Watts 0384042 Valve

The Watts 0384042 (Model 740-2-30) is a high-capacity boiler pressure relief valve engineered specifically for hot water space heating systems. Featuring a rugged iron body and a 2-inch FNPT inlet with a 2-1/2 inch expanded outlet, this valve is designed to manage high steam discharge rates up to 5,250,000 BTU/hr. As an ASME Section IV certified safety device, the 740 series ensures critical overpressure protection by utilizing a non-mechanical seat-to-disc alignment that eliminates sticking and freezing. The 30 psi pressure relief valve setting is maintained via a heavy-duty stainless steel spring, while a high-temperature resistant water seal isolates internal working parts from the media to prevent corrosion. For technicians conducting routine maintenance, the integrated test lever allows for easy manual operation to verify waterway clearance. This industrial hot water relief valve is the professional standard for large-scale hydronic applications requiring high-volume discharge capacities and reliable reseating performance.

• Enhanced Flow Dynamics: The 2" x 2-1/2" expanded outlet design allows for high-velocity steam discharge, exceeding the requirements of large-scale boiler headers.
• Foul-Resistant Seating: A raised seat located above the drain prevents sediment accumulation and water trapping, ensuring the Watts 740-2-30 triggers only when intended.
• Corrosion Protection: The internal spring and guide are protected by a thermal seal, isolating them from hot system water to prevent mineral buildup and mechanical failure.
• ASME Certified Safety: Fully compliant with ASME Section IV and National Board (NB) standards for emergency safety relief in commercial heating systems.

What is the steam discharge capacity of the 0384042?
This specific model provides a certified discharge capacity of 5,250,000 BTU/hr at a 30 psi set point, making it suitable for high-output commercial boilers.

What are the inlet and outlet connection sizes?
The valve features a 2-inch female NPT inlet and an expanded 2-1/2 inch female NPT outlet to facilitate rapid pressure drops during relief events.

Is the Watts 740-2-30 suitable for potable water systems?
No, this valve is designed strictly for hot water space heating boilers and non-potable hydronic applications. It lacks the lead-free certification required for drinking water systems.

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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.