The 4" Double Check Valve Assembly with OS&Y Low Flow Valve is engineered for fire protection professionals demanding reliable backflow prevention in sprinkler and standpipe systems. Designed to safeguard potable water supplies, it combines robust construction with code compliance to ensure system integrity in critical fire safety applications.

• Durable Construction: Main body crafted from ASTM A536 ductile iron with an epoxy coating to resist corrosion and mechanical wear typical in fire service environments.
• Corrosion-Resistant Internals: Internal components made from 300-series stainless steel provide strength and longevity under high-use conditions.
• Advanced Check Modules: Incorporates glass-filled thermoplastic for dimensional stability and EPDM elastomer seats that are reversible and replaceable for tight sealing and easy maintenance.
• Regulatory Compliance: UL Listed under UL 1469, FM Approved, meets ASSE 1015 and AWWA C510 standards, ensuring full alignment with fire protection and potable water safety codes.
• Operational Versatility: Suitable for pressures up to 175 PSI, supports both ANSI B16.1 flanged and AWWA C606 grooved end connections for flexible installation options.
• Visual Valve Position Indicator: OS&Y Low Flow valve design offers clear visual indication and straightforward operation for testing and maintenance.
• Installation Flexibility: Engineered for horizontal or vertical upward flow installations, adaptable to various mechanical rooms and vault configurations.
• Fire Safety Standards Integration: Supports NFPA 13 and NFPA 25 compliance with accessible test ports streamlining annual inspections and system certification.

This dual check valve assembly uniquely addresses the critical need for contamination prevention in fire protection systems, offering a dependable barrier against backflow that could compromise water quality. Its combination of sturdy materials, certified safety standards, and operational features reduces downtime by facilitating easy service and inspection without interrupting the fire suppression system. Ideal for fire safety contractors and facility managers, it balances durable performance with practical maintenance to safeguard health and infrastructure over the long term.