Danfoss AB-QM Balancing Valve

The AB-QM Valves are Flow Limiting Valves used on Heating Systems in order to provide efficient control of the flow and temperature. By controlling the flow to the pre-set scale, a low pressure differential is then kept by the internal diaphragm. This ensures that the flow does not exceed the set point and prevents overflow by the pumps. By keeping the flow at a constant efficient rate, the temperature provided to a room will not exceed dramatic tolerances and keep heating bills at a viable level. All of this creates cost savings on the installation and a more efficient system for both the installer and end user.

The AB-QMs are available in connection sizes  from  40-50mm with a union connection style and then 65-250mm are all supplied with a PN16 Flanged connection. Each size of AB-QM has predetermined flow ranges that the valves can be set to which is also part of sizing up what Valve to use, not just matching your pipework size.

The AB-QM can be upgraded to work as a Pressure Independent Control Valve, or PICV for short, by adding an actuator. Danfoss offer four different types of actuators to suit the AB-QM range, varying in their operation between On/Off, 0-10 Volt, 4-20ma or floating point and the choice between these will depend on the control strategy.  By adding the actuator the AB-QM becomes a full authority valve that can be used to control heating and cooling circuits for Air Handling and Fan Coil Units. Hydronic balance is maintained without allowing overflow as the AB-QM will control the flow. This functionality would normally be controlled by two separate valves so by incorporating it into one device, a further cost saving is made along with the efficiency obtained.