二、尺寸测量：精准匹配是关键

　　2、 Size measurement: Accurate matching is key

　　阀门尺寸精度决定其能否与管道适配。用卡尺、千分尺等工具测量公称通径、阀杆直径等关键尺寸，偏差需控制在极小范围。法兰连接阀门的法兰外径、螺栓孔距等必须精准，否则安装后易泄漏；螺纹连接阀门的螺纹规格也要与管道完全匹配。此外，阀门结构长度关乎安装布局与系统应力，需严格按标准执行。

　　The accuracy of valve size determines whether it can be adapted to the pipeline. Use tools such as calipers and micrometers to measure critical dimensions such as nominal diameter and valve stem diameter, with deviations controlled within a very small range. The flange outer diameter and bolt hole spacing of flange connected valves must be precise, otherwise they are prone to leakage after installation; The thread specifications of the threaded connection valve should also be perfectly matched with the pipeline. In addition, the length of the valve structure is related to installation layout and system stress, and must be strictly implemented according to standards.

　　三、材质核验：“内在实力” 定乾坤

　　3、 Material verification: 'Inner strength' determines the universe

　　材质是阀门性能的核心。阀体、阀杆等关键部位材质必须符合设计与标准，铸铁阀成本低但耐腐蚀弱，不锈钢阀则适用于化工等场景。合金钢阀门需逐件光谱分析，确保合金成分达标；特殊行业还要关注材质洁净度，避免污染介质。

　　Material is the core of valve performance. The materials of key parts such as valve body and valve stem must meet the design and standards. Cast iron valves have low cost but weak corrosion resistance, while stainless steel valves are suitable for chemical and other scenarios. Alloy steel valves require individual spectral analysis to ensure that the alloy composition meets the standard; Special industries also need to pay attention to material cleanliness and avoid contaminating media.

　　四、压力测试：严苛考验测真金

　　4、 Stress Test: Rigorous Test Testing Real Gold

　　压力测试是验收 “重头戏”，包括壳体强度试验与密封性能试验。壳体强度试验以 1.5 倍公称压力施压，保压 5 分钟，观察阀体有无渗漏、变形；密封性能试验用 1.1 倍公称压力，截断阀要求内漏为零，其他阀门严控外漏，尤其对输送危险介质的阀门，外漏绝不可容忍。

　　Pressure testing is the key to acceptance, including shell strength testing and sealing performance testing. Shell strength test: Apply pressure at 1.5 times the nominal pressure and hold for 5 minutes to observe for any leakage or deformation in the valve body; The sealing performance test uses 1.1 times the nominal pressure, and the cut-off valve requires zero internal leakage. Other valves must strictly control external leakage, especially for valves that transport hazardous media. External leakage must not be tolerated.

　　五、操作性能测试：灵活顺畅保运行

　　5、 Operational performance testing: flexible and smooth operation to ensure smooth operation

　　手动阀门操作应轻便灵活，开闭无卡阻；电动、气动阀门的驱动装置需运转平稳，控制灵敏，开关时间符合设计要求，确保紧急情况下能及时响应。同时，阀门应具备准确的行程限位，防止阀瓣过度启闭损坏部件。

　　Manual valve operation should be light and flexible, with no obstruction in opening and closing; The driving device of electric and pneumatic valves should operate smoothly, control sensitively, and meet the design requirements for on/off time to ensure timely response in emergency situations. At the same time, the valve should have accurate stroke limits to prevent excessive opening and closing of the valve disc from damaging components.

　　六、专项测试：量身定制保特性

　　6、 Specialized testing: Tailored protection features

　　特殊工况或类型的阀门需专项测试。低温阀门要做低温密封试验，调节阀需测流量特性，安全阀则必须校验整定压力，确保超压时及时泄压。

　　Valves with special operating conditions or types require specialized testing. Low temperature valves need to undergo low-temperature sealing tests, regulating valves need to measure flow characteristics, and safety valves must verify the set pressure to ensure timely pressure relief in case of overpressure.

