BASICALLY AT OVC CONDITION PUMP OPERATE AT FULL LOAD TORQUE CONDITION WHEREAS IN CVC IT IS THE % OFBKW AT SHUT OF HEAD DIVIDED BY BKW AT DUTY POINT.THERE IS ALSO A TORQUE -SPEED (T %26amp; N2) CURV FOR BOTH OVC %26amp; CVC.What is closed valve control(CVC) %26amp; open valve control(OVC)%26amp;which one is used when in centrifugal pumps?
There are NC-Normally closed and NO-Normally open control valves. NC is closed for normal operation or for given set point of parameter. If it opens the control parameter gets disturbed. Reverse is true for Normally Open valves. It is truely process requirement that which valve is used where.
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