外觀質量。優質的工業閥門產品應做到表面光潔，無裂紋縮孔砂眼等缺陷。

Appearance quality. High quality industrial valve products should have a smooth surface and no defects such as cracks, shrinkage holes, sand holes, etc.

產品標識應清晰，應注有商標標志閥體材料代號公稱壓力公稱尺寸熔煉爐號產品的生產系列編號流向等標識。

The product identification should be clear, with trademark markings, valve body material code, nominal pressure, nominal size, melting furnace number, production series number, flow direction, and other markings.

閥門出廠前應逐臺進行強度及密封試驗，有上密封結構的必須進行上密封試驗，無介質流向要求的閥門必須進行雙向密封試驗。試驗合格后懸掛耐壓試驗合格標識。必要時，在閥門產品安裝前應進行抽樣復檢。

Before leaving the factory, valves should undergo strength and sealing tests one by one. Valves with upper sealing structures must undergo upper sealing tests, while valves without medium flow requirements must undergo bidirectional sealing tests. After passing the test, hang the voltage withstand test qualification label. If necessary, sampling and re inspection should be carried out before the installation of valve products.

閥門啟閉動作應平順無卡阻。當采用手輪或手柄操作時，開關方向應標識清楚，順時針為關，逆時針為開。閥門啟閉最大操作力不應超過350N，能夠單人操作。

The valve opening and closing action should be smooth and free of jamming. When using a handwheel or handle for operation, the direction of the switch should be clearly marked, with clockwise indicating off and counterclockwise indicating on. The maximum operating force for valve opening and closing should not exceed 350N and can be operated by a single person.

殼體最小壁厚和閥桿最小直徑作為閥門重要的安全性能指標，應滿足相關產品標準的要求。不少閥門廠家為了節約成本而偷工減料，生產的閥門壁厚或閥桿直徑嚴重縮水，對工業生產的安全性產生不利影響。

The minimum wall thickness of the shell and the minimum diameter of the valve stem, as important safety performance indicators of the valve, should meet the requirements of relevant product standards. Many valve manufacturers cut corners to save costs, resulting in severe shrinkage of valve wall thickness or stem diameter, which has a negative impact on the safety of industrial production.

有特殊工況或特殊用途的工業閥門應經過試驗驗證其性能是否滿足標準和使用的要求。如調節閥的流量調節性能低溫閥門的低溫密封性能耐火閥門的耐火性能蒸汽疏水閥的阻汽排水性能等。

Industrial valves with special working conditions or special purposes should undergo testing to verify whether their performance meets the standards and usage requirements. The flow regulation performance of the regulating valve, the low-temperature sealing performance of the low-temperature valve, the fire resistance performance of the fire-resistant valve, and the steam drainage performance of the steam trap valve.

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