In this tech talk, Steven had the pleasure of discussing about the Ultra High Pressure Valves for hydrogen applications with Markus Wirth, Product Manager at Bürkert Fluid Control System.
Learn about Ultra High Pressure Valves for Hydrogen Applications
Steven Oji and Markus Wirth discuss the complexities of designing and operating ultra-high-pressure valves. The video showcases standard low-pressure valves with ultra-high-pressure variants, emphasizing the mechanical and material changes required to handle pressures exceeding 350 bar, and up to and beyond 1000 bar. Wirth details the construction differences, including the use of machined materials and advanced sealing techniques like PCTFE and metal-to-metal seals, which are crucial for maintaining tightness at extreme pressures. Marcus explains how these valves function, focusing on the role of magnetic circuits and servo-assisted mechanisms in regulating gas flow. Safety is paramount, with valves designed to withstand up to twice their working pressure and rigorously tested according to European standards.
This valve construction notes that while low-pressure valves use deep-drawn tubes from sheet material, high-pressure valves are machined from solid bar material to withstand the increased stress. For ultra-high pressures, the components are often screwed together rather than welded to ensure integrity under extreme conditions.
The working principles of these valves focus on the solenoid mechanism that controls gas flow. Marcus explains that at high pressures, the valve's design must account for significant forces, requiring precise engineering, such as the use of PTFE or even metal-to-metal seals, which depend on the smoothness of the metal surfaces to prevent leakage.
Safety is a critical concern, especially with gases like hydrogen. Wirth details the rigorous testing and certification processes, including pressure testing at 1.5 times the operating pressure and compliance with stringent European Union directives. He also highlights the importance of temperature resistance, noting that the valves can function in extreme conditions as low as minus 40 °C, which is essential for installations in harsh environments like refueling stations in Scandinavia.
If you like the video, please also subscribe to our new Hyfindr Youtube Channel. We launched Hyfindr Tech Talks in January - a new format that is specifically designed for engineers who are interesed in the hydrogen economy!
Steven is a fuel cell system designer and he will deep-dive into the technology that makes the hydrogen economy work with real experts. We hope you will like the new format.