Morrison Bros. 474 1 in. x 1 in. Farm Tank Emergency Valves w/ Nitrile Rubber Seals

Reliable Fire Protection for Gravity-Fed Fuel Storage

The Morrison Bros. 474 series is a critical safety component for small aboveground storage tanks, specifically engineered for bottom-outlet farm tank applications. This 1" x 1" angle-style valve utilizes a UL-listed 165°F fusible link to provide automated thermal shut-off. In the event of a fire, the link melts, triggering the internal spring-loaded mechanism to instantly stop product flow and prevent fuel from feeding the flames. Built with a durable brass body and standard nitrile rubber (Buna-N) seals, this valve provides a reliable seal for standard petroleum applications in a lightweight, 1 lb profile.

For site safety and compliance, please note the following technical specifications and operating requirements:

• Thread Configuration: 1" male NPT tank connection with a 1" female NPT outlet
• Pressure Rating: Designed for low-pressure gravity systems with a 5 PSI maximum.
• Operational Note: This is a safety device, not a primary block valve; it should never be opened under pressure and requires periodic inspection to verify the shut-off mechanism remains functional.
• Materials: Rugged brass construction with nitrile rubber (Buna-N) disc and O-ring for excellent fuel resistance.

Features

• Angle design
• Male threads install in into the tank, female threaded outlet
• 5 PSI maximum pressure rating
• 165°F fuse link is UL listed

Construction Details

• Body: Brass
• Disc: Nitrile Rubber (std), Viton® or Teflon®
• O-Ring: Nitrile Rubber (std) or Viton®