高密封截止阀

       GMJ11高密封截止阀主要用于石油、化工、电力、冶金、制药、轻工等行业的管路上，作启闭装置。 GMJ11(13)F/H型，阀门密封副采用软硬密封材料，实现双重密封，关闭时可达到无泄漏。是电站、炼油、化工装置和仪表测量管路中的一种连接方式的阀门。

产品名称：高密封截止阀 

       产品型号：GMJ11 GMJ41
       工作压力：3000PSI~6000PSI(413bar),高可达10000PSI(689bar)
       工作温度：
       PTFE填料：-38oC 至 180oC (-100oF 至 356oF)
       PPL 填料：-38oC 至 280oC (-100oF 至 536oF)
       石墨填料：-24oC 至 480oC (-75oF 至 896oF)
       连接端口:螺纹 法兰

       适用介质：水 油 气

鑫盛源高密封截止阀优点：     

       1、两截阀杆设计，上阀杆螺纹淡化工艺处理

       2、下阀杆表经经滚压硬化处理上阀杆螺纹的润滑脂与系统介质隔离

       3、无旋转的下阀杆垂直运动代替旋转升降，减少阀杆行程对填料的磨擦，手感更轻便

       4、阀门在全开位置具有背密封功能

       5、可安装手柄或者手轮操作，稳固耐用多种颜色手柄可供选择

       6、每只阀门在出厂前均按设计压力的1.1倍进行氮气密封测试,并按额定工作压力的1.5倍水压进行壳体强度测试。

高密封截止阀

高密封截止阀是一种通过创新密封结构实现流体截断的工业阀门，其核心原理在于采用多重密封技术和特殊结构设计来确保在高压、高温等严苛工况下的零泄漏性能。以下是其工作原理及技术特点的详细分析：

1. 基本工作原理

高密封截止阀通过阀杆的轴向运动驱动阀瓣与阀座紧密贴合或分离，实现介质的切断或流通：

强制密封机制：关闭时，阀杆对阀瓣施加机械压力，使阀瓣密封面（通常为平面或锥面）与阀座密封面强制贴合，形成金属硬密封或复合密封。介质压力越高，密封面压紧力越大，形成“压力自紧式密封”。

流向设计：传统设计介质从阀瓣下方进入（低进高出），但现代高密封阀门多采用“高进低出”流向，利用介质压力辅助密封，减少阀杆受力并降低操作扭矩。

2. 核心密封技术

高密封性能通过以下创新结构实现：

波纹管密封：采用双层不锈钢波纹管（如316L）隔离阀杆与介质，彻底消除填料泄漏风险，寿命较传统结构提升3倍以上。波纹管可承受425°C高温和CLASS 800压力等级。

双压力自密封系统：结合阀盖楔形密封环和填料压环，当介质压力超过5MPa时，推动密封环径向膨胀实现自锁，形成“压力越大密封越紧”的效果。

硬质合金密封面：阀瓣与阀座密封面堆焊司太立（Stellite）钴基合金，耐磨、耐冲刷，寿命超10万次启闭循环。

3. 结构特点与性能优势

低摩擦设计：阀瓣与阀座无相对滑动，减少密封面磨损；升降旋转杆式结构降低操作扭矩（仅为同规格闸阀的30%）。

耐极端工况：锻钢阀体与氮化处理的阀杆可承受-196°C至550°C温度范围及200MPa超高压（如OKV系列超高压截止阀）。

在线维护：倒密封结构允许不停机更换填料，部分型号配备可拆卸阀座，便于维修。

4. 典型应用场景

石化与能源：乙烯裂解装置高温切断（425°C）、核电站主蒸汽管道（CLASS 800压力等级）。

超高压系统：石油开采、化工流程中用于40MPa~200MPa的介质控制（如江苏中力OKV系列）。

腐蚀性介质：衬氟截止阀适用于强酸（王水、氢氟酸）和强碱管路，密封圈采用PTFE或石墨材料。

5. 与传统截止阀的对比

特性高密封截止阀普通截止阀密封形式波纹管+硬质合金+自紧结构单一填料或金属密封泄漏等级BS EN 12266-1 A级（接近零泄漏）常规标准泄漏量耐压能力200MPa（超高压型号）通常≤16MPa维护周期10万次启闭以上需频繁更换填料

