What would happen to a fail open valve if pneumatic pressure is maintained?

A fail open valve is designed to remain in an open position when there is a loss of power or pressure applied to it. When pneumatic pressure is maintained, the valve will not close because its default position in the event of pressure loss is to stay open.

Since pneumatic pressure is applied to the valve in this scenario, the mechanism that keeps the valve open is supported, allowing the valve to function as intended. This is typically critical in processes where flow must continue uninterrupted, such as in cooling systems or to ensure safety in emergency situations.

Thus, if pneumatic pressure is maintained, the valve will remain open, facilitating continuous flow through the system as prescribed by its design. The other options would imply an incorrect operation based on the intended purpose and design of a fail open valve.