Design of Pressure Transient Control System

The successful implementation of valve stroking methods to reduce pressure surge in a pipe flow system ultimately depends upon the quality of the mechanism controlling the valve. The writer describes a fast response electrohydraulic servo system operating on a closed-loop feedback control principle. A theoretical model of the control system is formulated which, when linked to an existing model of the fluid dynamics, enables the performance and stability of the closed-loop system to be investigated. These theoretical results are compared with those obtained when the mechanism attempts to implement two-valve stroking methods proposed by the writer. The comparison indicates that the theoretical model reasonably predicts the actual response and that the mechanism itself performs the function for which it was designed.