Closing time for fuel system shut-off valve (Any valve but best of all would be for motor controled ball valve).For fuel supply to burner management systems, the typical closing time required is 1 second. A few allow up to 5 seconds for the system, but when you break it down into each action that has to happen for the signal to be sent to the valve to close, it leaves around 1 second for the valve to shut. Most of fuel shut-off valves in burners are fairly small ball valves. 1 and 2 inch sizes. Can get as small as 1/2 inch pipe sizes. For larger burners, they can get up to 8 inch. Hundreds of thousands of ball valves used in these applications all over the world and all of them closing this fast. So don't get derailed by waterhammer and other misdirections. Most are pneumatically operated to open with spring closure. Solenoid valve control the air in/out. Can't think of any electric operator that can close a ball valve in 1 second. Hydraulic operation can achieve these speeds, but is very expensive and messy. What is used on burner management systems is probably too large for aircraft. If your pipe size is less than 1/4 inch, you have reached the low size limit to practically make a ball valve.

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