Conbraco 10-614-34 Valve

The Conbraco 10-614-34 (Apollo RVW61) is an ASME Section IV certified high-capacity hot water pressure relief valve designed specifically for heavy-duty protection of hydronic heating boilers and storage systems. Featuring a rugged bronze body construction and 150 PSI factor set pressure, this 3/4" FNPT inlet x 1" FNPT outlet valve is engineered to handle massive thermal loads with a 3,655,000 BTU/hr capacity. To ensure long-term reliability in aggressive water conditions, it utilizes a silicone seat and a fabric-reinforced molded diaphragm that effectively isolates the spring from the media. The expanded 1-inch outlet reduces backpressure during discharge, while the elevated seat design ensures proper drainage of water away from the sealing surface. This industrial-grade safety valve maintains an HV rating and is the standard choice for contractors needing a high-capacity relief valve that prevents over-pressurization due to control failure or runaway BTU input.

• Maximum BTU Throughput: Rated for up to 3,655,000 BTU/hr, making it suitable for large commercial boilers and high-demand hydronic systems.
• Durable Bronze Internals: The corrosion-resistant bronze spring cage and body ensure structural integrity under consistent 250°F maximum operating temperatures.
• Advanced Diaphragm Protection: The fabric-reinforced diaphragm prevents mineral buildup and water contact with the spring, extending the service life of the Apollo 10-614-34.
• ASME Section IV Compliance: National Board capacity certified to meet strict safety codes for hot water heating equipment.

What is the difference between the inlet and outlet sizes?
This valve features an expanded outlet—a 3/4 inch inlet and a 1 inch outlet. This design facilitates greater discharge flow and reduces the risk of backpressure, which is critical for high-capacity pressure relief applications.

Is this valve suitable for steam applications?
No, the 10-614-34 is built for hot water heating boilers and supply systems. It is not rated for steam service; for steam applications, an ASME Section I or VIII valve should be selected based on the system's specific requirements.

Can the pressure setting be adjusted in the field?
This is a factory-set 150 PSI relief valve. Field adjustments are not recommended as they can void the ASME certification and compromise the safety of the boiler system.

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.