this question is related to Ball valves, In actuated valve for the selection of actuator we need differential pressure across the valve so I wanted to know that what is meant by differential pressure?
When you have a valve with an actuator there is a need to know the pressure differential that can exist across the valve either in the closed position, the closing or opening step. This is because that adds an additional force that the actuator must be able to handle. In the case of a gate or ball valve, this force comes from the fact that the differential pressure tries to push the ball or gate toward the lower pressure direction and that jams the ball or gate against the downstream seat. Differential pressure is simply the up stream pressure minus the down stream pressure. Usually it is calculated when the valve is fully closed since that tends to be the time of maximum differential pressure. Of course in some cases the highest differential pressure may exist just before the valve is fully closed and the two pressures have a chance to stabilize.
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differential pressure is simply having a different pressure each side of the valve. In this case I think that means you need a difference in pressure to move the ball closing the valve.
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Differential Pressure Definition
