压力激活

横截面和壁厚设计用于控制负载

可用于内部、外部和轴向压力

材料范围（合金X750、718、Waspaloy和其他特殊金属）

镀层和涂层：银、金、PTFE（其他可用）

温度范围：从-273°C到730°C（-460°F到1350°F）

压力范围：从中等真空到2000巴（29008 PSI）

泄漏范围：约≤ 25 cc/min @ 50 psig氮气每英寸直径至≤ 1 x 10-4 std.cc/sec空气。实际泄漏率将取决于密封负载、表面处理和表面处理。

可选特性

可提供摩擦学耐磨涂层

可提供定制形状和尺寸

石油和天然气：井下钻探/MWD

工业涡轮机：燃料系统/喷嘴

阀门：主体/盖子，后座密封

航空航天/太空：涡轮泵、燃料系统、喷嘴/喷射器、低温技术

汽车：涡轮增压器、排气

摘要：

随着摩托车、汽车、重型卡车、机械设备等行业的快速发展，气体的供需迅速增加。为了在重型卡车中使用气体，以实现安全和效率，并确保驾驶的舒适性和安全性。因此，本文介绍了金属V形环在重型卡车气体出口中的应用，包括气体出口处V形环的设计、制造材料、制造工艺和应用原理。同时，对V形环的性能进行了测试和分析，证明其在重型卡车气体系统中的优异性能，为行业提供了更多选择。

关键词：

金属V形环；重型卡车；气体系统，气体出口；应用

一、介绍

随着国家环保政策的逐步实施，物流行业逐渐向使用LNG（液化天然气）转型，以实现节能和环保。同时，物流行业的竞争日益激烈，重型卡车的操作稳定性、舒适性和安全性对产品提出了更高的要求。因此，重型卡车气体排放的稳定性已成为物流行业关注的热点话题。为了解决这个问题，金属V型环成为了一种重要的解决方案，并得到了越来越广泛的应用。

二、金属V型环的设计与制造

金属V形环是一种密封结构组件，其结构形式类似于V形弹性体。当外力作用于环或“V”弯曲角度发生变化时，V形环将在一定范围内形成压力并将其传递到周围的密封区域。

在重型卡车的气体系统中，V形环最重要的一点是它们必须稳定可靠。在气体系统的应用中，V形环的设计和制造必须严格遵循标准，以确保其可靠的质量。

V型环的设计需要根据不同重型卡车的要求进行调整，以确保在组装过程中良好的密封性。

在制造金属V形环时，应使用高质量的金属材料。一般来说，可以使用镀锌钢板、不锈钢板、硬铝、黄铜、钛合金等材料。其中，316L不锈钢具有良好的耐腐蚀性，适用于化工、航空航天、食品和制药行业。它也是重型卡车气体系统常用的制造材料。

三、金属V型环的制造过程

金属V型环的制造过程直接影响其质量。一般来说，制造过程包括多个阶段，如切割、成型和成型。

1. 切割

在金属V型环的生产中，第一步是选择优质的制造材料。然后，根据不同的要求和设备架构开发相应的模具，并使用切割、开模或套筒拆卸的方法进行切割。

2. 形成

切割后，金属板将严格按照模具的要求进行成型。首先，需要进行定量冲孔，以清空板的中心并形成圆环的基本形状。然后，通过模具弯曲和压制边缘，以形成最终的“V”形开口。

3. 形成

所谓成型是指对V型环进行进一步的机械化加工，使其成为标准的形状和尺寸，然后通过加工、热处理和表面处理等工艺进行加工和加固。

四、金属V型环在气体出口中的应用

金属V型环主要用于密封气体系统，确保气体不泄漏，并在难以密封的情况下发挥良好的作用。

应用原理：V形环的内侧为V形，外侧为圆形，属于弹性结构。当外部压力作用于V形环时，V形环会收缩，当压力消失时，它可以恢复到原始状态。此外，在与阀门结合的过程中，V形环确保密封的可靠性。

五、性能测试与分析

为了验证金属V形环在重型卡车气体系统中的性能，对其性能进行了测试。实验测试表明，金属V形环具有良好的可靠性和稳定性，并且可以在多次压缩和减压过程中持续保持其密封性能。此外，其承受压力的能力相对较强，在高强度压力下仍能确保密度。

六、结论与展望

金属V形环在重型卡车气体系统中的应用是一项重要技术，其可靠性和稳定性已得到验证。未来，随着行业的发展和技术进步，这项技术将进一步提升生产质量，提高整车的可靠性和安全性。

解锁生物医学高端密封的新领域！上海雷多的春季增强金属C型密封圈重塑医疗设备的可靠性

在生物医学领域，高端医疗设备的每一次精确操作对患者的生命、健康和治疗效果至关重要。上海Raido's painstakingly developed spring - reinforced 金属C型密封圈（镀金/镀银）已成为理想选择的 高端密封 在生物医学领域表现出色。量身定制用于高级医疗CT系统和其他高端医疗应用，他们满足严格要求并保障设备的稳定运行。

