Check valve

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JIS20K flange swing check valve is manufactured according to Japanese JIS standards. The main materials are stainless steel SCS13/SCS14 and carbon steel SCPH2. The pressure rating of the valve is represented by K. It is a unidirectional flow control device designed for high-pressure pipeline conditions, with technical characteristics optimized based on Japanese Industrial Standards (JIS B 2073/B 2220), suitable for fluid systems in petrochemical, energy transportation and other fields. The following technical explanations are provided from the dimensions of structure, materials, and functionality:

‌1. 结构与工艺设计‌

• ‌高压适应性阀体‌：
  采用整体铸造或锻造工艺成型，阀体壁厚较常规型号提升20%-25%，内部流道经流体力学模拟优化，减少紊流并降低压损。法兰接口符合JIS 20K标准，密封面可选突面（RF）或环槽面（RTJ），法兰厚度与螺栓孔位按公称压力匹配设计（如DN150法兰配置8孔×φ22mm，厚度38mm）。

• ‌复合密封系统‌：
  主密封面采用金属硬密封（阀瓣堆焊钴基合金层，厚度1.5-2mm，耐温≥800℃），配合弹性石墨环辅助密封，实现双向压力阻断。摇臂轴系采用硬化不锈钢材质，表面经抛光处理（粗糙度Ra≤0.8μm），降低摩擦阻力并延长启闭寿命。

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• ‌主体材料‌：

  • ‌铸钢型号‌The valve body material is SCPH21 (equivalent to ASTM A216 WCB), suitable for temperatures ranging from -29 ℃ to 425 ℃, and suitable for steam and non corrosive oil and gas media.
  • ‌耐蚀型号‌The valve body is made of duplex stainless steel (such as SUS329J1 or SUS31803), with a chloride ion tolerance concentration of ≥ 5000ppm, suitable for seawater and acidic media environments.

• ‌关键组件强化‌：

  • ‌阀瓣销轴‌Adopting silicon carbide ceramic lining, supporting non lubricated operation;
  • ‌密封环‌Flexible graphite and metal skeleton composite structure, suitable for temperature variation conditions from -200 ℃ to 600 ℃.

‌3. 功能参数与应用‌

• ‌压力-温度关系‌：
  常温（38℃）下允许工作压力2.0MPa，温度升至400℃时，铸钢材质阀体允许压力降至1.2MPa。壳体强度试验压力为3.0MPa，密封试验压力2.2MPa，满足高压系统安全需求。

• ‌典型应用场景‌：

  • High pressure hydrogenation pipeline of refining unit (medium containing H ₂, pressure ≤ 15MPa);
  • Main steam pipeline for thermal power generation (temperature ≤ 540 ℃, requiring heat-resistant steel material);
  • Liquefied natural gas (LNG) low-temperature pump outlet (-162 ℃ working condition, material subjected to cryogenic treatment).

• ‌定制化扩展功能‌：
  可选配液压阻尼缓闭装置，调节阀瓣关闭速度（0.5-10秒），抑制水击压力；支持阀盖螺栓连接式结构（Bolted Bonnet），便于现场维护。

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• The installation position of the swing check valve is not limited. Usually installed in horizontal pipelines, but it can also be installed in vertical pipelines. Or tilt the pipeline The disc swing check valve rotates around the shaft, and its fluid resistance is generally smaller than that of the lift check valve, making it suitable for larger diameter applications.

• Flange connection JIS 20K swing check valve

• Body Material: SCPH2, SCS13, SCS14
  核动力源：50A-500A
  设计标准：JIS B2071 ,ASME B16.34
  面对面：JIS B2002
  法兰标准：JIS B2220
  检验测试：JIS B2003
  类型：法兰阀盖

‌技术总结‌This valve balances high-pressure sealing, temperature resistance, and medium compatibility requirements through structural reinforcement, material adaptation, and process control. When selecting, it is necessary to adapt according to the characteristics of the medium, the working temperature and pressure curve, and the installation direction (horizontal/vertical). Special working conditions can be customized and adjusted according to the material or sealing form.