What type of valve is found on the oxygen cylinder, and why should it be opened all the way?

The correct answer identifies a back-seated valve for oxygen cylinders, which is specifically designed with safety in mind. Back-seated valves are constructed to create a tight seal when in the closed position while allowing a safe, controlled flow of gas when fully opened.

Opening the valve all the way ensures that the valve seat is fully engaged and allows for maximum flow of oxygen. This is crucial in applications requiring oxygen because any restriction caused by opening the valve partially could lead to improper function or increased pressure within the system, potentially causing a failure or hazard.

The design of the back-seated valve also minimizes the risk of leakage, as this type of valve inherently reduces the potential for oxygen to escape. In environments where oxygen is used, maintaining pressure integrity is paramount to ensure both safety and efficiency in delivery systems.