Belimo B318 Valve

The Belimo B318 is a high-performance 3/4 inch 3-way characterized control valve engineered for precise modulation in hydronic systems. Featuring a 7.4 Cv rating, this NPT ball valve utilizes a specialized A-port with an equal percentage flow characteristic and a modified B-port to ensure constant common port flow. The construction consists of a nickel-plated forged brass body paired with a stainless steel ball and stem, providing superior durability against corrosion and scale buildup. Designed for versatility, the Belimo B318 handles chilled or hot water applications with temperatures reaching up to 250°F and is compatible with up to 60% glycol solutions. This mixing or diverting valve is ideal for HVAC zone control and AHU applications where tight shut-off and accurate flow regulation are critical for system efficiency. Its blowout-proof stem design and double O-ring interface ensure long-term reliability in demanding hydronic heating and cooling systems.

Key Benefits

• Precision Flow Control: Equal percentage characteristic ensures linear heat output from coils, preventing hunting and improving stability.
• Robust Metallurgy: Stainless steel trim prevents premature wear and ensures reliable operation in variable water chemistry.
• High Temperature Tolerance: Rated for up to 250°F, making it suitable for high-temperature hot water and low-pressure steam applications.
• Versatile Media Handling: Certified for use with high concentrations of glycol solutions without degrading internal seals.
• Low Torque Requirements: Optimized for use with Belimo LR, AR, and NR series actuators, reducing power consumption and wear.

Common Questions

What is the maximum close-off pressure for the Belimo B318?
The B318 valve features a close-off pressure rating of 200 psi, ensuring positive shut-off and preventing leakage in high-head pressure systems.

Can this valve be used for both mixing and diverting applications?
Yes, the Belimo B318 is designed as a universal 3-way valve, though flow direction must follow the arrows indicated on the valve body for equal percentage flow accuracy.

Is the B318 compatible with steam?
While the B318 is rated for 250°F water, it is not recommended for high-pressure steam; it is specifically optimized for chilled and hot water hydronic loops.

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.