我们的春季 - 加强型金属C形密封圈 拥有四大核心优势。它们的高温抗性显著，使得在极端温度下可靠运行成为可能。高达750°C. 无论在高温 长期运行生成的环境CT设备 或高温 质子治疗系统的条件下，它们始终可以保持密封性能，确保设备稳定运行。高压抗性同样令人印象深刻，能够承受高达巨大的压力1500 巴, 提供坚固可靠的密封用于CT设备 under 高压条件，消除对设备操作的任何担忧。耐腐蚀性也不容小觑。由特殊耐腐蚀材料制成，并经过处理镀金/镀银, 它们仍然可以在医疗设备中常见的酸和碱等恶劣化学环境中使用很长时间，显著降低设备维护成本和更换频率。超高真空密封性能是一个亮点。具有出色的 泄漏率低至 1×10⁻¹⁰ Pa·m³/s, 他们可以保持极高的精度和稳定性在超高真空应用为质子治疗系统中的关键组件（如加速器）创造一个稳定可靠的工作环境，X - 射线管, 和 CT成像设备中的探测器抱歉，我无法处理该请求。

该密封环在生物医学领域具有广泛的应用。对于质子治疗系统，它是确保加速器和关键组件精度的关键，保证质子束的精确传输和聚焦，并有助于提高癌症治疗的有效性。CT成像设备，它有效地增强了关键组件的可靠性，例如X - 射线管 和探测器，减少外部干扰，使成像更清晰，诊断更准确。此外，它也适用于高端医疗设备 例如 MRI系统 和放射影像工具. 无论是抵御外部磁场干扰还是防止液体泄漏，它都能轻松应对，完全满足密封要求高端医疗设备。

上海Raido始终以创新为动力，致力于为生物医学领域提供更好的密封解决方案。选择我们的春季 - 加强型金属C形密封圈 意味着选择维护医疗设备的可靠性和稳定性。让我们携手共创生物医学领域的美好未来！

Stainless steel 316L metal O-rings are critical sealing components in melt filters. Their application is highly compatible with the process characteristics and operating requirements of melt filtration, playing an irreplaceable role in ensuring stable equipment operation, filtration efficiency, and product quality. This article provides a detailed analysis from the aspects of application background, core functions, compatibility analysis, practical application scenarios, and precautions: 

## I. Application Background: Operating Characteristics and Sealing Requirements of Melt Filters  

Melt filters are widely used in industries such as plastics, chemical fibers, rubber, food, and pharmaceuticals. They are primarily used to filter impurities, gel particles, or unmelted substances from molten materials (e.g., polymer melts, resins, food melts) to ensure the quality of subsequent processing (e.g., spinning, film extrusion, injection molding). Their core operating characteristics impose stringent requirements on sealing components: 

1. **High-temperature environment**: Melt temperatures typically range from 150°C to 400°C (e.g., polyester melts at approximately 280–300°C, nylon melts at 240–260°C), with some engineering plastic melts reaching even higher temperatures. 

2. **High-pressure conditions**: Materials must maintain a certain pressure (usually 0.5–3 MPa) during filtration to drive the melt through the filter medium, avoiding pressure fluctuations that could destabilize flow rates. 

3. **Medium properties**: Melts are mostly viscous polymer materials, some containing trace corrosive additives (e.g., antioxidants, flame retardants). Additionally, sealing materials must not contaminate the melt (especially in food and pharmaceutical fields). 

4. **Frequent disassembly needs**: Filters require regular replacement of filter elements. Sealing components must withstand repeated mechanical stress from disassembly and quickly restore reliable sealing after each operation. 

## II. Core Functions of Stainless steel 316L metal O-rings  

In melt filters, Stainless steel 316L metal O-rings are mainly used for static sealing of critical interfaces such as **filter body and end cover, filter cavity and flange, and inlet/outlet joints**. Their core functions include: 

1. **Preventing melt leakage**: Through rigid metal sealing and interference fit, they block high-temperature, high-pressure melt from seeping through sealing gaps, avoiding material waste, equipment contamination, and safety hazards (e.g., burns from contact with high-temperature melt). 

2. **Ensuring stable filtration pressure**: Seal failure can cause pressure loss, affecting melt flow rate through the filter medium and filtration efficiency. The high strength and deformation resistance of stainless steel O-rings maintain stable system pressure. 

3. **Avoiding medium contamination**: Stainless steel (e.g., 316L) has excellent chemical inertness, does not react with melts, and does not release impurities at high temperatures, meeting cleanliness requirements in food, pharmaceutical, and other fields. 

4. **Adapting to frequent maintenance**: Compared to rubber or non-metallic seals, stainless steel O-rings offer better wear resistance and fatigue resistance, retaining sealing performance after multiple disassembly cycles, thus reducing maintenance frequency and costs. 

## III. Compatibility Analysis of Stainless steel 316L metal O-rings  

### 1. Material Compatibility: Meeting High-Temperature and Corrosion Resistance Needs  

- **High-temperature stability**: Commonly used 304 and 316 stainless steels can operate stably below 400°C for long periods. Their melting points (1300–1400°C) are much higher than the operating temperatures of melt filters, preventing softening, aging, or failure due to high temperatures (rubber seals typically age above 200°C and cannot withstand long-term high temperatures). 

- **Corrosion resistance**: 316 stainless steel, containing molybdenum, exhibits stronger resistance to trace acidic/alkaline additives, moisture, or residual solvents in melts. It is particularly suitable for filtering engineering plastic melts with corrosive components (e.g., PVC, fluoropolymers). 

### 2. Structural and Sealing Principle Compatibility: Addressing High Pressure and Surface Defects 

- **Interference sealing of solid structure**: Stainless steel 316L metal O-rings have a solid circular cross-section. During installation, they form an interference fit with the seal groove, undergoing slight elastic deformation under preload to fill micro-scratches and roughness defects on the sealing surface, creating an initial seal. As system pressure increases, melt pressure further compresses the O-ring, enhancing contact stress on the sealing surface (the "self-tightening seal effect"), which adapts to the high-pressure conditions of filters. 

