AN ALCOA FOR NASA BURST DISK VALVE FROM AN APOLLO COMMAND MO...

Hammer

£80

AN ALCOA FOR NASA BURST DISK VALVE FROM AN APOLLO COMMAND MODULE, printed NASA mark with part number 600027F-A9 moulded into the casing, designed to counter excess pressure in the fuel lines (On the Apollo moon bound CSMs, the propellants used were very flammable and were under high pressure in the propellant lines (tubes) that ran from storage tanks to rocket engines or guidance thrusters in the CSM, no gravity in space (weightlessness) to pull propellant through flow lines, so high pressure gases - usually helium - used to push the propellants from storage tanks down the flow lines to rocket engines, the pressure of propellants was measured at various points along the flow propellant lines, but, as a major safety backup feature these BURST DISK VALVES were added at many points along each flow line, the BURST DISK VALVES essentially consisted of a taught diaphragm across the flow line, if the propellant flow pressure was ABOVE operational design limits the diaphragm was designed to 'burst' (hence name) to relieve pressure hopefully avoiding catastrophic Apollo spacecraft explosions or failure)