What type of valve should be kept closed at all times?

A container valve should be kept closed at all times to prevent the loss of fuel oil and to maintain safety within the storage system. Maintaining the valve in a closed position ensures that there is no risk of leakage or spillage, which could pose environmental hazards or create fire risks.

Container valves are typically situated at the point of fuel storage, acting as the primary barrier between the stored fuel and the surrounding environment. Keeping them closed minimizes the chances of unauthorized access, accidental operation, or system malfunction, thereby enhancing overall safety and containment effectiveness.

In contrast, other types of valves, such as safety valves, control valves, and shut-off valves, play specific roles in managing flow and pressure within the system but are not necessarily required to remain closed at all times. Safety valves, for example, are designed to open under specific conditions to relieve excess pressure, while control valves regulate flow based on operational needs. Shut-off valves may be used to stop flow temporarily during maintenance or in emergencies, but they serve a function that differs from the constant closure required of container valves.