Watts 0342682 Relief Valve

The Watts 0342682 Relief Valve (Series 330-30) is a contractor-grade pressure safety component engineered for residential and commercial hydronic heating systems. Featuring a 3/4 inch MxF (Male NPT x Female NPT) connection, this valve is fixed at a 30 PSI set point to protect low-pressure hot water boilers from over-pressurization. It is rated for a discharge capacity of 375,000 BTU/hr, making it a standard choice for most mid-sized boiler applications.

Constructed with a rugged bronze body, the 0342682 utilizes a high-temperature silicone disc and a stainless steel spring to ensure reliable seating and consistent pop-action in demanding environments. This model is a direct cross-reference for the Watts 3/4-M330-M1. It meets rigorous safety standards, including ASME Section IV and CSA certifications, ensuring code compliance for the installation of safety relief valves on hot water heating boilers.

Key Benefits:

• Optimized Pressure Control: Prevents catastrophic failure by relieving excessive pressure at a dedicated 30 PSI setting.
• High Thermal Resilience: Equipped with a silicone disc designed to withstand high-temperature hydronic cycles without sticking.
• Corrosion Resistant: The bronze seat and stainless steel internals provide long-term durability against aggressive water conditions.
• Universal Compatibility: Fits standard 3/4" NPT threads, serving as a drop-in replacement for the 330-30 series.

Common Questions:

Is this valve suitable for steam boilers?
No, this specific model is designed for hot water heating boilers only. For steam applications, an ASME Section I or VIII rated valve specifically for steam service is required.

Can I install this valve horizontally?
For proper performance and to meet ASME code, safety relief valves should typically be installed in the vertical upright position with the discharge piping sloped for gravity drainage.

What does the MxF connection signify?
The MxF signifies a Male NPT inlet and a Female NPT outlet, facilitating a direct connection to the boiler tapping while allowing for a standard discharge pipe configuration.

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.