Xterminator Manual Balancing
An Xterminator with a manual balancing valve provides a cost-effective solution for a wide range of projects. Manual balancing valves can be used on terminal units fitted with either 2 port or 4 port temperature control valves.
Available in diameters from ½” to 2”, the Xterminator can be designed either for mounting within pipework runs or close coupled to the terminal unit As standard, Xterminator units consist of a flushing bypass, a flow isolation valve and a commissioning valve in the return.
Also incorporated as standard are a drain cock in the flow and a test point to enable the differential pressure across the coil to be measured. As an option the flow isolation valve can be replaced with a Filterball combined strainer and isolation valve.
Xterminator can be assembled with a mounting or hanging bracket or pre-insulated using a moulded insulation box.
Terminator Commissioning Valves
The Terminator Commissioning Valve (TCV) is a combined venturi measuring device and regulating ball valve.
Each valve size comes with an option to change the venturi depending on the flow and design approach.
The ½” TCV is suitable for most typical flow rates found in fan coil units including those that would be commonly sized at ¾”. By utilising a profiled ball the ½” TCV offers greatly improved regulation characteristics compared to a full bore ball valve.
Sizing of commissioning valves is usually carried out to provide differential pressure readings between 1 and 4.6 kPa on a fluorocarbon manometer, although the venturi can also be used to introduce a significant amount of resistance if required into the system design.
Low Flow Commissioning
One of the problems often encountered when very low flow rates are specified is dirt collecting in the commissioning valve due to the very small area of passage required to regulate such a low flow.
In a traditional globe type double regulating valve this area of passage is formed as an annulus between the globe and valve seat, this annulus can only allow very small particles of dirt to pass often causing valve blockage and system performance to be reduced.
By using a profiled ball all of the area of passage is combined into a short slot which will allow larger particles of dirt to pass through the valve without clogging.
