액화수소 적용을 위한 스프링 이격형 압력 안전밸브의 실험적 성능평가 연구

초록

In this study, the cryogenic performance of spring-loaded direct-acting pressure safety valves (PSVs) for liquefied hydrogen applications was experimentally investigated. A modified PSV with a spring separation structure was proposed to reduce thermal exposure of the springs under cryogenic conditions. Cryogenic operation and tightness tests were conducted in accordance with KGS AA319 and EN 13648-1:2009standards using liquid nitrogen. The results show that conventional PSVs exhibited deviations in opening pressure beyond the allowable ±3% range due to spring freezing and stiffness variation during repeated cryogenic operation. In contrast, the proposed design maintained stable operating performance within the allowable tolerance. Although tightness performance improved by approximately 10%, neither configuration met the 90% tightness criterion, indicating that sealing performance was influenced by factors beyond spring stiffness. These findings demonstrate that the spring separation structure is effective in improving the operating reliability of PSVs in cryogenic environments.

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