A valve is an electro-mechanical apparatus employed to regulate fluid/gas movement within a piping system. Valve symbols on P&IDs play a vital role by depicting the diverse valve types utilized for fluid or gas flow control. The Gauges, transmitters, local indicators, DCS indicators, interlocks and other functions have to be shown in detail on the P&ID. The interconnection between these elements must be specified using various types of instrument signals, including both analog and digital signals, to ensure accurate and reliable communication and control within the system.
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