Type of Document	Thesis
Author	Gleaton, Anthony James
Author's Email Address	ajg5099@fsu.edu
URN	etd-07122004-110104
Title	Design, Analysis, and Testing of a Low Pressure Cryogenic Valve
Degree	Master of Science
Department	Mechanical Engineering, Department of
Advisory Committee	Advisor Name Title Cesar Luongo Committee Chair David Cartes Committee Member Steven Van Sciver Committee Member
Keywords	CAPS Modeling Nitrogen Vapor Testing Test Analysis Fluid Model Vent Valve SMES Cryogenic Pressure Low Superconducting Magnetic Energy Storage Relief
Date of Defense	2004-07-02
Availability	unrestricted
Abstract The design of a unique liquid nitrogen pumping station requires a unique pressure relief valve. This new relief valve must operate at low pressure differentials, work effectively at low cryogenic temperatures, and release a wide range of nitrogen vapor mass flow rates. A floating valve design was selected, one that requires no springs and relieves pressure based upon the weight of the actuating piston. Before testing began, an analytical flow model of pressure loss through the valve was completed and valve set pressures were calculated. The purpose of the valve testing was to both prove the concept of the valve and verify results from the modeling. Experimental results revealed accurate agreement between the model and the test for low mass flow rates. However, at high mass flow rates, the model and test results did not agree, as the effects of vortices above the valve were not included within the model. While the basic concept and operation of the floating valve were established, further and more precise testing are required to develop a complete understanding of the valve’s operation.
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