1. Cleaning method

管路中的焊渣、鐵銹、渣子等在節(jié)流口、導(dǎo)向部位、下閥蓋平衡孔內(nèi)造成堵塞或卡住使閥芯曲面、導(dǎo)向面產(chǎn)生拉傷和劃痕、密封面上產(chǎn)生壓痕等。這經(jīng)常發(fā)生于新投運系統(tǒng)和大修后投運初期。這是更常見的故障。遇此情況，必須卸開進(jìn)行清洗，除掉渣物，如密封面受到損傷還應(yīng)研磨；同時將底塞打開，以沖掉從平衡孔掉入下閥蓋內(nèi)的渣物，并對管路進(jìn)行沖洗。投運前，讓調(diào)節(jié)閥全開，介質(zhì)流動一段時間后再納入正常運行。

Welding slag, rust and slag in the pipeline cause blockage or jamming in the orifice, guide part and balance hole of the lower bonnet, resulting in strain and scratch on the valve core surface and guide surface, indentation on the sealing surface, etc. This often occurs in the initial stage of new operation system and operation after overhaul. This is the most common fault. In this case, it must be removed for cleaning and slag removal. If the sealing surface is damaged, it shall also be ground; At the same time, open the bottom plug to flush the slag falling into the lower valve cover from the balance hole and flush the pipeline. Before putting into operation, fully open the regulating valve and bring the medium into normal operation after flowing for a period of time.

2、外接沖刷法

2. External scouring method

對一些易沉淀、含有固體顆粒的介質(zhì)采用普通閥調(diào)節(jié)時，經(jīng)常在節(jié)流口、導(dǎo)向處堵塞，可在下閥蓋底塞處外接沖刷氣體和蒸汽。當(dāng)閥產(chǎn)生堵塞或卡住時，打開外接的氣體或蒸氣閥門，即可在不動調(diào)節(jié)閥的情況下完成沖洗工作，使閥正常運行。

When ordinary valves are used to regulate some media that are easy to precipitate and contain solid particles, they are often blocked at the throttle and guide, and scouring gas and steam can be connected outside 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 and make the valve operate normally.

3、安裝管道過濾器法

3. Installation of pipeline filter

對小口徑的調(diào)節(jié)閥，尤其是超小流量調(diào)節(jié)閥，其節(jié)流間隙特小，介質(zhì)中不能有一點點渣物。遇此情況堵塞，在閥前管道上安裝一個過濾器更好，以保證介質(zhì)順利通過。帶定位器使用的調(diào)節(jié)閥，定位器工作不正常，其氣路節(jié)流口堵塞是常見的故障。因此，帶定位器工作時，處理好氣源，通常采用的辦法是在定位器前氣源管線上安裝空氣過濾減壓閥

For small-diameter regulating valves, especially ultra-small flow regulating valves, the throttling clearance is very small, and there can be no little 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. For the regulating valve with positioner, the positioner does not work normally, and the blockage of its gas path throttle is a common fault. Therefore, when working with the positioner, the common way to deal with the air source is to install an air filtration pressure reducing valve on the air source pipeline in front of the positioner

4、加大節(jié)流間隙法

4. Method of increasing throttling clearance

如介質(zhì)中的固體顆?；蚬艿乐斜粵_刷掉的焊渣和銹物等因過不了節(jié)流口造成堵塞、卡住等故障，可改用節(jié)流間隙大的節(jié)流件—節(jié)流面積為開窗、開口類的閥芯、套筒，因其節(jié)流面積集中而不是圓周分布的，故障就能很容易地被排除。如果是單、雙座閥就可將柱塞形閥芯改為“V”形口的閥芯，或改成套筒閥等。例如某化工廠有一臺雙座閥經(jīng)?？ㄗ?，推薦改用套筒閥后，問題馬上得到解決。

For example, the solid particles in the medium or the washed out welding slag and rust in the pipeline can not pass through the orifice, resulting in blockage, jamming and other faults. The throttling parts with large throttling clearance can be used - valve cores and sleeves with window and opening throttling area. Because the throttling area is concentrated rather than circular distribution, the fault can be easily eliminated. If it is a single or double seat valve, the plunger valve core can be changed into a valve core with "V" port, or into a sleeve valve, etc. For example, a two seat valve in a chemical plant is often stuck. It is recommended to use sleeve valve, and the problem will be solved immediately.

5、介質(zhì)沖刷法

5. Medium scouring method

利用介質(zhì)自身的沖刷，沖刷和帶走易沉淀、易堵塞的東西，從而提高閥的防堵功能。常見的方法有：①改作流閉型使用；②采用流線型閥體；③將節(jié)流口置于沖刷厲害處，采用此法要注意提高節(jié)流件材料的耐沖蝕能力。

Use the scouring of the medium itself to scour and take away things that are easy to precipitate and block, so as to improve the anti blocking function of the valve. The common methods are: ① change to flow closed type; ② Adopt streamlined valve body; ③ Place the throttling port at the place with severe scouring, and pay attention to improving the erosion resistance of throttling material.

6、直通改為角形法

6. Straight through to angular method

直通為倒S流動，流路復(fù)雜，上、下容腔死區(qū)多，為介質(zhì)的沉淀提供了地方。角形連接，介質(zhì)猶如流過90℃彎頭，沖刷性能好，死區(qū)小，易設(shè)計成流線形。因此，使用直通的調(diào)節(jié)閥產(chǎn)生輕微堵塞時可改成角形閥使用。

The direct flow is inverted s flow, the flow path is complex, and there are many dead zones in the upper and lower cavities, which provides a place for medium precipitation. Angular connection, the medium is like flowing through a 90 ℃ elbow, with good scouring performance and small dead zone, which is easy to be designed into a flow line. Therefore, the use of straight through control valve can be changed to angle valve when it is slightly blocked.

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