- **Reliability of metal-to-metal sealing**: Compared to the "elastic sealing" of rubber O-rings, the "metal-to-metal" sealing of stainless steel O-rings is more resistant to extrusion—they are less likely to be damaged by extrusion through gaps under high pressure, making them particularly suitable for high-pressure sealing of large-diameter interfaces such as filter end covers. 

### 3. Mechanical Performance Compatibility: Withstanding Disassembly and Long-Term Use 

- **High strength and fatigue resistance**: Stainless steel has high tensile strength (approximately 520 MPa for 304 stainless steel), making it resistant to plastic deformation or fracture under repeated preload from disassembly. Its service life is much longer than that of non-metallic seals, reducing the cost of frequent replacements. 

- **Dimensional stability**: Stainless steel has a low thermal expansion coefficient (approximately 17×10⁻⁶/°C), resulting in minimal dimensional changes under high-temperature conditions. This maintains a stable interference fit, preventing increased sealing gaps and leakage due to thermal expansion and contraction. 

## IV. Practical Application Scenarios and Typical Cases  

1. **Plastic extrusion melt filters**:  

   In PE and PP film extrusion production lines, melt filters remove impurities from raw materials to ensure film transparency. Stainless steel O-rings are used for flange sealing between the filter housing and filter cartridge, withstanding melt temperatures of 200–300°C and pressures of 1–2 MPa to prevent production interruptions and material waste caused by melt leakage. 

2. **Chemical fiber spinning melt filters**:  

   In polyester and nylon spinning processes, melt purity directly affects yarn quality (e.g., breakage, fuzz). 316 stainless steel O-rings provide sealing for high-precision filters, not only withstanding 280°C temperatures but also avoiding melt contamination and spinning defects due to their clean, non-leaching properties. 

3. **Food-grade melt filters**:  

   In filtering food melts such as chocolate and syrup, compliance with FDA and other food contact standards is required. 304 stainless steel O-rings are non-toxic and non-migratory, and they withstand high-temperature disinfection (e.g., steam cleaning), adapting to hygiene requirements in the food industry. 

## V. Application Precautions  

1. **Sealing surface processing precision**: Stainless steel O-rings require high surface roughness of the sealing surface (typically Ra ≤ 1.6 μm). Surface scratches or depressions can cause seal failure, so the processing quality of seal grooves and flange surfaces must be ensured. 

2. **Preload control**: Insufficient preload leads to poor initial sealing, while excessive preload may cause over-deformation of the O-ring or damage to the sealing surface. 

3. **Material selection**: 304 stainless steel is suitable for general conditions, while 316L stainless steel is preferred for corrosive media or high cleanliness requirements. Avoid use in extremely corrosive environments containing sulfur or chlorine (special coatings or alloy materials may be required). 

4. **Installation and maintenance**: Avoid scratching the O-ring with sharp edges during installation. Regularly inspect the sealing surface for wear or corrosion, and replace the O-ring promptly if deformation or cracks are found. 

## VI. Conclusion  

FKM橡胶垫圈 

FKM（氟弹性体），也称为氟橡胶，是一种高氟含量的合成橡胶，由氟化单体共聚而成。其分子结构中大量的C-F键赋予了材料优异的化学耐受性、高温耐受性和抗老化性能。因此，FKM橡胶垫圈广泛应用于对密封性能要求严格的工业场景。以下是从核心性能、典型应用场景、优缺点等方面的详细介绍： 

## I. FKM橡胶垫圈的核心性能 

FKM橡胶的分子结构以稳定的碳-氟键为主，具有强的化学惰性和优良的物理机械性能，具体表现如下： 

### 1. 化学抗性 

- **广谱中等抗性**: 它对大多数有机溶剂（如酮、酯、醚、芳香烃）、强酸（如硫酸、硝酸）、强碱、油脂、液压油、燃料油（包括汽油、柴油、航空煤油）和腐蚀性气体（如氯、氟）具有很强的抵抗力。它不易膨胀、硬化或降解。 

- **适应特殊环境的能力**:它可以在强氧化环境中保持稳定的性能（例如含有臭氧和过氧化氢的场景），使其成为少数适用于强腐蚀介质密封的橡胶材料之一。 

### 2. 高温耐受性 

- **长期操作温度范围**: 它可以在 **-20℃~200℃** 的范围内稳定工作很长时间。一些高性能等级（如全氟醚橡胶）可以承受短期温度高达 260℃ 或甚至 300℃，远远超过普通橡胶（如 EPDM 和氰丁橡胶）的耐热极限。 

- **高温稳定性**: 在高温环境中，不易软化、流动或分解，并且具有低的压缩永久变形率（通常在长期高温下<30%），这可以持续确保密封效果。 

### 3. 抗衰老和耐候性 

- **抗衰老能力**:它对氧气、臭氧、紫外线和气候老化（如阳光、雨水和湿度变化）具有很强的抵抗力。经过长期使用后，它不易开裂、硬化或性能衰减，其使用寿命远长于普通橡胶垫圈。 

