Skip to main content
Go to accessibility notice

    Description

    Apollo Program Hardware: Reaction Control System Helium Check Valve Assembly for Command/ Lunar Modules. Manufactured by Accessory Products Company (APCO). This 4.75" x 2.125" x 2.375" device is a double helium pressurant check valve: one side for oxidizer (nitrogen tetroxide) and one side for fuel (hydrazine). Helium is the pressurizing gas used in these small rocket engines used to correct the attitude of the space craft. This valve prevented the propellants or their vapors from flowing back into the helium pressurant system should there be a failure of one of the propellant tank bladders or a sudden depressurization of the helium pressurant system. This part has both the Apollo Command module master contract number NAS 9-150 and also a Grumman Aircraft Engineering Company (GAEC) SCO number LSC 310-306-3. Grumman was the master contractor of the Apollo Lunar Module. Four protective caps are included for the studs (not shown in images). Displays nicely. Excellent.

    Auction Info

    Auction Dates
    November, 2013
    1st Friday
    Bids + Registered Phone Bidders: 7
    Lot Tracking Activity: N/A
    Page Views: 986

    Buyer's Premium per Lot:
    25% on the first $100,000 (minimum $14), plus 20% of any amount between $100,000 and $1,000,000, plus 12% of any amount over $1,000,000 per lot.

    Sold for: Sign-in or Join (free & quick)

    Heritage membership

    Join Now - It's Free

    VIEW BENEFITS
    1. Past Auction Values (prices, photos, full descriptions, etc.)
    2. Bid online
    3. Free Collector newsletter
    4. Want List with instant e-mail notifications
    5. Reduced auction commissions when you resell your
      winnings 
    Consign now
    • Cash Advances
    • More Bidders
    • Trusted Experts
    • Over 200,000 Satisfied Consignors Since 1976
    Only 32 days left to consign to the 2020 May 22 Space Exploration Signature Auction - Dallas!

    Learn about consigning with us

    This was my first time dealing with an auction house, and I am 100% completely impressed with Heritage. There is not an aspect of this process that I have a critique for.
    Darryl S.,
    Stuart, FL
    View More Testimonials

    HA.com receives more traffic than any other auction house website. (Source: Similarweb.com)

    Video tutorial

    Getting the most out of search

    Recent auctions

    2020 February 22 - 23 Americana & Political Signature Auction - Dallas
    2020 February 22 - 23 Americana & Political Signature Auction - Dallas
    REALIZED SO FAR $2,361,883