Belimo B311B Valve

The Belimo B311B is a 1/2 inch NPT 3-way characterized control valve engineered for precision in hydronic systems. With a flow coefficient of 1.9 Cv, this valve features an A-port equal percentage flow characteristic and a modified B-port for constant common port flow, ensuring stable heat transfer even during part-load conditions. Constructed with a nickel-plated forged brass body and a chrome-plated brass ball, it is rated for chilled or hot water applications up to 250°F and handles glycol solutions up to 60% without performance loss. The TEFZEL characterized disc stabilizes pressure drops and prevents "hunting" in control loops, making it a reliable choice for HVAC zone control and AHU coil management. Designed for zero-percent leakage through the A-port, the B311B mixing or diverting valve integrates seamlessly with LRB, ARB, and NRB series actuators to maintain tight control over flow rates in demanding commercial environments.

• Precise Flow Control: The equal percentage flow characteristic in the A-port provides linear heat transfer for improved energy efficiency.
• High Temperature Rating: Built for durability in chilled and hot water systems with a maximum fluid temperature of 250°F.
• Tight Seal Integrity: Features a bubble-tight shut-off at 0% leakage, preventing unwanted energy loss through the coil.
• Chemical Resistance: Rated for up to 60% glycol concentration, ideal for systems requiring freeze protection or industrial inhibitors.
• Robust Build: The nickel-plated brass stem and chrome-plated ball resist scale buildup and mineral deposits.

Can this valve be used for both mixing and diverting applications?
Yes, the Belimo B311B is designed to function effectively in both mixing and diverting configurations within a closed hydronic loop.

What actuators are compatible with the B311B?
This 1.9 Cv ball valve is compatible with Belimo LRB24, ARB, and NRB series actuators, providing flexibility for fail-safe or non-fail-safe sequence of operations.

Does the port configuration affect the flow rate?
The A-port provides characterized flow for precise modulation, while the B-port is modified to ensure the common port maintains consistent flow, preventing pressure surges in the system.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.