调节阀经常卡住或堵塞的处理方法
How to deal with the frequent jam or blockage of the control valve
1.清洗法
管路中的焊渣、铁锈、渣子等在节流口、导向部位、下阀盖平衡孔内造成堵塞或卡住使阀芯曲面、导向面产生拉伤和划痕、密封面上产生压痕等。这经常发生于新投运系统和大修后投运初期。这是比较常见的故障。遇此情况，必须卸开进行清洗，除掉渣物，如密封面受到损伤还应研磨；同时将底塞打开，以冲掉从平衡孔掉入下阀盖内的渣物，并对管路进行冲洗。投运前，让调节阀全开，介质流动一段时间后再纳入正常运行。
1. Cleaning method
The welding slag, rust and slag in the pipeline cause blockage or jamming in the throttle port, guide part and balance hole of the lower valve cover, resulting in tensile and scratch on the surface of valve core and guide surface, and indentation on the sealing surface. This often occurs in the new commissioning system and in the early stage after overhaul. This is the most common fault. In this case, it is necessary to remove the slag and remove the slag. If the sealing surface is damaged, it should also be ground; at the same time, the bottom plug should be opened to flush out the slag falling into the lower valve cover from the balance hole, and the pipeline should be flushed. Before putting into operation, the control valve should be fully opened and the medium should flow for a period of time before normal operation.
2.外接冲刷法
对一些易沉淀、含有固体颗粒的介质采用普通阀调节时，经常在节流口、导向处堵塞，可在下阀盖底塞处外接冲刷气体和蒸汽。当阀产生堵塞或卡住时，打开外接的气体或蒸气阀门，即可在不动调节阀的情况下完成冲洗工作，使阀正常运行。
2. External flushing method
When the ordinary valve is used to regulate the medium which is easy to precipitate and contains solid particles, it is often blocked at the orifice and the guide, and the flushing gas and steam can be connected to the bottom plug of the lower valve cover. When the valve is blocked or stuck, open the external gas or steam valve to complete the flushing work without moving the control valve, so that the valve can operate normally.
3.安装管道过滤器法
对小口径的调节阀，尤其是超小流量调节阀，其节流间隙特小，介质中不能有一点点渣物。遇此情况堵塞，比较好在阀前管道上安装一个过滤器，以保证介质顺利通过。带定位器使用的调节阀，定位器工作不正常，其气路节流口堵塞是比较常见的故障。因此，带定位器工作时，必须处理好气源，通常采用的办法是在定位器前气源管线上安装空气过滤减压阀
3. Installation of pipeline filter
For small diameter control valves, especially for ultra-small flow control valves, the throttling clearance is very small, and there is no slag in the medium. In case of blockage, it is better to install a filter on the pipeline in front of the valve to ensure the smooth passage of the medium. The most common fault of the control valve with positioner is that the positioner works abnormally. Therefore, when the positioner works, the air source must be handled well. The usual method is to install the air filter pressure reducing valve on the air source pipeline in front of the positioner
4.增大节流间隙法
如介质中的固体颗粒或管道中被冲刷掉的焊渣和锈物等因过不了节流口造成堵塞、卡住等故障，可改用节流间隙大的节流件—节流面积为开窗、开口类的阀芯、套筒，因其节流面积集中而不是圆周分布的，故障就能很容易地被排除。如果是单、双座阀就可将柱塞形阀芯改为“V”形口的阀芯，或改成套筒阀等。例如某化工厂有一台双座阀经常卡住，推荐改用套筒阀后，问题马上得到解决。
4. Increase throttle clearance
If the solid particles in the medium or the welding slag and rust which are washed out in the pipeline can not pass through the throttling orifice and cause blockage and jamming, the throttling parts with large throttling clearance can be used instead of the valve core and sleeve with large throttling clearance. The fault can be easily eliminated because the throttling area is concentrated rather than distributed in a circle. If it is a single seat or double seat valve, the plunger valve core can be changed into the valve core with "V" shaped port or sleeve valve. For example, a double seat valve is often stuck in a chemical plant. After the sleeve valve is recommended, the problem is solved immediately.
5.介质冲刷法
利用介质自身的冲刷能量，冲刷和带走易沉淀、易堵塞的东西，从而提高阀的防堵功能。常见的方法有：①改作流闭型使用；②采用流线型阀体；③将节流口置于冲刷比较厉害处，采用此法要注意提高节流件材料的耐冲蚀能力。
5. Medium erosion method
By using the scouring energy of the medium itself, it can wash and take away the things that are easy to precipitate and block, so as to improve the anti blocking function of the valve. The common methods are as follows: ① changing to flow closed type; ② adopting streamline valve body; ③ placing the throttle at the place with the most severe scour; using this method, attention should be paid to improving the erosion resistance of throttle materials.
6.直通改为角形法
直通为倒S流动，流路复杂，上、下容腔死区多，为介质的沉淀提供了地方。角形连接，介质犹如流过90℃弯头，冲刷性能好，死区小，易设计成流线形。因此，使用直通的调节阀产生轻微堵塞时可改成角形阀使用。
6. Change the straight through method to the angle method
The direct flow is inverted-s flow, the flow path is complex, and there are many dead zones in the upper and lower chambers, which provides a place for the precipitation of the medium. Angular connection, medium as if flowing through 90 ℃ elbow, good erosion performance, small dead zone, easy to design into flow line. Therefore, the use of straight through regulating valve can be changed into angle valve when slight blockage occurs.
