Watts 0382822 Relief Valve

The Watts 0382822 (Series 174A) is a high-capacity boiler pressure relief valve designed specifically for large-scale commercial and institutional hot water heating systems. Featuring a 1-inch NPT threaded inlet and outlet, this valve is factory-set to trip at 55 PSI to protect equipment from over-pressurization. Its robust construction includes a bronze body and a silicone rubber disc that provides consistent reseating even after multiple lift cycles. As a 1 inch 55 lb relief valve, it is ASME Section IV certified, ensuring it meets strict safety codes for HVACR installations. For technicians, this Watts 174A 1 inch model is the standard for replacement in systems requiring high BTU discharge capacities. Correct installation requires a vertical orientation with the discharge piping piped to a floor drain to ensure safe thermal expansion management and reliable HVAC pressure regulation under peak load conditions.

• High BTU Discharge Capacity: Engineered for large hot water boilers, ensuring rapid pressure relief during critical spikes.
• Bronze Body Construction: Provides superior corrosion resistance and durability in harsh mechanical room environments.
• Mechanical Lift Lever: Allows for easy periodic testing to ensure the internal spring and disc remain operational.
• ASME Section IV Certified: Validates that the valve meets industry-standard safety ratings for commercial water heating.
• Resilient Silicone Disc: Designed for high-temperature applications, preventing seat leakage and ensuring a tight seal after discharge.

What is the maximum BTU rating for this relief valve at 55 PSI?
The Watts 174A series at a 55 PSI setting provides a high BTU/hr discharge capacity tailored for commercial boilers; always verify the boiler's output does not exceed the valve's certified rating on the nameplate.

Can this valve be used for potable water heating or storage tanks?
No, the Series 174A is specifically designed for space heating boilers. For potable water or domestic hot water heaters, a T&P valve or a dedicated potable water expansion valve is required.

What is the standard orientation for installing the Watts 0382822?
This valve must be installed in a vertical position with the discharge line sloped downwards to prevent water from pooling near the valve seat, which could lead to mineral buildup.

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