　　阀门验收检测标准是一个严密体系，涵盖外观、尺寸、材质、压力、操作及专项测试等多方面。只有严格遵循这些标准，才能确保阀门在管道系统中稳定可靠运行，为工业生产筑牢安全防线。

　　The valve acceptance and testing standards are a rigorous system that covers various aspects such as appearance, size, material, pressure, operation, and specialized testing. Only by strictly following these standards can we ensure the stable and reliable operation of valves in pipeline systems, and build a solid safety line for industrial production.

　　山东通风管道：排烟罩滤网更换频率建议，写成段落形式的文章，写的尽量详细一些，不能出现公司名称，不能出现百度违禁词，不能有表格，不能抄袭，带有文章主标题，标题写的有意思一些，不要出现虚假信息

　　Shandong ventilation duct: Suggestions for replacement frequency of exhaust hood filter screen. Write an article in paragraph form, as detailed as possible, without company name, prohibited words on Baidu, tables, plagiarism, and with an interesting main title. Do not include false information

　　山东通风管道 “滤网焕新计”：多久换一次才靠谱？

　　Shandong ventilation duct 'filter screen renewal plan': how often is it reliable to replace it?

　　在山东的餐饮后厨、工厂车间里，排烟罩滤网如同通风管道的 “卫士”，时刻拦截油烟、粉尘等污染物。但滤网并非 “永动机”，使用久了会因堵塞影响排烟效率，甚至带来安全隐患。究竟多久更换一次滤网才科学？这背后藏着环境、使用频率等多方面的影响因素。

　　In Shandong's catering kitchens and factory workshops, exhaust hood filters act as the "guardians" of ventilation ducts, constantly intercepting pollutants such as oil fumes and dust. But the filter is not a "perpetual motion machine", and prolonged use can affect smoke exhaust efficiency due to blockage, and even pose safety hazards. How often is it scientific to replace the filter screen? There are various influencing factors such as environment and frequency of use hidden behind this.

　　使用环境决定更换 “基础节奏”

　　The environment determines the replacement of the 'basic rhythm'

　　滤网更换频率与使用场景紧密相关。在山东的鲁菜餐馆后厨，爆炒、煎炸等烹饪方式频繁，油烟量大且浓稠，滤网极易被油脂附着。这类环境下，若每天营业超 8 小时，建议每 1 - 2 个月更换一次滤网。油脂堆积不仅会降低排烟效率，还可能因高温引发火灾。而在以蒸煮为主的面食店，油烟产生量较少，滤网更换周期可适当延长至 3 - 4 个月。对于工厂车间的排烟罩，若涉及金属加工、焊接等产生大量粉尘、颗粒物的工序，滤网堵塞速度更快，可能需要每 2 - 3 周检查一次，视脏污程度缩短至 1 - 2 个月更换；若只是处理普通轻粉尘，3 - 6 个月更换一次较为合适。

　　The frequency of filter replacement is closely related to the usage scenario. In the back kitchen of Shandong's Shandong cuisine restaurants, cooking methods such as stir frying and deep frying are frequent, resulting in a large and thick amount of oil fumes, and the filter is easily attached by oil. In such environments, if the business operates for more than 8 hours a day, it is recommended to replace the filter every 1-2 months. Accumulation of grease not only reduces smoke exhaust efficiency, but may also cause fires due to high temperatures. In noodle shops that mainly focus on steaming and cooking, the amount of oil fume generated is relatively small, and the filter replacement cycle can be appropriately extended to 3-4 months. For the smoke exhaust hood in factory workshops, if it involves processes such as metal processing and welding that generate a large amount of dust and particulate matter, the clogging speed of the filter screen is faster, and it may need to be inspected every 2-3 weeks. Depending on the degree of dirt, it can be replaced every 1-2 months; If only dealing with ordinary light dust, it is more appropriate to replace it every 3-6 months.

