Cryogenic Solenoid Valve Actuators
Material selection and design considerations for extreme cold applications
1. Cryogenic Environment Challenges
Material Brittleness
Carbon steel loses ductility (-40°C), PVC becomes brittle (-60°C)
Thermal Contraction
Stainless steel shrinks 0.2% at -196°C, risking seal leaks
2. Material Compatibility
| Material | Temperature Limit | Application |
|---|---|---|
| 316L Stainless Steel | -269°C | Body components |
| PTFE Seals | -200°C | Dynamic seals |
3. Design Adaptations
Critical Design Features
Extended bonnets (200-300mm insulation)
Dry nitrogen purge systems
Krytox GPL-205 grease (-73°C to 204°C)
4. Industry Standards
API 6A/6D: -46°C to -196°C service
ISO 15631: Cryogenic valve testing
ASME B16.34: Pressure-temperature ratings
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