How to choose a high-pressure ball valve suitable for supercritical fluids?

1. Fluid properties: The characteristics of supercritical fluids include high temperature, high pressure, high density, etc., so it is important to choose a high-pressure ball valve suitable for these conditions. For example, in the liquefied natural gas (LNG) industry, supercritical methane requires the use of special materials that can withstand high pressures and low temperatures, such as A351 CF8M stainless steel or other high-alloy steels.

2. Working conditions: Working conditions are the key factor in selecting high-pressure ball valves. Considering the high-pressure and high-temperature characteristics of supercritical fluids, such as in supercritical carbon dioxide (sCO2) energy systems, high-pressure ball valves need to be able to withstand conditions up to 700 degrees Celsius and more than 4000 psi, so it is a good choice to use high-temperature and high-pressure alloy steels such as Inconel or Hastelloy. a common choice.

3. Valve material: The selection of valve material is directly related to the corrosion resistance and mechanical properties of the valve. For systems that handle highly corrosive supercritical fluids, such as in the chemical industry, high-pressure ball valves are usually made of alloy materials that are resistant to acid and alkali corrosion, such as 316 stainless steel.

4. Sealing performance: In the high-pressure environment of supercritical fluids, the sealing performance of the valve is crucial. Metal-sealed ball valves are common due to their high pressure resistance and high temperature resistance. For example, for liquid ammonia applications, ball valves made of special alloys often feature metal-to-metal sealing designs to ensure efficient sealing.

5. Valve types: Different types of high-pressure ball valves are suitable for different fluid control needs. In supercritical fluid applications, especially in nuclear power plants, fixed ball valves are often used to maintain highly precise fluid control, ensuring system safety and reliability.

6. Feedback and control system: In some highly automated systems, high-pressure ball valves need to be integrated with feedback and control systems to achieve precise fluid control. For example, in chemical processes, high-pressure ball valves equipped with electric actuators and feedback systems are required to ensure system controllability and automation.

7. Standards and Certifications: Choosing a high-pressure ball valve that meets international standards and certifications is the key to ensuring its quality and safety. For example, API 6D is an international standard widely used in the valve manufacturing industry to ensure consistency in valve design, manufacturing and testing.

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