Which valve automatically closes if not held open by an operator?

Which valve automatically closes if not held open by an operator?

• A. Ball Valve
• B. Check Valve
• C. Gate Valve
• D. Deadman Valve

Answer: (D)

A valve that must be continuously held open by an operator to stay in the open position is a safety feature used to ensure flow stops if the operator releases or becomes incapacitated. This is the deadman valve, which is designed so that the actuation returns to the closed position if the operator lets go—often via a spring return or similar mechanism. In bulk oil storage operations, this means you won’t have unintended continuous flow if someone isn’t actively holding the control, helping prevent spills or leaks. This behavior sets it apart from other valves. A ball valve is a manual shut-off device that stays in whatever position you leave it, unless someone turns it again. A check valve automatically closes due to flow reversal to prevent backflow, but it doesn’t require or rely on an operator to hold it open. A gate valve also remains in its set position and does not automatically close when released. Therefore, the valve that automatically closes if not held open by an operator is the deadman valve.

A valve that must be continuously held open by an operator to stay in the open position is a safety feature used to ensure flow stops if the operator releases or becomes incapacitated. This is the deadman valve, which is designed so that the actuation returns to the closed position if the operator lets go—often via a spring return or similar mechanism. In bulk oil storage operations, this means you won’t have unintended continuous flow if someone isn’t actively holding the control, helping prevent spills or leaks.

This behavior sets it apart from other valves. A ball valve is a manual shut-off device that stays in whatever position you leave it, unless someone turns it again. A check valve automatically closes due to flow reversal to prevent backflow, but it doesn’t require or rely on an operator to hold it open. A gate valve also remains in its set position and does not automatically close when released. Therefore, the valve that automatically closes if not held open by an operator is the deadman valve.