Watts 0383802 Valve

The Watts 0383802 is a high-capacity boiler pressure relief valve designed specifically for hot water space heating systems. Built with a rugged iron body and a 1-1/2 inch NPTF female inlet, this Series 740 valve is set to a fixed pressure of 65 psi to protect commercial and industrial boiler equipment from over-pressurization. It features expanded outlets (1-1/4 inch NPTF) to accommodate increased discharge volume, ensuring the system maintains safe operating limits during thermal expansion or runaway conditions.

For technicians monitoring system health, this unit includes an integrated SentryPlus Alert flood sensor. This discharge line sensor detects excessive water flow, though activation requires a separate connectivity kit for building management system (BMS) integration. The internal non-metallic disc-to-metal seating and stainless steel spring are engineered to prevent sticking and freezing, while the raised seat design ensures sediment does not foul the watertight seal. This ASME Section XIII certified safety relief valve is a standard component for contractors managing high-BTU hydronic installations where reliable pressure management is critical.

Key Benefits

• High-Capacity Discharge: Features expanded outlets to handle significant liquid or steam volume during emergency relief events.
• Advanced Seat Design: The non-mechanical disc alignment and raised seat prevent sediment buildup and "simmering" leaks.
• Integrated Flood Detection: Equipped with a SentryPlus Alert sensor to provide early warnings of relief valve discharge.
• Durable Construction: Heavy-duty iron body with a 250°F maximum temperature rating for demanding hydronic environments.
• Technician-Friendly Testing: Includes a top-mounted test lever for manual verification of waterway clearance.

Common Questions

What is the BTU rating for this valve?
The BTU/hr relief capacity depends on the pressure setting; at the 65 psi set point, this valve is rated for high-output commercial boilers. Always verify the valve rating exceeds the boiler's gross output.

Does the flood sensor work out of the box?
The sensor is pre-installed in the 0383802, but you must purchase a cellular or BMS activation kit to receive remote notifications.

Can this be used for potable water systems?
No, Series 740 valves are specifically designed for hot water space heating boilers and are not intended for potable water applications.

This item is not eligible for free shipping.

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.