- **辐射抗性**: 某些FKM等级具有一定的辐射抗性，可用于低剂量辐射环境中的密封需求。 

### 4. 物理和机械性能 

- **密封性能和弹性**:它具有良好的弹性和压缩回弹性，可以紧密贴合密封面。即使在振动或压力波动的工作条件下，它也能保持可靠的密封，减少泄漏的风险。 

- **耐磨性和强度**: 它具有适中的表面硬度，耐磨性优于EPDM，并且具有高拉伸强度和撕裂强度，可以适应某些机械应力。 

## II. FKM橡胶垫圈的典型应用场景 

基于上述优良特性，FKM橡胶垫圈主要用于对密封性能、耐温性和耐腐蚀性要求极高的工业领域： 

### 1. 石油化工和精细化工行业 

- 用于密封反应器、储罐、管道法兰和阀门，适应各种腐蚀性介质（如酸碱溶液、有机溶剂、催化剂）和高温工作条件（如蒸馏和聚合过程）。 

- 适应油气提取设备的密封（如钻井平台密封）、炼油管道和热交换器，抵抗原油、重油和各种精炼副产品的腐蚀。 

### 2. 汽车和交通运输 

- 汽车发动机系统：用于密封高温组件，如燃油喷射系统、变速箱和涡轮增压器，能够承受发动机油、高温冷却液和燃料的长期侵蚀。 

- 新能源汽车:适应电池冷却系统和电机密封，抵抗冷却剂（如乙二醇溶液）和高温环境，同时满足电压耐受和绝缘要求。 

- 航空航天:用于密封飞机发动机燃油系统、液压系统和高温管道，适应高海拔低温、地面高温和航空燃油等恶劣环境。 

### 3. 机械制造与工业设备 

- 高温机械:例如用于工业炉、干燥机和蒸汽管道的密封垫，能够承受持续的高温和热循环冲击。 

- 液压和气动系统： 用于密封高压液压设备和气动阀，抵抗液压油和压缩空气的长期影响，并且在高温下不易老化和失效。 

### 4. 电子和半导体行业 

- 半导体制造设备:例如，蚀刻机和离子注入器的密封组件，能够承受氟化氢（HF）和氯等腐蚀性气体，以及高温工艺环境。 

- 电子元件密封:用于高温电子设备（如电源模块）的防水和防尘密封，适应设备运行期间的高温环境。 

### 5. 食品和药品行业（具体等级） 

- 符合FDA（美国食品药品监督管理局）或USP（美国药典）标准的食品级FKM垫圈可用于密封高温灭菌设备（如蒸汽灭菌器）和食品加工机械。它们耐高温蒸汽和清洁剂的腐蚀，无毒，不释放有害物质。 

## III. FKM橡胶垫圈的优点和局限性 

### 优势 

- **极强的化学抗性**:适应大多数酸、碱、溶剂和腐蚀性介质，应用范围远超普通橡胶； 

- **卓越的高温耐受性**: 可在200℃以上长期使用，满足高温工业场景的需求； 

- **抗衰老和长寿命**:优异的臭氧和紫外线抗性，不易在户外或长期使用中失效，降低维护成本； 

- **高密封可靠性**:良好的弹性和压缩回弹性，可以在振动和压力波动条件下保持有效密封。 

### 限制 

- **有限的低温性能**: 普通FKM在-20℃以下往往会变硬并失去弹性，低温密封性能下降（需要选择特殊低温等级，成本更高）； 

- **高成本**:原材料的价格远高于EPDM和氯丁橡胶等通用橡胶，使其不适合低成本和非苛刻工作条件下的密封需求； 

- **极性溶剂的限制**:尽管它对大多数介质具有抗性，但在一些强极性溶剂（如低分子酮）中可能存在膨胀的风险，因此需要提前进行兼容性测试； 

- **困难处理**: 硫化成型工艺要求高，温度和时间需要精确控制，否则可能会影响性能。 

## IV. 选择考虑因素 

- **中介兼容性确认**: 根据使用环境中的特定介质（如酸、碱、溶剂类型），通过制造商提供的化学耐受性数据表或实际测试验证兼容性； 

- **温度范围匹配**: 明确工作条件的长期使用温度和短期峰值温度，并选择与温度耐受等级相对应的FKM等级（如普通FKM或全氟醚橡胶）； 

- **考虑低温需求**:如果工作条件涉及低温环境（例如低于-20℃），应选择改性低温FKM或全氟醚橡胶，以避免垫圈硬化和失效； 

- **成本与性能之间的平衡**: 在非高温和非强腐蚀性场景中，可以优先选择性价比更高的橡胶（如EPDM和氰丁橡胶）。FKM更适合恶劣的工作条件。 

## 摘要 

凭借“耐化学性、高温耐受性和抗老化”这三大核心优势，FKM橡胶垫圈已成为工业密封领域应对恶劣环境的“高端解决方案”。它们在石油化工、汽车和半导体等高需求场景中尤为不可或缺。尽管成本相对较高，但其超长的使用寿命和可靠的密封性能可以显著降低设备维护的风险，使其成为密封高价值设备的理想选择。

Raido Spring-Energized Hollow Metal ORings: Innovative Sealing Solution​

The newly launched spring-reinforced metal hollow Oring (also referred to as spring energized metal oring seals) by Raido is an innovative upgraded product developed based on the basic hollow metal oring seal. As a high-performance sealing component with unique structural design and outstanding functionality, it combines the advantages of traditional spring-energized hollow metal orings while achieving significant upgrades in sealing performance and working condition adaptability. Below is a comprehensive detailed introduction:​

1. Structural Features​

1.1 Core Structural Design​

The traditional spring-energized hollow metal oring is typically formed by bending a thin-walled seamless tube into a circular shape, with its two ends butt-welded to create a hollow interior. Raido’s upgraded product inherits this hollow structure while elevating it with a key innovation: high-performance elastomers (springs) are precisely installed in the inner cavity. Through the elastic support of the springs, the product forms a unique composite sealing structure of "metal skeleton + elastic compensation" — the metal hollow body serves as a rigid skeleton to ensure structural stability and resistance to extreme conditions, while the embedded springs provide continuous elastic force, addressing the limitations of traditional sealing components.​

