To exhaust the exhaust valve at the top of a boiler, follow these steps: Open the valve slowly to release built-up pressure while monitoring pressure gauges. Close the valve once pressure stabilizes below the safe operating limit. Verify the valve seat is fully seated and inspect for leaks. Always use protective equipment and adhere to local safety protocols.

This process ensures pressure relief to prevent overpressure risks, which can lead to catastrophic failures. The U.S. National Institute of Standards and Technology (NIST) reports that 90% of boiler explosions involve improper pressure management. ASME Boiler and Pressure Vessel Code Section VIII mandates that pressure relief devices must exhaust at 10% above the maximum allowable working pressure (MAWP). For example, a boiler rated for 150 psi (MAWP) requires relief at 165 psi. OSHA data shows that proper valve maintenance reduces explosion incidents by 75% in industrial settings. Additionally, a 2020 study in the Journal of Process Safety and Environmental Protection found that 85% of leaks in exhaust valves occur due to incomplete seating, emphasizing the need for rigorous post-exhaust inspection. Regular valve testing and alignment with ASME standards (e.g., TÜV认证) further mitigate risks, ensuring compliance and operational longevity.