Conbraco 10-615-25 Relief Valve

The Conbraco 10-615-25 Relief Valve is a high-capacity safety component engineered specifically for hot water heating boilers and supply systems. This ASME Section IV certified valve features a 1" Female NPT inlet and an expanded 1 1/4" Female NPT outlet, allowing for a high-discharge capacity of 5,011,000 BTU. Factory-set at 125 PSI, this Apollo 10-600 series valve utilizes a bronze body construction and a silicone seat to ensure resilient performance in demanding hydronic environments.

Designed for professional contractors, the 10-615-25 incorporates a fabric-reinforced molded diaphragm that effectively isolates the spring chamber from the water media, preventing mineral buildup and corrosion within the spring cage. The high-capacity pressure relief valve is rated for a maximum temperature of 250°F and meets National Board capacity requirements. Its elevated seat design facilitates superior drainage, reducing the risk of seat leakage or "simmering" near the set limit. This domestic-made safety relief valve is the standard for protecting large-scale boiler systems against overpressure conditions caused by control failure.

• Extreme Relieving Capacity: Delivers 5,011,000 BTU/hr to protect high-output commercial and industrial boilers.
• Corrosion Resistance: Durable ASTM B584 bronze body and spring cage provide longevity in harsh water conditions.
• Contamination Protection: Reinforced diaphragm isolates the internal spring from the fluid, preventing scale and debris interference.
• Optimized Discharge: Oversized 1 1/4" outlet reduces backpressure during full-flow discharge events.
• Reliable Sealing: High-grade silicone seat ensures tight shut-off and resists sticking after long periods of inactivity.

What is the maximum temperature rating for this valve?
This 10-600 series valve is rated for a maximum service temperature of 250°F (121°C).

Can this valve be used for steam applications?
No, the Conbraco 10-615-25 is specifically ASME Section IV certified for hot water service only. It should not be used in steam boiler applications.

Why is the outlet larger than the inlet?
The expanded 1 1/4" outlet is designed to accommodate the volume of water and flash steam during a relief event, ensuring the valve reaches its full BTU capacity without being restricted by discharge piping friction.

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.