There is a 17" bore valve on display at exposition park that was for a apollo first stage F1 engine fuel shut off. It was like 1/10 of a second from closed to open and open to closed.

Awsome video and presentation. I just would love to know what application would these huge valves would be used for????

The term “severe service” has been used to develop new valve markets and even create popular new valve types, such as severe service ball valves. That term also has likely been misapplied as much as it has been correctly used. If you are a process control operator in a plant, you might consider every energy-containing pipe run and valve to be severe service, since the results of a valve failure could be costly or hazardous to your health. Although virtually every valve contains potentially dangerous energy or controls potentially hazardous fluid, the degrees of danger vary. These service criteria are used to determine the valve’s design or the robustness of a valve to safely handle a particular service application.

Often a standard off-the-shelf, “general purpose” vanilla valve will suffice in a particular service and perhaps last for decades without replacement. When a few operating or fluid characteristics are changed, the vanilla valve may need to have a bit of chocolate syrup and a cherry on top (a fit-for-purpose valve) to operate effectively. And when the combination of service criteria is harsh, a banana-split (severe service valve) is called for.