14 October 1996 Remote-controlled stepper-motor-activated cryogenic valve: design, development, and testing
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The successful operation of many space-based systems requires reliable cryogen handling capabilities. Propulsion systems and remote sensor cooling systems that must contain and transfer cryogenic fluids must do so repeatedly and reliably over an extended system lifetime. For maximum utility, these space-based cryogen handling systems must be capable of both programmed control and remote-site control. One critical component of a cryogenic transfer system is a remote-controlled valve. The Space Dynamics Laboratory at Utah State University has developed a stepper-motor- activated cryogenic valve for NASA/Goddard Space Flight Center under contract NASA5-29422. This valve is flight- certified and has proven to be very reliable and rugged. Helium leak rates of less than 1 X 10-8 sccs at 4 degrees K are consistently obtained after 3000 open-and- close cycles of the valve. This report describes the unique design of the valve and the special material used for the seat and stem to achieve these results.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ralph H. Haycock, "Remote-controlled stepper-motor-activated cryogenic valve: design, development, and testing", Proc. SPIE 2814, Cryogenic Optical Systems and Instruments VII, (14 October 1996); doi: 10.1117/12.254139; https://doi.org/10.1117/12.254139

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