Cross Section and Inside Diameter "I.D." Calculation |
Dynamic Cross Section |
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Static Cross Section |
- The following refers to a dynamic application, see gland |
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- The following refers to a static application, see gland design |
design section for listings |
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section for listings |
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1. List the bore diameter |
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1. List the gland depth and multiply by the minimum and |
2. List the piston groove diameter |
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maximum squeeze requirements ( see the gland design |
3. Subtract the groove diameter from the bore diameter, |
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section for listings). |
and divide the difference by two. |
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4. Refer to corresponding table (see gland design section |
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Static I.D. Calculation |
for listings) to establish minimum and maximum squeeze |
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List the diameter of the part that the o-ring that will be |
requirements. |
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stretched over during installation and reduce this figure by 1% |
5. Multiply the figure from step three, by the minimum |
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to 5% therefore reducing the o-rings I.D. to allow for stretch, |
and maximum squeeze requirements obtained in step |
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similar to the dynamic I.D. calculation. Then look up the o-ring |
four. The two figures obtained represent the minimum |
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in the gland design section by I.D. and corresponding |
and maximum o-ring cross section diameters, for the |
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cross section. |
particular application. |
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Dynamic I. D. Calculation |
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The inside surface of the o-ring will be resting on the |
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bottom of the piston groove. To have a complete seal the |
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o-rings I. d. must be smaller than the piston groove diameter |
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(see above). The o-rings I. d. therefore will be slightly |
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stretched in the application. The stretch should be a minimum |
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of 1-2% but not exceeded 5%. The following formula |
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calculates the o-ring I. d. |
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O-Ring I. d. = Groove Diameter / % of stretch desired (1% - 5%) |
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