1.清洗法

1. Cleaning method

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。

Welding slag, rust, slag, etc. in the pipeline cause blockage or jamming in the throttle opening, guide part, and balance hole of the lower valve cover, resulting in scratches and strains on the valve core surface and guide surface, as well as pressure marks on the sealing surface. This often occurs in the early stages of new systems being put into operation and after major repairs. This is the most common malfunction. In this case, it must be removed for cleaning, removing debris. If the sealing surface is damaged, it should also be ground; At the same time, open the bottom plug to flush out any debris that falls into the lower valve cover from the balance hole, and flush the pipeline. Before putting into operation, fully open the regulating valve and allow the medium to flow for a period of time before it can be put into normal operation.

2.外接冲刷法

2. External flushing method

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。

When using ordinary valves to regulate media that are prone to sedimentation and contain solid particles, they often block the throttle and guide ports. Gas and steam can be externally flushed at 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 regulating valve, so that the valve can operate normally.

3.安装管道过滤器法

3. Installation of pipeline filter method

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，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

For small caliber control valves, especially ultra small flow control valves, their throttling clearance is particularly small, and there should be no residue in the medium. In case of blockage, it is best to install a filter on the pipeline in front of the valve to ensure smooth passage of the medium. The most common malfunction of a regulating valve with a locator is that the locator is not working properly, and the throttle port of the pneumatic circuit is blocked. Therefore, when working with a locator, it is necessary to handle the air source well. The usual method is to install an air filter pressure reducing valve on the air source pipeline in front of the locator

4.增大节流间隙法

4. Increase the throttle clearance method

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，改用套筒阀后，问题马上得到。

If solid particles in the medium or welding slag and rust that have been washed away in the pipeline cannot pass through the throttling port, causing blockage, jamming and other faults, throttling components with large throttling gaps can be used - valve cores and sleeves with window or opening throttling areas. Due to their concentrated throttling area rather than circumferential distribution, faults can be easily eliminated. If it is a single or double seat valve, the plunger shaped valve core can be changed to a V-shaped valve core, or to a sleeve valve, etc. For example, in a chemical plant, a double seat valve often gets stuck. It is recommended to use a sleeve valve, and the problem is immediately solved.

5.介质冲刷法

5. Medium erosion method

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将节流口置于冲刷厉害处，采用此法要注意提高节流件材料的耐冲蚀能力。

By utilizing the flushing energy of the medium itself, it can flush and remove easily precipitated and clogged substances, thereby improving the anti clogging function of the valve. Common methods include: ① switching to a flow closed type for use; ② Adopting a streamlined valve body; ③ Place the throttling port at the point where the erosion is most severe. When using this method, attention should be paid to improving the erosion resistance of the throttling component material.

6.直通改为角形法

6. Change from straight to angular method

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。

The direct flow is an inverted S flow, with a complex flow path and multiple dead zones in the upper and lower chambers, providing a place for the precipitation of the medium. Angular connection, the medium flows like a 90 ℃ elbow, with good flushing performance, small dead zone, and easy to design into a streamlined shape. Therefore, when using a through regulating valve that causes slight blockage, it can be changed to an angle valve for use.