P&ID diagrams, as previously said, are created using specified and standard shapes and symbols. Various symbols are required because this diagram covers many diagrams due to the wide diversity of businesses. These diagrams serve as a road map for the engineering system's design, which is later useful in identifying and solving problems. Actuators, equipment, flow elements, instrumentation, piping fittings, valves, and other instruments are among the most popular. In the engineering design, valves are used to control flow. Actuators and Self-Regulated Relief Valves are the two types of relief valves.