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Artifact: Check Valve, Helium, Reaction Control, Apollo Command and Service Modules, Block II

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Identifier: A20120043
Artifact Category: Rocket Propulsion Systems
Period of Employment: October 11 1968 to July 24 1975
Manufacturer: Accessories Products Corp (APCO)
NASA Contract Number: NAS9-150
Spacecraft/Launch Systems: Apollo Command Module,Apollo Service Module

Aluminum, Stainless Steel

Dimensions: 4.75 x 2.25 x 3 (Inches)
Weight: .5 Pounds (estimated)
Flight Vehicle System or Component: Reaction / Reentry Control (RCS),Propellant Pressurization
Program: Apollo
Flown Status: Unflown

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.

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