Conbraco 10-408-05Q Valve

When you're servicing mid-size hydronic systems or commercial boilers, the Conbraco 10-408-05Q Valve is a standard-setting choice for over-pressure protection. This ASME Section IV hot water pressure relief valve is specifically designed to manage thermal expansion and safeguard equipment against critical control failures. Featuring a 3/4" female NPT inlet and a 3/4" female NPT outlet, it integrates seamlessly into existing piping to provide a high-capacity discharge of up to 535,000 BTU/hr. The unibody brass hot water pressure relief valve construction, paired with a corrosion-resistant stainless steel spring and a durable silicone seat, ensures a positive seal and reliable pop-off performance even in high-temperature service up to 250°F. Every unit is factory set at 30 PSI and includes a technical test report to verify compliance with stringent safety standards for modern hydronic heating systems.

• High-Capacity Safety: Certified by ASME Section IV to handle 535,000 BTU/hr, protecting a wide range of commercial boilers.
• Rugged Reliability: Built with an ASTM B584 bronze body and a silicone seat for long-term resistance to heat and scale buildup.
• Verified Performance: Includes an official test report, crucial for documentation and inspections on industrial and residential jobsites.
• Simplified Installation: Standard 3/4 inch NPT connections allow for direct replacement in hot water heating systems without specialized adapters.

Can this valve be used for steam boiler applications?
No, this is an ASME Section IV relief valve rated specifically for hot water service and thermal expansion; steam systems require Section I or Section VIII safety valves depending on the pressure rating.

Where should the discharge piping be directed?
The 3/4" outlet must be piped to a safe point of discharge, typically 6 inches above a floor drain, using a pipe size equal to or larger than the valve outlet to prevent backpressure.

Is this valve suitable for potable water heaters?
While it handles hot water, verify local codes as most domestic water heaters require a combined Temperature and Pressure (T&P) relief valve, whereas this is a pressure-only relief valve for hydronic loops.

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.