Danfoss 003Z0780 1-1/2" AB-QM Pressure Independent Control Valve 7-33 GPM NPT PICV

The Danfoss 003Z0780 is a 1-1/2" NPT Pressure Independent Control Valve (PICV) from the AB-QM series, designed for precise hydronic flow regulation in commercial HVAC heating and cooling systems. With a flow range of 7 to 33 GPM, this valve combines flow control, automatic balancing, and flow limiting into a single compact unit — eliminating the need for separate balancing valves.

At the heart of the AB-QM design is a built-in differential pressure regulator that automatically compensates for changes in system pressure caused by other valves opening and closing or variable pump speed adjustments. This maintains 100% valve authority at all times, ensuring precise, linear flow control regardless of system pressure fluctuations. The operating differential pressure range is 3 to 60 PSID, with FCI 70-2 Class 4 shut-off.

Key Features:

• 1-1/2" NPT external thread connection with pressure/temperature (P/T) test plugs included
• Flow range: 7–33 GPM; precisely adjustable to the required terminal unit flow
• Built-in differential pressure regulator — no separate DPRV required
• 100% valve authority maintained across full operating range
• Combines control, balancing, and flow-limiting functions in one valve body
• User-adjustable flow setting for maximum flow limitation
• Operating differential pressure: 3–60 PSID
• Maintains linear flow characteristics when paired with a Danfoss proportional actuator
• Compatible with a wide range of Danfoss electric actuators (sold separately)
• Field serviceable design

The AB-QM is ideally suited for air handling units (AHUs), fan coil units, chilled beams, climate ceilings, and other HVAC terminal units. Because valve selection is based on required flow rather than Cv calculations, engineering time and system commissioning effort are significantly reduced. When paired with a compatible Danfoss actuator, the 003Z0780 delivers enhanced energy efficiency and improved indoor climate performance.