Watts 0383025 Relief Valve

The Watts 0383025 is a high-capacity boiler pressure relief valve from the 740 series, engineered specifically for large-scale hot water heating systems. This 1-1/4 inch NPT relief valve is designed to manage thermal expansion and protect against over-pressurization with a factory set point of 40 PSI. Built with a rugged iron body and a forged bronze inlet, this valve is rated for a massive 2,590,000 BTU/hr discharge capacity. The design features a non-stick, non-metallic disc-to-metal seat located above the drain to prevent sediment accumulation from fouling the seal. A stainless steel spring ensures consistent response, while the 1-1/2 inch expanded outlet allows for high-velocity discharge without restriction. This model is a direct replacement for 740-1 1/4-40 units and includes a manual test lever for verifying seat clearance. It is strictly an emergency safety device and is not intended for use as an operating control.

• ASME Rated Protection: Provides a certified 2,590,000 BTU/hr discharge capacity at a 40 PSI set point for high-output hydronic boilers.
• Foul-Resistant Seat: The seat is positioned above the discharge level to ensure gravity prevents sediment and water from being trapped, resisting sticking and freezing.
• Expanded Outlet Design: 1-1/2 inch female NPT outlet accommodates high-volume steam or water discharge, reducing backpressure on the internal spring.
• Durable Construction: Features a heavy-duty iron body, bronze-to-non-metallic seating, and a corrosion-resistant stainless steel spring for longevity in demanding environments.

What is the relief capacity of the Watts 0383025?
This valve is rated for 2,590,000 BTU/hr, making it suitable for large commercial or industrial hot water space heating equipment where 40 PSI is the maximum allowable working pressure.

Does this valve come with a flood sensor?
While newer Watts 740 series units often include a SentryPlus Alert sensor, verify your specific SKU. This 1-1/4 inch model is a standard mechanical safety relief valve designed for high-flow emergency discharge.

Can the pressure set point be adjusted in the field?
No. The 40 PSI setting is factory-calibrated and sealed to meet ASME safety standards. Tampering with the spring tension can compromise boiler safety and void code 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.