The Viking VXD PTR Double Interlock Preaction System is an advanced fire suppression assembly engineered for critical environments where preventing accidental water discharge is vital. This pre-trimmed riser (PTR) integrates directly into commercial and industrial fire sprinkler networks to protect sensitive facilities such as data centers, museums, archives, and cold storage. Utilizing a double interlock configuration, the system requires two independent conditions—the activation of an electric fire detection system and a drop in supervisory pressure—before water enters the piping. This dual-activation mechanism safeguards mission-critical assets against secondary water damage.

Designed to satisfy NFPA 13 compliance requirements, the assembly features a monitored release solenoid that continuously ensures the integrity of the release circuit. The integrated EA-1 Electronic Accelerator samples air pressure twice per second, enabling rapid response times during a confirmed fire event.

• Double Interlock Design: Requires both detection system activation and supervisory pressure drop to prevent accidental water release.
• Pre-Trimmed Riser (PTR): Arrives largely pre-assembled with a Model VXD Deluge Valve, riser check valve, and necessary trim to eliminate on-site pipe cutting.
• EA-1 Electronic Accelerator: Microprocessor-equipped unit monitors air pressure twice per second for fast activation speeds.
• Monitored Release Solenoid: Maintains circuit integrity to meet NFPA 13 compliance standards.
• Corrosion-Resistant Piping: Galvanized steel construction delivers durability and a long service life in demanding commercial installations.
• Groove/Groove Connections: Streamlines field maintenance and diagnostic procedures.

Contractors must verify local Authority Having Jurisdiction (AHJ) mandates and consult the manufacturer technical data sheets prior to beginning installation.

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