Second, calculate the NPSH available (NPSHa). This value represents the absolute pressure available at the pump inlet. If the NPSHa is 3 feet more than the NPSHr, the pump will not cavitate. Be aware, NPSHr is measured under ideal conditions for repeatability and accurate bench...
Note that for quarter-turn valves, it’s not possible to calculate the valve’s torque demand accurately. Instead, physical measurement of each valve size under various differential pressure conditions is required. Screenshot via Sizing and Selection of Actuators for Valves, SlideShare Due to the ...