PID图中调节阀旁标注FL(O) 和FL(C) 是什么意思啊！～？ fail locked spring to close/open (flsc/flso) these terms are used to identify which side of the diaphragm actuator the spring is to be mounted. in real terms the pneumatic hook-up design should include a pneumatic relay set at a value that is considered to be an ‘instrument air’ failure (say 0.3mpag). the effect of an air failure will be to lock the air in the actuator thereby trapping the control valve in its position at the time of the air failure. over time the air will leak away form the actuator and under these circumstances the spring inside the actuator should tend to close (or open) as identified by flsc (or flso). 失气保位弹簧的关/开 这些东西是用来确定弹簧安装在薄膜执行机构的哪个方向。在实际情况中，气动连接设计应该包括一个气动继电器，其值设定在“仪表风故障值”（例如 0.3mpag）。气体故障就会导致气体被锁定在执行机构内，从而在故障时锁定控制阀的位置。随着时间推移，执行器内空气会泄露，在这种环境下，执行器内的弹簧将会按照flsc(或flso)趋于关闭（或开）查看更多
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