总结

高密封截止阀通过波纹管隔离、压力自紧密封和硬质合金堆焊等技术的综合应用，解决了传统阀门易泄漏、寿命短的问题。其设计兼顾高强度与低操作扭矩，尤其适合高温高压、腐蚀性或危险介质的精密控制。用户选型时需根据介质特性、压力等级及维护需求选择适配型号（如波纹管密封型或超高压锻钢型）。

Working Principle of High-Sealing Globe Valve

The high-sealing globe valve is an industrial valve designed with advanced sealing structures to achieve reliable fluid shutoff. Its core principle lies in multi-layer sealing technologies specialized structural designs to ensure zero leakage under extreme conditions such as high pressure temperature. Below is a detailed analysis of its working mechanism technical features:

1. Basic Working Principle

The high-sealing globe valve controls fluid flow through the axial movement of the stem, driving the disc to tightly engage disengage the seat:

Forced Sealing Mechanism: When closed, the stem applies mechanical pressure to press the disc sealing surface (typically flat conical) against the seat, forming a metal-to-metal composite seal. Higher fluid pressure increases the sealing force, creating a "pressure-assisted self-tightening seal."

Flow Direction Design: Traditional designs feature fluid entering below the disc (low-inlet, high-outlet), but modern high-sealing valves often adopt a "high-inlet, low-outlet" flow path, utilizing fluid pressure to enhance sealing while reducing stem load operating torque.

2. Core Sealing Technologies

High-sealing performance is achieved through the following innovations:

Bellows Seal: Dual-layer stainless steel bellows (e.g., 316L) isolate the stem the medium, eliminating packing leakage risks entirely. Bellows withstand temperatures up to 425°C pressure ratings of CLASS 800, with a lifespan 3x longer than conventional designs.

Dual Pressure Self-Sealing System: Combines a wedge-shaped gland ring packing compression ring. When pressure exceeds 5MPa, the sealing ring expands radially to self-lock, creating a "higher pressure, tighter seal" effect.

Hard-Alloy Sealing Surfaces: Disc seat surfaces are welded with Stellite cobalt-based alloy for wear erosion resistance, supporting over 100,000 open-close cycles.

3. Structural Features & Performance Advantages

Low-Friction Design: The disc seat have no relative sliding motion, minimizing wear. A rising-rotating stem mechanism reduces operating torque (only 30% of gate valves with equivalent specifications).

Extreme Condition Resistance: Forged steel bodies nitrided stems endure temperatures -196°C to 550°C ultra-high pressures up to 200MPa (e.g., OKV series ultra-high-pressure globe valves).

Online Maintenance: Backseat designs allow packing replacement without shutdown. Some models feature removable seats for easy repairs.

4. Typical Applications

Petrochemical & Energy: High-temperature isolation in ethylene cracking units (425°C), nuclear power plant main steam pipelines (CLASS 800).

Ultra-High-Pressure Systems: Oil extraction chemical processes requiring 40MPa–200MPa control (e.g., Jiangsu Zhongli OKV series).

Corrosive Media: Lined PTFE globe valves for strong acids (aqua regia, hydrofluoric acid) alkalis, using PTFE graphite seals.

5. Comparison with Conventional Globe Valves

FeatureHigh-Sealing Globe ValveStandard Globe ValveSealing TypeBellows + hard alloy + self-tighteningSingle packing metal sealLeakage ClassBS EN 12266-1 Grade A (near-zero leakage)Standard leakage ratesPressure CapacityUp to 200MPa (ultra-high-pressure models)Typically ≤16MPaMaintenance Cycle100,000+ cyclesFrequent packing replacements

Summary

High-sealing globe valves integrate bellows isolation, pressure-assisted sealing, hard-alloy surfacing to overcome traditional valve limitations like leakage short lifespans. Their design balances high strength with low operating torque, making them ideal for precise control of high-temperature, high-pressure, hazardous media. Selection should consider fluid properties, pressure ratings, maintenance needs (e.g., bellows-sealed ultra-high-pressure forged steel models).

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