When removing a manual valve from a fuel pipeline, which bolts on the valve should you loosen first to drain the fuel into a drip pan?

Loosening the bottom bolts on a manual valve is essential for draining fuel safely and effectively. By starting at the bottom, any fuel trapped within the valve is allowed to escape downward due to gravity, minimizing the risk of spills or splashes that could occur if the fuel were allowed to flow out from the top or sides. This approach helps to contain the fuel within a drip pan and prevents it from running along the pipeline or creating a hazardous situation.

Additionally, loosening the top bolts first could potentially cause fuel to spill out without warning, posing safety risks and environmental concerns. Therefore, ensuring that the bottom bolts are addressed first is the most practical approach during valve maintenance or removal in fuel pipelines.