Watts 0382009 Valve

The Watts 0382009 (Series 740) is a high-capacity boiler pressure relief valve engineered specifically for technical professionals managing large-scale hot water space heating boilers. Featuring an iron body construction with expanded outlet connections, this valve is designed to mitigate excessive pressure across various commercial and industrial boiler setups. With a 3/4" NPT female inlet and a 1" NPT female outlet, the Watts 740-3/4-35 provides a substantial steam discharge rating of 1,032,000 BTU/hr at a fixed 35 PSI set pressure. The internal architecture utilizes a non-metallic disc-to-metal seating and a stainless steel spring, ensuring the assembly resists corrosive water conditions and eliminates the risk of "sticking" or "freezing" common in lower-tier safety components. For precise system monitoring, this unit is compatible with the SentryPlus Alert flood sensor technology, allowing contractors to integrate discharge detection directly into building management systems.

Key Benefits for Contractors:

• ASME Section IV Certified: High-capacity protection rated at 1,032,000 BTU/hr for heavy-duty hydronic heating systems.
• Anti-Foul Design: The seat is positioned above the drain to prevent sediment buildup and water trapping, ensuring reliable emergency safety relief.
• Durable Construction: Features a rugged iron body and high-temperature resistant water seal to isolate the stainless steel spring from the discharge flow.
• Expanded Outlet: The 3/4 inch x 1 inch configuration allows for unrestricted discharge flow, exceeding standard outlet capacities for safety compliance.
• Testing Manual Lever: Integrated heavy-duty test lever for standard maintenance checks and system blow-downs.

Common Technical Questions:

Can this valve be used as an operating control?
No, the Watts 0382009 is strictly designed for emergency safety relief and must not be used to regulate system pressure during normal operation.

What is the maximum operating temperature for the Series 740?
This iron body relief valve is rated for a maximum temperature of 250°F (121°C), suitable for most high-demand heating applications.

Why does this model feature an expanded outlet?
The 1" expanded outlet ensures the discharge capacity reaches the necessary BTU rating by reducing backpressure during a relief event, a critical factor for ASME safety compliance.

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.