Abstract:
The increasing adoption of cryogenic technologies—driven by liquefied hydrogen as an energy vector, helium for superconducting systems, and advanced processes using neon, nitrogen, and air—demands new valve solutions capable of meeting stringent thermal, mechanical, and efficiency requirements. As these applications expand across energy, fusion research, semiconductor manufacturing, chemistry, and high?performance industrial environments, valve manufacturers face the challenge of delivering systems that guarantee reliability, tightness, thermal performance, and precise control under extreme operating conditions.
This poster presents AMPO POYAM VALVES’ latest developments in cryogenic control valve design, with a special focus on electrically actuated solutions suitable for liquid hydrogen and liquid helium service. A central element of this innovation is AMPO’s new electric actuation platform, based on stepper?motor technology with integrated electronic fail?safe capability at scale.
The actuator concept delivers precise and repeatable positioning, low energy consumption, and robust safety functions while eliminating the need for pneumatic infrastructures—overcoming the inherent 6–15% efficiency limitations of conventional pneumatic systems identified in the EnEffAH study. The platform covers valve sizes up to DN85 and includes qualification assessment for special environments such as ATEX, enabling deployment across a wide variety of cryogenic systems.
In cryogenic service, thermal transients induce non?uniform contractions across the valve body, stem, and sealing components, leading to variations in the effective closure position. These effects are especially pronounced in liquid hydrogen and helium applications, where rapid cooldowns and steep thermal gradients can generate measurable deviations in shut?off alignment. To address this phenomenon, the proposed electrically actuated system integrates a dedicated control module capable of continuously monitoring actuator torque, step count deviations, and dynamic position feedback to detect early signs of thermally driven mechanical drift.
The control module applies an adaptive compensation algorithm that recalibrates the nominal closing position based on real?time performance data and predefined thermal?mechanical models of the valve assembly. By correlating actuator load profiles with the expected contraction behaviour of internal components, the system can execute micro?adjustments—typically within a sub?degree or sub?step resolution—ensuring stable sealing performance throughout all stages of cooldown and steady?state operation. This approach minimizes cumulative positional errors that, in traditional actuating systems, often lead to premature wear, increased leakage risk, or the need for frequent manual recalibration.
The plug and play solution require less interaction at commissioning stage and its compact dimensions enables more competitive and efficient solutions at system  level within high?performance cryogenic infrastructures. 
 
The proposed concept offers a compact, energy?efficient, and scalable alternative to traditional actuator technologies. By integrating advanced electric actuation with a modern cryogenic valve architecture, AMPO delivers a solution that enhances system efficiency, reduces CAPEX and OPEX, and supports the transition toward next?generation, high?performance cryogenic infrastructures.