LM Descent Engine shut-off valve assembly for the fuel side, measuring approximately 6 x 6.5 x 7.75. Engraved on the top, “MIR 43625,” with parts numbers on front, “1700571,” and side, “SK403987–4–1, S/N 575.” In fine condition. This housing comprised the external structure of the quad redundant ball operated shutoff valves that regulated propellant flow from the Lunar Module’s storage tanks into the Lunar Module Descent Engine (LMDE). The valves were commanded open and shut in conjunction with the LMDE flow control valve and variable pintle injector for throttle control and engine shutdown.
Terms and abbreviations used in our descriptions.