Valves are devices used to control the flow of a fluid stream. There are different kinds of valves used in plants based on the needs. Basically, Valves can be grouped into two main types: Shut off valves: They are ON/OFF valves either allow full flow or shut off completely. Shut off valves can be operated by hand or automatically. They are not used for controlling the flow. eg: Gate valves Control valves: These valves act as the correcting element of a control loop. Control valves are normally operated automatically, there are also hand operated valves. There are many types control valves eg: Globe valves, Butterfly valves, Ball and Plug valves, Pinch valves, Needle valves, Check valves,
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