Belimo B317 Valve

The Belimo B317 is a high-performance 3-way characterized control valve designed for precision modulation in HVAC systems. Featuring a 3/4 inch NPT connection and a 4.7 Cv rating, this valve utilizes a nickel-plated forged brass body paired with a 316 stainless steel ball and stem to ensure long-term reliability in demanding hydronic loops. The A-port is engineered with a specialized disc to provide an equal percentage flow characteristic, while the B-port is modified to maintain a constant common port flow, making it ideal for bypassing applications in chilled or hot water systems. Rated for temperatures up to 250°F and compatible with up to 60% glycol solutions, the B317 minimizes hydronic pressure drops and prevents actuator hunting. This mixing or diverting valve is essential for contractors requiring leakage rate zero (ANSI Class VI) performance and seamless integration with LR or AR series actuators.

Key Benefits for Technicians

• Corrosion Resistance: The 316 stainless steel ball and stem prevent pitting and scaling in aggressive water conditions.
• System Stability: Optimized flow characteristics eliminate thermal shock and improve delta T management across coils.
• Reduced Blow-off Risk: High close-off pressure ratings allow for reliable operation in high-rise and high-head pressure applications.
• Maintenance-Free Design: Double EPDM O-rings and a fiberglass-reinforced Teflon seat ensure a bubble-tight shutoff without the need for periodic packing adjustments.

Common Questions

What is the maximum static pressure for the B317?
The Belimo B317 is designed to handle a maximum body pressure of 600 psi (WOG), though actual operating close-off pressure depends on the specific actuator torque rating selected.

Can this valve be used for steam applications?
No, this model is specifically engineered for chilled and hot water applications. For steam requirements, a different valve series with high-temperature packing should be specified.

Which actuators are compatible with the B317 CCV?
This 3/4" 4.7 Cv valve is natively compatible with Belimo LR, AR, and KR series actuators, allowing for flexible control signal integration including 2-10VDC or floating point.

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.