United Technologies Corporation

Thomas G Zemek

Antonio B Caruolo

James K Dunn

Stephanie A Roberts

John Spearen

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.

Method and apparatus for determining spring preloading in a fluid

Pneumatic indexing of a shaped component (127) is attained by adjusting the position of the component until fluid passages (130) therein are aligned with supply and vent passages (100) and (110) in a pneumatic head (15). Such alignment causes the relief of supply passage pressure through the vent passages and a resulting retention of the shaped component in an indexed position thereof.

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Mansfield, CT, United States of America

Thomas G Zemek