제어밸브(Control Valve)동작에서 Fail Safe기능을 설명하고, 정동작(Direct Action)과역동작(Reverse Action)에 대하여 설명하시오. https://sec-9070.tistory.com/586 dokumen.tips_basic-operation-and-function-of-control-valves다운로드 actutator_bench_set다운로드 https://control.com/textbook/control-valves/actuator-bench-set/ https://www.spiraxsarco.com/learn-about-steam/control-hardware-electric-pneumatic-actuation/control-valve-actuators-and-positioners?sc_lang=en-GB
