Lochinvar & A.O. Smith 100167442 Relief Valve

The Lochinvar & A.O. Smith 100167442 Relief Valve is a critical safety component designed for high-efficiency hydronic systems. This 30 PSI relief valve is engineered to protect the heat exchanger from over-pressure conditions by providing a precise discharge point. As a genuine OEM replacement part, it ensures total compatibility with the Lochinvar Knight WB series and various A.O. Smith water boilers. The 100167442 model features a 3/4-inch connection and is rated for systems up to 510 MBTU, making it a standard requirement for maintaining ASME compliance in residential and light commercial boiler loops. For technicians servicing high-efficiency condensing boilers, replacing a weeping or scaled pressure relief valve with this factory-spec component is essential for preventing system failure and water damage. This boiler safety valve is built to withstand the thermal cycling typical of the Lochinvar Knight and WHN models, providing long-term reliability in closed-loop heating applications.

• Precise Pressure Management: Factory-set at 30 PSI to prevent structural damage to the boiler heat exchanger.
• OEM Compatibility: Specifically designed for Lochinvar Knight (WB, WH, WHN) and A.O. Smith boiler systems.
• High Capacity Rating: Suitable for hydronic heating applications with ratings up to 510,000 BTU/hr.
• Direct Replacement: Replaces legacy part numbers including 100167417 and RLV2005 for seamless field installation.

What models are compatible with the 100167442 relief valve?
This valve is utilized across the Lochinvar Knight range, including WB 50-210 and WH 55-399 models, as well as several A.O. Smith water boiler series. Always verify the BTU rating of your specific unit before installation.

When should a boiler pressure relief valve be replaced?
Technicians should replace the 100167442 if the valve fails to reseat after testing, shows signs of mineral buildup (scaling) at the discharge port, or allows the system to exceed the 30 PSI set point.

Does this valve meet ASME safety standards?
Yes, this is an ASME-rated safety relief valve, ensuring it meets the rigorous mechanical standards required for pressurized hydronic heating 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.