127156Afc 8G0 - Flowcal 3/4" Press W/Check Low Lead 8 Gpm - Caleffi

Genuine Caleffi FlowCal™ automatic, pressure-independent flow balancing valve. The FlowCal™ eliminates the need for manual hydraulic balancing by automatically maintaining a fixed, precise flow rate (in GPM) regardless of pressure fluctuations in the system. As zone valves open and close and system pressure shifts, the internal spring-loaded piston and machined orifice cartridge adjust automatically — delivering exactly the specified flow every time.

🔌 Connection Type

Press — tool-free press-fit connection for copper or stainless press fittings

⚠ Installation Note

Verify the rated GPM on the valve matches the design flow for the circuit before installation. The FlowCal™ maintains its rated flow automatically — do not attempt to adjust the cartridge.

Q: What is a pressure-independent balancing valve?

A: A pressure-independent balancing valve (PIBV) maintains a constant, preset flow rate regardless of changes in differential pressure across the valve. Traditional manual balancing valves must be re-adjusted whenever system conditions change. The FlowCal™ uses an internal cartridge to automatically compensate, making system balancing a one-time installation task rather than an ongoing maintenance activity.

Q: What is the difference between the standard FlowCal and FlowCal+ (128 Series)?

A: The standard FlowCal (121/127 series) is used for hydronic heating and cooling circuit balancing. The FlowCal+ (128 series) is designed specifically for domestic hot water recirculation systems — it includes a built-in check valve and optional temperature gauge to balance temperature drops across pipe risers.