4" Double Check Detector N Pattern With OSY Valve System

Protect your commercial and residential water supply with the 4" Double Check Detector N Pattern with OS&Y Valve System by Ames Backflows, designed for reliable flow control and contamination prevention in fire protection networks. This assembly safeguards potable water supplies by blocking contaminated water from re-entering clean systems during critical fire protection and plumbing operations.

The compact N pattern is optimized for tight spaces in mechanical rooms and underground vaults. Built to support NFPA 13 and 25 standards, it features pre-drilled test cocks and an Outside Stem and Yoke (OS&Y) valve that gives you a clear visual indication of valve status for easy monitoring. The visual valve indicators and reversible seats reduce maintenance downtime so you can pass regulatory inspections with confidence.

Key Features & Construction

• Durable Body: Built with a fusion-bonded epoxy-coated ductile iron body (ASTM A536) and 300-series stainless steel internals to resist corrosion.
• Valve Components: Glass-filled Noryl thermoplastic double check modules provide resilience under variable pressures and stresses.
• Replaceable Seals: Reversible and replaceable EPDM elastomer seats maintain a leak-proof seal and simplify maintenance without system shutdowns.
• OS&Y Integration: Outside Stem and Yoke valve gives you a clear visual indication of valve status for easy monitoring.
• Operational Limits: Handles up to 175 PSI (12.1 bar) working pressure in horizontal or vertical upward flow orientations.
• Connections: Integrates into piping systems using ANSI B16.1 flanged and AWWA C606 grooved end connections.

Technical Specifications & Compliance Table

Submittal & Installation Note: Verify local Authority Having Jurisdiction (AHJ) requirements and consult manufacturer technical data sheets before installation. This assembly is non-refundable and non-cancellable.

Documentation: Download Manufacturer Technical Data & Cut Sheet (PDF)