波纹管截止阀

波纹管截止阀是一种特殊设计的截止阀，其核心特征是在阀杆部位采用金属波纹管（Bellows）作为动密封元件，与传统的填料函（Stem Packing）密封形成双重密封结构。这种设计彻底解决了普通截止阀阀杆处易发生外泄漏的问题，尤其适用于易燃、易爆、有毒、贵重或真空度高且要求“零外泄漏”的苛刻工况。

波纹管截止阀核心特点：

零外泄漏密封：

主密封：金属波纹管的一端与阀杆焊死，另一端与阀盖焊死，形成一个可轴向伸缩的密闭腔室，将流动介质与阀杆完全隔离，实现了动密封稳定性。

次级密封：通常保留填料函作为备用密封，在波纹管万一失效时提供安全屏障，构成双重保险。

高安全性与环保性：完全杜绝了介质从阀杆处向外泄漏的可能性，保护人员安全和环境，符合严格环保（如EPA）和排放标准。

适用于苛刻介质：特别适合处理蒸汽、热油、易燃气体、有毒化学品、低温液体（如液氮、LNG）或腐蚀性介质。

长寿命与低维护：波纹管结构减少了阀杆与填料的摩擦磨损，降低了维护频率和长期成本。

保留截止阀优点：继承了普通截止阀密封性好、启闭行程短等优点。

波纹管截止阀主要应用领域：

石油化工、精细化工工艺流程

波纹管截止阀制药工业（符合GMP要求）

核能、太阳能光热发电的高温蒸汽系统

液化天然气（LNG）、低温设备

有害气体、液体处理装置

波纹管截止阀产品名称：

中文： 波纹管截止阀

英文： Bellows Seal Globe Valve (或 Bellows-Sealed Globe Valve)

Bellows Seal Globe Valve

A Bellows Seal Globe Valve is a specialized type of globe valve that incorporates a hermetically sealed metal bellows assembly as the primary stem sealing element. This design provides a leak-proof solution for the valve stem, making it the ideal choice for handling toxic, hazardous, expensive,  volatile media  external leakage must be absolutely prevented.

Key Features:

Zero External Leakage:

Primary Seal: The metal bellows is welded to the valve stem at one end  to the bonnet at the other, creating a flexible, hermetic seal that completely isolates the stem  the process fluid.

Secondary Seal: A traditional packing gland is often retained as a backup safety measure, providing a dual containment seal for maximum safety.

Enhanced Safety & Environmental Compliance: Eliminates the risk of fugitive emissions  the stem area, ensuring operator safety  environmental protection. Complies with stringent international environmental regulations (e.g., TA-Luft, EPA).

Ideal for Critical Media: Specifically designed for demanding applications involving steam, hot oils, flammable gases, toxic chemicals, cryogenic fluids (e.g., liquid nitrogen, LNG),  corrosive media.

Long Service Life & Low Maintenance: The bellows assembly minimizes stem friction  wear  packing, significantly reducing maintenance needs  total cost of ownership.

Inherits Globe Valve Advantages: Retains all the benefits of a standard globe valve, including excellent shut-off capability  short stem travel.

Primary Applications:

Process piping in petrochemical  chemical industries

Pharmaceutical industry (GMP compliant applications)

High-temperature steam systems in nuclear  solar thermal power plants

Liquefied Natural Gas (LNG)  cryogenic facilities

Systems handling hazardous  expensive gases  liquids

关键术语：

波纹管: Bellows

动密封: Dynamic Seal

零泄漏: Zero Leakage / Fugitive Emissions Control

双重密封: Dual Seal / Secondary Containment