外观质量。的工业阀门产品应做到表面光洁，无裂纹缩孔砂眼等缺陷。

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

产品标识应清晰，应注有商标标志阀体材料代号公称压力公称尺寸熔炼炉号产品的生产系列编号流向等标识。

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.

阀门出厂前应逐台进行强度及密封试验，有上密封结构的必须进行上密封试验，无介质流向要求的阀门必须进行双向密封试验。试验合格后悬挂耐压试验合格标识。必要时，在阀门产品安装前应进行抽样复检。

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.

阀门启闭动作应平顺无卡阻。当采用手轮或手柄操作时，开关方向应标识清楚，顺时针为关，逆时针为开。阀门启闭操作力不应超过350N，能够单人操作。

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.

壳体小壁厚和阀杆小直径作为阀门重要的性能指标，应满足相关产品标准的要求。不少阀门厂家为了节约成本而偷工减料，生产的阀门壁厚或阀杆直径严重缩水，对工业生产的性产生不利影响。

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.

有特殊工况或特殊用途的工业阀门应经过试验验证其性能是否满足标准和使用的要求。如调节阀的流量调节性能低温阀门的低温密封性能耐火阀门的耐火性能蒸汽疏水阀的阻汽排水性能等。

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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This article is provided by Lianggong Valve Agency with technical support. For more detailed and exciting content, please click on our website //m.rabieb.com We will wholeheartedly provide you with satisfactory service.