One Question per Day: Methanol Technology Exchange Edition 20180510

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Learn from the advanced practices of the *Brothers section; there are prizes for correct answers – any answer earns a reward, allowing us to grow and mature through these Q&A sessions. Brief answer: Self-acting control valve. A self-acting control valve, also known as a directly acting control valve, is a type of control valve that does not require any external power source. It integrates the functions of measurement, regulation, and actuation into one unit, utilizing the energy from the process itself to drive its operation. It is suitable for situations where there are small variations in flow rate, low requirements for regulation accuracy, or difficulties in obtaining instrument air supply. Based on their application, self-acting control valves can be classified into: pressure control valves, differential pressure control valves, level control valves, temperature control valves, and flow control valves.