锻钢低温对焊闸阀

概述:

锻钢低温对焊闸阀是在锻钢对焊闸阀基础上,针对低温及超低温工况(通常指 - 40℃至 - 196℃,甚至更低)设计的专用阀门,采用低温韧性优异的锻造钢材、特殊密封结构及防冷脆处理,核心功能是在极寒环境下实现高压介质的可靠截断,广泛应用于 LNG(液化天然气)、液氮、液氧等低温流体输送系统。


公称压力:PN16~PN100、ANSI Class 150~900LB

公称通径:DN15~DN300

适用温度:-40℃~-253℃

适用介质:LNG(液化天然气)、液氮(LN2)、液氧(LO2)、液氢(LH2)、低温丙烷

低温冲击功:AKV≥27J(-196℃)

Products and services that meet fluid control requirements

Each process, each facility, and each environmental constraint has its own special requirements. Therefore, Dongyan offers a comprehensive range of products covering different performance levels, pressures, different functions and different materials.

Detail

选型与维护要点(低温专项)

1、选型关键:

● 材质匹配介质:LNG 选 304L/316L,液氢选 Inconel 625,含硫低温介质选 Monel 400;

● 温度留余量:实际工作温度需低于阀门额定最低温度(如 - 196℃工况选额定 - 200℃阀门);

● 执行器适配:电动执行器需选 “低温防爆型”(Ex d IIB T4 Gb),气动执行器需配 “低温过滤减压阀”(防止压缩空气中水分结冰堵塞)。

2、维护要点:

● 禁止骤冷骤热:阀门开启前必须预冷(预冷速率≤5℃/min),关闭后需缓慢升温,避免部件变形;

● 润滑脂选用:阀杆润滑需用 “低温合成润滑脂”(如聚四氟乙烯基润滑脂,耐 - 200℃),禁止用普通润滑脂(低温下会凝固);

● 定期密封性检测:每 6 个月用 “氦质谱检漏仪” 检测波纹管密封性能(LNG 阀门泄漏率需≤1×10⁻⁹ Pa・m³/s);

● 防结冰措施:阀门外部需做 “保冷保温”(如包覆聚氨酯保冷层),避免空气中水分在阀体表面结冰,影响操作或腐蚀阀体。

Product Application Scope

These devices are suitable for accurately controlling media such as gases, liquids, steam, etc., and maintaining process parameters such as pressure, flow rate, temperature, and liquid level at given values. Especially suitable for work environments where the allowable pressure difference is small and the allowable leakage is also small, and the pressure difference is not significant.

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