1 总则本方案适用于调节阀的检修方案。

　　This plan is applicable to the maintenance plan of regulating valves.

　　2 阀的结构特点2.1 阀的结构该调节阀由气动薄膜执行机构和直通单座阀两部分组成。主要包括膜片，膜室，支架，阀芯阀座，上阀盖，单座型的阀体，连接件，定位器等组成。2.2 阀的特点；阀内只有一个阀座，具有泄漏量小的优点，但不平衡力较大，所以阀的工作压差不易过高，适用于泄漏小，压差不大的干净介质场合。

　　The structural characteristics of the 2-valve 2.1 valve structure This regulating valve consists of a pneumatic diaphragm actuator and a straight through single seat valve. It mainly consists of diaphragm, diaphragm chamber, bracket, valve core and seat, upper valve cover, single seat valve body, connecting parts, locator, etc. 2.2 Characteristics of valves; There is only one valve seat inside the valve, which has the advantage of small leakage, but the unbalanced force is large, so the working pressure difference of the valve is not easy to be too high, suitable for clean medium occasions with small leakage and small pressure difference.

　　3 检修方法及标准3.1 检修方法3.1.1 按操作规程检查问题，方可拆检阀门。3.1.2 关掉气源，拆下定位器及气源管。3.1.3 执行机构部件检查；打开膜室取出膜片，观察是否有细小裂纹或橡胶与纤维层脱离，或有明显撕裂， 如有说明膜片已老化磨损，需更换新膜片， 在上下膜头盖与硬芯周边接触的膜片部位， 如发现有裂痕和硬伤也应更换。膜头输出推杆密封O型圈外观检查是否磨损，变脆如有更换，3.1.4 密封部件检修； 检查填料是否磨损， 如磨损应全部清理更换，检查金属波纹官是否破裂，如有更换。3.1.5 阀芯阀座的检修； 首先检查阀芯阀座的气蚀状况，和有没有明显磨痕， 如气蚀和磨痕深度小于 0.5mm是可用细砂纸研磨， 如气蚀和磨痕深度大于0.5mm是应上车床光刀后在研磨。3.1.6检查阀杆是否弯曲，如弯曲应在平台上校直。3.1.7?阀体的检修； 主要检查阀体内部冲蚀，腐蚀，气蚀，及机械损伤情况， 如严重需更换，里面有无焊渣，工艺填料等，如有需清理干净。

　　3 Maintenance Methods and Standards 3.1 Maintenance Methods 3.1.1 Check for problems according to the operating procedures before disassembling the valve for inspection. 3.1.2 Turn off the air source, remove the locator and air source pipe. 3.1.3 Inspection of actuator components; Open the membrane chamber and remove the membrane. Observe for any small cracks, detachment of rubber from the fiber layer, or obvious tearing. If so, it indicates that the membrane has aged and worn out, and needs to be replaced with a new one. If cracks or hard damage are found in the membrane area where the upper and lower membrane covers are in contact with the hard core, it should also be replaced. Inspect the appearance of the O-ring seal of the output push rod of the membrane head for wear and if it becomes brittle, replace it if necessary. 3.1.4 Repair the sealing components; Check if the packing is worn, and if worn, clean and replace it completely. Check if the metal bellows are broken, and replace it if necessary. 3.1.5 Maintenance of valve core and seat; Firstly, check the cavitation condition of the valve core and seat, and whether there are obvious wear marks. If the depth of cavitation and wear marks is less than 0.5mm, it can be ground with fine sandpaper. If the depth of cavitation and wear marks is greater than 0.5mm, it should be polished with a lathe knife before grinding. 3.1.6 Check if the valve stem is bent, and if it is bent, it should be straightened on the platform. 3.1.7? Maintenance of valve body; The main inspection is to examine the internal erosion, corrosion, cavitation, and mechanical damage of the valve body. If it is severe, it needs to be replaced. There should be no welding slag or process packing inside, and if so, it should be cleaned thoroughly.

　　4 检修后阀门的组装4.1 组装前应对阀门的全部元件进行一次清理检查，组装顺序应自上而下， 先组装阀体部分，再组装执行机构， 然后组装整阀， 膜头输出杆应与阀杆对中后再用连接件固定。加入的垫片应涂润滑脂，加入的填料要充实均匀.4.2 膜片与硬芯固定时螺丝帽处应加放松垫，膜片保证平整，防止串气。4.3 所有紧固螺栓和填料装配前都应涂上润滑脂，利于下次检修和润滑。

　　4. Assembly of valves after maintenance 4.1 Before assembly, all components of the valve should be cleaned and inspected. The assembly sequence should be from top to bottom, with the valve body part assembled first, followed by the actuator, and then the entire valve assembled. The diaphragm output rod should be aligned with the valve stem before being fixed with connectors. The added gasket should be coated with lubricating grease, and the added filler should be filled evenly. When fixing the diaphragm to the hard core, a relaxation pad should be added at the screw cap to ensure that the diaphragm is flat and prevent air leakage. 4.3 All fastening bolts and fillers should be coated with lubricating grease before assembly to facilitate next maintenance and lubrication.

　　5 阀门的调校阀门组装完毕后装上定位器，气源管进行调校。校准点不应少于 5 个点，0.?25% .50%. 75%. 100% 。依次缓慢地将各点信号输入定位器，观察行程指针与标尺刻度是否对应，否则应进行反复调整，直至达到标准。

　　After assembling the 5-valve calibration valve, install the locator and calibrate the air source pipe. The calibration points should not be less than 5 points, 0? 25% .50%.  75%. 100%. Slowly input the signals of each point into the locator in sequence, and observe whether the travel pointer corresponds to the scale scale. Otherwise, it should be repeatedly adjusted until it reaches the standard.

　　6 试压6.1 阀门调校标准后装到试压机上，试压合格后清理并油漆外观处理。6.2 检查检修后的记录档案资料是否齐全准确。

　　6 Pressure Test 6.1 After adjusting the valve according to the standard, install it on the pressure testing machine. After passing the pressure test, clean and paint the appearance. 6.2 Check whether the records and archives after maintenance are complete and accurate.

　　7 安全注意事项7.1 维修必须由两人以上作业。7.2 发现阀门出现异常需处理时，必须取得工艺人员认可，采取安全措施后方可作业。7.3 检修时，必须使用专用工具，不得损坏零部件。7.4 拆卸下来的零部件及裸露出来的阀体应用软材料盖好及抱起来，防止丢失， 损坏及掉入异物。

　　7 Safety precautions 7.1 Maintenance must be carried out by two or more people. When abnormalities are found in the valve and need to be dealt with, approval from the process personnel must be obtained, and safety measures must be taken before operation can begin. 7.3 During maintenance, specialized tools must be used and parts must not be damaged. 7.4 The disassembled parts and exposed valve bodies should be covered and lifted with soft materials to prevent loss, damage, and foreign objects from falling in.

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