-It should usually be closed Selection of the actuator permits failing the valve open or closed. Your description sounds like you want it to normally be closed and fail open upon loss of signal. -It should open within less than 10ms and stay open as long as it is activated This is very fast and most achievable on very small valves. -It should withstand air pressures up to 500psi The valve body and pressure containing components are easily obtained suitable for 500 psi. A pneumatic actuator signal would be unusual. -Its smallest inside diameter should not be smaller than 0.2 inches This is quite small and might be specified to prevent plugging. What is the capacity that must be released and over what time? You need to determine the body size. A quarter-inch ball valve from Whitey (Swagelok) is looking like your solution. -If possible, it should operate mechanically (no solenoids) I selected a pneumatic actuator based upon you mechanical description. Clarify if you mean a lever, or some other mechanism.

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