阀门定位器改善阀的稳态特性

 关键字：阀门定位器       http://www.azbil-china.com/

阀门定位器一个很大的作用就是能够改善阀的稳态特性，也就是改变了原来阀的一阶滞后特性，减小时间常数，使之成为比例特性。一般说来，如气压传送管线超过60m时，应采用阀门定位器。

　　一旦采用阀门定位器改善阀的稳态特性，只要控制器输出信号稍有变化，经过喷嘴一挡板系统及放大器的作用，就可使通往控制阀膜头的气压大有变动，以克服阀杆的摩擦和消除控制阀不平衡力的影响，从而保证阀门位置按控制器发出的信号正确定位。 　　经过阀门定位器改善阀的稳态特性后，能使控制阀适用于下列情况： 　　①要求阀位作调整的场合； 　　②大口径、高压差等不平衡力较大的场合； 　　③工艺介质中有固体颗粒被卡住，或是高黏滞的情况； 　　④为防止泄漏而需要将填料函压得很紧，例如高压、高温或低温等场合。德科蒙过程控制(武汉)有限公司座机:027-88062221传真:027-88068180邮箱:   sales@whdkm.com原文出处：http://www.azbil-china.com/a/XWZX/313.htmlABSolute;top:0;border:0;width:undefinedpx;height:undefinedpx;" SANdbox="allow-forms allow-popUPS allow-popups-to-escape-sandbox allow-same-origin allow-scripts allow-top-navigation-by-user-activation" frameborder="0" src="https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-6745515041074118&ouTPUt=html&adk=1812271804&adf=3279755396&plat=1%3A32776%2C2%3A32776%2C9%3A32776%2C10%3A32%2C11%3A32%2C16%3A8388608%2C17%3A32%2C24%3A32%2C25%3A32%2C30%3A1081344%2C32%3A32%2C40%3A32&guci=2.2.0.0.2.2.0.0&format=0x0&url=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fact%3D1&ea=0&flash=32.0.0&pra=5&wgl=1&tt_state=W3siaXNzdWVyT3JpZ2luIjoiaHR0cHM6Ly9hZHNlcnZpY2UuZ29vZ2xlLmNvbSISInN0YXRlIjowfSx7Imlzc3Vlck9yaWdpbiI6Imh0dHBzOi8vYXR0ZXN0YXRpb24uYW5kcm9pZC5jb20iLCJzdGF0ZSI6MH1d&dt=1604043517324&bpp=12&bdt=92&idt=156&shv=r20201027&cbv=r20190131&ptt=9&saldr=aa&cookie=ID%3D5fb7eae809183df8-22fd78660ec40024%3AT%3D1602660717%3ART%3D1602660717%3AS%3DALNI_MYMQQp2TnvCbvJQtTRQsdNX_-71Bg&nras=1&correlator=2424965250757&frm=23&ife=1&pv=2&ga_vid=343438589.1604043518&ga_sid=1604043518&ga_hid=621137611&ga_fc=0&iag=3&icsg=138&nhd=1&dssz=5&mdo=0&mso=0&u_tz=480&u_his=6&u_java=0&u_h=1080&u_w=1920&u_ah=1030&u_aw=1920&u_cd=24&u_nplug=17&u_nmime=34&adx=-12245933&ady=-12245933&biw=1243&bih=605&isw=730&ish=360&ifk=2699508910&scr_x=0&scr_y=0&eid=42530671%2C21068083%2C21066705&oid=3&pvsid=537804734187041&pem=16&ref=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fadd_suc%3D1&rx=0&eae=2&fc=1664&brdim=0%2C0%2C0%2C0%2C1920%2C0%2C1920%2C1030%2C730%2C360&vis=1&rsz=%7C%7Cs%7C&abl=NS&fu=8204&bc=31&ifi=0&uci=0.cbmvv7c233tz&fsb=1&dtd=192" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no" allowfullscreen="true" data-google-container-id="0.cbmvv7c233tz" data-load-complete="true">