United Technologies Corporation

Stephanie A Roberts

Antonio B Caruolo

Thomas G Zemek

John Spearen

James K Dunn

Required preloading of a valve closing spring (80) in a pressure operated, fluid handling device (10) is determined by mechanically precompressing the spring, applying operating pressure to the device and relieving the bias on the spring until the operating pressure opens the valve, the thickness of a shim (75) for effecting such preloading being equal to the difference between the change in spring length due to the precompression thereof and the change in spring length due to relief of the precompression prior to spring opening.

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Columbia, SC, United States of America

Stephanie A Roberts