Armstrong CBV-2T-570109-345-2 Circuit Balancing Valve

Armstrong CBV-2T-570109-345-2 Circuit Balancing Valve is a bronze-bodied, 2-inch NPT-threaded device used to precisely balance hydronic circuits within HVAC systems. Part of Armstrong Fluid Technology’s CBV family, this venturi-style valve features multi-turn adjustment with hidden memory stops to lock in the desired balance point, enabling consistent flow across multiple zones. The 2-inch nominal model (CBV-2) carries part number 570109-345 and is designed for threaded connections for straightforward integration into standard piping. For the 2-inch variant, verified data include a flow range of approximately 15.5 to 81.92 gpm, a pressure rating up to 300 psi, and a operating temperature range from -4 to 300 °F, making it suitable for both heating and cooling water systems. The valve’s venturi flow element provides precise flow metering and support for upstream differential-pressure signaling, helping engineers meet design intent with stable ΔP across circuits. Typical applications include balancing loops in central plants, radiant heating systems, and individual fan-coil or air-handling unit circuits within hydronic networks, where accurate circuit-by-circuit adjustment is essential for energy-efficient performance. Armstrong emphasizes the CBV line’s emphasis on precise, repeatable control through incremental adjustments, not fixed-orifice limitations, which supports reliable zone balance and predictable system performance.