Pump recycle control, also known as pump re-circulation flow control, is implemented to keep the pumps operating at a point on their curve. This preventative measure reduces over-pressure of downstream piping and components. The loop directly controls pressure and advertently controls hydraulic flow rate.
Globe valve designs are generally preferred for pump recycle control due to their higher cavitation coefficient. Cavitation is an important factor to consider in the selection of control valves for this application. Response times should be moderately fast.