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　　二、尺寸測量：精準匹配是關鍵

　　2、 Size measurement: Accurate matching is key

　　閥門尺寸精度決定其能否與管道適配。用卡尺、千分尺等工具測量公稱通徑、閥桿直徑等關鍵尺寸，偏差需控制在極小范圍。法蘭連接閥門的法蘭外徑、螺栓孔距等必須精準，否則安裝后易泄漏；螺紋連接閥門的螺紋規格也要與管道完全匹配。此外，閥門結構長度關乎安裝布局與系統應力，需嚴格按標準執行。

　　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、材質核驗：“內在實力” 定乾坤

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

　　材質是閥門性能的核心。閥體、閥桿等關鍵部位材質必須符合設計與標準，鑄鐵閥成本低但耐腐蝕弱，不銹鋼閥則適用于化工等場景。合金鋼閥門需逐件光譜分析，確保合金成分達標；特殊行業還要關注材質潔凈度，避免污染介質。

　　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、壓力測試：嚴苛考驗測真金

　　4、 Stress Test: Rigorous Test Testing Real Gold

　　壓力測試是驗收 “重頭戲”，包括殼體強度試驗與密封性能試驗。殼體強度試驗以 1.5 倍公稱壓力施壓，保壓 5 分鐘，觀察閥體有無滲漏、變形；密封性能試驗用 1.1 倍公稱壓力，截斷閥要求內漏為零，其他閥門嚴控外漏，尤其對輸送危險介質的閥門，外漏絕不可容忍。

　　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、操作性能測試：靈活順暢保運行

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

　　手動閥門操作應輕便靈活，開閉無卡阻；電動、氣動閥門的驅動裝置需運轉平穩，控制靈敏，開關時間符合設計要求，確保緊急情況下能及時響應。同時，閥門應具備準確的行程限位，防止閥瓣過度啟閉損壞部件。

　　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、專項測試：量身定制保特性

　　6、 Specialized testing: Tailored protection features

　　特殊工況或類型的閥門需專項測試。低溫閥門要做低溫密封試驗，調節閥需測流量特性，安全閥則必須校驗整定壓力，確保超壓時及時泄壓。

　　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.

　　閥門驗收檢測標準是一個嚴密體系，涵蓋外觀、尺寸、材質、壓力、操作及專項測試等多方面。只有嚴格遵循這些標準，才能確保閥門在管道系統中穩定可靠運行，為工業生產筑牢安全防線。

　　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.

　　山東通風管道：排煙罩濾網更換頻率建議，寫成段落形式的文章，寫的盡量詳細一些，不能出現公司名稱，不能出現百度違禁詞，不能有表格，不能抄襲，帶有文章主標題，標題寫的有意思一些，不要出現虛假信息

　　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

　　山東通風管道 “濾網煥新計”：多久換一次才靠譜？

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

　　在山東的餐飲后廚、工廠車間里，排煙罩濾網如同通風管道的 “衛士”，時刻攔截油煙、粉塵等污染物。但濾網并非 “永動機”，使用久了會因堵塞影響排煙效率，甚至帶來安全隱患。究竟多久更換一次濾網才科學？這背后藏著環境、使用頻率等多方面的影響因素。

　　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.

　　使用環境決定更換 “基礎節奏”

　　The environment determines the replacement of the 'basic rhythm'

　　濾網更換頻率與使用場景緊密相關。在山東的魯菜餐館后廚，爆炒、煎炸等烹飪方式頻繁，油煙量大且濃稠，濾網極易被油脂附著。這類環境下，若每天營業超 8 小時，建議每 1 - 2 個月更換一次濾網。油脂堆積不僅會降低排煙效率，還可能因高溫引發火災。而在以蒸煮為主的面食店，油煙產生量較少，濾網更換周期可適當延長至 3 - 4 個月。對于工廠車間的排煙罩，若涉及金屬加工、焊接等產生大量粉塵、顆粒物的工序，濾網堵塞速度更快，可能需要每 2 - 3 周檢查一次，視臟污程度縮短至 1 - 2 個月更換；若只是處理普通輕粉塵，3 - 6 個月更換一次較為合適。

　　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.

　　使用時長與強度 “加速損耗”

　　Duration and intensity of use "accelerated loss"

　　濾網的實際工作時長和強度，直接影響其壽命。在山東一些 24 小時營業的快餐店、夜市攤位，排煙罩幾乎不間斷運行，濾網承受的壓力遠超普通店鋪。這類高強度使用場景下，即使油煙量相對較小，也建議將更換周期縮短 20% - 30%。例如，原本 3 個月更換一次的濾網，可能需要 2 個月左右就進行更換。此外，頻繁啟動、關閉排煙設備，會導致氣流沖擊濾網，加速濾網結構老化與雜質附著，也需適當提前更換時間。

　　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.

　　濾網材質與結構影響更換周期

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

　　不同材質和結構的濾網，更換頻率也有差異。常見的金屬絲網濾網，雖然耐用性強，但油污、粉塵附著后清理難度大，堵塞后通風阻力增加明顯，建議按上述周期正常更換。而一些新型的納米涂層濾網，表面具有疏油疏水特性，能延緩污染物附著，在相同使用環境下，更換周期可延長 1 - 2 個月。濾網的結構同樣關鍵，多層復合濾網通過分級過濾，可分散污染物壓力，相比單層濾網，使用壽命更長；但如果某一層濾網破損，需整體更換，避免污染物直接進入通風管道。

　　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.

　　定期檢查與應急更換 “雙保險”

　　Regular inspection and emergency replacement "dual insurance"

　　除了按周期更換，日常檢查必不可少。可每月拆卸濾網，觀察其表面臟污程度：若濾網表面油脂、粉塵覆蓋面積超過 50%，且通過常規清洗無法恢復通透，即便未到更換周期，也應立即更換。此外，若發現排煙設備運行時噪音增大、出風口風量明顯減弱，很可能是濾網堵塞嚴重，需及時檢查更換。在春節、國慶等餐飲旺季來臨前，即使濾網未到更換時間，也建議提前更換，確保排煙系統高效運行，避免因濾網問題影響營業。

　　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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