The Série 75 HD is a direct-operated 3/2-way solenoid valve from ALPHA AUTOMATISMES Sarl, a French pneumatics manufacturer with over 33 years of experience in industrial automation components. Configured as normally closed (NC), it is specifically rated for hydrogen gas — a demanding application that requires material selection and seal design compatible with H₂ permeation and embrittlement risks.

What distinguishes a hydrogen-rated solenoid valve from a standard pneumatic valve?

Hydrogen service imposes stricter requirements than compressed air. Seal materials must resist H₂ permeation; body and internal components must avoid embrittlement-prone alloys; and leak-tightness standards are higher due to hydrogen's wide flammability range (4–75% in air). Valves like the Série 75 HD are purpose-built with these constraints in mind, typically using compatible elastomers and certified body materials suitable for hydrogen handling in laboratory, process, and energy applications.