F. Greg Shinskey, process control consultant

The Three Faces of Control Valves

Flow control by nature is quite forgiving, principally by being very fast and self-regulating. Self-regulation means the controlled variable reaches a steady state following any change in the position of the valve or the plant load with the controller in manual. And because its response is complete within a few seconds, flow is very easy to control manually, making it easy to control auto...