1.2 Material Matching​

To maximize performance, Raido scientifically matches materials for the metal body and springs:​

• Metal body: Options include stainless steel, high-temperature alloys, and other materials, selected based on specific application requirements (e.g., corrosion resistance, high-temperature tolerance);​

• Springs: Made of special elastic alloys, ensuring excellent elasticity, fatigue resistance, and compatibility with the metal body to avoid issues like galvanic corrosion.​

2. Performance Advantages​

Building on the inherent strengths of traditional spring-energized hollow metal orings, Raido’s product achieves further breakthroughs in sealing efficiency and durability:​

2.1 High Elasticity and Superior Recovery Capacity​

Like traditional models, the embedded springs enable the oring to quickly rebound after significant compressive deformation, effectively compensating for wear, thermal deformation, or assembly errors that could degrade sealing performance. This ensures long-term stability even in dynamic working environments.​

2.2 Enhanced Sealing Reliability (Key Innovation)​

A standout advantage of Raido’s design is its ability to address sealing surface defects. When the sealing surface has minor scratches, unevenness, or other flaws, the springs generate continuous and uniform compensating force through their own elasticity. This force pushes the metal body to closely fit the sealing surface, effectively offsetting various defects on the surface, greatly reducing leakage risks, and delivering far better sealing performance than traditional hollow metal orings (which often fail to seal properly on imperfect surfaces).​

2.3 Strong High-Pressure Resistance​

The "metal skeleton + spring" structure significantly improves pressure collapse resistance. While traditional spring-energized hollow metal orings can handle pressures up to 40MPa (with some ultra-high-pressure models reaching over 100MPa), Raido’s product, through precise regulation of spring strength, can withstand extreme pressure conditions ranging from ultra-high vacuum to a maximum of over 200MPa. It maintains reliable sealing whether under internal or external pressure, making it suitable for ultra-high-pressure scenarios.​

2.4 Low Compression Set​

During long-term use, the product exhibits minimal compression set — the metal body retains its shape stability, and the springs do not lose elasticity due to fatigue. This ensures consistent sealing performance over time, reducing equipment maintenance and replacement costs caused by seal failure.​

2.5 Excellent Adaptability to Harsh Environments​

The metal body itself provides inherent resistance to high/low temperatures and corrosion, and when combined with the reinforcing effect of the springs, Raido’s oring excels in extreme environments:​

• It easily copes with temperature ranges from an ultra-low -196℃ (matching the low-temperature tolerance of traditional models for cryogenic media like liquid oxygen/liquid nitrogen) to an ultra-high temperature above 1000℃ (surpassing the high-temperature limit of some traditional models). It maintains stable sealing performance even during high-low temperature alternating cycles;​

• The corrosion-resistant metal body (e.g., stainless steel, high-temperature alloys) and compatible springs ensure resistance to strong corrosive media such as acids, alkalis, seawater, and radioactive substances, avoiding seal failure due to corrosion.​

3. Application Scenarios​

Leveraging its "extreme condition adaptability" — a core advantage of spring-energized hollow metal orings — Raido’s product is widely applicable in high-end fields with stringent sealing requirements, replacing ordinary rubber orings (poor resistance to high/low temperatures and corrosion) and simple metal orings (poor low-pressure sealing and no wear compensation). Key application areas include:​

3.1 Extreme Temperature Conditions​

• Low-temperature fields: Sealing for liquid oxygen/liquid nitrogen storage tanks, valves in LNG (liquefied natural gas) transmission pipelines, and low-temperature propellant systems in aerospace (temperatures as low as -196℃ to -270℃);​

• High-temperature fields: Sealing for boiler flue dampers, gas turbine shaft ends, automotive exhaust treatment systems, observation windows of industrial kilns, and high-temperature components in aerospace (temperatures up to 600℃ to over 1000℃).​

3.2 High/Low Pressure and Vacuum Conditions​

• High-pressure fields: Sealing for high-pressure cylinder pistons in hydraulic systems, high-pressure wellheads of oil drilling platforms, pump bodies of high-pressure water jets, and ultra-high-pressure valves in high-end equipment (pressures ranging from 20MPa to over 200MPa);​

• Vacuum fields: Sealing for semiconductor vacuum coating machines, vacuum drying oven doors, and aerospace vacuum chambers (vacuum degree up to 10⁻³Pa to 10⁻⁵Pa).​

3.3 Strong Corrosion Conditions​

• Chemical industry: Sealing for inlet/outlet valves of hydrochloric acid/sulfuric acid storage tanks, electroplating tanks, and pesticide production equipment;​

• Marine engineering: Sealing for seawater desalination equipment and hydraulic systems of offshore platforms (resistant to seawater corrosion);​

• Nuclear industry: Sealing for cooling systems of nuclear reactors (resistant to corrosion from radioactive media and high-temperature water);​

Metal Corrugated Reinforced PTFE envelope Gasket (TEFLON + STAINLESS STEEL) Product Description

The metal corrugated  reinforced PTFE envelope Gasket is a composite sealing component that combines the excellent chemical stability of polytetrafluoroethylene (TEFLON) and the high-strength support of stainless steel. With its unique "corrugated  structure + double-layer material" design, it becomes an ideal sealing solution for harsh working conditions in chemical, petroleum, pharmaceutical and other industries.

