating and cooling costs. And by combining the automatic temperature control function and the dynamic balancing function in a single device, installation costs are also reduced.
ATi valves are also available with an optional strainer/drain with isolation valve to provide a complete and convenient solution for controlling and maintaining the coil.