Belimo B339 Ball Valve

The Belimo B339 is a high-performance 1 1/2" NPT 3-way characterized control valve engineered for precise modulation in hydronic systems. Featuring a 29 Cv rating, this valve utilizes an A-port with equal percentage flow characteristics and a B-port modified for constant common port flow, ensuring stable control loop performance. Constructed with a nickel-plated forged brass body and a stainless steel ball and stem, the B339 is built to withstand chilled or hot water applications up to 250°F and is compatible with up to 60% glycol solutions. This model serves as the direct updated version for the B339B, offering seamless integration with Belimo LR, AR, and AK series actuators. Designed for high-close-off pressure requirements, the stainless steel trim prevents premature wear and reduces torque requirements over the life of the valve, making it a reliable choice for commercial HVAC mixing and diverting applications.

• Precise Flow Control: The specialized A-port design provides equal percentage flow, preventing hunting in the control loop.
• Durable Construction: Stainless steel ball and stem provide superior resistance to corrosion and scaling compared to chrome-plated alternatives.
• Retrofit Compatibility: Direct replacement for the legacy B339B, utilizing standard NPT piping and existing Belimo actuator linkages.
• High Temperature Tolerance: Rated for fluids up to 250°F, suitable for aggressive hydronic heating and cooling cycles.
• Low Maintenance: Self-cleaning ball design reduces the risk of clogging from pipe debris and sediment.

What is the difference between the B339 and the discontinued B339B?
The B339 is the current production standard, offering the same 29 Cv and 1 1/2" NPT dimensions, ensuring full backward compatibility with existing piping and actuators.

Can this valve be used for steam applications?
No, the B339 is specifically rated for chilled or hot water and glycol solutions. For steam, a specialized high-pressure steam valve is required.

Which actuators are compatible with the B339?
This 1 1/2" valve typically pairs with Belimo non-spring return (LRB, ARB) or spring return (AFRB, LFRB) actuators depending on the required torque and fail-safe requirements.

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.