化工阀门的死腔可能积料，造成卡滞和密封失效。XOMOX Tufline三级顶部密封旋塞阀采用无死腔、平滑通道及多重密封，用于废污泥、石灰泥浆、含锌粉末硫酸等粘稠或腐蚀介质。
无死腔结构
平滑贯通的流道减少粘稠及沉淀物料积聚，适用于碳酸钙浆液、明矾、绿液、未处理江河水及磷酸浆液，有助于减少清洗频次与交叉污染。
三级密封
- 一级由旋塞、衬套和阀体构成，隔离介质与大气。
- 二级由PTFE膜片和金属膜片构成；PTFE楔形环提供径向力，使膜片紧贴阀杆。
- 三级采用封闭柔性石墨阀杆密封及阀体、阀盖连接处的石墨密封圈。外部金属膜片压紧静密封环，增强阀体与阀盖密封。
原技术页说明，紧凑的专利结构利用动态密封力，配合金属包覆柔性石墨组件控制外漏。
防火与外漏控制
原文引用API 607第四版4.2节，并称其外漏测试性能超过该版要求。防火安全应用应采用带放空的旋塞。
介质与配置
典型介质包括废污泥、石灰泥浆、含锌粉末硫酸、碳酸钙浆液、明矾、纯碱、盐水、绿液、磷酸浆液及未处理江河水。可选两通、三通、四通，部分夹套或全夹套；端部支持螺纹、法兰、承插焊和对焊；口径½–24英寸，压力ANSI Class 150/300/600。
产品规格表
| 参数 | 原文选项 |
|---|
| 口径 | ½–24 inches |
| 通路 | Two-way, three-way or four-way |
| 夹套 | Partial or full jackets available for applicable two-, three- and four-way configurations |
| 端部连接 | Threaded, flanged, socket-weld or butt-weld |
| 压力等级 | ANSI Class 150, 300 or 600 |
In chemical service, internal dead spaces can trap material, obstruct valve movement and impair sealing. The XOMOX Tufline plug valve combines a cavity-free passage with a three-stage top-sealing system for viscous and corrosive media, including waste sludge, lime slurry and sulfuric acid containing zinc powder.
Cavity-free flow path
The smooth, continuous passage is designed to prevent viscous or settling material from accumulating and blocking the valve. Applications discussed include calcium-carbonate slurry, alum, green liquor, untreated river water and phosphoric-acid slurry. Avoiding trapped material during operation can reduce cleaning and maintenance requirements and the risk of cross-contamination.
Three-stage top sealing
The sealing arrangement provides successive barriers between the process medium and the atmosphere.
- Primary seal: the plug, sleeve and body form the basic sealing layer.
- Secondary seal: a PTFE diaphragm and metal diaphragm provide an additional barrier. A PTFE wedge ring applies radial force so that the diaphragm seals around the stem.
- Tertiary seal: an enclosed flexible-graphite stem seal and a graphite bonnet gasket at the body–bonnet joint provide the final barrier against external leakage. The outer metal diaphragm bears on a static graphite seal to reinforce sealing between the body and bonnet.
The original technical sheet describes a compact patented system that uses dynamic sealing forces, with a metal-encapsulated flexible-graphite stem-seal assembly.
External leakage and fire-safe construction
The article states that the three-stage top-sealing option is intended to meet demanding external-leakage requirements. Its cited fire-test reference is API 607, fourth edition, section 4.2; the source describes performance exceeding that edition’s external-leakage test requirements. For applications requiring fire-safe service, the sheet specifies a vented plug.
Typical media and configurations
- Waste sludge, lime slurry and sulfuric acid containing zinc powder: high solids content and aggressive corrosion.
- Calcium-carbonate slurry, alum and soda ash: crystallizing or viscous service.
- Brine, green liquor and phosphoric-acid slurry: acidic or alkaline and conductive media.
- Untreated river water: suspended solids and other impurities.
| Parameter | Published options |
|---|
| Nominal size | ½–24 inches |
| Flow arrangement | Two-way, three-way or four-way |
| Jacket | Partial or full jackets available for applicable two-, three- and four-way configurations |
| End connections | Threaded, flanged, socket-weld or butt-weld |
| Pressure class | ANSI Class 150, 300 or 600 |
The original cutaway identifies the metal inner and outer rings, PTFE diaphragm and wedge ring, adjustment bolt, bonnet, metal diaphragm, body, flexible-graphite bonnet gasket, plug, PTFE sleeve and enclosed flexible-graphite stem seal.
