Belimo B348 Valve

The Belimo B348 is a heavy-duty 2-inch 3-way charactering control valve designed for precise fluid control in high-demand hydronic systems. Featuring a 37 Cv rating and female NPT threaded connections, this valve utilizes a forged brass nickel-plated body combined with a 316 stainless steel ball and stem to resist corrosion and scaling. The A-port is engineered with a specialized disc to provide equal percentage flow characteristics, while the B-port is modified for constant common port flow, ensuring stable mixing or diverting performance. This mixing valve is rated for chilled or hot water applications with temperatures reaching up to 250°F and is compatible with up to 60% glycol solutions. It is commonly paired with Belimo rotary actuators for seamless integration into HVAC building automation systems. The stainless steel trim ensures long-term reliability in closed-loop hydronic circuits by preventing premature leaks and seat wear during high-velocity cycles.

Key Benefits for Contractors

• Corrosion Resistance: The 316 stainless steel ball and stem prevent pitting and seizing in aggressive fluid environments.
• Precise Flow Control: The equal percentage flow characteristic in the A-port prevents hunting and improves heat exchanger efficiency.
• Versatile Media Handling: Optimized for fluids ranging from chilled water to high-temp hydronics with high glycol concentration.
• Leak Reduction: Blow-out proof stem design and dual EPDM O-rings provide a high close-off pressure rating and zero percent leakage through the A-port.

Common Questions

Can the Belimo B348 be used in steam applications?
No, this specific model is rated for water and glycol solutions up to 250°F; it is not designed for saturated steam service.

What is the difference between the A-port and B-port flow?
The A-port provides an equal percentage flow curve for precise control, while the B-Port is modified to maintain a constant bypass flow, ensuring system stability in mixing configurations.

Which actuators are compatible with this 2-inch valve?
The B348 is compatible with Belimo ARB, GRB, and AF series actuators, depending on the torque and fail-safe requirements of your sequence of operations.

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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.