Belimo B338 Valve

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.

• 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.

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.