Description
The Belimo B318B is a high-performance 3-way ball valve engineered for precise flow control in commercial HVAC hydronic systems. Designed for both chilled and hot water applications, this valve delivers reliable, long-service-life performance in demanding building automation and hydronic piping environments.
Flow Characteristics
- A-port: Equal Percentage flow characteristic for accurate, proportional control across the full stroke range
- B-port: Modified flow characteristic engineered to maintain constant common port flow, ensuring system balance and consistent performance
- Flow coefficient (Cv): 7.4 — suitable for a wide range of commercial hydronic applications
Construction & Materials
- Body: Nickel Plated Forged Brass — corrosion-resistant and pressure-rated for hydronic service
- Ball: Chrome Plated Brass — smooth seating surface for tight shutoff and extended cycle life
- Stem: Nickel Plated Brass — durable and resistant to corrosion in wet piping environments
- 3-way configuration for mixing or diverting service
Specifications
- Size: 3/4 inch
- Connection Type: NPT (National Pipe Thread)
- Flow Coefficient (Cv): 7.4
- Configuration: 3-Way
- Maximum Temperature: 250°F
- Media: Chilled Water or Hot Water
Application
The B318B is ideal for use with Belimo actuators in fan coil units, air handling units, and terminal unit hydronic systems. Its 3-way design supports both mixing and diverting configurations, while the equal percentage A-port characteristic pairs seamlessly with modulating actuators for precise zone temperature control. The modified B-port flow characteristic helps maintain a constant flow rate through the common port, simplifying system balancing and improving overall hydronic performance.
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