Conbraco 29-402A-100 Valve

The Conbraco 29-402A-100, also identified under the Apollo Valves brand, is a heavy-duty ASME Section I steam pressure relief valve engineered for critical over-pressure protection in commercial and industrial boiler systems. Featuring a 1" Male NPT inlet and a 1-1/4" Female NPT outlet, this valve is factory-set to 100 PSI with a certified discharge capacity of 851 PPH (pounds per hour). The 29 Series utilizes a rugged bronze body and stainless steel springs to maintain seat integrity and prevent simmering under high-temperature loads. As a technician, you know that Section I National Board capacity certification is essential for jurisdictional compliance on power boilers. This industrial steam safety valve provides the necessary flow rates to prevent catastrophic shell failure while ensuring a clean blowdown and tight shut-off after a pressure excursion.

Technical Benefits for Contractors

• ASME Code Compliance: National Board certified for Section I "V" applications, ensuring this 100 PSI steam relief valve meets all legal safety mandates for power boilers.
• Optimized Flow Dynamics: A high-capacity 851 PPH steam flow rate allows for rapid depressurization, protecting heat exchangers and pressure vessels from structural damage.
• Corrosion Resistance: Built with premium metallurgy to resist scale buildup and thermal fatigue in continuous-duty steam environments.
• Standardized Fitment: The 1" x 1-1/4" NPT connection footprint allows for direct replacement on most popular boiler manifolds without extensive piping modifications.

Common Technical Questions

Is the Conbraco 29-402A-100 suitable for air or water service?
No, this specific model is an ASME Section I steam valve. For air or liquid applications, you must use a Section VIII or Section IV rated valve designed for those specific media to ensure correct relief characteristics.

Can the pressure setting be field-adjusted?
This valve is factory-set and sealed at 100 PSI. Breaking the lead seal for field adjustment voids the ASME certification and can lead to dangerous operational failures. Always match the set pressure to the Maximum Allowable Working Pressure (MAWP) of your vessel.

What is the difference between Section I and Section IV valves?
Section I valves like the 29-402A-100 are designed for power boilers operating over 15 PSI, whereas Section IV valves are intended for low-pressure heating boilers. Using the correct code-stamped valve is critical for passing inspection.

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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.