Which direction would a normally open valve move if there were a small leak in the pneumatic line?

In a pneumatic control system, a normally open valve is designed to allow the flow of air or fluid when not subjected to any additional input. If there is a small leak in the pneumatic line, it typically leads to a reduction in pressure within the system.

When the pressure drops due to the leak, the force exerted on the diaphragm or actuator of the normally open valve decreases. Since the valve is normally open, a reduction in pressure can cause the valve to open more to compensate for the loss of air pressure in the system. This increased opening would aim to maintain the flow and balance the pressure differential created by the leak.

In summary, a small leak in the pneumatic line would result in the normally open valve moving to a more open position to ensure that the system continues to function effectively, thereby making the answer accurate in the context of how pneumatic systems react to pressure changes.