The importance of evaluating valve conditions and detecting the onset of possible
malfunctions is recognized as a key issue in control performance monitoring, as they may …

Control valves are very important actuators in the process industry. Due to friction in the
stem, they present a nonlinear behavior, which can generate errors in the stem position and …

A well-established compensation technique to remove oscillations caused by control valve
stiction is the two-moves method. However, the actual versions of this technique present …

Stiction nonlinearity in control valves has always attracted attention of researchers as it
induces limit cycles. In ratio control loops, the problem is further enhanced owing to the …

A novel model free stiction compensation scheme is developed which eliminates the
oscillations and also reduces valve movement, allowing good setpoint tracking and …

The controller and the control valve are the workhorses of the process industry. The
profitability, the reduction in energy consumption and raw material usage along with the …

Valve stiction is a hidden menace in process control loops. The presence of stiction in
control valves limits the control loop performance. Compensation of its effect is beneficial …

Control valves are important elements of control loops. Stiction in control valves limits the
performance of control loops. It decreases the life of control valves. Minimizing the negative …

The presence of friction in control valves produces limit cycles that reduces the performance
of control loops. Once friction is detected, its compensation avoids process stops until the …

Automatic control system is very common in modern industrial plants. The performance of
the control loop largely depends on the control valve. Stiction is a commonly found problem …