It has been nearly a decade since the Instrumentation, Systems and Automation Society (ISA) introduced S88, its first standard for batch control systems. Its still integral in optimizing operations today.
Install a flow meter in the recycle, cascade the flow set point with a pressure control loop. With proper tuning, the valve characteristics are lost in the flow control loop, which should be tuned fast with PI.
Radio-frequency identification (RFID) technology, writes Agnes Shanley, is not only being evaluated or implemented by more companies for supply-chain management and security, it lets companies spy on employees or customers.