www.hpmag.co.uk HYDRAULICS & PNEUMATICS September 2025 29 valve is also tested to a leakage rate of 1x 10^-4 mbar l/s with helium. The advantage of design assistance To maintain the desired hydrogen concentration at the stack inlet, a fast-opening purge valve with high repeatability quickly flushes diluted gas. Direct-acting plunger valves are specified as they achieve the required level of precision and repeatability at low pressure. To accurately control purge volume, rapid switching times are required, and the industry benchmark includes an opening rate between 10 and 20 ms. These valves are also required to complete a high number of cycles, so reliability and long life are key. To discharge deionised water from the system, a direct-acting plunger valve also operates as a drain valve. While this operation doesn’t require the same level of precision, reliability and long life are also key, and here, the relative simplicity of a plunger valve design is an advantage. The Bürkert Type 6030 direct-acting plunger valve, according to Brennan, builds on this with a stainless-steel body and EPDM seals for hydrogen-specific use, combined with push-in manifold housings and IP6K9K solenoid coils. Selecting the right solenoid valve is vital for the development of hydrogen fuel cells if they are to achieve the necessary safety and reliability for mobile applications. This makes valve design and materials specification key. Involving engineering expertise in hydrogen flow control is an effective way to achieve this goal while also ensuring the system achieves the optimum levels of durability, performance and efficiency. For further information please visit: http://www.burkert.co.uk www.uschydraulics.com • 01555 772 474 • sales@uscltd.co.uk Scotland’s Independent Valve Stockist Pumps | Motors | Valves | Filtration The Type 6030 is ideal for flushing and drainage of fuel cell systems as well as other hydrogen applications.
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