内螺纹截止阀
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性能特点
技术参数
内螺纹截止阀
内螺纹截止阀是一种通过阀杆的升降和阀瓣的开启/关闭来控制流体通断的阀门。其关键特征是阀体进出口端加工有内螺纹，通过螺纹与管道或其他设备的外螺纹直接旋紧连接。这种阀门在完全开启时，流道阻力较大，因此通常不用于调节流量，而更适用于需要稳定密封的启闭操作。
内螺纹截止阀核心特点：
螺纹连接：阀体带有内螺纹接口，安装简便，结构紧凑，占用空间小，密封性较好，是中小口径管道系统中常见的连接方式。
稳定的密封性：采用平面或锥面密封，启闭时阀瓣与阀座密封面之间摩擦力小，磨损轻，密封性能好，使用寿命长。
调节性能一般：由于阀瓣的行程与流量不成线性关系，且流阻较大，因此其主要功能是切断流体，不推荐用于调节流量。
流体单向流动：安装时有方向性要求，必须使管道流体从阀瓣下方向上流动（即低进高出）。这样设计可使关闭操作更省力，且阀杆填料函部分在阀门关闭时不与介质接触，减少了泄漏风险。
操作方式多样：可通过手轮、齿轮、电动执行器等进行操作。
内螺纹截止阀主要应用领域：
采暖系统（暖气）
给排水管道、热水器
石油、化工设备中的小口径管线
蒸汽、压缩空气系统
各种工业设备和实验室仪器
产品名称：
中文： 内螺纹截止阀
英文： Threaded Globe Valve 或 Internal Thread Globe Valve
A Threaded Globe Valve is a type of linear motion valve designed for stopping starting fluid flow. It is characterized by internal threads (FPT - Female Pipe Threads) at its ports, which allow for direct screw connection to external threaded (MPT) pipes fittings. It is ideal for throttling due to high flow resistance but is excellent for reliable shut-off applications.
Key Features:
Threaded Connection: Features internal (female) pipe threads (e.g., NPT, BSPT) for simple, compact, space-saving installation, offering good sealing for small-bore piping systems.
Reliable Sealing: Employs plane cone sealing. The disc seat rings experience minimal friction during operation, reducing wear ensuring tight sealing a long service life.
Limited Throttling Capability: Characterized by high flow resistance non-linear flow characteristics, it is primarily designed for on/off service, for precise flow regulation.
Unidirectional Flow: The valve must be installed with the flow direction under the disc (flow enters below the seat exits above). This design ensures easier closing prevents the stem packing being exposed to system media when closed, reducing the risk of leakage.
Multiple Actuation Options: Can be operated manually via a handwheel, with automated actuators (electric, pneumatic).
Primary Applications:
Heating systems (radiators)
Water supply drainage pipelines, water heaters
Small-bore lines in petrochemical process equipment
Steam compressed air lines
Various industrial equipment laboratory instruments
术语补充：
内螺纹: Female Thread / Internal Thread / FPT (Female Pipe Thread)
截止阀: Globe Valve 或 Stop Valve