Technical Specifications (Material Focus)
The 10" Double Check Assembly with OS&Y for Fire Protection is constructed to uphold rigorous fire protection and industrial plumbing standards. The main body consists of fusion-bonded epoxy-coated ductile iron (ASTM A536) engineered to resist corrosion and mechanical wear in demanding environments. Internally, the check modules incorporate glass-filled Noryl™ or an equivalent high-strength thermoplastic, balancing durability with reduced weight for ease of maintenance. The assembly uses 300-series stainless steel springs and fasteners to ensure resilient spring tension and corrosion resistance. Seating elements feature reversible and replaceable EPDM elastomer discs, designed to maintain a positive seal and prevent backflow reliably over extended service intervals.
Regulatory Compliance
This assembly is compliant with critical certifications to meet fire protection and potable water safety requirements:
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UL Listing: Certified to UL 1469 for fire service water control valves, confirming suitability for life-safety systems.
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FM Approval: Factory Mutual-approved for fire protection applications, verifying reliable performance under fire service conditions.
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ASSE 1015: Meets American Society of Sanitary Engineering standards specific to double check backflow preventers.
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AWWA C510 Compliance: Ensures adherence to American Water Works Association standards for backflow devices used in potable water systems.
The product supports compliance with
NFPA 13 for sprinkler system installation and
NFPA 25 for inspection, testing, and maintenance practices. Its pre-drilled test cocks enable straightforward annual testing and differential pressure verification to comply with local fire codes.
Operational Compatibility
This 10" Double Check Assembly is rated for a maximum working pressure of 175 PSI (12.1 bar), ensuring capacity for typical commercial and industrial fire protection systems. The temperature range for operation spans 33°F to 140°F (0.5°C to 60°C), accommodating varied environmental conditions without performance degradation. Connection options include flanged ends conforming to ANSI B16.1 standards and grooved ends meeting AWWA C606 specifications, providing flexibility for integration into existing piping infrastructures. It supports installation in horizontal or vertical configurations, with upward flow orientation for vertical setups, adapting to diverse fire system layouts.
Application Insight and Use Cases
Ideal for commercial and industrial facilities requiring robust backflow prevention in fire protection water lines, this assembly prevents pollutants from reversing into potable water supplies. Its OS&Y (Outside Screw & Yoke) gate valve offers dependable isolation to facilitate maintenance without system shutdown. The design minimizes pressure drop across the valve, maintaining system efficiency during fire system activation or routine flow conditions. Facilities in municipal or mixed-use environments benefit from its compliance with stringent drinking water and fire safety standards, making it suitable for schools, hospitals, manufacturing plants, and multi-story commercial buildings.
Practical Advantages Over Alternatives
Compared to other backflow prevention methods, this assembly's use of high-grade ductile iron combined with corrosion-resistant thermoplastics and stainless steel internal components extends service life, reducing long-term maintenance costs. The modular check modules allow for easy onsite repair without full unit replacement. The OS&Y valve integration enhances operational control, enabling clear indication of valve status and straightforward operation. Integration-ready with common fire sprinkler piping configurations, it avoids complex retrofit challenges seen with non-standard backflow assemblies.
Overall, the 10" Double Check Assembly with OS&Y merges stringent safety compliance, material robustness, and versatile installation options, delivering a reliable backflow prevention solution tailored for demanding fire protection applications.
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