Danfoss ab-qm 4.0 balancing and control valve dn20 hf with inside thread

Danfoss AB-QM 4.0 flow limiter DN20 HF with internal thread Product description: Danfoss AB-QM is a pressure-independent control valve (PICV) that combines high accuracy with market-leading user-friendliness. The design of AB-QM is fully geared to ensure that your projects meet the schedule and budget while providing the most efficient HVAC system. Pressure-independent valves are control valves that have an automatic adjustment function. A built-in pressure regulator maintains a constant differential pressure across the control valve, ensuring full authority and automatic flow limitation. By combining two functions into one, regulation and automatic water balance, Danfoss PICVs offer a cost-effective solution to the challenges faced by forward-thinking designers of HVAC systems.