What should be checked before operating a valve under pressure?

Before operating a valve under pressure, it is crucial to check the condition of the valve. This is important because a valve in poor condition may not function properly, which can lead to leaks, failures, or even dangerous situations. A compromised valve could have issues such as corrosion, wear, or mechanical damage that might not be immediately visible. Ensuring that the valve is in good working order helps maintain safety and reliability in the plumbing system, especially when dealing with pressurized lines.

While the presence of lubricants, color coding, and temperature settings can be relevant considerations in various contexts, they do not take precedence over assessing the physical state of the valve itself, which is essential to ensure safe and effective operation.