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空气过滤减压阀也叫调压阀，由空气过滤器、减压阀和油雾器组成，称为气动三大件，减压阀是其中不可缺少的一部分是将较高的进口压力调节并降低到要求的出口压力，并能保证出口压力稳定，即起到减压和稳压作用。气动减压阀按压力调节方式，有直动式减压阀和先导式减压阀，后者适用在较大通径的场合，直动式减压阀用的最多
压力为P1的压缩空气，由左端输入经阀口节流后，压力降为P2输出。P2的大小可由主调压弹簧进行调节。拉起并顺时针旋转主调压旋钮，主调压弹簧被压缩，推动膜片组合和调压柱下移，推动阀芯，增大阀口开度使P2增大。出口压力气体经反馈导管进入膜片室，在膜片组合上产生一个向上推力。当此推力与主调压弹簧力平衡时，出口压力便稳定在一定值。若反时针旋转主调压旋钮，阀口的开度减小，P2随之减小。
若进口压力不变，输出流量变化，使出口压力P2发生波动（增高或降低）时，依靠溢流孔的溢流作用和膜片组合上力的平衡作用推动调压柱8上下移动，仍能起到稳压作用
当输出流量为零时，出口压力经过反馈导管进入膜片室，推动膜片组合上移，调压柱在复位弹簧1的推动下上移，阀口关闭，保证出口压力恒定。当输出流量很大时，高速气流使反馈导管2处产生负压，吸出膜片室内的部分气体使膜片室压力下降，阀口开度加大，仍然可以保持膜片上的力平衡。
 

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