350AST Double Check Backflow Preventer Valve Double Detector Assembly with OS&Y Valves

This series of high-performance backflow prevention assemblies is engineered specifically for commercial, industrial, and residential fire protection systems. Designed to safeguard potable water supplies from contamination caused by backpressure or backsiphonage, these valves ensure system integrity and compliance with strict health and safety standards.

• Durable Construction: Crafted from superior corrosion-resistant materials, including high-grade stainless steel and fusion-bonded epoxy-coated ductile iron. These robust housings are built to endure demanding environments, providing an extended service life and reduced maintenance.
• Dual Check Mechanisms: Features two independent, spring-loaded check modules—often utilizing high-strength glass-filled thermoplastic—to create a redundant and reliable barrier against reverse water flow.
• Versatile Installation: Designed for maximum flexibility, these assemblies support both horizontal and vertical "flow-up" orientations. They are compatible with various connection types, including ANSI flanged and AWWA grooved ends, facilitating fast and secure integration into existing infrastructure.
• Simplified Maintenance: Engineered with accessible internal components and reversible EPDM elastomer seats, allowing for easy servicing and part replacement without removing the entire valve from the line. This design significantly reduces system downtime and operational costs.
• Integrated Monitoring & Control: Many configurations incorporate a metered bypass system to detect low-flow demands, leaks, or unauthorized water usage. Available valve options, such as OS&Y (Outside Stem & Yoke) gate valves, provide clear visual indication of the valve’s open or closed status for streamlined inspections.
• Technical Specifications: Built to perform under pressure, these units typically support operating pressures up to 175 PSI and water temperatures ranging from 33°F to 140°F.
• Certified Safety Standards: These assemblies are designed to meet rigorous industry benchmarks, including UL and FM approvals, ASSE 1015 certification, and adherence to NFPA 13 and NFPA 25 codes.

By combining robust materials with advanced flow detection technology, these backflow preventers provide peace of mind for facility managers and fire safety professionals. Whether protecting against stagnant water or chemical backflow, these valves ensure that fire suppression systems remain ready and potable water remains clean, preserving both infrastructure and public health.

Specifications: https://www.zurn.com/media-library/web_documents/pdfs/specsheets/bf-350astda-pdf