This book discusses the performance of check valves with springs and seats made of Yttria stabilized zirconia. Standard check valves have components in them, such as metallic springs and elastomeric seats, which have certain limitations with respect to temperature. The springs were of 10, 12, 14 and 16 turns per inch (TPI). This helped us study the performance of the springs based on the coil thickness and number of turns per inch.The tests included deflection and cracking pressure measurements at ambient and elevated temperatures. The experimental data was correlated to a metal spring equation with certain modifications to compare the performance of the ceramic check valves. The work was carried out at University of Alabama Huntsville under the able guidance of Dr James E Smith, Jr and support from Parker and Hannifin Corporation, Valves Division, Jacksonville, Alabama

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