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VICKERS液控单向阀所用的调压气体，是由小型的直动式减压阀供给的。若把小型直动式减压阀装在阀体内部，则称为内部先导式减压阀；若将小型直动式减压阀装在主阀体外部，则称为外部先导式减压阀。 图14—2所示为内部先导式减压阀的结构图，与直动式减压阀相比，该阀增加了由喷嘴4、挡板3、固定节流孔9及气室B所组成的喷嘴挡板放大环节。当喷嘴与挡板之间的距离发生微小变化时，就会使B室中的压力发生根明显的变化，从而引起膜片10有较大的位移，去控制阀芯6的上下移动，使进气阀口8开大或关小、提高了对阀芯控制的灵敏度，即提高了稳压精度。200X减压阀，是一种利用介质自身能量来调节与控制管路压力的智能型阀门。用于生活给水、消防给水及其他工业给水系统,通过调节阀减压导阀,即可调节主阀的出口压力。出口压力不因进口压力、进口流量的变化而变化，安全可靠地将出口压力维持在设定植上，并可根据需要调节设定值达到减压的目的。该阀减压精确，性能稳定、安全可靠、安装调节方便，使用寿命长。减压阀主要控制主阀的固定出口压力，主阀出口压力不因进口压力变化而改变，并不因主阀出口流量的变化而改变其出口压力。
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