长轴气动球阀

长轴气动球阀是一种专为埋地安装或保温层包裹的工况设计的特殊气动执行球阀。其核心特征是在标准气动球阀的基础上，配置了一个加长的阀杆延伸轴，使得气动执行器能够远离高温/低温的工艺管道或介质，安装在地面或保温层之外，从而保护执行器免受极端温度、潮湿、腐蚀或外部机械损伤的影响。

长轴气动球阀集成了球阀的切断功能与气动执行器的自动化控制优势，并通过长轴设计解决了特殊安装环境下的稳定性难题，是石油、化工、供热等行业关键管道的理想选择。

Product Overview of an Extended Stem Pneumatic Ball Valve

An Extended Stem Pneumatic Ball Valve is a specialized pneumatically actuated ball valve designed for buried installation applications the valve is encased in insulation. Its defining feature is an elongated stem extension shaft added to a standard pneumatic ball valve. This design positions the pneumatic actuator away the high-temperature low-temperature process pipeline medium, installing it above ground outside the insulation layer. This protects the actuator extreme temperatures, moisture, corrosion, external mechanical damage.

This valve combines the excellent shut-off capability of a ball valve with the advantages of automated control a pneumatic actuator. The extended stem design addresses reliability challenges in special installation environments, making it an ideal choice for critical pipelines in industries such as oil gas, chemical, district heating.

核心特点与功能 (Key Features Functions)

长轴气动球阀长轴设计 (Extended Stem Design)

功能目的：通过加长阀杆，将执行器提升到易于操作和观察的位置，避免其埋于地下或包覆在保温层中，确保执行器的工作环境温度处于其允许范围内。

标准配置：延伸轴长度可根据客户埋地深度或保温层厚度进行定制。

长轴气动球阀气动执行 (Pneumatic Actuation)

长轴气动球阀自动化控制：采用气动活塞式或齿轮齿条式执行器，可实现远程自动控制、快速启闭（通常仅需90度旋转）。

附件选项：可配装电磁阀、限位开关、气动三联件（过滤器、减压阀、油雾器）及手轮机构，实现逻辑控制、信号反馈、气源处理和手动操作。

长轴气动球阀坚固与密封 (Robustness Sealing)

阀体材质：常采用碳钢（WCB）、不锈钢（304/316）等，耐压等级高，适用于多种介质。

长轴气动球阀关键密封：

阀杆密封：采用多重V型填料或O型圈密封组合，确保延伸轴部分在埋地或高温环境下长期密封稳定，无外泄漏。

球体密封：采用PTFE、PPL、金属密封等软硬密封材料，确保零泄漏。

长轴气动球阀保温设计 (Insulation Design)

适用性：阀体通常设计成夹套型（Jacketed），或在阀体外部预留足够的空间，以便连接保温蒸汽管道或包裹保温材料，防止介质在阀腔内冷凝或结晶。

长轴气动球阀广泛应用 (Wide Application)

行业：广泛应用于石油、天然气、化工、集中供热、城市燃气等领域。

工况：特别适用于埋地管网、需保温的热力管道、以及执行器需要避免工艺高温的场合。

Key Features Functions:

Extended Stem Design

Purpose: The elongated stem raises the actuator to an easily accessible visible position, preventing it being buried underground encased in insulation. This ensures the actuator operates within its permissible temperature range.

Customization: The extension stem length can be customized according to the burial depth insulation thickness.

Pneumatic Actuation

Automated Control: Utilizes pneumatic piston rack--pinion actuators for remote automatic control quick open-close operation (typically a 90-degree rotation).

Accessories: Can be equipped with solenoid valves, limit switches, air filter regulators lubricators (FRLs), manual overrides for logic control, signal feedback, air treatment, manual operation.

Robustness Sealing

Body Material: Commonly made of carbon steel (WCB), stainless steel (304/316), etc., with high pressure ratings for various media.

Critical Sealing:

Stem Sealing: Employs multiple V-ring packings O-ring seals to ensure long-term, reliable external sealing of the extended stem section in buried high-temperature environments.

Ball Sealing: Uses soft (PTFE, PPL) hard (metal) seals to achieve bubble-tight shut-off.

Insulation Compatibility

Application: The valve body is often designed as a jacketed type with sufficient external space to connect steam tracing lines apply insulation materials, preventing medium condensation crystallization within the valve cavity.

Wide Application

Industries: Widely used in oil gas, chemical, district heating, city gas sectors.

Services: Particularly suited for buried pipelines, thermally insulated heat tracing lines, applications the actuator must be protected process heat.

长轴气动球阀典型应用场景 (Typical Application Scenarios)

Buried Gas Pipeline Valves: 城市燃气埋地管网中的切断阀。

Insulated Heating Pipelines: 集中供热系统中需要保温的阀门。

Chemical Processing Plants: 化工装置中需要避免执行器受热的场合。

长轴气动球阀总结 (Summary)

长轴气动球阀通过其独特的设计，有效解决了特殊安装环境对自动化阀门提出的挑战，实现了稳定性、安全性与自动化控制的很好结合。选型时需重点关注延伸轴长度、执行器工作温度等级、阀体材质及密封形式。