What is required to open a slow opening valve?

The correct requirement for opening a slow opening valve involves making at least five full 360° turns. Slow opening valves are designed to gradually control the flow of fluids in a system. This gradual opening is essential for preventing sudden pressure changes that could lead to system instabilities or water hammer effects.

When the valve requires multiple full turns to open, it allows for a more controlled and gentle increase in flow, making it safer for both the mechanical components involved and the overall system. Each turn progressively opens the valve, which contributes to a steady increment in flow rate rather than an abrupt change.

In contrast, other responses suggest fewer turns, which would not achieve the gradual opening necessary for the intended purpose of a slow opening valve. This method of operation is crucial in applications such as steam systems or other pressurized fluid systems where controlled flow is vital for maintaining operational integrity and safety.