Airlock Door Assembly
Dual-Seal Pressure Door with Emergency Close
The airlock door assembly is a 17-4PH stainless steel pressure door providing entry and exit for habitat airlocks while maintaining atmospheric containment. Fitted with dual silicone O-ring seals and an intermediate leak-check port, the assembly mechanically latches to seal against pressure differentials from both sides, while a spring-loaded quick-close mechanism enables rapid closure during depressurization. On the lunar surface, seal materials must resist degradation from abrasive dust tracked in during transit. Additionally, titanium hinge pins and mechanical latches must withstand decades of cycling in hard vacuum without binding under structural thermal distortion.
Pressure-rated doors with dual redundant seals for airlock entry and exit
Purpose
Pressure-rated doors with dual redundant seals for airlock entry and exit
Context
Child of L2-STR-LOCK
Principles
- ▸Dual O-ring seal with leak check port between seals verifies seal integrity before cycling
- ▸Mechanically latched in closed position to maintain seal under pressure differential
- ▸Emergency quick-close mechanism (spring-loaded) enables rapid closure on depressurization
- ▸Door hinge design accommodates thermal distortion without binding
Typical implementations
- ▸ISS Quest Joint Airlock hatch design
- ▸Submarine pressure hull door mechanisms
- ▸Nuclear containment airlock door standards
Lunar considerations
- ▸Seal materials must resist dust contamination from robot transit
- ▸Hinge and latch mechanism must function reliably after decades of cycling in vacuum
- ▸Door must seal from both sides for redundant closure capability
Specifications
Functional
| primary function | Pressure-rated doors with dual redundant seals for airlock entry and exit |
Physical
| materials | 17-4PH stainless steel door, Silicone O-ring seals, Titanium hinge pins |
Interfaces
Provides
- Pressure-rated closure for airlock transitions
Requires
- Dust cleaning before door cycling
Cite this entry
Lunar Ark Codex. "Airlock Door Assembly" (L3-STR-LOCK-DOOR). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-STR-LOCK-DOOR
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.