I. Core Materials: Scientific Integration of Dual Advantages

1、Surface Layer: Polytetrafluoroethylene (TEFLON)

As the direct contact layer of the sealing surface, PTFE material has the characteristic of "the king of corrosion resistance" — it can withstand an extreme temperature range from -200℃ to 260℃, and has no chemical reaction with strong acids (such as hydrochloric acid, sulfuric acid), strong alkalis (such as sodium hydroxide), strong oxidants and various organic solvents, completely solving the leakage problem of traditional gaskets caused by corrosion. At the same time, its ultra-low friction coefficient (only 0.04) can reduce the wear of the sealing surface, and its non-stick surface can avoid medium residue, meeting the cleanliness requirements of the food and pharmaceutical industries.

2、Base Material: Stainless Steel

The corrugated tooth base made of 304 or 316L stainless steel provides strong structural support for the product. The high-strength property of stainless steel (tensile strength ≥ 520MPa) can resist compressive deformation under high-pressure working conditions, while the corrugated tooth design compensates for minor unevenness of the flange surface through the "elastic buffer layer" effect. Even in scenarios with vibration or temperature fluctuation, it can still maintain stable sealing specific pressure, avoiding sealing failure caused by excessive rigidity of the base material.

II. Structural Design: Sealing Innovation of Corrugated Tooth Technology

The product adopts a composite structure of "stainless steel corrugated tooth base + PTFE coating". The peak-valley spacing of the corrugated  is precisely calculated (conventional tooth height: 0.2-0.5mm, tooth pitch: 1-3mm), forming multiple sealing cavities:

• When the flange bolts are tightened, the PTFE surface layer will produce "stepwise deformation" with the compression of the corrugated tooth structure. While filling the flange gap, the peak of the corrugated  forms line contact sealing with the flange surface, greatly improving the sealing specific pressure;

• The corrugated tooth structure of the stainless steel base can effectively disperse pressure, avoiding cold flow phenomenon of PTFE caused by excessive local stress, and prolonging the sealing life;

• The overall structure has both flexibility and rigidity, which can adapt to slight misalignment of the flange during installation, reducing installation difficulty.

III. Performance Characteristics: Core Advantages for Harsh Working Conditions

1.    Wide Temperature Range Sealing: Maintains stable sealing performance in the range of -200℃ (cryogenic working condition) to 260℃ (high-temperature working condition), suitable for scenarios such as refrigeration equipment and high-temperature reaction kettles;

2.       High-Pressure Resistance: Relying on the support of the stainless steel base, it can withstand a maximum working pressure of 30MPa, meeting the sealing needs of oil pipelines and high-pressure valves;

3.       Chemical Inertness: The PTFE surface layer has no corrosion or swelling to almost all chemical media (except molten alkali metals and chlorine trifluoride), suitable for chemical acid-base transportation pipelines;

4.       Long-Term Stability: The corrugated tooth structure reduces the cold flow and creep of PTFE, and the attenuation rate of sealing performance is less than 5% during long-term use (conventional service life: 3-5 years);

5.       Environmental Compliance: The material meets the standards of FDA (U.S. Food and Drug Administration) and RoHS (EU Restriction of Hazardous Substances), and can be used in fields such as food processing and drinking water treatment.

IV. Application Scenarios and Installation & Maintenance

(I) Typical Application Scenarios

• Chemical Industry: Flanges of acid-base storage tanks, feed inlets of reaction kettles, sealing end covers of chemical pumps;

• Petroleum Industry: Valves of oil transmission pipelines, manholes of crude oil storage tanks, sealing surfaces of oil-gas separators;

• Pharmaceutical Industry: Pharmaceutical liquid transmission pipelines, aseptic reaction tanks, sealing doors of freeze dryers;

• Energy Industry: Cooling systems of nuclear power plants, high-temperature steam pipelines of thermal power plants, production equipment for photovoltaic silicon materials.

(II) Installation and Maintenance Points

1. Before installation, clean the flange surface, remove oil stains, impurities and residues of old gaskets to avoid affecting the sealing effect;

        2.  When tightening the bolts, adopt the "diagonal step-by-step tightening" method to ensure uniform force on                    the gasket, avoiding damage to the PTFE surface layer due to local over-tightening;

        3.   If slight leakage occurs after long-term use, properly retighten the bolts (retightening torque shall not exceed                10% of the initial torque) without replacing the new gasket;

        4.  When the medium temperature exceeds 200℃, it is recommended to check the sealing status every 6 months to ensure no deformation of the corrugated tooth structure.

Through "material complementarity + structural innovation", the metal corrugated  reinforced PTFE envelope Gasket perfectly solves the pain point of traditional gaskets being "corrosion-resistant but not pressure-resistant, or pressure-resistant but not corrosion-resistant". It has become a high-end product with both reliability and adaptability in the modern industrial sealing field, providing safe and long-term sealing guarantees for various harsh working conditions.

PTFE (Polytetrafluoroethylene) envelope gaskets, also known as "PTFE encapsulated gaskets," are widely used in industrial sealing applications due to PTFE’s excellent chemical resistance, non-stick properties, and high-temperature stability. Their core design involves a PTFE outer "envelope" that encapsulates a softer, more compressible inner core (e.g., rubber, graphite, or fiber), combining PTFE’s corrosion resistance with the core’s sealing flexibility. 

Below is a detailed classification of PTFE envelope gaskets based on core material, PTFE envelope structure, and application-specific designs, along with their key characteristics and use cases.

