Expanded and improved balancing and control valves

Danfoss is expanding the product range of its pressure independent AB-QM balancing and control valves for heating and cooling systems. The new Danfoss AB-QM 4.0 valves are designed in sizes from DN15 to 32 and add new features and improved specifications to the AB-QM series. The unique 100 per cent valve authority, achieved by a built-in differential pressure controller, remains unchanged. This ensures the accurate control performance of the valves. Several significant changes and improvements have been implemented, making it a whole new valve rather than an upgrade.
By using innovative PPSU Polymer material the resistance of the valve to scaling and clogging has been considerably improved compared to any other HVAC control valve. And it features a pre-setting scale that remains visible from several directions, even with an actuator mounted on the valve.
Intensive testing proofs continued stability of the flow characteristics and accurate control performance, also after years of use. The pressure class has been increased from PN16 to PN25.
The adjustable flow rate of the AB-QM 4.0 valves has been significantly increased, for example from maximum 450 to 600 l/h with DN15, allowing bigger terminal unit capacities to be controlled by smaller dimension valves. The minimum flow pre-setting has been reduced from 20 per cent previously, to just 10 per cent of the design flow now.
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