055607 Mechanical Gas Valve 1 1/2 in

The Ansul 055607 Mechanical Gas Valve (1-1/2") is a mission-critical safety component designed to integrate seamlessly with ANSUL R-102 and PIRANHA fire suppression systems. In a commercial kitchen fire, the extinguishing agent (ANSULEX) is only half of the solution; the other half is the immediate isolation of the fuel source. The 055607 valve provides an automatic, mechanical fail-safe that snaps shut the moment the fire system is triggered, preventing the gas line from feeding a fire and significantly reducing the risk of a catastrophic re-flash.

Engineered for high-volume gas lines, the 1-1/2" NPT 055607 model is typically installed on the main supply line serving multiple appliances, such as heavy-duty ranges, charbroilers, and large deep-fryer batteries. Because it is a purely mechanical device, it does not rely on electrical power or solenoids to function, ensuring it remains operational even during a total building power failure. This valve is a primary requirement for meeting NFPA 17A and NFPA 96 standards for commercial cooking operations.

How the Mechanical Shutoff Sequence Works

The Ansul 055607 is a "Normally Open" valve that is held in the open position by the tension of the system's actuation cable.

1. Detection: When a fire occurs, a fusible link in the exhaust hood melts, or the manual pull station is activated.
2. Actuation: The ANSUL AUTOMAN release mechanism triggers, releasing the tension on the 1/16" stainless steel cable.
3. Isolation: The internal spring-loaded mechanism of the 055607 valve is released, instantly forcing the valve disk into the closed position.
4. Starvation: By cutting off the gas supply before or simultaneously with the discharge of the liquid agent, the fire is starved of its fuel, allowing the cooling agent to work more effectively.

The Ansul Engineering Advantage: Built for the "Hot Line"

• High-Flow Capacity (1-1/2" NPT): This model is designed for high-BTU kitchen lines, ensuring that the fire safety system does not cause a pressure drop during peak cooking hours.
• UL & ULC Listed: The 055607 is fully listed for use with flammable gases. Using a non-listed valve can void the fire suppression system's UL listing and lead to failed inspections.
• Corrosion-Resistant Internals: Commercial kitchens are humid and grease-laden. Ansul utilizes specialized internal coatings and heavy-duty springs to ensure the valve won't "seize" or stick in the open position after years of service.
• Mechanical Reliability: Unlike solenoid valves, which can fail due to electrical surges or wiring issues, the mechanical design of the 055607 ensures a physical, spring-forced closure every time.

The 1-1/2" gas valve is the standard specification for medium-to-large professional kitchens:

• High-Volume Restaurants: Protecting the main gas manifold for busy cooking lines in steakhouses and high-output chain restaurants.
• Institutional Facilities: Essential for school cafeterias, hospital kitchens, and university dining halls where safety codes are strictly enforced.
• Hotel Kitchens: Provides a central shutoff for large kitchen suites where multiple appliances are connected to a single high-capacity supply line.
• Food Processing & Commissaries: Used in light industrial food preparation where high-BTU gas equipment is in constant operation.

To remain compliant with NFPA 17A, the 055607 gas valve must be part of your semi-annual fire system inspection:

• Tension Verification: Every 6 months, a certified technician must verify that the cable tension is correct. A loose cable can cause a "nuisance closure," shutting down your kitchen unnecessarily.
• Trip Testing: During the system's semi-annual test, the technician will "trip" the system to ensure the valve snaps shut fully and instantly.
• Visual Inspection: The valve body and the gas line connections should be checked for signs of physical damage, corrosion, or grease buildup that could interfere with the mechanical trigger.
• Manual Reset: Once the valve has been tripped (either during a test or a fire), it must be manually reset by a professional to ensure the gas supply is safely restored and all appliances are properly relit.

Do I need a separate valve for every appliance?
No. Typically, a single 1-1/2" mechanical gas valve is installed on the main gas line serving all appliances under the protected hood. This ensures that when the system activates, the entire "hot line" is safely isolated at once.

Can I use this valve with a different brand of fire system?
The 055607 is specifically designed and listed for use with ANSUL hardware. Using this valve with a different brand of fire suppression system may not only be unsafe but will likely violate the UL listing of the entire system.

What is the difference between a mechanical valve and a solenoid valve?
A mechanical valve (like the 055607) is triggered by a physical cable. A solenoid valve is triggered by an electrical signal. Mechanical valves are often preferred in kitchens because they do not require an electrician for installation and are immune to electrical failures during a fire.