Space Rocket History #335 – Impacts of Soyuz 11 on Future Soyuz, Salyut-1 & Apollo

It was decided that henceforth, cosmonauts would wear pressure suits for launch and the return to Earth. Also, a system was installed to automatically pump air into the descent module in the event of decompression.  Additionally, the ventilation valves were modified so a premature opening would cause them to re-close automatically.  Of course these changes meant the spacecraft could only accommodate two cosmonauts.

Simplified Depiction of Ventilation Valve 2Ventilation Valve 1 with Manual Shutter OpenUpdated Soyuz 7K-T for 2 CosmonautsExcerpt from Apollo 8 Press KitApollo 15 Suit Wearing ScheduleExcerpt from Apollo 15 Flight Journal