AB-QM 4.0 Pressure Independent Control Valves (PICV)

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Best-in-class PICV with scaling and clogging resistant design

Danfoss AB-QM was the first of its kind control valve for HVAC heating and cooling applications. AB-QM 4.0 is its next level successor.

The basic principles haven’t changed; It is a control valve with automatic flow limitation and built-in differential pressure controller. The control performance is very accurate and the valve has a – still – unique valve authority of 100%.

But the value the AB-QM 4.0 valves provide has improved a lot. AB-QM 4.0 is the best-in-class PICV currently on the market. The AB-QM 4.0 becomes available in DN 15 up to DN 32. There are versions with and without test plugs. And versions with internal or external thread connections. The flow capacity increases to a broad range of 20 l/h up to 6,000 l/h and can accurately be measured with the PFM 1000 measuring instrument via Bluetooth on iOS and Android devices.

AB-QM 4.0 is engineered to be the indisputable best PICV on the market. For example it has a scaling & clogging resistant design, PN25 Nominal Pressure, accurate flow measuring and bi-directional filling and flushing. These provide many advantages for designers, installers and end-users.

PICV's increase the energy efficiency of HVAC heating and cooling systems. AB-QM 4.0 is designed for terminal units such as fan-coil units, climate ceilings and chilled beams. Equipped with one of our actuators they accurately control the room temperature and improve the indoor climate. In case it's equipped with our digital actuator, NovoCon S, it enables HVAC 4.0 systems for smart buildings with Internet of Things (IoT) solutions.

Features and benefits

Specification & installation

  • BEST-in-class control performance from 10-100% setting
  • NEW visible setting scale with mounted actuator
  • NEW accurate flow measuring
  • NEW higher flow range
  • NEW version with internal thread
  • NEW valve body PN25, DN 15-32
  • NEW bi-directional filling and flushing

Reliability & robustness

  • BEST-in-class reliability and robustness
  • NEW scaling and clogging resistant design
  • Successful lifetime performance tests
  • Extended warranty periods for projects

Connectivity and data (with NovoCon S actuator)

  • Plug & play BMS integration with BACnet or Modbus bus communication
  • Remote commissioning, flow setting, flushing, error detection
  • HVAC data collection
  • Predictive maintenance
  • Optional Active Energy Management, Remote I/O or 4-pipe ChangeOver

Total Cost of Ownership & Return On Investment

  • Lower installation costs
  • Shorter handover phase
  • Lower running costs
  • BEST user comfort
  • BEST HVAC system efficiency
AB-QM 4.0: We created PICVs - now we redefine the value

New: AB-QM 4.0

Get ready for the next level value of your PICV designs.


Type Name Language Valid for Updated Download File type
Data sheet AB-QM 4.0 / AB-QM Pressure Independent Control Valves (PICV) English Multiple 09 Oct, 2019 2.3 MB .pdf
Brochure AB-QM 4.0 Product leaflet English Multiple 11 Jul, 2019 475.8 KB .pdf
Data sheet PFM 1000 Measuring Instrument English Multiple 13 Aug, 2019 228.1 KB .pdf

Related products

  • Actuators for PICVs- Danfoss
    Actuators for PICVs

    To take advantage of the combined balancing and control features of Danfoss AB-QM it has to be equipped with actuators controlled by room thermostats or a Building Management System. Danfoss offers a broad range of actuators varying from thermal on-off to geared digital actuators with bus communication.

  • NovoCon® S Digital Actuator- Danfoss
    NovoCon® Digital actuators

    With NovoCon® Danfoss revolutionizes the way hydronic balancing and HVAC control work together. The first of its kind digital HVAC actuators are directly connected with a Building Management System (BMS). This enables System Integrators to design state-of-art, Internet of Things (IoT) solutions.

Danfoss HVAC 4.0 solutions for smart buildings

This is where the HVAC transformation starts

Find out more about our smart, Building Management System (BMS) connected, HVAC solutions here:


The standard product warranty on AB-QM 4.0 is 2 years. For projects we can agree on an extended warranty period for a full peace of mind. Contact a Danfoss sales representative to find out more.


  • NEW: AB-QM 4.0 Pressure Independent balancing and Control Valve (PICV) for smart buildings
    Friday, October 11, 2019

    Danfoss AB-QM 4.0 replaces AB-QM Pressure Independent balancing and Control Valves (PICVs)