The Belimo B338 is a high-performance 1 1/2" 3-way characterized control valve designed for precise flow regulation in demanding hydronic systems. Featuring a nickel-plated forged brass body and a 304 stainless steel ball and stem, this mixing or diverting valve is engineered to withstand chilled or hot water applications up to 250°F. The A-port utilizes a specialized TEFZEL characterized disc to maintain an equal percentage flow characteristic, while the B-port is modified to ensure constant common port flow, preventing pressure surges during modulation. With a 19 Cv rating and compatibility with up to 60% glycol solutions, the B338 is the industry standard for AHU coil control and chiller bypass loops. Its blow-out proof stem design and EPDM O-rings provide a leak-proof seal under high differential pressures, ensuring long-term reliability for commercial mechanical contractors managing HVAC hydronic balancing. Key Benefits for Technicians Corrosion Resistance: Stainless steel trim prevents scaling and premature failure in open or closed loops. High Rangeability: Achieve precise temperature control even at low flow rates with the integrated characterizing disc. Low Maintenance: The chrome-plated brass or stainless steel ball reduces torque requirements, extending actuator life. Versatile Media Handling: Rated for water and glycol mixtures, ideal for freeze protection systems. Common Questions What is the maximum close-off pressure for the B338? This valve is rated for a close-off pressure of 200 psi, ensuring tight shut-off in high-head pressure systems. Can this valve be used for steam applications? No, the B338 is specifically rated for water and glycol solutions up to 250°F. For steam, a globe valve or high-temp resilient seated valve is required. Which actuators are compatible with the B338? It is designed to work seamlessly with Belimo LR, ARB, and GR series non-spring return or spring return actuators. 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.
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