AB-QM 4.0 Pressure Independent Control Valves (PICV) Size S DN15 - DN32

Top-class PICV for hydronic HVAC balancing and control

Danfoss AB-QM was the first of its kind pressure independent 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 close to 100%.

But the value the AB-QM 4.0 valves provide has improved a lot. AB-QM 4.0 is the most advanced PICV currently on the market. The AB-QM 4.0 is 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 covers a broad range of 20 l/h up to 5,000 l/h and can accurately be measured with the PFM 1000 measuring instrument via Bluetooth on iOS and Android devices.

AB-QM 4.0 Product range

The AB-QM 4.0 portfolio offers a wide range of options for all hydronic HVAC applications such as Fan Coil Units, Chilled beams and radiant panels. Here is a quick glance into the many options:

• DN 15 in Low Flow, Normal Flow and High Flow for design flows from 20- 1,200 l/h, with or without test plugs, with internal or external thread
• DN 20, in Low Flow, Normal Flow and High Flow for design flows from 110 – 1,900 l/h, with or without test plugs, with internal or external thread
• DN 25, in Normal Flow and High Flow for design flows from 230 – 3,800 l/h, with test plugs, with internal or external thread
• DN 32, in normal Flow and High Flow for design flows from 360 – 5,000 l/h, with test plugs, with internal or external thread

For every DN size valve there is also an optional to use insulation scale to minimize heat losses from the valves and simplify overall insulation of the heating system.

AB-QM 4.0 Flexo solution for Fan Coil Units

Increase flexibility and save time during installation, commissioning and servicing of two-or four-pipe connected Fan Coil Units (FCUs) with AB-QM 4.0 Flexo. It's a pre-assembled and pressure tested connection set, designed for increased installation flexibility and prefab projects. The set consists of an AB-QM 4.0, two 3-way ball-valves, a strainer, a drain valve and three test plug connections for pressure- or flow measurements. With these the set provides an 8-in-1 solution for hydronic balancing, control, measuring, installation, flushing, filling, draining and servicing of the Fan Coil Units they are installed on.

AB-QM 4.0 Flexo is available in two versions, left-hand and right-hand, and two dimensions; DN15 and DN20. Sets in DN15 contain an AB-QM 4.0 PICV valve with Low Flow, Normal Flow or High Flow, covering design flows from 20 – 1,200 l/h. The DN20 sets come with a Normal Flow or High Flow AB-QM 4.0 valve and cover design flows from 110-1,900 l/h.

For both DN15 and DN20 sets matching flexible, stainless steel, pipes are available. For the left-hand version there is also an EPP insulation cover.

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AB-QM 4.0 CO6 Flexo solution for Radiant Panels

The Danfoss AB-QM 4.0 CO6 Flexo standardized prefab connection set is an innovative solution to make the design, installation, and service on radiant panels or chilled beams in four-pipe heating and cooling change-over systems easier, faster, and more reliable. With a built-in height of just 125 mm, the set will match all requirements. The special ‘click-fit’ connections ensure watertight connections and provide maximum installation flexibility. They also allow fast and easy disassembly and replacement of the AB-QM 4.0 or ChangeOver6 valves. Each individual set is pressure tested after it is assembled.