As far as we know, the industry valve is a device installed in the industry piping systems to do the work of flow control. The valves can start, stop, mix, control, or regulate the flow or pressure of the fluid by modifying the passage through the piping, it is an essential part of any piping system conveying liquids, vapors, slurries, gases, and mixtures of liquid, and gaseous phases of various flow media.

Depend on various needs of the industry systems, the valves are designed to perform different function to achieve the purpose of piping control. The common functions of valves are listed in follows, and there are many valve designs and types that satisfy one or more of the functions identified: