Watts 0382024 Valve

The Watts 0382024 (Model 740-3/4-40) is a high-capacity boiler pressure relief valve designed specifically for hot water space heating systems. Built with a rugged iron body construction, this valve features 3/4" x 1" FNPT connections with an expanded outlet to facilitate maximum discharge during emergency pressure spikes. Rated for a steam discharge capacity of up to 1,139,000 BTU/hr, it ensures critical system protection by maintaining a factory-set relief pressure of 40 psi. As a veteran-grade ASME Section IV relief valve, it utilizes a non-metallic disc-to-metal seating and a stainless steel spring to prevent sticking and freezing, even under corrosive water conditions.

For the service technician, the Watts 740 series offers a tactical advantage with its "above-drain" seat design, which prevents sediment from being trapped and fouling the seal. This hydronic safety valve is engineered for a maximum operating temperature of 250°F and includes a top-mounted test lever for manual operational checks. Whether you are performing a boiler maintenance cycle or a new installation, this unit provides reliable overpressure protection for commercial and large-scale residential hot water boilers.

• High Discharge Capacity: Rated for 1,139,000 BTU/hr to handle large-scale thermal expansion and steam relief requirements.
• Resists Sticking and Freezing: Features a non-mechanical seat-to-disc alignment that remains operational in harsh hydronic environments.
• Simplified Serviceability: The seat is located above the drain connection, ensuring water and sediment cannot be trapped within the valve body.
• Durable Construction: Heavy-duty iron body with a high-temperature resistant water seal to isolate the internal stainless steel spring from system fluids.

• What is the difference between individual part number 0382024 and 740-3/4-40? These are identical identifiers for the same 3/4" inlet, 1" outlet valve set at 40 psi.
• Can this be used on a potable water heater? No, this is an iron body boiler relief valve specifically designed for non-potable hot water space heating applications.
• Does this include the SentryPlus Alert sensor? Standard versions of the 0382024 may come with a flood sensor port, but connectivity kits for Building Management Systems are typically sold separately.

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.