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A knowledge-based system has been constructed to act as an assistant in the design of hydraulic valves. It has been constructed on a small system (PC). This is a research installation aimed at gaining an understanding of the processes involved in developing expert design systems. It appears that an industrial version of the system developed here would be a useful addition to a standard CAD system being used for valve design. Autocad is used as the Cad system with the knowledge-based assistant developed in Autolisp which is a dialect of Lisp. A valve spool design is discussed as an example.

The use of knowledge-based systems can aid an engineer or client in configuring a hydraulic valve for design or order placement. Such a system was developed for placing orders for one particular type of directional control valve from one particular company. The order developed was in terms of the manufacturer's code. Turbo Prolog was used for building the system. The system was built as an example of a tool for use in ordering this particular type of valve and also to evaluate the use of such a system as an element in a valve design system.