Daily Question on Automation Theory Knowledge (7.28)

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This post was last edited by 18663069001 on 2017-7-28 07:11. Process and instrumentation are inseparable; to help everyone gain a better understanding of the basic concepts related to instruments, we have launched the \"One Question per Day\" campaign – just reply to get the answer. To encourage continued participation from everyone! You get 3 wealth rewards just for participating! I hope everyone will participate actively, learn together, and make progress together! ! ! True or False: 14. The accessories of a control valve include a handwheel, pneumatic relay, valve positioner, solenoid valve, valve position switch, valve position transmitter, air storage tank, pressure reducing filter, and other components. Is this statement correct? The answer to this question is: Yes. The following are the functions of some attachments: Valve positioners – including electrical valve positioners and pneumatic valve positioners – are used to improve the operating characteristics of control valves and ensure accurate positioning ； Valve position switch – displays the operating position of the adjustment for the upper and lower limits ； Pneumatic positioner – maintains the valve’s current position in the event of a air supply failure ； Three-way and four-way solenoid valves – for automatic switching of air circuits ； Handwheel mechanism – allows for manual operation in the event of a system failure ； Pneumatic relay – accelerates the operation of the actuator and reduces transmission time ； Air filter pressure reducing valve – used for purifying the air supply and regulating pressure; Air tank – when there is a problem with the air supply, it takes over so that the valve can continue to function for a while