A Reaction Control System (RCS) Helium Check Valve assembly manufactured by Accessory Products Corporation (APCO) for the Apollo Command Module and Service Module (Service Propulsion System) Reaction Control System (RCS) Propellant Pressurization Section under NASA contract NAS9-150. Produced circa 1964, two check valve assemblies, one for oxidizer and one for fuel, permit helium flow to the tanks and prevent propellant or propellant vapor flow into the pressurization system if seepage or failure occurs in the propellant tank bladders.
When I acquired the artifact, it was still in its packaging. I have removed the item for display.
Thanks to Scott Schneeweis for the technical description of this artifact.
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