Method and apparatus for determining spring preloading in a fluid handling device
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United States of America Patent
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-
Aug 26, 1986
Grant Date -
N/A
app pub date -
Jul 2, 1985
filing date -
Jul 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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