Watts 0383484 Valve

The Watts 0383484 (Series 740) is a high-capacity boiler pressure relief valve engineered specifically for commercial and industrial hot water space heating applications. Featuring a 1-1/4 inch NPT female inlet and an expanded 1-1/2 inch NPT female outlet, this ASME Section IV certified valve is designed to handle a massive discharge capacity of 4,285,000 BTU/hr at a 75 PSI set pressure. Its iron body construction and stainless steel spring ensure durability in demanding hydronic environments, while the non-metallic disc-to-metal seating provides a positive shut-off and prevents common "sticking" or "freezing" issues. This HVAC pressure safety valve includes a raised seat design that prevents water and sediment from being trapped, protecting the spring and internal working parts from scale and fouling. This industrial relief valve further integrates a factory-installed flood sensor, allowing technicians to pair it with a SentryPlus Alert system for remote discharge monitoring via BAS or cellular networks. Use this hot water boiler safety valve to ensure code compliance and reliable overpressure protection for large-scale hydronic systems.

• Extreme Discharge Capacity: Rated for 4,285,000 BTU/hr, making it suitable for high-output commercial boilers.
• Expanded Outlet Design: A 1-1/2" outlet reduces backpressure and allows for greater flow rates compared to standard pipe sizes.
• Corrosion Resistance: Engineered with an iron body and stainless steel spring to withstand aggressive system water conditions.
• Flood Detection Ready: Includes an integrated sensor that communicates via Modbus or Nexa when paired with an activation kit.
• Anti-Foul Seating: The seat is positioned above the drain, ensuring sediment cannot accumulate and compromise the seal.

What is the maximum operating temperature for this valve?
The Watts 740-1 1/4-75# is rated for a maximum temperature of 250°F (121°C).

Does this valve meet National Board requirements?
Yes, it is ASME rated and tested by the National Board of Boiler and Pressure Vessel Inspectors.

Can I use this for potable water applications?
No, this valve is designed for non-potable hot water space heating boilers only. For domestic water heaters, use a T&P valve.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.