节流阀(Choke valve)的外形结构与截止阀并无区别，只是它们启闭件的形状有所不同。节流阀的启闭件大多为圆锥流线型，通过它改变通道截面积而达到调节流量和压力。节流阀供在压力降极大的情况下作降低介质压力之用。 src=https://www.zgznh.com/fangan/portant; padding-bottom: 0px; margin: 0px; padding-left: 0px; width: auto !important; padding-right: 0px; word-wrap: break-word !important; height: auto !important; visibility: visible !important; padding-top: 0px src=http://mmbiz.qpic.cn/mmbiz/vSABwyURAVht6AK4yjl9ZSVhWbrjicupJibtLuqaGRK2MNuNFjTGbOj1Y8bH9jAcJdctYjCDT1QveiawMibHMxsXZw/0?wxfrom=5 _width=auto data-src=http://mmbiz.qpic.cn/mmbiz/vSABwyURAVht6AK4yjl9ZSVhWbrjicupJibtLuqaGRK2MNuNFjTGbOj1Y8bH9jAcJdctYjCDT1QveiawMibHMxsXZw/0 data-w=319 data-ratio=0.7429467084639498 data-type=gif alt= /> src=https://www.zgznh.com/fangan/portant; padding-bottom: 0px; margin: 0px; padding-left: 0px; width: auto !important; padding-right: 0px; word-wrap: break-word !important; height: auto !important; visibility: visible !important; padding-top: 0px src=http://mmbiz.qpic.cn/mmbiz/vSABwyURAVht6AK4yjl9ZSVhWbrjicupJgTL394bAicVBeicRpgHW5HW8LzgpP81gNAYlcuPMDBxuWu9szBp5XkmQ/0?wxfrom=5 _width=auto data-src=http://mmbiz.qpic.cn/mmbiz/vSABwyURAVht6AK4yjl9ZSVhWbrjicupJgTL394bAicVBeicRpgHW5HW8LzgpP81gNAYlcuPMDBxuWu9szBp5XkmQ/0 data-w=319 data-ratio=0.7429467084639498 data-type=gif alt= /> portant; padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; max-width: 100%; word-wrap: break-word !important; padding-top: 0px /> portant; padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; max-width: 100%; word-wrap: break-word !important; color: rgb(255,0,0); font-size: 18px; padding-top: 0px>portant; padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; max-width: 100%; word-wrap: break-word !important; padding-top: 0px>性能特点： portant; padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; max-width: 100%; word-wrap: break-word !important; padding-top: 0px /> 1、构造较简单，便于制造和维修，成本低。 2、调节精度不高，不能作调节使用。 3、密封面易冲蚀，不能作切断介质用。 4、密封性较差。
