Thermodynamically, the normal force exerted by a homogeneous liquid or gas, per unit of area, on the wall of the container.
A device which responds directly or indirectly to deviation from a desired pressure by actuating a control or initiating a control sequence.
The flow rate through a flow control device varies in response to changes in system pressure.
Pressure Independent (PI)
The flow rate through a flow control device is not affected by changes in system pressure.