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The control valve is an important component of the valve positioner, and it plays a significant role when the positioner is in use. So, after using the control valve, how should we carry out its maintenance? The following will introduce it to you. Maintenance of valve positioners and control valves: There are three typical methods for maintaining control valves: predictive maintenance ； Passive maintenance ； Preventive maintenance. Preventive maintenance: To prevent accidents related to control valves, it is necessary to schedule regular inspections or maintenance for certain control valves based on past production experience. Although it helps to prevent some accidents involving control valves, the scheduling process inevitably results in some control valves that are functioning properly still being included in the maintenance schedule, due to the lack of extensive information on the control valves in use on site. Passive maintenance: During operation, failures in certain accessories of the control valve or issues with the valve itself can prevent it from functioning properly; in more severe cases, this can lead to the entire system failing to operate correctly, resulting in serious accidents. Therefore, when a control valve fails, it should be repaired. Preventive maintenance: The multimeter has all the functions required for recalibrating and performing on-site inspections of electronic valve positioners. The definition of gas consumption for valve positioners and control valves is: the maximum flow rate of gas consumed by the instrument within its operating range when the gas consumption is at a steady state. Therefore, the complete expression for gas consumption is related to expressions such as flow rate, output opening, and supply pressure. Above, we have introduced the maintenance of control valves along with the indication of air consumption for valve positioners. Everyone can carry out maintenance following our methods, and it won’t disappoint you.