Taco ACUF-400-AF-3 - Accu-Flo Balancing Valve - 4" Flange

The Taco Accu-Flo Flanged Balancing Valve is designed for larger hydronic systems that demand high flow capacity with precise control. With a cast iron body, TFE internals, and Class 125 flanges, it brings durability and flow measurement performance to commercial applications like chillers, boilers, and district systems.

Its modified Venturi section allows for dependable flow readings even at low rates, and installation is straightforward thanks to the integrated Schrader pressure port. From commissioning to long-term performance, the Accu-Flo is engineered to reduce pressure drop and improve system efficiency.

Features

Flanged cast iron body for large-diameter piping systems
Fixed-port Venturi design—superior flow accuracy, no flow charts needed
Flow measurement unaffected by stem or ball position
Schrader pressure port for dual-readout gauge attachment
Class 125 rating (2½" to 4" sizes)
Positive shut-off capability for easy maintenance
Tamper-resistant memory stop and calibrated nameplate
Internal components rated to 250°F
Cv range: 122 to 444, depending on size
Available in 2½", 3", and 4" sizes

Applications

Large hydronic heating and cooling systems
Chillers, boilers, and large air handlers
Balancing in central plant or high-load zones
Commercial commissioning and energy optimization work

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Collection: Balancing Valves

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ACUF-400-AF-3 - Accu-Flo Balancing Valve - 4" Flange