Which type of handles shall not be altered to hinder operation?

Valve handles are crucial for the safe operation of compressed gas systems, as they control the flow of gas from the cylinder. Any alteration to valve handles could compromise their functionality, leading to potential hazards. For instance, if a valve handle is modified to make it more difficult to operate, it could result in an inability to shut off the gas supply in an emergency, increasing the risk of leaks or explosions.

Maintaining the integrity and usability of valve handles is essential for ensuring safety and proper functionality. This focus on unaltered handles helps prevent accidents and promotes safe handling practices in environments where non-flammable compressed gases are used. In contrast, while other types of handles are important, the critical nature of valve operation underlines the necessity for them to remain unaltered.