UL OS&Y Gate Valve Supervisory Switch for tamper detection to meet NFPA Compliance

The Model HOS is mainly used in Fire Sprinkler system & Fire Suppression system to monitor the open/close status of an OS&Y (outside screw and yoke) gate valve, typically to ensure they are open and the system is ready to deliver water in case of a fire.

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Key Features and Benefits UL Supervisory Switch for OS&Y Gate Valve

• Sprinkler System Monitoring: Ensures the main water supply valve is open so water can reach the sprinkler heads in the event of a fire. It is Common in wet-pipe, dry-pipe, and pre-action systems.
• Tamper Detection: Alerts building management or fire services if someone accidentally or deliberately turns the valve off. It prevents dangerous situations where a fire could occur but the water is shut off.
• Fire Alarm Integration: Connects to the fire alarm control panel (FACP). Triggers a supervisory (trouble) signal, not a fire alarm, so corrective action can be taken before an emergency.
• Compliance with Codes: Required by NFPA 13 and NFPA 72 codes for fire protection systems. It helps meet the insurance and fire marshal requirements.

Frequently Asked Questions(FAQ) about UL Supervisory Switch for OS&Y Gate Valve

Q: If a site without Supervisory Switch for OS&Y Gate valve, any potential problems might occur?

• Undetected Valve Closure: Without a supervisory switch, there’s no way to detect this remotely. No warning signal is sent to the fire alarm panel or monitoring center. During a fire, no water will be available to suppress flames which is increasing damage, danger to life, and possible fatalities.
• Violation of Fire Codes: NFPA 13 (Standard for the Installation of Sprinkler Systems) and NFPA 72 (National Fire Alarm and Signaling Code) require valve supervision. Without a supervisory switch, the system may not pass fire inspections.
• Insurance Issues: If a fire occurs and the valve was shut without detection, and there was no supervisory switch, the insurance company may deny claims.
• Lack of Early Warning for Maintenance Errors: Valves may be left closed after maintenance or testing. Without supervision, this mistake goes unnoticed.

Catalogue(Model UL-HSO) Add to Inquiry