Lochinvar & A.O. Smith 100274785 Valve

The Lochinvar & A.O. Smith 100274785 Pressure Relief Valve is a critical OEM replacement part engineered for high-capacity commercial boilers and water heating systems. Featuring a robust 1-1/2" x 2" connection size and a factory-set 50 PSI pressure rating, this valve provides essential overpressure protection for heavy-duty hydronic applications. With a massive relief capacity of 4,237,000 BTU/hr, it is designed to meet strict ASME safety standards, ensuring precise discharge rates and preventing catastrophic equipment failure. This component serves as the direct cross-reference for part 0383792, offering a seamless fit for technicians maintaining Lochinvar and A.O. Smith industrial units. Built for durability in demanding environments, this ASME safety relief valve maintains system integrity by automatically venting excess pressure, making it the professional choice for ensuring code-compliant operation and long-term boiler performance in large-scale mechanical rooms.

Technical Benefits for Contractors

• Direct OEM Match: Provides an exact drop-in replacement for part number 100274785 and the older 0383792, eliminating field modification needs.
• High Discharge Capacity: Rated for 4,237,000 BTU, making it suitable for high-output commercial boiler safety requirements.
• Precision Set Point: Calibrated to 50 PSI to ensure reliable opening and closing cycles under extreme thermal expansion.
• Durable Construction: Engineered to withstand the rigors of industrial water heating environments without premature seat leakage.

Common Questions

Is the 100274785 valve compatible with other brands?
While primarily used in Lochinvar and A.O. Smith boilers, this valve is compatible with any system requiring a 1-1/2 inch x 2 inch relief valve rated for 50 PSI and meeting the specified BTU capacity.

What is the difference between this and part 0383792?
Part 100274785 is the official updated OEM number and acts as a direct replacement for the legacy part number 0383792.

When should this pressure relief valve be replaced?
Technicians should inspect the valve for leaks or mineral buildup at the seat. If the valve fails to reseat after testing or shows signs of corrosion, an immediate OEM replacement is necessary to maintain system safety.

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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.