DANFOSS ABQM PRESSURE INDEPENDENT CONTROL VALVES

The AB-QM has a linear control characteristic.

The AB-QM is pressure independent which means that the control characteristic is independent from the available pressure and is not influenced by a low authority.

The flow limitation on the AB-QM is achieved by limiting the stroke and the Danfoss actuators calibrate to the stroke of the valves. This means that the AB-QM keeps its linear characteristic independent of the setting or differential pressure.

Because of the predictable characteristic the actuators on the AB-QM can be used to change the response from linear to logarithmic (equal percentage).

That makes the AB-QM suitable for all applications, including AHUs, where the equal percentage characteristic is needed to get a stable control loop.

The actuators can be switched from linear to logarithmic by changing a dipswitch setting on the actuator.