SRD991-CPND6ZZZNR-V01 定位传感器 福克斯波罗

阀门的作用原理
（1）用于对调节质量要求高的重要调节系统，以提高调节阀的定位及可靠性。
（2）用于阀门两端压差大（ △p>1MPa）的场合。通过提高气源压力执行机构的输出力，以克服液体对阀芯产生的不平衡力，减小行程误差。
（3）当被调介质为高温、高压、低温、有、易燃、易爆时，为了防止对外泄漏，往往将填料压得很紧，因此阀杆与填料间的摩擦力较大，此时用可克服时滞。
（4）被调介质为粘性流体或含有固体悬浮物时，用可以克服介质对阀杆的阻力。
（5）用于大口径（Dg>100mm）的调节阀，以执行机构的输出推力。
（6）当调节器与执行器距离在60m以上时，用可克服控制信号的传递滞后，改善阀门的动作反应速度。
（7）用来改善调节阀的流量特性。
（8）一个调节器控制两个执行器实行分程控制时，可用两个，分别接受低输入信号和高输入信号，则一个执行器低程动作，另一个高程动作，即构成了分程调节。
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