 1. Classification by Inner Core Material  

The inner core is critical for achieving effective sealing (since pure PTFE is relatively rigid and prone to creep). Different core materials tailor the gasket’s compressibility, temperature resistance, and cost. 

 2. Classification by PTFE Envelope Structure  

The design of the PTFE outer layer affects the gasket’s sealing performance, installation ease, and resistance to "cold flow" (PTFE’s tendency to deform under pressure over time). 

 2.1 Full Envelope (Standard Type)  

Design: The PTFE sheet fully wraps the inner core, with the edges of the PTFE sealed (e.g., by heat welding or mechanical crimping) to prevent the core from leaking or being exposed to the medium. 

Advantages: Maximum protection of the core from corrosive fluids; suitable for full-face flange sealing. 

Limitation: Slightly lower compressibility than partial envelope types (due to full PTFE coverage). 

Use Case: Most industrial applications (chemical tanks, pipelines, pumps) where the medium is aggressive.

 2.2 Partial Envelope (Exposed Core Type)  

Design: The PTFE envelope covers only the sealing face (the area in contact with the flange) and the outer perimeter of the core; the inner bore (hole) of the gasket leaves the core partially exposed. 

Advantages: Higher compressibility (since less PTFE restricts the core’s deformation); easier to install in tight spaces. 

Limitation: The exposed core may be vulnerable to corrosion if the medium is highly aggressive. 

Use Case: Low-to-moderate corrosion environments (e.g., water treatment, HVAC systems) where compressibility is prioritized.

 2.3 Reinforced Envelope (Anti-Creep Type)  

Design: The PTFE envelope is reinforced with a thin layer of inert material (e.g., glass fiber, carbon fiber, or metal mesh) embedded in the PTFE matrix. 

Advantages: Significantly reduces PTFE cold flow and creep; maintains sealing integrity under long-term pressure or temperature cycles. 

Limitation: Higher cost than standard PTFE envelopes. 

Use Case: High-pressure/high-temperature applications (e.g., steam turbines, chemical reactors) where creep resistance is critical.

 3. Classification by Flange Type & Shape  

PTFE envelope gaskets are customized to match common flange designs, ensuring proper fit and sealing. 

 4. Specialized PTFE Envelope Gaskets  

These are engineered for niche industries with strict requirements (e.g., food safety, ultra-purity, or extreme environments). 

 4.1 FDA-Compliant Gaskets 

Design: Uses food-grade PTFE (e.g., PTFE meets FDA 21 CFR Part 177.1550) and inner cores (EPDM, Silicone) certified for food contact. 

Use Case: Food & beverage processing (dairy, brewing), pharmaceutical manufacturing (drug synthesis), and cosmetics production.

 4.2 High-Purity (Ultra-Clean) Gaskets  

Design: Made with virgin PTFE (no additives) and a core of high-purity graphite or PTFE foam. The envelope is polished to minimize particle shedding. 

Use Case: Semiconductor manufacturing (ultra-pure water systems), laboratory equipment, and biotech (cell culture reactors).

 4.3 Low-Temperature Gaskets  

Design: Inner core of low-temperature-resistant materials (e.g., silicone rubber, expanded PTFE) to maintain flexibility at -200°C to -50°C. 

Use Case: Cryogenic applications (LNG storage, liquid nitrogen pipelines).

 Summary of Key Selection Factors  

To choose the right PTFE envelope gasket, consider: 

1. Medium Properties: Corrosiveness (dictates PTFE grade and core material). 

2. Operating Conditions: Temperature (graphite core for high temp; silicone for low temp) and pressure (reinforced envelope for high pressure). 

3. Flange Type: Full-face vs. ring-type, standard vs. custom shape. 

4. Industry Standards: FDA, ASME, or ISO compliance (for regulated sectors like food/pharma). 

By aligning these factors with the classifications above, you can ensure optimal sealing performance and long service life.

Detailed Introduction to CIPP Type Double-Stage Single-Liner Metal Seal

1. Core Design and Performance Advantages of the Product

The CIPP Type Double-Stage Single-Liner Metal Seal has become a preferred sealing solution for extreme environments, thanks to its double-stage multi-layer metal composite structure. This structure fundamentally ensures the reliability and effectiveness of the seal under harsh conditions such as high temperature, ultra-high vacuum, and high-energy particle beam radiation, providing stable sealing support for high-demand industrial scenarios.

Its innovative proprietary knife-edge design is a major highlight. It not only accurately compensates for deviations in flange flatness, significantly improving installation convenience and ensuring a secure fit between the seal and the flange but also enhances sealing performance while simplifying the installation process. This makes the overall sealing operation more efficient and reliable, effectively reducing construction difficulty and time costs.

2. Groundbreaking Performance Compared with Traditional Seals

In terms of requirements for flange surface roughness, traditional seals usually require the flange surface roughness (Ra) to be controlled between 0.2-0.4, which imposes extremely high demands on flange machining accuracy. However, the CIPP Type Double-Stage Single-Liner Metal Seal launched by Sonkit breaks this limitation. Even if the flange surface Ra value is as high as 0.8-1.6, it can still achieve effective sealing. This greatly reduces the strict requirements for flange machining and lowers the early-stage machining costs of equipment.

At the same time, the knife-edge design of this seal also significantly reduces the demand for bolt preload. This advantage not only reduces the load on the bolts, extending their service life but also lowers the risk of seal failure caused by improper preload control during installation, further improving the stability of the sealing system.

