控制阀性能检测与维修保养

译文：
一、控制阀的选择问题： 更多阀门选型知识请点击进入：阀门选型专题。 目前，工程中普遍使用的控制阀主要是：电磁阀和电动阀。但在使用中它们均有缺陷，如电磁阀易被异物堵塞、水阻大，须长期专人维护等；而电动阀虽然无水阻，但由于需有必要的控制电路，所以，防水汽侵蚀影响使用寿命也是困扰推广的主要问题。 二、如何解决控制阀性能差的问题 无论是电磁阀还是电动阀，水垢不但会造成阀门泄漏，严重时甚至会影响阀门的正常工作，所以如何消除水垢的影响，已是业内人士普遍关注的问题。 控制阀的工艺要涉及的范围实在太广,不能在这里一一给你说清楚,有关这方面的内容还的自己亲自去查资料了。不过由于设计执行机构和使用填充材料不同造成控制阀性能差还是可以总结出其规律的: 1、工艺过程里死区的存在会使过程变量偏离原设定点。所以控制器的输出必须增大到足于克服死区,只有这一纠正性的动作才会发生。 2、 ①影响死区的主要因素。摩擦力、游移、阀轴扭转、放大器的死区。各种控制阀对摩擦里敏感是不一样的,比如旋转阀对于由高的阀座负载引起的摩擦力就非常敏感,故使用时注意到这一点。但是对于有些密封型式,高的阀座负载是为了获得关闭等级所必须的。哈哈,这样,这种阀设计出来就非常差,容易引起很大的死区,这对过程偏差度的影响是显而易见的,简直是决定性的。 ②磨损。阀门在正常使用时出现磨损是在所难免的,但是润滑层的磨损是最厉害的的,根据我们实验证实,润滑旋转阀只经过几百次循环动作,润滑层差不多可以刚刷子使用(夸张点,不然写文章很郁闷)。另外压力引起的负载也会导致密封层的磨损,这些都是导致摩擦力增加主要因素。结果呢?就是给控制阀的性能于毁灭性! ③、填料摩擦力是控制阀摩擦力的主要来源,使用的填料不同,造成的摩擦力有很大的差别。 ④,执行机构的类型不同也对摩擦力有根本性的影响,一般来说弹簧薄膜执行机构比活塞执行机构好。 3、定位器的设计问题。 从设计的最初思维着想,执行机构与定位器设计必须一起考虑的。怎么来设计一个好的定位器呢?从他的重要特性就知道,必须是个高增益装置。其增益是由两部分组成的:静态增益和动态增益。提高静态增益的方法是设计一个前置放大器。例如喷嘴--挡板装置。那么有朋友要问动态增益怎么获得?是通过一个动力放大器获得的,这个动力放大器是滑阀(一般)。现在有人已经利用微处理器来设置定位器了。看样子阀门以后还会说话告诉咱们他哪里坏了。那时侯做维修的就简单了。言归正传。同时具有高静态和高动态增益的高性能定位器能为任何一个给定的阀门组件提供降低过程偏差度方面的最佳总体性能。

“ Control valve performance testing and maintenance ”是由中国控制阀网提供的国际阀门新闻，译文仅供参考。另外，中国控制阀网还提供相关产品搜索：控制阀型号、控制阀价格、控制阀技术、控制阀新闻、控制阀生产商等。

原文：
First, the selection of control valves: Click for more knowledge into the valve selection: Selection of special valves. At present, the project control valves commonly used in the main are: solenoid valve and electric valve. However, they have defects in use, such as solenoid valves susceptible to blockage, water resistance big hand to long-term maintenance; and water resistance electric valve though, but the need for the necessary control circuit, so500X Pressure Discharge & Sustain Valve the corrosive influence of water vapor life is troubled by the promotion of the main problems. Second, how to solve the problem of poor control valve performance Whether or electric solenoid valve, the scale will not only result in valve leakage, severe and even affect the normal operation of the valve, so how to eliminate the scale effect, is the industry issues of common concern. Process control valve to the scope is too broad, not all of them here to give you clear, the content of this field is also of their personal information to check up. However, as the design and use of the implementing agencies of different filling materials or poor performance caused by control valve can be concluded from the law: 1 dead process in the presence of process variables will deviate from the original set point. So the controller's output must be increased enough to overcome the dead zone to only the corrective action will occur. 2 ① the main factors affect the700X Pump Control Valve dead zone. Friction, wander, the valve shaft to reverse, the amplifier's dead. Friction in a variety of control valves is not the same sensitive, such as rotary valve seat for high load caused by the friction is very sensitive, so use note. But for some seal types, high seat load is to be shut down rating requires. Haha, so that out of this valve design is very poor, easily aroused great dead, and this degree of deviation of the process is clear, simply be decisive. ② wear. Valves when in normal use and wear is inevitable, but the wear of lubricating layer is the most powerful, and according to our experiments demonstrated that lubricating rotary valve action only a few hundred cycles, lubricating layer can almost use just brush (an exaggeration point, or writing articles very depressed). Another load can lead to stress-induced seal wear layer, these are the main factors leading to increased friction. The result? Is to control valve performance in the devastating! ③, fill control valve friction is the main source of friction, the use of filler, resulting in very different friction. ④, different types of implementing agencies also have a fundamental influence on the friction, in general, the implementation agency springs film better than the piston actuator. 3, positioning of the design issues. The sake of the initial thinking from the design, implementation agencies and locator design must be considered together. How to design a good locator it? Important features 900X Emergent-Closing Valveof his know, must be a high-gain devices. The gain is composed of two parts: the static gain and dynamic gain. Improve the static gain is to design a preamplifier. Such as nozzle - baffle device. Then there are friends to ask how was the dynamic gain? Is obtained through a power amplifier, the power amplifier is a slide valve (General). Now, some people have used a microprocessor to set the locator. It looks after the valve to tell we will say where he was broken. Hou then do the maintenance is easy. Get down to business. Both high static and high dynamic-gain, high-performance positioning device for any given process valve components to provide lower degree of deviation of best overall performance.