Method and apparatus for determining spring preloading in a flui

Details Method and apparatus for determining spring preloading in a flui Method and apparatus for determining spring preloading in a flui

1985-07-02

1986-08-26

Goldberg, Howard N.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29157C, 29407, 29705, 29714, 29720, 73432R, B21D 5300, B23Q 1500, B23P 2100, G01L 2500

Patent

active

046074210

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.

REFERENCES:
patent: 2970467 (1961-02-01), Pettibone
patent: 3107417 (1963-10-01), Jaquish et al.
patent: 3123903 (1964-03-01), Flanagan
patent: 3949456 (1976-04-01), Oberthur
patent: 4481699 (1984-11-01), Knapp et al.
patent: 4558498 (1985-12-01), Satoh

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