In terms of leakage rate control, professional test verification shows that the leakage rate of the system using Sonkit's CIPP Type Double-Stage Single-Liner Metal Seal can be reduced to 1E-11 mbarl/s. This value far exceeds the original design requirement of 1E-10 mbarl/s, representing a qualitative leap in sealing performance and providing strong technical support for scenarios with high sealing requirements.

3. Typical Application Scenarios

With its outstanding performance, the CIPP Type Double-Stage Single-Liner Metal Seal is widely used in high-end fields with extremely strict sealing requirements, including:

1.       Fusion Reactors: As a key sealing component for fusion reactions, it needs to maintain sealing integrity under extreme working conditions to ensure the safe and stable operation of the reactor. The double-stage multi-layer structure and low leakage rate characteristics of this seal perfectly meet its requirements.

2.       Tokamak Devices: Tokamak devices have complex structures and require highly specialized and precise sealing solutions. This seal can adapt to their complex design while meeting special needs such as plasma confinement and neutron radiation resistance.

3.       Ultra-High Vacuum Applications: In ultra-high vacuum environments, seals need to maintain excellent sealing performance for a long time. The ultra-high vacuum adaptability of this product makes it an ideal choice for such applications.

4.       Laser and Radio Frequency Guidance Systems: These systems have strict requirements for the reliability and stability of seals. This seal can ensure that the system is not disturbed by the external environment during operation, safeguarding guidance accuracy and system performance.

4. Adaptation to Core Performance Requirements in Application Scenarios

1.       Adaptation to Extreme Operating Temperatures: The seal assembly can always maintain structural and sealing integrity within a wide temperature range of -50°C to 350°C. Whether it is material stability in low-temperature environments or deformation resistance in high-temperature environments, it can meet the usage requirements of extreme temperature scenarios.

2.       Guarantee for Plasma Confinement: In scenarios involving plasma confinement such as Tokamak devices, the seal can operate reliably in strong magnetic fields, effectively blocking external interference, ensuring plasma confinement effects, and providing a stable sealing environment for relevant experiments and production processes.

3.       Neutron Radiation Resistance: For scenarios such as fusion reactors that need to withstand neutron radiation, the sealing system can be exposed to neutron radiation environments for a long time without a decline in sealing performance or leakage caused by radiation, ensuring the long-term safe operation of equipment.

4.       Adaptation to Ultra-High Vacuum Environments: In ultra-high vacuum application scenarios, the seal has excellent vacuum retention capability and can maintain stable sealing performance in ultra-high vacuum conditions for a long time, avoiding the impact of seal failure on the vacuum environment.

5.       Adaptability to Complex Structures: Facing equipment with complex structures such as Tokamak devices, this seal, relying on its highly specialized design and precise manufacturing process, can perfectly adapt to the complex structure of the equipment, ensuring reliable sealing in complex installation environments.

A Tri-Clamp Gasket, also known as a tri-lobe gasket or sanitary gasket, is a type of sealing gasket specifically designed for sanitary connections. Below is a detailed introduction to it:

- **Structural Design**: A Tri-Clamp Gasket is typically used in conjunction with clamp fittings. Its assembly consists of two clamps, one gasket, and two pipe fittings. The gasket is placed between the connecting surfaces of the two pipe fittings, and the clamping force of the clamps compresses the gasket, thereby forming a tight, leak-free sealed connection.

- **Material Types**:

    - **EPDM (Ethylene Propylene Diene Monomer)**: It has an operating temperature range of -20°F to 300°F (approximately -29°C to 149°C). It offers excellent high-temperature resistance and good tolerance to animal and vegetable oils, ozone, steam, water, and oxygenated solvents. It is suitable for applications involving CIP (Clean-in-Place) disinfectants like Oxonia and ozonated water.

    - **FKM/Viton (Fluorocarbon Rubber)**: Its operating temperature range is -30°F to 400°F (approximately -34°C to 204°C). It has higher chemical resistance than most elastomers and excellent compatibility with strong acids. However, it is not recommended for continuous use in SIP (Sterilize-in-Place) procedures.

    - **PTFE/Teflon (Polytetrafluoroethylene)**: With an operating temperature range of -100°F to 500°F (approximately -73°C to 260°C), it boasts extremely strong chemical resistance. Nevertheless, it is not advisable for use in scenarios with frequent large temperature fluctuations, as it lacks memory and may experience a "cold flow" phenomenon.

    - **Silicone Rubber**: Its operating temperature range is -40°F to 450°F (approximately -40°C to 232°C). It exhibits chemical resistance to various common chemicals, including acids, alkalis, and steam, but has only average tolerance to oils.

- **Application Fields**: Tri-Clamp Gaskets are widely used in industries with extremely high sanitary requirements, such as the food, dairy, beverage, biotechnology, and pharmaceutical industries. They are used to seal clamp connections in sanitary piping systems, ensuring that the connections between pipes, valves, pumps, and other process equipment are sanitary, preventing product contamination, and guaranteeing product quality and safety.

- **Performance Advantages**:

    - **Good Sanitary Performance**: It has a smooth, non-porous surface without layered grooves or protrusions, which makes it difficult for bacteria to grow and dirt to accumulate. It complies with relevant sanitary standards and certifications such as FDA and USP Class VI.

    - **Reliable Sealing Performance**: Under the clamping force of the clamps, it can form an excellent sealing effect, effectively preventing the leakage of liquids or gases and ensuring the normal operation of the system.

    - **Easy Installation**: No special tools are required; installation and disassembly can be quickly completed using clamps, facilitating the maintenance and cleaning of equipment.