　　使用时长与强度 “加速损耗”

　　Duration and intensity of use "accelerated loss"

　　滤网的实际工作时长和强度，直接影响其寿命。在山东一些 24 小时营业的快餐店、夜市摊位，排烟罩几乎不间断运行，滤网承受的压力远超普通店铺。这类高强度使用场景下，即使油烟量相对较小，也建议将更换周期缩短 20% - 30%。例如，原本 3 个月更换一次的滤网，可能需要 2 个月左右就进行更换。此外，频繁启动、关闭排烟设备，会导致气流冲击滤网，加速滤网结构老化与杂质附着，也需适当提前更换时间。

　　The actual working time and strength of the filter directly affect its lifespan. In some 24-hour fast food restaurants and night market stalls in Shandong, the exhaust hood runs almost continuously, and the pressure on the filter is much higher than that of ordinary shops. In such high-intensity usage scenarios, even if the oil fume volume is relatively small, it is recommended to shorten the replacement cycle by 20% -30%. For example, a filter that was originally replaced every three months may need to be replaced in about two months. In addition, frequent start-up and shutdown of smoke exhaust equipment can cause airflow to impact the filter screen, accelerate the aging of the filter screen structure and the adhesion of impurities, and also require appropriate early replacement time.

　　滤网材质与结构影响更换周期

　　The material and structure of the filter screen affect the replacement cycle

　　不同材质和结构的滤网，更换频率也有差异。常见的金属丝网滤网，虽然耐用性强，但油污、粉尘附着后清理难度大，堵塞后通风阻力增加明显，建议按上述周期正常更换。而一些新型的纳米涂层滤网，表面具有疏油疏水特性，能延缓污染物附着，在相同使用环境下，更换周期可延长 1 - 2 个月。滤网的结构同样关键，多层复合滤网通过分级过滤，可分散污染物压力，相比单层滤网，使用寿命更长；但如果某一层滤网破损，需整体更换，避免污染物直接进入通风管道。

　　The replacement frequency of filters with different materials and structures also varies. The common metal wire mesh filter, although durable, is difficult to clean after oil and dust adhere, and the ventilation resistance increases significantly after blockage. It is recommended to replace it normally according to the above cycle. Some new types of nano coated filters have oil and water repellent properties on their surfaces, which can delay the attachment of pollutants. Under the same usage environment, the replacement cycle can be extended by 1-2 months. The structure of the filter is equally critical. Multi layer composite filters can disperse pollutant pressure through graded filtration, and have a longer service life compared to single-layer filters; But if one layer of the filter screen is damaged, it needs to be replaced as a whole to prevent pollutants from directly entering the ventilation duct.

　　定期检查与应急更换 “双保险”

　　Regular inspection and emergency replacement "dual insurance"

　　除了按周期更换，日常检查必不可少。可每月拆卸滤网，观察其表面脏污程度：若滤网表面油脂、粉尘覆盖面积超过 50%，且通过常规清洗无法恢复通透，即便未到更换周期，也应立即更换。此外，若发现排烟设备运行时噪音增大、出风口风量明显减弱，很可能是滤网堵塞严重，需及时检查更换。在春节、国庆等餐饮旺季来临前，即使滤网未到更换时间，也建议提前更换，确保排烟系统高效运行，避免因滤网问题影响营业。

　　In addition to periodic replacement, daily inspection is essential. The filter screen can be disassembled monthly to observe the degree of dirt on its surface: if the surface of the filter screen is covered with grease and dust for more than 50% and cannot be restored to transparency through regular cleaning, it should be replaced immediately even before the replacement cycle. In addition, if it is found that the noise of the smoke exhaust equipment increases and the air volume at the air outlet decreases significantly during operation, it is likely that the filter screen is severely clogged and needs to be checked and replaced in a timely manner. Before the peak season of catering such as Spring Festival and National Day, even if the filter screen is not ready for replacement, it is recommended to replace it in advance to ensure the efficient operation of the smoke exhaust system and avoid affecting business due to filter screen problems.

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