Apollo Service Module RCS Helium Pressurization Solenoid Valve
Helium is supplied to the Reaction Control System propellant with the helium pressure used drive the propellant out of the bladders at the proper feed rate to the R-4D reaction control engines in the quads. The helium isolation valves between the helium tank and pressure regulators contain two solenoids: one solenoid is energized momentarily to […]
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